Black Box Modem 3600 Users Manual V3600 Bk

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2015-02-02

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3600
Modem User’s Guide

Trademarks
Any trademarks mentioned in this manual are acknowledged to be the
property of the trademark owners.

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Modem 3600

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1XPEHU5(1NUMBER:
(505)555-1313

The number was delivered
by the phone company

CALLERNUMBER:OUT OF
AREA

The number was not
available from the phone
company

CALLERNUMBER:PRIVATE

Delivery was blocked by
the caller

CALL FAILURENUMBER:
ERROR

The number was received
in error

If the telephone company provides Enhanced Caller ID, the caller's
name appears after the caller phone number.

Distinctive Ring

*DR

If the telephone company is providing distinctive ring service to the
local phone line, the Modem 3600 can report the type of ring to the
DTE.* The data communications software package must allow
distinctive ring.
*Caller ID and Distinctive Ring are compatible only with USA
standards.

Command

Operation

*DR=0

Disable Distinctive Ring

*DR=1

Enable Distinctive Ring

5-18

Modem 3600

AT Commands

When distinctive ring is enabled, one of the messages in Table 5-3
appears on the DTE instead of the regular RING message:

Table 5-3. Distinctive Ring Message s
The modem sends this
message...

If the Ring Was a:

RING A

Single ring (1 ring burst)

RING B

Double ring (2 ring bursts)

RING C

Triple ring (3 ring bursts)

Terminal Interface Commands
The EIA-232 interface connects the modem and DTE. Terminal
interface commands control the action of the modem and the terminal in
response to the signals being exchanged on the interface pins. Refer to
Table 2-1.

Data Carrier Detect &C
When using DCD to indicate a valid carrier, use the &C1 command.
Some terminals and other devices require DCD on in order to
communicate with the modem; if so, use the &C command.

Command
&C

Operation
DCD always on

&C1

DCD on when modem recognizes remote modem
carrier or, if enabled, when protocol negotiation is
complete.

&C2

DCD on except for 5 seconds after disconnect

&C3

DCD follows RTS on remote modem (simulated
switched carrier V.13).
Note
AT&C3 is used to simulate switched carrier operation.
Note
For simulated switched carrier operation &C3 must be
selected on both modems. Not available in the B103 and V.21
modulation modes.

Modem 3600

5-19

AT Commands

Data Set Ready &S
These commands control the DSR signal generated by the modem to
indicate that the modem is ready for operation. DSR must be on for
some terminals and devices to communicate with the modem.

Command

Operation

&S

DSR always on

&S1

DSR on when off hook in data mode

&S2

DSR off for 5 seconds after disconnect then returns
to on

&S3

DSR follows off hook (OH) signal

Data Terminal Ready &D
In data mode DTR may be used for modem control.

Command

Operation

&D

The modem ignores DTR.

&D1

The modem goes to command mode from data
mode when DTR goes from on to off.

&D2

Disconnects when DTR goes from on to off;
disables autoanswer while DTR is off.

&D3

Disconnects, recalls command mode, and resets the
modem to a stored configuration when DTR goes
from on to off.
In dial line mode the modem disconnects; in leased
line, the modem retrains.
Note
If DTR controls dialer is selected, selecting DTR active will
cause an autodial after an off-to-on transition of DTR.

5-20

Modem 3600

AT Commands

Serial Port Ring Indicator (Pin 22) \R
The \R commands determine how the ring indicate signal operates on
pin 22 of the EIA-232 DTE connector.

Command

Operation

\R

Causes ring indicate signal on pin 22 to turn on
(high) during each ring and remain on during the
call

\R1

Causes ring indicate signal on pin 22 to turn on
(high) during each ring and turn off (low) when the
call is answered

Request to Send / Clear to Send &R
When the modem is operating in nonbuffered mode (direct mode) or in
synchronous mode, &R enables the RTS-to-CTS delay determined by
the value in S26. &R1 forces CTS high and the modem ignores RTS
(default). With &R2 selected, CTS goes high when carrier is detected.
&R9 forces CTS to follow the state of RTS without delay.

Command

Operation

&R

Enables RTS-to-CTS delay

&R1

CTS forced on

&R2

CTS follows DCD

&R9

CTS equals RTS
Note
RTS/CTS delay is not valid in buffered mode or with error
control enabled.
Note
With &R2 selected, XON/XOFF is the only valid method of
flow control and &C and &C1 are the only valid carrier detect
options.

Modem 3600

5-21

AT Commands

DTE Controlled Fallback Rate (Pin 23) *FB
Pin 23 of the EIA-232 DTE connector provides signal input to the
modem for DTE fallback. If the modem is not using DTE fallback, set
this option to ignore pin 23. To cause the modem to act on high/low
levels of pin 23, enable this option. Negative level forces a higher rate
for primary data rate; positive forces a lower rate providing a fallback
rate.

Command
*FB

Operation
Ignore pin 23

*FB1

Transition on pin 23 changes speed

General Commands
This series of commands controls various standard options that in most
cases apply to any mode of operation.

Changing from Data Mode to Command Mode +++
To exit data mode and go to online command mode, press the escape
character three times (+ is the default). Pause for the length of time set
by register S12 (1 second is the default) before and after the +++ to
ensure the modem recognizes the escape command.
This sequence temporarily suspends data mode transmissions and
allows command mode operations without breaking or otherwise
disturbing the telephone line connection. The modem responds with OK
when it detects the escape code. Return to data mode by entering the O
command.
Note
The AT command set must be enabled.

Local Character Echo E
Type AT without a carriage return. If the screen shows AT character,
echo is correct. Proceed with other commands as desired.
If the screen shows AATT, enter the E command to correct the double
characters or disable character echo by the modem.

5-22

Modem 3600

AT Commands

If the screen shows no characters, enter the E1 command to turn modem
echo on or enable local echo on the terminal.

Command
E

Operation
Echo off

E1

Echo on

Online Character Echo F
In some lower speed modems the F command determines if characters
are echoed to the DTE from the modem when online. This function is
generally controlled by the communications software. The modem does
not support online character echo.

Hanging Up H, H1
To end a call, enter the H command. This tells the modem to disconnect
and go on hook. The modem must be in command mode to use this
command.
Enter the H1 command to take the modem off hook. The modem
automatically goes off hook when a dial command is keyed in.

Fast Disconnect H2, H3
The results of the H command can be modified by the H2 and H3
commands. H2 or H3 will not cause a hang up but will affect the method
of hanging up the next time the H command is issued. If H2 is entered,
the H command will hang up according to CCITTV.32 standards. If
operating in V.32 bis mode the H2 command could take several seconds.
If H3 (the fast command) is entered, the H command will hang up much
more rapidly at those speeds.

Command

Operation

H

The modem hangs up.

H1

Forces modem off hook

H2

Sets H command to normal hangup procedure (long
space, cleardown, protocol)

H3

Sets H command to fast hang up

Modem 3600

5-23

AT Commands

EPROM Check I
PC software packages may issue the I command to verify the modem
will support all commands needed by the software package. The modem
returns ASCII characters representing the model and revision level. To
request the checksum to be calculated on the EPROM, enter the I1
command. The modem returns four ASCII characters representing the
cyclic redundancy check (CRC) in hexadecimal form. Enter the I3
command to request the product version.

Command
I

Operation
Request product code

I1

Request EPROM checksum value

I3

Request product version

I4

Returns Motorola V.3600

I5

Last disconnect reason

Speaker Volume L
The L commands offer three volume levels.

Command

Operation

L, L1, L2

Speaker volume low

L3

Speaker volume high

Speaker Control M
The M commands enable or disable the speaker for monitoring purposes.

Command

Operation

M

Disables the speaker

M1

Disables the speaker while receiving a carrier signal

M2

Speaker always on

M3

Disables the speaker while dialing and after a
carrier is detected

5-24

Modem 3600

AT Commands

Return Online O
Use the O command when you are operating in the online command
mode and need to return to data mode. It returns the modem to the same
mode (originate or answer) that it was in before escaping to the (online)
command mode. Enter the O1 command to cause a retrain to occur
before going back to data mode.

Long Space Disconnect Y
One method of disconnecting two modems is called long space
disconnect. When any disconnect condition is detected by the local
modem, it will send 4 seconds of data space condition to the remote
modem before disconnecting. This signals the remote modem to
disconnect. The local modem will disconnect if it receives 1.6 or more
seconds of data space condition from a remote modem. If break
sequences of 1.6 or more seconds are to be sent, enter the Y command to
disable this feature and prevent unintentional disconnects.
Note
This option must be disabled if SDLC NRZI data is used.

Command

Operation

Y

Long space disconnect off

Y1

Long space disconnect on

V.22 bis Guard Tones &G
Guard tones are not used in the United States. If required where
operating the unit, select the appropriate guard tone.

Command
&G

No guard tone

Operation

&G1

550 Hz guard tone

&G2

1800 Hz guard tone

Asynchronous / Synchronous Mode Selection &M
The &M commands select synchronous or asynchronous operation and
synchronous dial method.

Modem 3600

5-25

AT Commands

Use register S30 to select NRZ/NRZI for data format if using SDLC.

Command Operation
&M

Async data/dialer mode (V.25 bis disabled)

&M1

Sync data mode / async dialer

&M2

Sync data mode / DTR dials if active

&M3

Sync data mode / manual dial

&M4

Sync data mode (ASCII) with V.25 bis BISYNC dialer

&M5

Sync data mode (NRZ) with V.25 bis SDLC dialer

&M6

Sync data mode with V.25 bis async dialer

&M7

Async data mode with V.25 bis async dialer

&M8

Sync data mode (EBCDIC) with V.25 bis BISYNC dialer

&M9

Sync data mode (EBCDIC, NRZ) with V.25 bis async
dialer

&M10

Sync data mode (ASCII, NRZI) with V.25 bis SDLC
dialer

&M11

Sync data mode (EBCDIC, NRZI) with V.25 bis SDLC
dialer

IMPORTANT: Synchronous DTE must be available to communicate
with the modem if the V.25 bis dialer is enabled.

Make / Break Dial Pulse Ratio &P
Use the &P command for the dial pulse to be on for 39% and off for
61% of one cycle. Use the &P1 command for the dial pulse to be on for
33% and off for 67% of one cycle.

Command
&P

Operation
39% : 61% US and Canada

&P1

33% : 67%

5-26

Modem 3600

AT Commands

Synchronous Transmit Clock Source &X
The &X commands select internal, external, or receive clock as the
transmit clock source.

Command

Operation

&X

Internal clock

&X1

External clock

&X2

Receive clock

V.34 Rate Selection Thresholds *TH
The *TH commands sets theV.34 rate selection thresholds. TheV.34
modulation dynamically selects the optimum bit rate to run, based on
line quality.

Command
*TH

Operation
Low V.34 threshold (10 - 6 BER)

*TH1

Medium V.34 threshold (10- 4 BER)

*TH2

High V.34 threshold (10- 2 BER)

V.34 Asymmetric Bit Rates *AS
The *AS command enables or disables the V.34 asymmetric bit rate
capability. This feature allows the modem to run different bit rates on
the receiver and transmitter.

Command
*AS

Operation
Disable V.34 asymmetric bit rates

*AS1

Enable V.34 asymmetric bit rates

Modulation *MM
The *MM command sets the current modulation type to use when
attempting to make a connection. Using this command automatically
selects the maximum DCE speed (%B) for the selected modulation.

Command

Operation

*MM

Automode (typically used on dial line)

*MM1

V.21

*MM2

B103

*MM3

Reserved

*MM4

B212A
Modem 3600

5-27

AT Commands

Command

Operation

*MM5

V.22 bis

*MM6

V.27 bis 4-wire leased only

*MM7

Reserved

*MM8

V.29 4-wire leased only

*MM9

Reserved

*MM10

V.33 4-wire leased only

*MM11

V.32 bis

*MM12

V.34

Maximum DCE Speed %B
The %B commands set the originating DCE speed to follow the DTE
speed. When originating a call the two modems will not connect at a
speed faster than the lower DCE speed setting of the two modems. To
allow the modem to transmit data at a speed different from DTE speed,
enter the %Bn command where n=1 to 18.

Command

Operation

%B

Use DTE speed

%B1

300 bps

%B2

1200 bps

%B3

2400 bps

%B4

4800 bps

%B5

9600 uncoded bps *

%B6

9600 bps

%B7

7200 bps

%B8

12000 bps

%B9

14400 bps

%B10

600 bps

%B11

16800 bps

%B12

19200 bps

%B13

21600 bps

%B14

24000 bps

%B15

26400 bps

5-28

Modem 3600

AT Commands

Command

Operation

%B16

28800 bps

%B17

31200 bps

%B18

33600 bps

*Valid for V.32 bis modulation only

Note
Use the %B command after the *MM command when specific
modulations are required.

Minimum DCE Speed %L
If the modem connects at a rate lower than the minimum DCE speed, it
disconnects the link automatically.

Command

Operation

%L

Disabled

%L1

Disabled

%L2

1200 bps

%L3

2400 bps

%L4

4800 bps

%L5

9600 uncoded bps *

%L6

9600 bps

%L7

7200 bps

%L8

12000bps

%L9

14400 bps

%L10

600 bps

%L11

16800 bps

%L12

19200 bps

%L13

21600 bps

%L14

24000 bps

%L15

26400 bps

%L16

28800 bps

%L17

31200 bps

%L18

33600 bps

*Valid for V.32 bis modulation only

Modem 3600

5-29

AT Commands

Auto Retrain %E
This option allows the modem to automatically retrain in response to
poor received signal quality without reconnecting. The modem always
responds to a retrain request from the remote modem.

Command

Operation

%E

Disable auto retrain

%E1

Enable auto retrain

Automatic Rate Adaption

%R

Automatic rate adaption (ARA) allows the modem to automatically
decrease the DCE rate when the allowable bit error rate is exceeded. If
the line condition improves the modem automatically increases the rate.
Select this feature by front panel operation orAT command. Options
include: disabled (factory default), low (BER= 1 in 105 ), medium
(BER= 1 in 10 4), high (BER= 1 in 103).
The following guidelines apply to automatic rate adaption:
• Automatic rate adaption is disabled during direct mode.
• Manual rate adaption is disabled from the front panel when
automatic rate adaption is enabled.
• Only one increment or decrement in the DTE rate is allowed at a
time during rate adaption from the initiating modem.
• When online, initiator rate adaption occurs a maximum of every
12 to 14 seconds from the last occurrence of a rate adaption.
• After the modem drops data rate because of poor signal quality,
the line must improve by approximately 2.5 dB before an increase
in rate can occur.

5-30

Modem 3600

AT Commands

Command Operation
%R

Disable automatic rate adaption

%R1

Enable automatic rate adaption using low BER: 1 in 105

%R2

Enable automatic rate adaption using medium BER: 1 in
104

%R3

Enable automatic rate adaption using high BER: 1 in 103

Manual Rate Adaption *RR
The *RR command forces the modem to re-adapt the DCE rate of the
remote modem.

Command

Operation

*RR

Rate adaption to 2400

*RR1

Rate adaption to 4800

*RR2

Rate adaption to 7200

*RR3

Rate adaption to 9600

*RR4

Rate adaption to 12000

*RR5

Rate adaption to 14400

*RR6

Rate adaption to 16800

*RR7

Rate adaption to 19200

*RR8

Rate adaption to 21600

*RR9

Rate adaption to 24000

*RR10

Rate adaption to 26400

*RR11

Rate adaption to 28800

*RR12

Rate adaption to 31200

*RR13

Rate adaption to 33600

Product Revision Level %V
The %V command displays the product revision level.

Modem 3600

5-31

AT Commands

Online Quick Reference

$H

The $H command displays anAT command set quick reference. The
Enter key terminates the page displays and any other key scrolls
through the pages.

Command

Operation

$H

Displays online quick reference

$H=

Search online quick reference for string.

Product Serial Number $V
The $V command displays the product serial number.

Talk / Data *DA
The *DA commands select talk or data mode.

Command

Operation

*DA

Switches modem to talk

*DA1

Switches modem to data

V.32 Fast Train *FT
The V.32 fast train option is used to reduce training time when operating
over high quality, limited distance dial, or 2-wire leased lines.

Command

Operation

*FT

Disable fast train

*FT1

Enable fast train

Incoming Call *IC
The *IC command makes the modem disregard an incoming call.

Line Current Disconnect *LC
Dial line operation only. The modem can be configured to disconnect
upon loss or interruption of telephone line current.

Command
*LC

Operation
Line current disconnect off

*LC1

Line current disconnect short (8 ms)

*LC2

Line current disconnect long (90 ms)

5-32

Modem 3600

AT Commands

Disable AT Command Set *NT
The *NT command disables theAT command set.
The *NT1 command allows the user at a remote modem to enable AT
command operation of another modem via remote configuration.

Command
*NT

Operation
Disable AT command set

*NT1

Enable AT command set at remote site

If the AT command set of a local modem is accidentally disabled and
must be recovered locally, reset the options through the front panel
LCD, Main Menu #5, submenu CHANGE DTE OPTIONS?, “AT COMMAND SET” section on page 4-8.

Dial Line Transmit Level *TDn
Command

Operation

*TDn

Sets dial line TX level to n where n is a number 9
through 30 corresponding to a TX level of -9 to -30
dBm

Private Line Operation
Note
For a 2- or 4-wire leased line connection to succeed, one
modem must be configured as forced answer and the other
modem as normal originate. Both modems should have only
one protocol, MNP or LAPM, enabled and Protocol Fallback
must be disabled. DCE line speed must be the same for both
modems.

4-Wire Operation
In 4-wire operation, the modem is a full-duplex, leased-line modem
requiring a dedicated 4-wire leased line. Only point-to-point dedicated
leased lines are supported. The 4-wire leased line connects to the
TELSET/LEASED LINE jack on the modem rear panel. Dialing is not
necessary. When connected via leased line the modems will train and
begin communicating with each other. The DIAL jack can be used to
connect a 2-wire dial-up line for dial backup.

Modem 3600

5-33

AT Commands

Note
For operation with modems that use V.33 as the modulation
type, the Modem 3600 must be set up to V.33.

2-Wire Operation
In 2-wire operation, the modem is a full-duplex modem able to operate
over 2-wire leased or PSTN lines.
2-Wire Leased Line Operation
The 2-wire leased line is connected to the TELSET/LEASED LINE
jack; the DIAL jack connects to a 2-wire dial-up line for dial backup.
The leased line connects the local and remote modems directly and
dialing is not necessary. One of the modems must be configured for
forced answer and the other for normal originate. When connected via
leased line the modems will connect and begin communicating with
each other.
The &L command is used to select private line (leased line) operating
mode. The *OR commands select the origination or answer mode when
operating in the leased line configuration.
Note
DTR must be held high in 2-wire or 4-wire leased line
operation. This is accomplished by DTE control, wiring pin
20 of the digital interface cable high, or by selecting the
option IGNORES DTR. If DTR is terminal controlled, loss of
synchronization can be corrected by cycling DTR. This
makes the modem initiate the 2-wire training sequence. DSR
goes off during the training procedure.
2-Wire Dial-up Operation:
Connection to the telephone network is through the DIAL jack. A
standard telephone can be connected to the TELSET/LEASED
LINE jack for manual dialing.

5-34

Modem 3600

AT Commands

Dial Backup
Dial backup allows the modem to switch to a dial backup mode if the
data connection on the leased line is unacceptable for communications.
This can be accomplished in two ways:
• Automatic - backup due to extended loss of carrier or 4
unsuccessful retrains in 3 minutes
• Manual - user determined using front panel controls orAT
commands
In leased line operation, if both units have autodial backup enabled, one
must be configured for forced answer. This prevents both units from
dialing if the leased line fails.
IMPORTANT: Both methods will cause the modem to dial the
prestored autodial number. The originate modem will wait for five
seconds and then initiate the call. The answer modem will wait for a
ring. The modems then train and begin communicating over the dial-up
line. If the dial connection is unsuccessful after three attempts, a retrain
on the leased line will be initiated.
In manual mode, the return to leased line is only done when
commanded. In automatic mode the return to leased line is initiated after
the lookback time in register S28 has elapsed. To prevent unnecessary
termination of the dial line connection, a leased line lookback test is
performed. If the leased line is not acceptable, the dial connection is
resumed with a retrain. If the leased line is acceptable, the dial
connection is dropped and normal leased line mode is resumed.
When the unit attempts to return to leased line, the LCD displays
LEASE LOOKBACK. If the leased line has been restored to service,
data can be passed approximately 10 seconds after LEASE
LOOKBACK was initiated. The LCD will continue to display LEASE
LOOKBACK for slightly more than a minute. During this time the dial
line connection is maintained if a return to dial line operation is
required. When the LCD displays ON LINE again the dial line is
disconnected.
Note
A diagnostic test initiated during dial backup mode
terminates when the modem performs a leased line lookback.

Modem 3600

5-35

AT Commands

Dial / Leased Line &L
&L selects line operation as required:

Command
&L

Operation
Dial (switched)

&L1

Leased (private) 2-wire

&L2

Leased (private) 4-wire

Dial Backup *DB
Command

Operation

*DB

Manual dial backup operation

*DB1

Automatic dial backup operation

Return to Leased Line from Dial Backup

*LB

During dial backup operation, *LB makes the modem return to leased
line operation.
During leased line operation with forced answer enabled, *LB makes
the modem wait for a dial backup call.

Manual Dial Backup *LD
*LD dials the autodial number if the modem is in originate mode with
manual dial backup selected. Available in leased line operation only.

Answer / Originate *OR
*OR forces the modem to answer or originate mode. This option is used
during 2- and 4-wire leased line operation with error correction and/or
dial backup.

Command

Operation

*OR

Force originate

*OR1

Force answer

Leased Line Transmit Level *TLn
Command
*TLn

5-36

Operation
Sets leased line TX level to n where n is a number 0
through 30 corresponding to a TX level of 0 to -30
dBm

Modem 3600

AT Commands

Configuration Commands
These commands recall various profiles for insertion into the active
profile, store the active profile and telephone numbers in nonvolatile
memory, and designate the powerup profile. Remote configuration is
discussed on page 5-41.

Configuration Profiles
Modem operations are controlled by option settings selected from
factory defaults stored in ROM, active settings stored in RAM, and
custom settings stored in nonvolatile memory. These three code storage
locations are called profiles.

Active Profile
The active profile holds the current option settings and is used by the
modem for all operations and functions. Any active profile option can
be changed to meet an immediate requirement. The active profile is
maintained in volatile memory referred to as S-registers.

Stored Profile
When an active configuration is established that meets all operating
requirements, it can be transferred to one of the stored profiles. Two
stored profiles are available for greater versatility.
If the active profile has been temporarily changed it can be reset to
either of the stored profiles with the Z command. The &Y command
selects one of the two stored profiles to be the powerup profile.

Factory Profile
The factory configurations are stored in ROM and cannot be changed by
the user; they can be transferred to the active profile and then modified
to fit a specific application if needed. The &F command recalls one of
the nine factory configurations.

Modem 3600

5-37

AT Commands

Storing a Configuration &W
The &W commands store the current configuration options in one of two
nonvolatile memory locations (Figure 5-1). The stored configurations
are retained in memory even when power is off, or until &W is issued
with a new configuration.

Command

Operation

&W

Store options to user option set 1

&W1

Store options to user option set 2

Figure 5-1. Configuration Storage and Recall

Powerup Option Set &Y
The &Y command determines which user option set is loaded during
powerup and reset.

Command

Operation

&Y

Powerup with user option set 1

&Y1

Powerup with user option set 2

&Y?

Displays currently selected powerup option set

5-38

Modem 3600

AT Commands

Load Factory Options &Fn
The &Fn command loads one of the existing configuration sets,
providing a complete configuration for a compatible system/network
environment. Refer to the Appendix H for a complete list of the options
in each set.

Command Operation
&F, &F1

Load factory option set 1 (async dial-up withV.42 bis)

&F2

Load factory option set 2 (async dial-up withoutV.42
bis)

&F3

Load factory option set 3 (sync dial-up without V.42 bis)

&F4

Load factory option set 4 (sync 4-wire leased line
without V.42 bis)

&F5

Load factory option set 5 (async 4-wire leased line with
V.42 bis)

&F6

Load factory option set 6 (async 4-wire leased line
without V.42 bis)

&F7

Load factory option set 7 (sync 2-wire leased line
normal originate)

&F8

Load factory option set 8 (sync 2-wire leased line forced
answer)

&F9

Load factory option set 9 (syncV.25 bis dialer)

Reset to Stored Configuration Z
The Z commands reset the modem and immediately load either user
option set 1 or 2 as the current configuration. This command saves time
once a proven configuration is established.

Command

Operation

Z

Resets the modem and immediately loads user option
set 1

Z1

Resets the modem and immediately loads user option
set 2

Modem 3600

5-39

AT Commands

View Configuration Profiles/Received Signal Options
&V
This command lets the user view the current configuration profile in the
form of S-register values. &V1 displays the received signal options.

Command
&V

Operation
Displays configuration profiles

&V1

Displays received signal options

&V2

Displays active profile

Storing a Telephone Command Line &Zx=n, *CNx,n,
*ND
Nine stored phone number locations of up to 31 characters each are
available in nonvolatile memory. Normally, one phone number per
location is accommodated. However, a phone number longer than 31
characters can overflow into the next location. Any spaces remaining in
the overflowed location cannot be used for another number. The stored
phone number is retained until replaced by another number. Modem
power can be turned off without affecting stored information.
To store a telephone command line in a location, enter the &Zx=n
command where x = the location and n = the number:
AT &Z 8 = 554-1212
In this example the command sequence to dial the indicated number is
stored at location 8 for later dialing.
Note
Neither the AT prefix nor the D command should follow the
&Zx=n.
• &Zx=n - Stores telephone number n, including dial modifiers, at
location x (0-9, up to 31 digits).
• *CNx,n - Stores telephone number n, including dial modifiers, at
location x (0-9, up to 31 digits).
• *CNx,- Clears telephone number location x
• *ND - Displays the stored numbers (1-9).

5-40

Modem 3600

AT Commands

Retaining / Restoring Options *RO
This option is used when the modem is shared by two or more DTEs.
When options are retained, the current configuration is not altered at
disconnect. With options restored, the modem returns to the previously
stored configuration on disconnect.
When options are restored at disconnect, the following commands
return OK but are not executed:
• *CNStore telephone number
• &ZStore telephone number
• &FRecall factory configuration
• &WStore current configuration

Command
*RO

Operation
Retain options at disconnect

*RO1

Restore options at disconnect

Soft Download Password %P1, $Y
Select a numeric password to permit/inhibit software downloading via
flash memory if desired. The process is detailed in Appendix H.

Command

Operation

%P1=pw

Set software download password to 0-99999999

%P1=D

Disable software download

%P1?

Display software download password

$Y

Enable soft download flash

Remote Configuration
This mode of operation allows viewing or modifying the options of a
remote modem that supports remote configuration. Remote
configuration is performed using the front panel LCD or, more
commonly, AT commands from the local terminal. Remote
configuration is initiated by the local (master) modem through a
proprietary protocol, a security code, and an acknowledgment from the
remote (slave) unit to be modified. The security code is inserted and
provides protection from unauthorized entry. The modems are shipped
from the factory without a security code.
Modem 3600

5-41

AT Commands

Note
Remote configuration is supported at all rates except 300 bps.

Remote Configuration Security
The correct security code must be received by the remote modem before
remote configuration can be established. Once established, the local
DTE becomes a virtual terminal and can serve both local and remote
modems. After starting remote configuration, the local DTE serves the
remote modem.
To return DTE service to the local modem while in remote
configuration, issue the +++ escape sequence.
Return DTE service again to the remote modem by issuing the O
command. Switching DTE service between local and remote modems
may be performed as needed.
To exit remote configuration, return DTE service to the local modem.
The &T command will exit remote configuration mode.
Remote configuration may be entered immediately after dialing by
placing the remote configuration command (%T=), without the = sign
and followed by the security code, at the end of the dial string.

Remote Security Code

%P=

A security code prevents unauthorized access to remote configuration
mode. This code is separate from low and high security passwords,
which are discussed in Chapter 8. The security code is user
programmable and can be set to any value from a single 0 to any
combination up to 99999999 using the %P=(desired code)
command.
Example: If the remote modem security code is 12345, the local
modem must include this code in the initialization string before the
remote modem responds.

5-42

Modem 3600

AT Commands

Command

Operation

%P=

Sets security code to a value 0 to 99999999
entered after the equal sign

%P?

Requests local security code to be displayed

%P=D

Access for remote configuration is not possible
when security code is disabled

%P=(blank)

Clears security code

The %P=D command disables remote configuration. To enable remote
configuration, insert another security code.
IMPORTANT: Do not forget your remote security code. Keep your
code in a safe place. If you do forget your code, contact Technical
Support. Refer to the “Calling Technical Support” section on page 12-2.

Entering Remote Configuration

%T=, &T

This mode of operation allows you to view or modify the option set of a
compatible remote modem. Enter the %T= (security code of
remote) command to initiate remote configuration.
The modem is shipped from the factory with security code (blank).
This allows remote configuration by using (blank) as the security
code.

Command

Operation

%T=

This command followed by the correct security
code establishes remote configuration

&T

Exits remote configuration

Remote Configuration can also be specified by the dial command by
placing %T (password) after the dial digits (the equal sign is left
off). For example,
ATD 555-1212%T01234

Enabling/Disabling Remote Configuration *RA
The *RA commands enable and disable remote configuration.

Command

Operation

*RA

Disable remote configuration

*RA1

Enable remote configuration

Modem 3600

5-43

AT Commands

Remote Configuration DTE Speed *RB
This option forces DTE speed to a particular setting, if desired.
Command

Operation

*RB

Remote configuration DTE speed = 300 bps

*RB1

Remote configuration DTE speed = 600 bps

*RB2

Remote configuration DTE speed = 1200 bps

*RB3

Remote configuration DTE speed = 2400 bps

*RB4

Remote configuration DTE speed = 4800 bps

*RB5

Remote configuration DTE speed = 7200 bps

*RB6

Remote configuration DTE speed = 9600 bps

*RB7

Remote configuration DTE speed = 12000 bps

*RB8

Remote configuration DTE speed = 14400 bps

*RB9

Remote configuration DTE speed = 16800 bps

*RB10

Remote configuration DTE speed = 19200 bps

*RB11

Remote configuration DTE speed = 21600 bps

*RB12

Remote configuration DTE speed = 24000 bps

*RB13

Remote configuration DTE speed = 26400 bps

*RB14

Remote configuration DTE speed = 28800 bps

*RB15

Remote configuration DTE speed = 28400 bps

*RB16

Remote configuration DTE speed = 57600 bps

*RB17

Remote configuration DTE speed = 115200 bps

Remote Configuration Format *RF
Set word length, parity, and stops for remote configuration.

Command
*RF

Operation
7 data bits, mark parity, 1 stop bit

*RF1

7 data bits, no parity, 2 stop bits

*RF2

7 data bits, odd parity, 1 stop bit

*RF3

7 data bits, even parity, 1 stop bit

*RF4

8 data bits, mark parity, 1 stop bit

*RF5

8 data bits, no parity, 1 stop bit

*RF6

8 data bits, odd parity, 1 stop bit

*RF7

8 data bits, even parity, 1 stop bit

5-44

Modem 3600

AT Commands

Remote Configuration Saving or Discarding Options
*RQ
This option allows the opportunity to discard an undesirable option.

Command
*RQ

Operation
Save remote configuration option selection and exit

*RQ1

Discard remote configuration option selection and
exit

Modem 3600

5-45

Chapter 6
Protocols
CCITT V.42 bis Error Control Protocol
V.42 bis is an industry standard for error control adopted by the
Consultative Committee for International Telephone and Telegraph
(CCITT). The CCITT V.42 bis protocol incorporates two error control
algorithms, LAPM and MNP. LAPM is a CCITT Link Access Protocol
family member related to LAPB and LAPD, currently in use in other
communications applications. MNP is Microcom Networking Protocol,
which has become an industry standard by the large number of its users.
The use of V.42 bis requires both local and remote modems to beV.42 bis
compatible. Error control protocol is transparent to the user and requires
no special hardware or software. Data to be transmitted is put in a buffer
so the modem can retransmit it if an error occurs. The modem also buffers
data received from the remote modem in case an error occurs and the data
is retransmitted. To avoid overfilling the buffer, flow control is used to
control data between the modem and the terminal. V.42 bis protocol
options can be set by AT commands.
Note
Error control protocols are only valid when using asynchronous
DTE options.

Reliable Mode
When an LAPM or MNP link is established, the modem is in reliable
mode. V.42 bis allows negotiation with a remote modem to the highest
level of protocol common to both units. Both LAPM and MNP control
data errors by retransmitting any block of data that was corrupted in
transit. LAPM is assigned highest priority, and, if not supported, then an
MNP connection is attempted.

Modem 3600

6-1

Protocols

Auto-Reliable Mode
In auto-reliable mode the modem negotiates to the highest protocol
(LAPM or MNP) common to both modems. However, if a reliable
connection cannot be established, auto-reliable allows the protocol to
fallback to normal mode.

Constant Speed Interface
The modem serial port adapts to the data rate of the DTE and does not
change speed if the DCE-to-DCE data link connects at another speed.
Therefore, the DTE-to-DCE interface speed is constant.

Data Compression
Using MNP Class 5 data compression, the modem can achieve data
throughput approaching 33600 bps. With LAPM data compression, the
modem can achieve data throughput approaching 115200 bps. This
increase in speed is achieved by automatically analyzing the data stream
and reducing the number of bits required to represent the characters.
100% error-free transmission is assured by the application of the MNP
or LAPM error control protocol on the compressed data.
Compression takes place only if the modem detects that the remote
modem supports compression. If not, a reliable connection is made
without compression.
Although data compression is compatible with any type of data, it is
most efficient for ASCII text files. For maximum throughput when
using data compression, the terminal should be set to a higher speed
than the connect speed with the constant speed interface on and flow
control enabled. When transmitting or receiving data files in one
direction, the throughput can be increased forV.42 bis by having extra
buffer and more processor time with the %C2 and %C3 data compression
commands.

Normal Mode
No error control, with or without constant speed DTE interface. Data is
buffered.

6-2

Modem 3600

Protocols

Direct Mode
The DTE speed and DCE speed are forced to be the same. No error
control or buffering.
Note
In direct mode, with the DCE link established at a rate other
than the original DTE speed, the modem issues the connect
message for the new DTE speed at the original rate. All
subsequent data will be sent to the DTE at the new DCE
speed.

Flow Control
If the serial port speed exceeds that of the modem connection,
characters may be sent by the DTE to the modem faster than it can send
them to the remote modem. The modem holds characters in an internal
buffer until they can be transmitted. When this buffer is full, the modem
uses flow control to cause the DTE to stop sending characters. As the
modem continues to transmit data and the buffer empties, flow control is
again used to cause the DTE to resume sending data. The modem can
use hardware flow control (RTS/CTS) or in-band flow control (XON/
XOFF).

Protocol Commands
These commands enable or control the various data compression, flow
control, and error correction options of the modem. Tabl e6-1 lists the
features associated with each mode.
Note
Bold text indicates command parameter defaults.

Modem 3600

6-3

Protocols

Table 6-1. Operating Modes and Features
Constant
Speed
Data
InterOperating Error
Compres Flow
Mode
Correction -sion
Control Data face
Normal
Disabled
Not
Allowed Buff- On or off
applicable
ered
Direct

Disabled

Not
applicable

Not
applicable

Not
buffered

DTE=DC
E
(slaved)

Reliable
(MNP and
LAPM)

Enabled

On or off

Allowed

Buffered

On

Autoreliable
(MNP and
LAPM)

Enabled

On or off

Allowed

Buffered

On

Disconnect Buffer Delay %D
Select a delay during which the modem processes data in its transmit
and receive buffers before disconnecting. When a condition exists
which causes a disconnect, the modem tries for n seconds to empty its
buffers. When the buffers are empty or if n=0, the modem disconnects
immediately.

Command
%D

Operation
Disconnect buffer delay disabled

%Dn

Disconnect buffer delay value (n = 1-255 seconds)

6-4

Modem 3600

Protocols

Serial Port (DTE) Constant Speed \J
The \J command allows DCE and DTE to operate at different speeds.
The \J1 command forces serial port (DTE) speed to follow data link
speed in any mode.
If the modem is in direct mode (\J1) and a DCE link is established at a
speed other than that of the original DTE autobaud speed, the modem
will issue the CONNECT message for the new DTE speed at the
original rate. All subsequent data will be sent to the DTE at the new
DCE speed.

Command
\J

Disable slaved DTE/DCE (constant speed DTE on)

Operation

\J1

Enable slaved DTE/DCE (constant speed DTE off)

\J2

Enable 230.4 kbps as DTE speed

\J3

Disable 230.4 kbps as DTE speed
Note
The 230.4 kbps DTE speed is available, but the DTE will not
autobaud to 230.4 kbps. With the modem set for 115.2 kbps,
enter AT\J2 to enable the speed, and reset the DTE for 230.4
kbps. When the modem is set for 230.4 kbps, enter AT\J3 to
disable it if needed. Reset the DTE for 115.2 kbps.

V.42 Optional Detection Phase \M
This is a data sequence that speeds up the LAPM link negotiation time if
V.42 LAPM is supported by the remote modem.

Command
\M

Operation
V.42 fast detect data sequence disabled

\M1

V.42 fast detect data sequence enabled

Modem 3600

6-5

Protocols

Operating Mode \N
Select theV.42 bis mode to be used in data mode. An \Nn command
issued during command mode while a connection is in progress will not
affect the current connection but will be acted on for subsequent
connections. LAPM or MNP protocol operation is referred to as
MNP-only mode, and the auto-reliable modes allow protocol fallback.

Command
\N

Operation
Normal mode — no error control; data buffered

\N1

Direct mode — no error control; data not buffered

\N2

MNP only — try MNP; disconnect if not successful

\N3

MNP or normal — try MNP; fallback to normal async

\N4

LAPM only — try LAPM; disconnect if not successful

\N5

LAPM or normal — try LAPM; fallback to normal

\N6

LAPM or MNP — try both protocols; disconnect if not
successful

\N7

LAPM, MNP, or normal — try both protocols; fallback
to normal if not successful

Auto-Reliable Fallback Character %An
Select the ASCII character to be recognized as the auto-reliable fallback
character by the answering modem. During negotiation of protocol in
auto-reliable mode, the answering modem switches from reliable to
normal mode when receiving the auto-reliable fallback character from
the calling modem and passes the character to the serial port.
Enter the %An command to set the auto-reliable fallback character
(n=1-27 decimal representing an ASCII character).

Command

Operation

%A0

Disable auto-reliable fallback character

%An

Sets ASCII character to be recognized as the
auto-reliable fallback character
Note
The modem must be set for auto-reliable mode (AT\N3,
\N5, \N6, \N7).

6-6

Modem 3600

Protocols

Serial Port Flow Control \Q
The \Q commands set the type of flow control used by the serial port. If
the serial port speed exceeds that of the modem connection, characters
may be sent by the DTE to the modem faster than it can send them to the
remote modem. The modem holds characters in an internal buffer until
they can be transmitted. When this buffer is full, the modem uses flow
control to stop data from the DTE. As the modem continues to transmit
data and the buffer empties, flow control is again used to cause the DTE
to resume sending data.
• The \Q - \Q3 commands affect both DTE and DCE flow control.
• The \Q4 - \Q7 commands affect only flow control by the DCE.
• The \Q command disables flow control bilaterally.
When the \Q1 command is used, the modem generates and accepts
XON/XOFF characters to start and stop the data flow. These characters
have the same parity as the DTE setup taken from the last AT command.
When the \Q2 command is used, the modem uses CTS off to stop the
data from the DTE and CTS on to restart it.
When the \Q3 command is used, the modem uses CTS off to stop the
data from the DTE and CTS on to restart it. The DTE uses RTS off to
stop data from the modem and RTS on to restart it.
The \Q4 command disables flow control by the DCE.
The \Q5 command enables XON/XOFF flow control by the DCE only.
The \Q6 and \Q7 commands force the modem to use RTS off to stop
data from the modem and RTS on to restart it. This does not affect DTE
flow control.

Command
\Q

Disable bilateral flow control

Operation

\Q1

Enable bilateral XON/XOFF flow control

\Q2

Enable DTE CTS flow control, disable DCE flow
control

\Q3

Enable CTS/RTS bilateral flow control

\Q4

Disable DCE flow control

Modem 3600

6-7

Protocols

\Q5

Enable DCE XON/XOFF flow control

\Q6

Enable DCE RTS flow control

\Q7

Enable DCE RTS flow control

XON/XOFF Pass Through \X
This option is active when flow control of the modem by the DTE has
been selected for XON/XOFF and the connect mode is MNP-only or
normal. It enables or disables sending local flow control characters
(XON/XOFF) to the remote modem as well as being acted on in the
local modem. In MNP-only mode the modem treats incoming XON/
XOFF characters from the remote modem as data characters. In normal
mode the modem will look at the \G command and act accordingly.
IMPORTANT: With \X1 in effect, local flow control characters are
sent to the remote system. These characters may turn on the data flow
from the remote system before the modem is ready to receive more data,
possibly resulting in data loss.

Command

Operation

\X

Process but do not pass XON/XOFF characters to
remote DCE

\X1

Process and pass XON/XOFF characters to remote
DCE

Data Link Flow Control \G
This flow control paces data from the remote modem to the local
modem during a normal connection. When the \G1 command is sent,
the modem uses XON/XOFF to start/stop data transmission from the
remote modem. This command is ignored during an MNP connection.

Command
\G

Operation
Disable data link flow control

\G1

Enable data link flow control

6-8

Modem 3600

Protocols

Note
The Modem 3600 will transmit the XON/XOFF characters to
start/stop data transmission from the remote modem. The
Modem 3600 will not respond to the XON/XOFF characters.
This activity ensures that a false XON/XOFF is not detected
resulting in data loss.

Break Control \Kn
Use \Kn (n = 0-5) to indicate the action taken by the modem when a
break is encountered.

Command

Operation

\K

Break option 0

\K1

Break option 1

\K2

Break option 2

\K3

Break option 3

\K4

Break option 4

\K5

Break option 5

Conditions under which breaks may occur are explained below with
descriptions of the modem's response under the different \K command
break options.
A break is sent to the serial port while the modem is in connect state
during a reliable or normal connection (no protocol, data buffered).

Command
\K, \K2, \K4

Operation
Enter command mode but do not send break to the
remote modem

\K1

Empty the data buffers and send break to the remote
modem

\K3

Immediately send break to the remote modem

\K5

Send break to the remote modem in sequence with any
data received from the serial port

Modem 3600

6-9

Protocols

A break is sent to the serial port while the modem is in connect state
during a direct connection (no protocol, data not buffered).

Command
\K, \K2, \K4

Operation
Immediately send break to the remote modem and
enter command mode when break is through

\K1, \K3, \K5

Immediately send break to the remote modem

A break is received from the remote modem while the modem is in
connect state during a normal connection (no protocol, data buffered).

Command

Operation

\K, \K1

Empty the data buffers and send break to the serial
port

\K2, \K3

Immediately send break to the serial port

\K4, \K5

Send break to the serial port in sequence with any
data received from the remote modem

A transmit break command is issued while the modem is in command
state during a reliable (protocol) or normal connection (no protocol,
data buffered).

Command

Operation

\K, \K1

Empty data buffers and send break to the remote
modem

\K2, \K3

Immediately send break to the remote modem

\K4, \K5

Send break to the remote modem in sequence with
any data received from the serial port

Inactivity Timer \T
The \T command specifies the number of minutes the modem will stay
online without transmitting or receiving data before hanging up. When
the value is set to 0, the timer is disabled.

Command
\T

Operation
Disable inactivity timer

\Tn

Set inactivity to n (n=1-255) minutes

6-10

Modem 3600

Protocols

Maximum Reliable Block Size \A
The \A command sets the maximum transmit block size for MNP
connections. Use this command to force the modem to transmit smaller
blocks in an MNP connection. A smaller block size maximizes
throughput when marginal line conditions are causing errors. The
modem sends a block up to the size specified by the \A command.

Command
\A

Operation
Maximum transmit block size = 64 characters

\A1

Maximum transmit block size = 128 characters

\A2

Maximum transmit block size = 192 characters

\A3

Maximum transmit block size = 256 characters

Transmit Break / Set Break Length \B
The \B commands tell the local modem to send a break signal to the
remote modem. In all modes except direct, S79 determines the length
of the break sent to the DTE by the modem receiving a break signal over
the link. S79 may be set directly or via \Bn where n=1-255 in 20 ms
increments. The default is 35 (700 ms).

Command

Operation

\B

Sends a break signal to the remote modem (does not
modify S79)

\Bn

Sets S79 to length of break desired; n=1-255 in 20
ms increments; default= 35 (700 ms)

Set Auto-Reliable Buffer \C
This determines whether or not a modem in reliable mode will buffer
data received from a modem that is not in reliable mode during the 4
seconds in which the modems try to establish a reliable link. Use these
commands when the modem is in the auto-reliable mode and is expected
to process a call from a modem not in a reliable mode.

Command

Operation

\C

Disable auto reliable data buffer

\C1

Buffer data for 4 seconds or 200 characters

Modem 3600

6-11

Protocols

V.42bis Data Compression %C
The %C command determines application of data compression while
running LAPM protocol.

Command

Operation

%C

Data compression disabled

%C1

Enabled on transmit and receive data

%C2

Enabled on transmit data only (enhanced
compression)

%C3

Enabled on receive data only (enhanced
compression)

6-12

Modem 3600

Chapter 7
Test Mode Operation
Diagnostic tests are used to isolate faults in the communications path.
Diagnostic tests terminate after the period of time specified by S18. If
S18 is set to 0, the timer is disabled and tests will run continuously. Tests
may also be terminated by the &T command. When in test modes without
a test pattern, issue the escape sequence +++ to return to command mode
before terminating the test with the &T command.
Note
Local analog loopback with or without a test pattern is the only
test available in protocol mode.

Test Categories
Diagnostic tests fall into two categories: those that can be performed
online or offline and those that must be performed online. Refer to
Table 7-1.

Table 7-1. Diagnostic Test s
Test

Offline

Online

Local Analog Loopback (LAL)

X

X

Local Analog Loopback with Self Test (LAL/TP )

X

X

Local Digital Loopback (LDL)

X

Remote Digital Loopback (RDL)

X

Remote Digital Loopback with Self Test (RDL/
TP)

X

Test Pattern (TP)

X

Modem 3600

7-1

Test Mode Operation

Note
These tests do not apply to fax mode and should only be
performed when the modem is configured for data operation.
LDL, RDL, and RDL/TP tests are initiated after making an online data
connection in normal or direct mode only. LAL and LAL/TP are
initiated while in offline command mode. These tests can be initiated by
AT commands or by using the LCD front panel SELECT TEST menus.
Refer to Table 7-2.
Note
Bold text indicates command parameter defaults.

Table 7-2. Test Commands
Command

Operation

&T

Terminate any test

&T1

Initiate local analog loopback test

&T3

Initiate local digital loopback test

&T4

Grant remote requested digital loopback

&T5

Deny remote requested digital loopback

&T6

Initiate remote digital loopback test

&T7

Initiate remote digital loopback with test pattern

&T8

Initiate local analog loopback test with test pattern

%T

Transmit test pattern

Terminating a Test in Progress &T
Tests can be terminated manually or automatically. The &T command
terminates a test manually. The modem automatically goes to command
mode during LDL, LAL/TP, and RDL/TP tests. Enter the &T command
to terminate the tests. For LAL and RDL, enter the escape sequence
(+++) before the &T command to go to the command mode.
By preloading register S18 with 1 to 255, each test mode automatically
times out after the specified number of seconds and exits back to the
command mode. Loading S18 with 0 disables the auto timeout feature
and the test will run continuously until manually terminated.

7-2

Modem 3600

Test Mode Operation

For example, to run the self test analog loopback test for 30 seconds,
enter
ATS18=30&T8
The modem should respond with 000 after 30 seconds.

Testing the Local Modem
Test local operation with the modem offline in command mode. Use
LAL and LAL/TP to test the local modem and the communications to
the local DTE.
Note
Figures 7-1 through 7-5 include LED test indications. These
indications are valid when DTE options are set by factory
option set #1 and RTS is active from the DTE. Where
indicated, RD and/or TD may be on, off, or flashing
depending on the type of DTE and its operating state.

Local Analog Loopback &T1
In Local Analog Loopback the modem transmitter connects to its
receiver so the analog signal normally sent over the telephone line is
received locally.
If operating on leased lines, the lines are terminated into 600 ohms
(Figure 7-1). If off hook on a dial-up line, the modem is forced on hook.

Figure 7-1. Local Analog Loopback
(4-Wire Operation and 2-Wire Operation)

Modem 3600

7-3

Test Mode Operation

For 2-wire operation, Analog Bilateral Loopback is invalid. In 4-wire
operation, Analog Bilateral Loopback connects the receive line to the
transmit line through a buffer amplifier.
Test the local DTE and cable by entering the &T1 command. Enter a test
message and verify it is echoed on the screen. If it is not returned
exactly as entered, the terminal equipment or data cable is at fault.
To determine if the data cable is defective replace it with a properly
configured cable with electrical continuity. If the cable checks out but
the problem remains, the DTE is defective.
If all local equipment checks out, proceed to the“Testing the Remote
Modem” section on page 7-5.
Issue an escape sequence followed by &T1 to exit analog loopback.

Local Analog Loopback with Self Test &T8
When the modem is offline in command mode, enter the &T8 command
to put the modem in Self Test Local Analog Loopback (Figure 7-2).
The modem transmits a test pattern. The test pattern is looped back to
the receiver and checked for errors. Entering the &T command causes
the modem to exit Self Test Analog Loopback. The modem responds
with a three digit value between 0 and 255 representing the number of
errors during test pattern detection. If errors occur, repeat the test to
verify the consistency of the problem.

Figure 7-2. Local Analog with Test Pattern

7-4

Modem 3600

Test Mode Operation

Testing the Remote Modem
Use LDL, RDL, and RDL/TP in the online data mode to test the remote
modem and phone line. Enter the escape sequence after making a
connection to return to command mode. The appropriate test command,
&T3, &T6, or &T7, can then be entered to initiate an online test.

Local Digital Loopback &T3
After making the data connection, enter the escape sequence to return to
command mode. Entering &T3 puts the local modem in digital
loopback. The remote operator can now send a test message which is
looped back to the remote terminal screen.
If the test timer (S18) was loaded before issuing the &T3 command the
local modem exits the test after the specified number of seconds and
returns to command mode. If not, enter &T to exit the test. Enter the
command to return to online data mode.
The local modem receiver connects to its transmitter so received data is
retransmitted to the remote site.
If Digital Bilateral Loopback is enabled locally, the local DTE is looped
back to itself (Figure 7-3). If disabled, the local DTE receives a constant
mark.

Figure 7-3. Local Digital Loopback with Bilateral Loopback
Enabled

Modem 3600

7-5

Test Mode Operation

Grant/Deny RDL Request &T4, &T5
Local operators can deny a request from the remote modem for remote
digital loopback.
To allow your modem to be placed in RDL by a remote operator, enter
AT&T4
To prevent your modem from entering RDL, enter
AT&T5

Remote Digital Loopback &T6
The initiating modem signals the remote modem to go to Digital
Loopback. The remote modem receives and then retransmits data back
to the local modem. If Digital Bilateral Loopback is enabled on the
remote modem, the remote DTE is looped back to itself (Figure 7-4).

Figure 7-4. Remote Digital Loopback with Digital Bilateral
Loop Enabled at the Remote Site
After making the data connection, enter the escape sequence to return to
command mode. Entering &T6 places the remote modem in digital
loopback provided the remote operator has entered the &T4 command
to allow an RL request. Enter a test message and verify the message is
being looped back to your terminal screen. If the message is incorrect,
use the analog loopback tests on both modems to isolate the problem. If
both modems run analog loopback without errors, the problem could be
with the phone line.

7-6

Modem 3600

Test Mode Operation

Remote Digital Loopback with Self Test &T7
After making the data connection, enter the escape sequence to return to
command mode. Entering &T7 places the remote modem in digital
loopback provided the remote operator enters &T4 to allow an RL
request. Once in RDL/TP, the local modem transmits a test pattern and
automatically verifies that the remote modem is looping the pattern back
(Figure 7-5). Enter &T to exit RDL/TP and return to command mode.
Enter the O command to return online in data mode.
Exiting RDL/TP the modem responds with a three digit value between 0
and 255 representing the number of errors which occurred during test
pattern detection. If errors occur, repeat the test several times to verify
the consistency of the problem, then use the analog loopback tests to
isolate the problem.

Figure 7-5. Local Modem Initiating Remote Digital Loopback
with Test Pattern

Test Pattern %T
In Test Pattern, transmitted data from the local DTE is blocked and
replaced by a V.52 compatible test pattern. When the modem transmits
the test pattern, it expects to receive the same pattern.

Bilateral Digital Test Enable / Disable *DG
Enable or disable bilateral test functions.

Command

Operation

*DG

Bilateral digital loop disabled

*DG1

Bilateral digital loop enabled

Modem 3600

7-7

Test Mode Operation

DTE Controlled Remote Digital Loopback (Pin 21) *RD
To enable DTE Controlled Remote Digital Loopback, enter *RD1.
Enabled, the modem goes into Remote Digital Loopback when it detects
an off-to-on transition of pin 21 while in the online data mode. The test
ends when it detects an on-to-off transition of pin 21 and then returns to
online data mode. To disable this function enter the *RD command.

Command
*RD

Operation
Ignore pin 21

*RD1

RDL enabled (pin 21)

Note
If the test timeout option is enabled and pin 21 remains high,
the modem returns to online mode at the end of the test
timeout period and does not re-enter the test mode until an
off-to-on transition of pin 21 is detected.

DTE Controlled Local Analog Loopback (Pin 18) *LA
To enable DTE Controlled Local Analog Loopback Test, enter *LA1.
Enabled, the modem goes into local analog loopback when it detects an
off-to-on transition of pin 18. The test ends when it detects an on-to-off
transition of pin 18. To disable, enter *LA.

Command
*LA

Operation
Ignore pin 18

*LA1

LAL enabled (pin 18)

Note
If the test timeout option is enabled and pin 18 remains high,
the modem returns to idle mode at the end of the test timeout
period and does not re-enter the test mode until an off-to-on
transition of pin 18 has been detected.

7-8

Modem 3600

Chapter 8
Security
The Modem 3600 series provides three features to assure secure operation
of the modem. These features are front panel password protection, auto
callback, and secure mode of operation. Front panel password protection is
discussed in Chapter 4.
Two levels of major security operation are available: high and low. The AT
commands for each level are explained below.
IMPORTANT: Security requires that you have available your “superuser”
password, explained in the “Superuser” section on page 8-6 and in the
“Setting Passwords $Pn=pw$pw” section on pa ge8-8. Systems administrator functions cannot be accessed without this password. If you forget
the superuser password, contact Technical Support. Refer to “Calling
Technical Support” section on pa ge12-2.

Autocallback Security
Autocallback is an additional security feature that is separate from Low
and High Security. Autocallback forces an answering modem to dial the
selected autodial (*AUn) telephone number after answering a call, holding
the line for one second, and then disconnecting. When autocallback is
enabled the modem will not train on a direct call. Access autocallback via
Main Menu #5 on the LCD. Refer to Chapter 4 for further information.
S72 enables/disables autocallback. S78 determines the delay in seconds
before autocallback is initiated.

Modem 3600

8-1

Security

Low Security Operation
Low security operation provides password protection against
unauthorized dial-up access. High security is another feature which is
discussed later in the “High Security” section on pa ge8-4. The security
feature can be enabled/disabled with AT commands when operating on a
dial-up system.
Transmitted data and received data lines are suppressed to the host DTE
during security validation; all other signals (CTS, DSR, RI, etc.) operate
as selected. After the password has been validated, the modem operates
normally.

Operating without Low Security
The modem is not factory set for security and operates like a standard
V.34, except for additional AT commands which allow access to
security. With these commands a user can set passwords and turn
security on. When security is enabled, a password must be used to
change security options.

Operating with Low Security
A secure modem will not allow data transfer between its host and a
remote host until a correct password is received from the calling party.
If an incorrect password is received the secure modem disconnects. The
front panel is not locked out because this type of security prevents
unauthorized dial-up access.

Remote Operation
The originating modem must transmit the correct security code before
the secure modem will allow data transfer. If accessing a secure remote
modem, the local modem prompts the user with
PLEASE ENTER YOUR PASSWORD ?
To respond to the password prompt, enter
AT$
followed by the password.

8-2

Modem 3600

Security

After receiving the $, the secure remote modem accepts the security
code and waits for a carriage return. Entering more than ten characters is
invalid and causes the secure modem to disconnect. Entering a valid
password causes the calling party's DTE to display PASSWORD
ACCEPTED.

Local Operation
When accessing the local modem, the password is not required except
when the user wants to change a security option. To change a password
or to turn security on or off, the user must enter a password when
entering the appropriate AT commands. EIA-232 signals to the DTE are
not affected by security in command mode.

Passwords
Two passwords of up to ten characters each can be stored in the
modem's nonvolatile memory. AT commands change the passwords.
Backspace and escape keys are not supported for password entry. The
passwords can consist of any printable characters except a dollar sign,
comma, or space. Passwords are case sensitive.
The passwords have the same priority level and are interchangeable
with each other. This can be helpful in situations such as when the user
forgets one of the passwords.

LCD Indication of Security
The front panel LCD indicates whether security is on or off. If disabled,
the LCD appears as if the security does not exist. If enabled, Main Menu
#1 consists of the following display:
SECURE 33600
XXXX

Restrictions in Security Operation
If the caller gives the wrong password, while security is enabled, the
modem will disconnect.

Low Security Commands
The following AT commands operate low security:

Modem 3600

8-3

Security

Set Password $S=x
The $S=x command sets an empty password location to x. This
command only applies when no password or only one is stored in
memory. It cannot be used to change a password.

Changing a Password $C=x, y
The $C=x,y command changes either password where x represents the
old password and y is new one.

Deleting a Password $C=x, The $C=x,- command deletes password x from memory. Security is
automatically disabled if the last password is deleted.

Security Reset $DR
This command resets security to its initial state (off with no passwords
stored). The option is not available in remote configuration.

Disabling Security $D=x
The $D=x command disables security where x is either password.

Security Status $D?, $E?
The $D? or $E? command displays the current status of security
(on or off).

Enabling Security $E=x
The $E=x command enables security where x is either password.

High Security
Compatibility
An originating modem does not require security capabilities to connect
with a secured Modem 3600. Access to the Modem 3600 host is gained
by following the appropriate logon procedure as described in following
text. All security operations are controlled by the secured Modem 3600.

Capacity
The modem stores in nonvolatile memory the password, security level,
callback phone number, and status information for 50 users.

8-4

Modem 3600

Security

Operating without High Security
The modem is factory set with security disabled. In this mode the local
DTE is connected to the local modem as usual, but the command to
enable or view the status of the security feature will be accepted and
processed.

Operating with High Security
With high security enabled, each user must follow the appropriate logon
procedure. The procedure for remote users is determined by their
assigned security level. Upon termination of the connection, the secured
modem waits for the next call and password sequence. A local user must
logon to the secured Modem 3600 to use the unit.
If a power outage occurs, the logged -on user must logon again when the
power is restored. For optimum security operation a reliable connection
should be used.

Security Levels
The Modem 3600 provides three levels of security to prevent
unauthorized access by a remote user.

Level 1: Password Only
This is the lowest level of dial-up security. The user dialing in is
prompted for an ID and password; if invalid, the modem hangs up.

Level 2: Password with Callback
This security level also accepts only calls from preset telephone
numbers. After the user enters a correct ID and password, the modem
looks up the telephone number and calls the user back at that number.

Level 3: Password with Callback and Password ReEntry
This is the highest level of security and is similar to Password with
Callback except that after the user answers the callback call, the modem
prompts again for the password.

Modem 3600

8-5

Security

Superuser
The superuser has access to all user information for administrative
purposes and can change user logon requirements and privileges.
Superuser status can be gained at the local modem or from a remote
modem via remote configuration, if the “Remote Superuser” option is
enabled.
The superuser must first logon as a regular user, then request the
superuser privilege.
Incorrect attempts to gain superuser privilege are logged in the user’s
status information field in nonvolatile memory. After seven invalid
attempts, the user is suspended from access to the Modem 3600 until
cleared by the superuser.
To reinstate a suspended user, logon as a different regular user, then
request superuser privilege in order to clear the illegal attempts count.
If the local superuser disables security, the only security commands
available are those used to enable security or to check security status.

Passwords
Passwords can be changed or deleted by the superuser. The regular user
can change his password only if the “user changes” option has been
enabled by the superuser. Refer to the “Extended Features $W” section
on page 8-9 for more details.
When calling from a remote location, the user is prompted for a
password. After the password is entered, the user is either allowed direct
access or disconnected and called back depending on the assigned
security level.
During password entry or logon, each password character is displayed
as an X on the DTE screen. The backspace key can be used for editing.
For remote logon, press the Esc key at any time before pressing Enter
to clear the password entry.
Incorrect password attempts exceeding the threshold set in S77 for a
specific user will cause the modem to disconnect. Each call exceeding
the threshold increments the ILLEGAL ATTEMPTS counter by one.

8-6

Modem 3600

Security

After seven calls (the default in remote configuration), the ILLEGAL
ATTEMPTS counter will have reached maximum and the user will be
suspended.

Default Passwords
The modem is shipped from the factory with a default password for the
superuser and for one regular user. They are
• SUPERUSER (System administrator)
• USER 1
(User number 1)
Passwords for users 2 through 50 are left blank.
It is recommended that the superuser change the default SUPERUSER
and USER 1 passwords as soon as possible.

High Security Commands
These commands are only available to a local superuser.

Enabling High Security $EH=pw
The $EH=pw command enables high security, where pw is the
superuser’s password.
To initialize high security for the first time enter
AT$EH=SUPERUSER
To enable security, enter
AT$1=USER1
followed by
AT$S=SUPERUSER
to gain superuser status. Passwords, security levels, and callback
numbers can now be entered or modified.
When superuser activities are completed, return to regular user status by
entering AT$$. In regular user status, AT$$ is the final local logoff
command.

Disabling High Security $D
Enter the $D command to disable security. The modem will operate as a
nonsecure unit except that it will respond to enable and check security
status commands.
Modem 3600

8-7

Security

Setting Passwords $Pn=pw$pw
Select a password between 4 and 34 printable ASCII characters.
To store the password enter
AT$Pn=pw$pw
where n is the user number (0-50) and pw is the new password which is
entered twice to ensure that is has been entered correctly.
The $ character is used as the marker between the dual password entries
and cannot be used as part of the password.
Passwords cannot be recalled from nonvolatile memory.
Note
The superuser password is critical because the security
feature cannot be configured without it.
After logon as USER 1 and gaining superuser privileges, enter the $Pn
command to modify passwords.
For the superuser enter
AT$P0=pw$pw
For user 1 enter:
AT$P1=pw$pw
Record the passwords in your personal records.
IMPORTANT: Systems administrator functions cannot be accessed
without it. If you forget the superuser password, contact Technical
Support. Refer to the “Calling Technical Support” section on page 12-2.

Set Security Levels $Ln=m
The System Administrator (superuser) assigns each user with a security
level by entering the $Ln=m command where n is the user number and
m is the security level.

Set User Callback Number $Cn=m
The callback number, used with level 2 or 3 security, is dialed by the
modem after a user has successfully called in from a remote location
and entered his password.

8-8

Modem 3600

Security

Level 1 security does not require a callback number; however, if the
security level is changed to level 2 or 3 a callback number will be
required.
The callback number should be programmed initially using the $Cn=m
command. Where n is the user number and m is the callback number.

Extended Features $W
$W1
A regular user can change his password and callback number if the local
superuser has enabled the $W1 option.
$W2
A remote regular user can gain superuser privilege once the local
superuser has enabled the $W2 command.
$W0
The extended feature options can be cleared by a local superuser by
entering the $W0 command.

Display Extended Feature Status $W?
Enter the $W? command to display the status of the user changes and
remote superuser options.

Display / Reset Illegal Access Attempt Counters $M,
$Mn, $M*
These commands inform the superuser of any illegal attempts to gain
superuser status and the users current status. The status will either be
"normal," indicating the user is still able to logon to the secure Modem
3600, or "suspended," indicating that the user made more than seven
illegal attempts to gain superuser status and has been automatically
suspended.
When the superuser logs on, the secure Modem 3600 automatically
displays any illegal attempts since the last superuser logon. If it is not
reset, the illegal attempt count will remain and the superuser will not be
reminded unless more illegal attempts occur. To manually request this
same information enter
AT$M

Modem 3600

8-9

Security

The Modem 3600 responds by scrolling any illegal attempt information
onto the screen as in the following example:
USER NUMBER: 01, ILLEGAL
ATTEMPTS: 1,
STATUS: NORMAL
USER NUMBER: 14, ILLEGAL
ATTEMPTS: 7,
STATUS: SUSPENDED
OK
Enter the $Mn command (where n equals user number) to reset a
specific user's illegal attempt count.
Enter the $M* command to reset all of the user’s illegal attempt counts.

Factory Reset $F=pw$pw
To reinitialize the security feature enter the $F=pw$pw command
(where pw is the "current" superuser password). This command deletes
all user information and reinstates factory default passwords. User
information cannot be recalled.

Removing a User $Rn
This superuser command removes a user from active status without
deleting all of the user’s information. The user can be restored to active
status by setting the password with the corresponding user number as
previously mentioned. To remove a user, enter
AT$Rn
where n is the user numbers 2-50.
The superuser or user with ID #1 cannot be deleted from the user list.

Security Status $E?
System security status can be verified using the $E? command.

Display User Status $S?
Enter the $S? command to indicate whether or not the current user has
superuser status.
The Modem 3600 responds with one of the following responses:
SUPERUSER STATUS
NORMAL STATUS
8-10

Modem 3600

Security

Verify User Information $In, $IBn
Security level and callback number can be displayed using either the
$In or $IBn command. To display the assigned security level and
callback number for a single user enter
AT$In
where n is the user number. A regular user can only check his own
information. A user with superuser privileges can check any user's
information.
A user with superuser privileges can also display the assigned security
level and callback number for each valid user within a block of ten
consecutive user numbers by entering:
AT$IBn
where n is the first user number.

Request Superuser Privilege $S=pw
Once logged on as a user, superuser privilege can be requested by
entering the $S=pw command, where pw is the superuser password.
When the correct password has been entered, the Modem 3600 responds
with
SUPERUSER STATUS
OK

Local Logon Command $n=pw
Enter the $n=pw command to logon locally to the secure Modem 3600
where n is the user number and pw is the password.

Local Logoff Command $$
To logoff after a local session enter
AT$$

Remote Logon Procedure $n=pw
The remote logon procedure is required to access a secure Modem 3600.
When calling into the secure Modem 3600 from a remote location the
user is prompted to enter a password. The password must be entered as
$n=pw
where n is the user number and pw is the user’s password.

Modem 3600

8-11

Security

If the password entry is incorrect, the password entry field will be
cleared and the remote user will be allowed further entries until the
number of invalid attempts matches the lockout threshold stored in S77.
At this point the secure Modem 3600 drops the call.
If the password entry is correct the secure modem sends the
PASSWORD ACCEPTED message to the remote site. Depending on
the assigned security level, the user is given
• Immediate access to the DTE connected to the secure modem,
• A callback sequence, or
• A callback with password reentry.
When the call is terminated from either end the secure Modem 3600
automatically resets itself to the secure mode for the next remote or
local user.
While a remote caller is initiating a call to the secure Modem 3600, all
status messages and control leads which would notify the local DTE of
the incoming call are suppressed. The secure Modem 3600 uses the
value stored in S0 to determine the number of rings on which to
autoanswer. If S0 is set to 0 incoming calls will not be answered.
If a local user is logged on during an incoming call, a RING message is
displayed but the call will not be answered until the local user logs off,
issues an A command, or presses the TALK/DATA button.
If the local user logs off, the call will be answered and the remote user
must follow the normal password procedure. If the local user enters A or
presses TALK/DATA the call to the remote user connects normally.

8-12

Modem 3600

Chapter 9
Fax Operation
The Modem 3600 can send and receive fax documents at speeds up to
14,400 bps, with the appropriate software. As a fax modem, the modem
conforms to EIA-578, which defines a standard interface between a PC
with fax software and the DCE as a fax modem.
When used with a Class 1 fax software package, Modem 3600 is CCITT
Group 3 compatible and can send and receive documents at 2400, 4800,
7200, 9600, 12,000, or 14,400 bps with any Group 3 fax machine or PC
with a fax modem.
Service Class selection configures the modem for Class 0 data mode or
Class 1 fax mode. The LCD display indicates when fax mode is enabled.
The Modem 3600 default configuration is for data mode; Service Class is
normally only changed by the software as necessary.
Previous chapters in this manual contain information about the modem
that should be understood prior to fax operation.
Read the fax software manual before attempting fax communications.

Fax Operation
The user's manual for the Class 1 fax software package should provide
most information necessary to configure the software and send and receive
faxes.
The information in Chapter 2 of this manual should be considered as well,
and the “Modem Initialization” section on page9-2 provides important
information for proper fax communications.

Modem 3600

9-1

Fax Operation

Modem Initialization
For fax operation, most fax software packages are equipped with a fax
initialization command string. Entering this command sets the active
profile for fax operation. In some cases certain options should be
modified for particular requirements. The fax software manual provides
information about requirements.

Fax Defaults
Factory defaults, along with the initialization command, support fax
operation. Some initialization commands include the default command
&F and will reissue it for each fax operation. Some fax software
packages do not include the default command, or only issue the default
command when the fax software is first loaded. Subsequent fax
operations may not reset the fax profile and, if a fax required option has
been changed, fax operation will not work.
An example of a fax initialization command is
AT&F V E S0=0
This can be interpreted as:
AT&FReset the active profile to the factory default.
V Set response messages to digit code.
E Disable local echo (off).
S0=0 Disable autoanswer (off).

Fax Autoanswer
Some fax software takes control of autoanswer, disables autoanswer for
the modem, and answers the phone as internally programmed. Other
programs do not control autoanswer at all and require the modem to
have autoanswer enabled. You must check the software manual for the
particular requirements and refer to Chapte r4 for manual/autoanswer
and TALK/DATA selection. Select the necessary options for fax
operation.

9-2

Modem 3600

Fax Operation

Fax Associated Options
A number of options can be changed without any effect on fax
operation. These include items like speaker volume and pause for
carrier. Appendix E lists the AT commands. These commands can be
incorporated by personal preference into the initialization command.
Compare fax operation requirements with Appendi xA and if necessary
generate an initialization command string compatible with the software
and the modem.

Stored Fax Profile
Another alternative is to develop a fax initialization command and store
it in one of the user defined profiles. Fax initialization would include the
command that recalls that profile for fax operation. Keep track of option
changes between fax transmissions and if required reset the fax profile
for the next fax transmission.

Class 1 Details
Operation as a fax modem complies with EIA-578; details of Class 1
operation and compatibility are found in that standard. There is no need
to be familiar with these details since they are handled by the Class 1
software package, but this section briefly summarizes some of them.
As a Service Class 1 facsimile DCE, the Modem 3600 provides the
basic services required to support Group 3 facsimile operation. Support
from a Class 1 facsimile DTE is required to implement the CCITT T.30
recommendations for fax document transmission and the CCITT T.4
recommendations for encoding fax images. Using software control, the
modem can:
• Connect calls
• Generate messages
• Detect waiting and silence
• Transmit and receive data
• Provide HDLC data framing, transparency, and error detection
The modem also filters data streams to and from the DTE in accordance
with the Class 1 specification.

Modem 3600

9-3

Fax Operation

The Class 1 standard assumes a serial asynchronous DTE-DCE
connection using EIA-232D (or CCITT V.24) circuits. EIA-232D
circuits AB (signal ground), BA (transmitted data), and BB (received
data) are required for fax operation, while additional circuits are
optional. Refer to Chapter 2 for hardware installation and EIA-232D
data interface information.
The modem uses inband unidirectional DC1/DC3 (XON/XOFF) flow
control to match the DTE-DCE data rate to the line signaling rate
(hardware RTS/CTS is optional). Since 1200 bps is the minimum rate
needed to support T.30 Phase C data transfer using V.29 9600 bps, a
serial port data rate of at least 19,200 bps should be used with the
modem. Since flow control is used, this rate should not be changed
during fax operation. The modem detects the DTE-DCE data rate from
the AT command prefix as described in Chapte r5.

Class 1 Commands
The commands in this section are normally issued by the fax software
and not by the user. They are provided here for reference. While only
the lower order 7 bits of each character are used for commands and
parameters, T.30 Phase C data transmission or reception requires all 8
data bits. Therefore, a data format which uses 8 data bits should be used
for fax mode.

Dial Command D
The dial command D, described in Chapter 5, tells the modem to go off
hook, dial, and begin call origination. For fax operation, set the modem
for Service Class 1 operation before the dial command is issued; use the
+FCLASS=1 command.
The dial modifiers, except R, can also be used in fax mode. Depending
on the X option selected, the modem will return the BUSY and NO
DIALTONE result codes as appropriate. If the modem is in the online
command state when a dial command is issued (e.g., a connection has
already been established), the modem returns an ERROR result code.
The NO CARRIER result code indicates that a connection could not be
established (no carrier detected) within the number of seconds specified
in status register S7, or the dial command has been aborted due to a
character sent from the DTE.
9-4

Modem 3600

Fax Operation

After dialing the specified number in fax mode, the modem generates
1100 Hz CNG tones in accordance with T.30 while trying to detect
either CED (answer back tone) or the HDLC preamble of the first T.30
frame. The CNG tones cease after detecting either of these two signals.
To allow proper interaction with manually answered fax stations,
detection of CED is not required. After detecting 1650 Hz (i.e., the
HDLC preamble of the first frame), the modem enters V.21 Channel 2
receive state with HDLC framing and returns a CONNECT result code.
This is because dialing in fax mode (+FCLASS=1) implies an initial
+FRH=3 command described in the “Fax Transmit and Receive Modes”
section on pa ge9-7.

Answer Command A
The A command instructs the modem to answer the call. For fax
operation, set the modem for Service Class 1 operation before the A
command is issued; use the +FCLASS=1 command.
If the modem is in the online command state when an answer command
is issued (e.g., a connection is already established), the modem returns
an ERROR result code. Otherwise, it answers the call and generates a
2100 Hz CED (answer back) tone in accordance with T.30. The modem
then enters V.21 Channel 2 transmit state with HDLC framing and
returns a CONNECT result code. This is because answering a call in
fax mode (+FCLASS=1) implies an initial +FTH=3 command
described in the “Fax Transmit and Receive Modes” section on
page 9-7. To allow proper interaction with a manually originated fax
call (in accordance with T.30), the modem does not require detection of
CNG before generating CED or entering HDLC transmit mode.
If the DTE sends a character while executing the answer command and
before CED is completed, the call is released and the modem will send
the NO CARRIER result code.

On Hook H
In fax mode, the H command instructs the modem to stop any
transmission and terminate the call by going on hook.

Modem 3600

9-5

Fax Operation

Off Hook H1
The H1 command instructs the modem to go off hook. In fax mode, this
might be used when the user has used manual dialing to place a fax call.
In this case, no CNG tones are generated and the initial +FRH=3 is not
implied; it must be explicitly issued by the software.

Class 0 Operation +FCLASS=0
Setting the Service Class to 0 with the +FCLASS=0 command sets the
modem in data mode. This default setting is normally only changed by
software if needed.

Class 1 Operation +FCLASS=1
Setting the Service Class to 1 with the +FCLASS=1 command
configures the modem as a Class 1 fax modem. This command is
normally only issued by the fax software if needed. When set, the LCD
displays FAX CLASS 1 MODE.

Service Class Indication +FCLASS?
The current Service Class setting can be determined with the
+FCLASS? command. A 0 response indicates the modem is configured
for data mode while a 1 indicates it is set for fax mode. This information
text is preceded and followed by  in addition to being
followed by an appropriate result code response.

Service Class Capabilities +FCLASS=?
The available Service Classes can be revealed by the +FCLASS=?
command. The modem responds with the information text 0, 1
(preceded and followed by ), indicating that the modem
supports both data communication and Class 1 fax operation.

Transmit Silence +FTS=(Time)
The command +FTS=(Time) causes the modem to wait in silence for
the specified amount of time and then send the OK result code to the
DTE. The (Time) value is in 10 ms increments from 0 to 2.55
seconds. The modem aborts the command and sends an OK result code
if the DTE sends an additional character, which is discarded, during the
command execution. This command returns an ERROR result code if
issued while the modem is on hook.

9-6

Modem 3600

Fax Operation

Receive Silence +FRS=(Time)
The command +FRS= causes the modem to listen for silence and report
back an OK result code when the line has been silent for the specified
amount of time. The (Time) value is in 10 ms increments from 0 to
2.55 seconds.
The modem aborts the command and sends an OK result code if the
DTE sends an additional character, which is discarded, during the
command execution. This command returns an ERROR result code if
issued while the modem is on hook.

Fax Transmit and Receive Modes
The following commands instruct the modem to transmit or receive
facsimile data with the designated modulation. Flow control, data
buffering, and data filtering are used as appropriate, in accordance with
the Class 1 specification. Each of these commands must be the last
command on the command line.

Command

Operation

+FTM=(MOD)

Transmit data with (MOD) carrier

+FRM=(MOD) Receive data with (MOD) carrier
+FTH=(MOD)

Transmit HDLC data with (MOD) carrier

+FRH=(MOD)

Receive HDLC data with (MOD) carrier

The modem accepts one of the values listed in Table 9-1.

Table 9-1. Values for Fax Modulatio n
Value

Modulation

Speed

3

V.21 channel 2

300 bps

24

V.27 ter

2400 bps

48

V.27 ter

4800 bps

72

V.29

7200 bps

73

V.17

7200 bps

74

V.17

7200 bps *

96

V.29

9600 bps

97

V.17

9600 bps

*with short train

Modem 3600

9-7

Fax Operation

Table 9-1. Values for Fax Modulation (Continued)
Value

Modulation

Speed

98

V.17

9600 bps *

121

V.17

12000 bps

122

V.17

12000 bps *

145

V.17

14400 bps

146

V.17

14400 bps*

*with short train

The Modem 3600 returns an ERROR result code if any of the above
commands are issued while the modem is on hook.

Facsimile Transmit +FTM=(Mod)
+FTM=(Mod) causes the modem to transmit data using the modulation
and speed selected with the (Mod) parameter. For V.27 ter, V.29, and
V.17 modulations, the modem first transmits the required training
sequence (with echo protector tone). After it is appropriately configured
for transmission, the modem returns the CONNECT result code and
transmits constant 1 bits until data is received from the DTE. For
additional information, consult the Class 1 specification.

Facsimile Receive +FRM=(Mod)
+FRM=(Mod) causes the modem to receive data using the modulation
and speed selected with the (Mod) parameter. If the selected carrier is
detected, a CONNECT result code is sent to the DTE; if a different
signal is detected, the modem sends a +FCERROR (CONNECT
ERROR) result code and returns to command mode. This command is
aborted if the DTE sends any character to the modem other than DC1 or
DC3 during this mode. For additional information, consult the Class 1
specification.

9-8

Modem 3600

Fax Operation

HDLC Transmit +FTH=(Mod)
+FTH=(Mod) causes the modem to transmit HDLC framed data using
the modulation and speed selected with the (Mod) parameter. For V.27
ter, V.29, and V.17 modulations, the modem will first transmit the
required training sequence (with echo protector tone). Configured for
HDLC transmission, the modem transmits HDLC flags and returns the
CONNECT result code. HDLC flags will continue to be sent until the
first byte of data is received from the DTE or until 5 seconds elapses
with no data. For more information, refer to the Class 1 specification.

HDLC Receive +FRH=(Mod)
The command +FRH=(Mod) causes the modem to receive HDLC
framed data using the modulation and speed selected with the (Mod)
parameter. If the selected carrier is detected, a CONNECT result code is
sent to the DTE; if a different signal is detected, the modem sends a
+FCERROR (CONNECT ERROR) result code and returns to
command mode. This command will be aborted if the DTE sends any
character to the modem other than DC1 or DC3 during this mode. For
additional information, consult the Class 1 specification.

Test Supported Range of Values +FTx=?, +FRx=?
The supported range of values for any of the fax transmit or receive
commands can be determined with the +FTx=? or +FRx=? command
where x is M, H, or S. The normal transmit and receive capabilities are
interrogated with +FTM=? and +FRM=?, while the HDLC transmit and
receive capabilities are interrogated with +FTH=? and +FRH=?. Since
the modem can send and receive normal data or HDLC data at all valid
speeds up to 14,400 bps, the modem returns the information text 3, 24,
48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146 for any of these four
commands if x is M or H. For the commands +FTS=? or +FRS=? the
modem returns the information text 0-255, indicating an allowed time
interval from 0 to 2.55 seconds. The appropriate information text is
always preceded and followed by  and followed by an
appropriate result code response.

Modem 3600

9-9

Fax Operation

Class 1 Result Code +FCERROR
If the modem detects any carrier or tone that differs from that specified
in a +FRM or +FRH command, it sends the +FCERROR result code
and returns to command state, allowing the DTE to attempt a recovery.
The numeric form of this response is +F4.

Fax Autoanswer +FAA=
The modem can be set up to automatically detect if a fax or data call is
being answered. The command +FAA=1 enables this function and
+FAA=0 disables it. This feature requires special support by the fax
software package.

Command
+FAA=0

Description
Disable fax autoanswer

+FAA=1

Enable fax autoanswer

DTE Autobaud for Fax Autoanswer *FR
Set the fax autoanswer feature to autobaud at 19.2 kbps or greater, if
desired.

Command

Description

*FR

Forced to > = 19,200 bps

*FR1

Forced to = 19,200 bps

*FR?

Display this option’s current status

Binary File Transfer
Some Class 1 software packages may provide an option for transferring
files between computers with fax modems, using a Binary File Transfer
(BFT) standard. Although the received file is not a fax image,
transmitting the file is similar to sending a fax. Since the modem allows
T.30 error correction mode (with HDLC framing up to 9600 bps), fax
mode can also be used for BFT if supported by the Class 1 software
package. The Binary File Transfer is an option in the fax software
package, not a separate mode of operation.

9-10

Modem 3600

Chapter 10
Status Registers
S-Registers
Most modem configuration information is stored in a part of memory
called status (S) registers. During operation this information is used to
determine modem functions.
Information stored in S-registers can be changed by the AT or V.25
command sets and by pushbuttons in response to the LCD prompt. These
are the preferred methods. Some software programs also access
S-registers by the AT command set, but this action is transparent to the
user. The command indicates which memory bit(s) to alter to select an
option or to perform a function. The S-register values comprise the
configuration profile.
Generally, the user should not directly alter S-register values. However,
the user has the option of entering S-registers via ATS commands and
directly altering the register value. This is called "writing" to an S-register.
Note
Writing to an S-register is not a preferred method and should
only be used by programmers who need to manipulate
S-registers so they can interact with a software program under
development or a similar activity.
Some S-registers cannot be altered by the ATS command series. These are
called “read only” S-registers. In addition to the definitions in this chapter,
Appendix E contains a quick list of S-registers and indicates if they are
read only or read and write.
Figure 10-1 shows how the inputs to an S-register (S22 in this example)
are used to select a particular option. Bits 3 and 2 of S22 control speaker
options. Some communication software packages may use theAT
command set. For example purposes, bit values are arbitrary.

Modem 3600

10-1

Status Registers

Bit values for S-registers must not be confused with the total register
value. Bit values are counted separately for each option group, called bit
mapping, while the register value is the cumulative decimal or
hexadecimal total. The decimal value counts all eight bits as a single
group. Hexadecimal values split the bits into two groups of four each.
Writing to an S-register changes the total value. Figure 10-2 shows the
difference between decimal calculation and hexadecimal calculation.

Figure 10-1. Changing S-Register Values

Figure 10-2. Calculating S-Register Values

10-2

Modem 3600

Status Registers

S-Register Operation

Sn?, Sn?^

Enter ATSn? to read a register value, where n=register number for a
decimal value or ATSn?^ for a hexadecimal value.
For example, to determine the current backspace character enter
ATS5?
The screen will show the ASCII value of the backspace character stored
in register S5.

Changing Register Values

Sn=v, Sn=^v

To change an option using ATS commands requires the operator to
precalculate the revised decimal (or hexadecimal) total.
Note
Because of the chance of miscalculating the bit sum,
causing unplanned option changes, writing to an
S-register is discouraged. For operators who prefer this
method of option selection a much simplified command
that eliminates the decimal calculation is explained in the
“Individual Bit Command Sn . # =v” section on pa ge10-4.
To change a register value, enter
ATSn=v
where n = register number and v = decimal value, or enter
ATSn=^v
where ^v = hexadecimal value.
Note
Not all registers can be set by the ATSn=v (or ^v) command.
Some registers are for reference only.
To change the escape character from + to the Esc key (ASCII value of
27) enter
ATS2=27
To return the modem to the command mode press the Esc key three
times:
(pause) Esc Esc Esc (pause)

Modem 3600

10-3

Status Registers

Individual Bit Command

Sn . # =v

Some operators use AT commands as the primary method of changing
S-register options. However, some options stored in registers do not
have an associated AT command. For these options, the individual bit
AT command can be used to change the setting of the bit controlling the
option.
To change a single bit value within a register, enter
ATSn.#=v
where n = register number, # = bit position 0 through 7, and v = bit
value 1 or 0.
For example, S-register 27, bit 2, selects between dial-up or leased line
operation:
AT command method:
AT&L selects dial-up operation (sets S27 bit 2 to 0).
AT&L1 selects leased line operation (sets S27 bit 2 to 1).
Individual bit method:
ATS27.2=0 selects dial-up operation (sets S27 bit 2 to 0)
ATS27.2=1 selects leased line operation (sets S27 bit 2 to 1)
Note
This way of selecting options can be used on all S-registers
except read only registers.

Autoanswer S0
This register turns the autoanswer option on or off. Set the register to 0
to turn autoanswer off.
Set the register to any value other than zero (1-255) to turn autoanswer
on. The number selected is the ring count the modem answers on. For
example, if S0 equals 4, the modem answers the call on the fourth ring.
The default value is 1.

Ring Count S1
This register contains the ring count for a current incoming call and
should not be changed. If you are developing communications software,
the program can read the register to determine the ring total.

10-4

Modem 3600

Status Registers

Escape Character S2
The standard escape character is a + sign (ASCII value of 43). To
change the character, set S2 to the desired ASCII value (0-127). To
disable the escape command, set S2 to any value greater than 127
(128-255).

End-of-Line Character S3
The standard end-of-line character is the carriage return (ASCII value of
13). This character ends each command as it is sent to the modem. It is
also sent by the modem after each status message or number code. To
change the character, set S3 to the desired ASCII value (0-127).

Line-Feed Character S4
The standard character is the line feed (ASCII value of 10). This
character is sent by the modem after each status message. To change it,
set S4 as desired (0-127).

Backspace Character S5
The standard character is the backspace (ASCII value of 8). To change
it, set S5 to the desired value (0-127).

Pause Before Dialing S6
When dial tone detection is disabled (command X, X1, or X3 in effect),
the modem waits the number of seconds (0-255) stored in this register
before dialing. The default value is 2 (seconds).

Pause for Ringback and Carrier Detection /
Wait for 2nd Dial Tone S7
If ringback is not detected in the number of seconds in S7 (1-255), the
modem disconnects and sends the NO CARRIER message or code. If
ringback is detected, the modem begins to look for a carrier.
If carrier is not detected within the number of seconds in S7, the modem
hangs up and sends the NO CARRIER message or code.
Values between 1 and 255 may be used. The default value is 30
(seconds).

Modem 3600

10-5

Status Registers

Pause Interval for Comma S8
When a dial command contains a comma, the modem pauses the
number of seconds in S8. Change S8 to change the basic pause interval
(0-255), or use several commas in a row for greater delay during dialing.
The default value is 2 (seconds).

Carrier Detect Time S9
S9 contains the amount of time (0-255) in 0.1 second increments that
the carrier must be present to be recognized. The default value is 6
(0.6 second). This timer can be extended to lessen the likelihood of false
detection of carrier.

Lost Carrier Detect Time

S10

S10 contains the amount of time (0-255) in 0.1 second increments that
the carrier must be absent to be recognized as a loss of carrier. The
default value is 14 (1.4 seconds).

DTMF Tone Duration S11
S11 determines the length of DTMF tones. The period of silence is
equal to the duration of the tone. The value of this register must be
entered in multiples of 10. Default value is 80 (80 ms).

Escape Sequence Pause S12
The escape sequence to return to command mode from data mode
requires two pauses, one before and one after the escape characters.
The pauses prevent the modem from responding to a character sequence
which might contain the escape sequence as part of its normal data
transmission.
S12 contains the pause interval in 0.02 second increments. The factory
setting is 50, equivalent to 1 second (50 x 0.02 sec). When S12 is 0,
timing is not a factor.
The timing between the 3 escape characters must be less than the pause
interval or the escape sequence will not be detected. The data rate also
affects the timing and must be taken into account when changing the
pause interval.
To disable the escape command, set S2 to a value greater than 127
instead of changing S12. Values between 15 and 255 may be used for
S12.
10-6

Modem 3600

Status Registers

S13
Not used

Bit Mapped

S14

Note
In the tables for bit mapped S-registers, bold text indicates
bit value defaults.
Note
When bit-mapped S-registers have parallel AT commands,
the commands are listed in the register tables as a cross
reference. If a command does not exist for the option, the
column is left blank.

Bit
0

Value Command Description
--Reserved

1

0
1

E
E1

Local character echo off
Local character echo on

2

0
1

Q
Q1

Response messages on
Response messages off

3

0
1

V
V1

Response messages as digit codes
Response messages as words

4

0
1

Q2

Ignore
Response messages in originate mode
only

5

0
1

T
P

Tone dial
Pulse dial

6

0
1

H2
H3

Allow cleardown
Disallow cleardown

7

0
1

*OR1
*OR

Forced answer
Normal originate

S15
Reserved

Modem 3600

10-7

Status Registers

System Tests

S16

This register contains the status of system test options.

Bit
0
1

Value Command Description
0
-Analog loopback inactive
1
Analog loopback in progress
--Reserved

2

0
1

--

Digital loopback inactive
Digital loopback in progress

3

0

--

Remote digital loopback requested by
other modem inactive
Remote digital loopback requested by
other modem in progress

1
4

0
1

--

Remote digital loopback inactive
Remote digital loopback in progress

5

0
1

--

Self test remote digital loopback inactive
Self test remote digital loopback in
progress

6

0
1

--

Self test analog loopback inactive
Self test analog loopback in progress

7

--

--

Reserved

S17
Not used

Test Timeout S18
Test timeout is the amount of time, in 1 second increments, that a
diagnostic test will run and is determined by the value assigned to S18
(0-255). A value of 0 disables the timer allowing a test to run
indefinitely. The default value is 0.

S19, 20
Not used

10-8

Modem 3600

Status Registers

Bit Mapped S21
Bit

Comman
Value d

Description

6, 0 00
10
01
11

&S
&S1
&S2
&S3

DSR forced on
DSR on when online
DSR off 5 seconds after disconnect
DSR follows off hook (OH)

5, 1 00
10
01

&C
&C1
&C2

11

&C3

DCD always on
DCD on while carrier present
DCD on except for 5 seconds after
disconnect
DCD follows RTS on remote modem; not
valid in reliable mode

0
1

&R
&R1

CTS follows RTS by S26 delay
CTS always on

4, 3 00
01

&D
&D1

10
11

&D2
&D3

Modem ignores DTR
Modem assumes command mode when
DTR turns off
Modem hangs up when DTR turns off
Modem resets when DTR turns off

0
1

Y
Y1

Long space disconnect disabled
Long space disconnect enabled

2

7

Modem 3600

10-9

Status Registers

Bit Mapped

S22

Bit Value Command
1, 0 00
L
01
L1
10
L2
11
L3
3, 2 00
M
01
M1
10
M2
11
M3
X
6-4 000

7

001

X1

010

X2

011

X3

100

X4

0
1

&P
&P1

Bit Mapped

Description
Speaker volume low
Speaker volume low
Speaker volume low
Speaker volume high
Speaker off
Speaker on until carrier detect
Speaker always on
Speaker off when modem is dialing
CONNECT message only, blind dials, no
busy detect
CONNECT / appropriate code for rate,
blind dials, no busy detect
CONNECT / appropriate code for rate,
waits for dial tone, no busy detect
CONNECT / appropriate code for rate,
blind dials, reports BUSY
CONNECT / appropriate code for rate,
waits for dial tone, reports BUSY
Make / break ratio (US) 39/61
Make / break ratio (UK) 33/67

S23

Bit

Value Command Description

0

0
1

&T5
&T4

Remote digital loop request denied
Remote digital loop request granted

5-1

---

---

Reserved

&G
&G1
&G2
--

No guard tones
550 Hz guard tone
1800 Hz guard tone
Not used

7, 6 00
01
10
11

S24
Not used

10-10

Modem 3600

Status Registers

DTR State Recognition

S25

The S25 register specifies the amount of time (0-255) in 0.01 second
(10 ms) increments that DTR must stay high or low in order to be
recognized as such. The default value is 5 (0.05 second).

RTS/CTS Delay

S26

The S26 register specifies the amount of time (0-255) in 0.01 second
(10 ms) increments between the RTS signal and the CTS signal. The
default value is 0.

Bit Mapped S27
Bit

Value Command Description

1, 0 00
01
10
11

&M
&M1
&M2
&M3

Async
Sync data / async dial
Sync data / dial through DTR
Sync data / manual dial

2

0
1

&L
&L1 and
&L2

Dial-up line
Leased line

3

--

--

Reserved

5, 4 00
01
10
11

&X
&X1
&X2
--

Internal clock
External clock
Receive clock
Not used

6

1
0

--

Enable async DTR dialer
Disable async DTR dialer

7

--

--

Reserved

Lookback Timer

S28

The S28 register specifies the amount of time in 1.0 minute increments
that the modem will remain in dial backup mode before retrying leased
line mode. A zero will disable automatic lookback to leased line. The
default value is 15 minutes.

Bit Value Command Description
7- 0 0-255 -Time in 1 minute increments (0=disabled)

Modem 3600

10-11

Status Registers

Bit Mapped S29
Bit
0

Value Command Description
0
*NT1
Enable AT command set
1
*NT
Disable AT command set

1

0
1

*RO
*RO1

Options retained at disconnect
Options restored at disconnect

2

0
1

*FT
*FT1

Disable V.32 fast train
Enable V.32 fast train

6, 3 --

--

Reserved

7

*FB
*FB1

DTE fallback disabled
DTE fallback enabled

0
1

Bit Mapped S30
Bit
0

Value Command Description
--Reserved

1

0
1

--

V.25 ASCII
V.25 EBCDIC

2

0
1

--

V.25 VAL enabled
V.25 VAL disabled

4, 3 --

--

Reserved

5

--

NRZ V.25
NRZI V.25

&M
&M4
&M5
&M6

V.25 disabled
V.25 bisync enabled
V.25 SDLC enabled
V.25 Async enabled

0
1

7, 6 00
01
10
11

S31
Reserved

10-12

Modem 3600

Status Registers

Bit Mapped

S32

Bit
0

Value Command Description
0
&L1
2-wire (leased line only)
1
&L2
4-wire (leased line only)

1

0
1

*LC1
*LC2

Line current disconnect = short
Line current disconnect = long

2

0
1

*LC
*LC1 or
*LC2

Line current disconnect = disable
Line current disconnect = enable

3

0
1

*DB
*DB1

Dial backup = manual
Dial backup = automatic

7-4

--

--

Reserved

S33
Reserved

Bit Mapped

S34

Bit

Value Command Description

0

--

--

Reserved

1

0
1

*DG
*DG1

Bilateral digital = disable
Bilateral digital = enable

2

0
1

*LA
*LA1

DTE commanded LAL = disable
DTE commanded LAL = enable

3

0
1

*RD
*RD1

DTE commanded RDL = disable
DTE commanded RDL = enable

7-4

--

--

Reserved

DTR / Dial Backup Number to Dial S35
Select the number to automatically dial (1-9 of stored numbers) for the
modem to dial in DTR dialing or autodial backup.

S36-S40
Reserved

Remote Configuration Escape Character S41
Select the remote configuration escape character (1-255). The default is
ASCII 61 (=).

Modem 3600

10-13

Status Registers

Remote Configuration Guard Time S42
Select the remote configuration guard time (0-255) in 20 ms intervals.
The default is 50 (1 sec).

S43
Reserved

XON Character from DTE S44
Select the XON character (0-127) to be sent from the DTE. The default
value is ASCII 17.

XOFF Character from DTE S45
Select the XOFF character (0-127) to be sent from the DTE. The default
value is ASCII 19.

S46-48
Reserved

XON Character to DTE S49
Select the XON character (0-127) to be sent to the DTE. The default
value is ASCII 17.

XOFF Character to DTE S50
Select the XOFF character (0-127) to be sent to the DTE. The default
value is ASCII 19.

Dial Line Transmit Level S51
The S51 register selects dial line transmit level from -9 to -30 dBm in 1
dBm increments. The default value is 10.

Bit
4-0
7-5

10-14

Value Command Description
0 to 30 *TDn (n=9 Transmit level in dBm (-9 through -30
to 30)
dBm)
--Reserved

Modem 3600

Status Registers

Leased Line Transmit Level S52
The S52 register selects leased line transmit level from 0 to -30 dBm in
1 dBm increments. The default value is 0.

Bit

Value Command Description

4-0

0 to 30 *TLn (n=0- Transmit level in dBm (0 through -30
30)
dBm)

7-5

--

--

Reserved

Automatic Rate Adaption Threshold S53
Bit
0

1

Value Command Description
0
-Disable rate renegotiation above initial
connect
1
Enable rate renegotiation above initial
connect
--Reserved

3, 2 00

%R

Automatic rate adaption threshold
disabled
Low BER
Medium BER
High BER

01
10
11

%R1
%R2
%R3

4

--

--

5

0
1

6

--

--

Reserved

7

0
1

*DR
*DR=1

Disable distinctive ring detection
Enable distinctive ring detection

Reserved
Protocol negotiation status disabled
Protocol negotiation status enabled

Modem 3600

10-15

Status Registers

Flow Control S54
The S54 register selects the flow control options.

Bit Value Command
1, 0 00
\Q
01
\Q1
10
\Q2
11
\Q3
2
---

Description
Disable DTE flow control
Enable DTE XON/XOFF flow control
Enable CTS flow control to the DTE
Enable bilateral CTS/RTS flow control
Reserved

3

0
1

\G
\G1

Disable modem port flow control
Enable modem port XON/XOFF flow
control

4

0
1

\X
\X1

No XON/XOFF characters to remote
Pass XON/XOFF characters to remote

6, 5 00
01
10
11

\Q4
\Q5
\Q6
\Q7

Disable flow control from DCE
Enable XON/XOFF flow control
Enable CTS flow control to the DTE
Enable CTS flow control to the DTE

7

--

Reserved

--

S55
Reserved

10-16

Modem 3600

Status Registers

V.42 Compression Control S56
Bit Value Command Description
1, 0 00
%C
Compression disabled
01
%C2
Compression enabled on transmit data
only
10
%C3
Compression enabled on receive data
only
11
%C1
Compression enabled on transmit and
receive data
7-2

--

--

Bit Mapped

Reserved

S57

Bit
0

Value Command Description
0
*RC
Standard number codes
15 - 4800 bps
18 - 9600 bps
1
*RC1
Alternate number codes
11 - 4800 bps
12 - 9600 bps

4-1

--

5

0
1

7, 6 --

--

Reserved
Busy out disabled
Busy out enabled during LAL test mode
(for private PBX use only)

--

Inactivity Timer

Reserved

S58

The S58 register specifies the number of minutes the modem waits
before terminating a call when no data is sent or received. This register
is active when in error control mode. 0 disables timer. Issue the \Tn
command to load inactivity timer, n=0-255 minutes.

Bit
7-0

Value Command Description
0
\T
Disable
1-255 \Tn (n=1Timer value in minutes
255)

Modem 3600

10-17

Status Registers

Break Control

S59

The S59 register determines the action taken when a break is
encountered. Refer to the “Break Control \Kn” section on page6-9 for
further information.

Bit

Value Command Description

2-0

000
001
010
011
100
101

\K
\K1
\K2
\K3
\K4
\K5

Break option 0
Break option 1
Break option 2
Break option 3
Break option 4
Break option 5

7-3

--

--

Reserved

10-18

Modem 3600

Status Registers

Bit Mapped

S60

Bit
0

Value Command Description
0
%E
Disable auto retrain
1
%E1
Enable auto retrain

1

0
1

2

0
1

MNP compression disabled
MNP compression enabled
\C
\C1

Disable auto-reliable data buffer
Buffer data for 4 seconds or 200
characters

5- 3 --

--

Reserved

6

0

\R

1

\R1

RI blinks for ring and remains on for
duration of call
RI blinks for ring and turns off when
call is answered

0
1

\V
\V1

7

DTE Options

Disable protocol response messages
Enable protocol response messages

S61

The S61 register indicates the character size and parity. This register is
for reference only.

Bit
2-0

Value Command Description
--Reserved

3

0
1

--

7 bit word length
8 bit word length

5, 4

00
01
10
11

--

Mark parity
No parity
Odd parity
Even parity

7, 6

--

--

Reserved

Modem 3600

10-19

Status Registers

Disconnect Buffer Delay

S62

The S62 register determines the delay before disconnect, to allow buffers to empty, when disconnect conditions exist.

Bit

Value Command Description

7-0

0
1-255

%D
%Dn

Buffer disabled
Disconnect buffer delay value (seconds)

Maximum Transmit Block Size

S63

The S63 register sets the maximum transmit block size.

Bit
7-0

Value
63
127
191
255

Command
\A
\A1
\A2
\A3

Description
Maximum block size = 64
Maximum block size = 128
Maximum block size = 192
Maximum block size = 256

Auto-Reliable Fallback Character S64
The S64 register stores the selected ASCII value of the auto-reliable
fallback character.

Bit
7-0

Value Command Description
0
%A
Disable auto-reliable fallback
character
1-127 %An
ASCII value 1-127

S65-66
Reserved

10-20

Modem 3600

Status Registers

Link Speed Status

S67

The S67 register indicates the true data link (DCE) speed. This register
is for reference only.

Bit

Value

Command Description

4-0

00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010

--

N/A
300 bps
Reserved
1200 bps
2400 bps
4800 bps
7200 bps
9600 bps uncoded
9600 bps trellis
12000 bps
14400 bps
16800 bps
19200 bps
21600 bps
24000 bps
26400 bps
28800 bps
31200 bps
33600 bps

7-5

--

--

Reserved

S68
Reserved

Modem 3600

10-21

Status Registers

DCE Independent Speed S69
The S69 register selects the DCE independent rate operation. When
S69 is 0, DTE and DCE rates are equal and the maximum originate
connect rate up to 14,400 bps is determined by S80. When S69 is
non-zero, the maximum originate connect rate is determined by S69.

Bit

Value

Command Description

4-0

00000
00001
00011
00100
00101
00111
01000
00110
01001
01010
00010
01011
01100
01101
01110
01111
10000
10001
10010

%B
%B1
%B2
%B3
%B4
%B5
%B6
%B7
%B8
%B9
%B10
%B11
%B12
%B13
%B14
%B15
%B16
%B17
%B18

Use rate indicated by S80
300 bps
1200 bps
2400 bps
4800 bps
9600 bps uncoded
9600 bps trellis
7200 bps
12,000 bps
14,400 bps
Reserved
16,800 bps
19,200 bps
21,600 bps
24,000 bps
26,400 bps
28,800 bps
31,200 bps
33,600 bps

7-5

--

--

Reserved

10-22

Modem 3600

Status Registers

Operating Mode S70
The S70 register determines the protocol operating mode and action
taken on an MNP link attempt failure. LAPM is assigned highest
priority.
Example: With \N7 selected the modem tries an LAPM connection
first; if unsuccessful the modem tries an MNP connection; if also
unsuccessful, the modem connects in normal mode. Modes allowing
protocol fallback are referred to as auto-reliable.

Bit
2-0

Value
000
001
010
011
100
101
110
111

Command
\N
\N1
\N2
\N3
\N4
\N5
\N6
\N7

Description
Normal
Direct
MNP only (reliable)
MNP or normal (auto-reliable)
LAPM only (reliable)
LAPM or normal (auto-reliable)
LAPM or MNP only (auto-reliable)
LAPM or MNP or native (autoreliable)

3

0
1

\M
\M1

Disable V.42 fast detect
Enable V.42 fast detect

7-4

--

--

Reserved

Operating Mode Status S71
The S71 register indicates the level of error controlling protocol. This
register is for reference only.

Bit
2-0

Value Command Description
000
-Protocol not active
001
Protocol negotiation in progress
010
MNP level 2 active
011
MNP level 3 active
100
MNP level 4 active
101
MNP level 5 active
110
LAPM active
111
LAPM with data compression active

7-3

--

--

Reserved

Modem 3600

10-23

Status Registers

Bit Mapped S72
Bit
0

Value Command Description
0
\J
Disable slaved DTE/DCE (constant
speed DTE on)
1
\J1
Disable slaved DTE/DCE (constant speed
DTE on)
2, 1 --Reserved
3

0
1

&R9
&R2

CTS does not follow DCD
CTS follows DCD

6-4

--

--

Reserved

7

0
1

--

Disable autocallback
Enable autocallback

Password Timeout S73
S73 sets the length of time the remote user has to enter a password
before the secure Modem 3600 drops the call. The default is 0.

Bit
7-0

Value Command Description
0-255 -Time in seconds (0 = disable)

Callback Delay S74
The length of time the secure modem waits to place the callback call
after the remote user correctly enters a password and the call is dropped.
The default is 15 seconds.

Bit

Value Command Description

7-0

0-255

--

Callback Retry

Time in seconds (0 = disable)

S75

The number of times the modem will attempt to place the callback call
to a remote user if the first attempt is unsuccessful. The default is 0.

Bit

Value Command Description

7-0

0-255

10-24

--

Number of attempts to place the call

Modem 3600

Status Registers

Callback Retry Delay S76
The length of time that the modem waits, after an unsuccessful attempt
to connect to the remote unit at the programmed callback number,
before trying to place the call again. The default is 15 seconds.

Bit

Value Command Description

7-0

0-255

--

Time in seconds (0 = disable)

Lockout Threshold S77
Set the number of incorrect remote user password attempts that can be
made before the call is dropped. The default is 0. When remote
configuration is active, the lockout occurs after seven attempts.

Bit

Value Command Description

7-0

0-255

--

Number of incorrect password attempts
(0 = disable)

Autocallback Timer S78
The S78 register specifies the time in seconds that the modem waits
before initiating autocallback. The default is 30 seconds.

Bit
7-0

Value Command Description
0-255 -Time in seconds before autocallback

Break Length S79
The S79 register sets the length of the break sent to the DTE when a
break signal is received. The range is from 1-255 in 20 ms increments.
The default is 35 (700 ms).

Bit
7-0

Value Command Description
0-255 \B
Send break
\Bn
Set break length (n=1-255)

Modem 3600

10-25

Status Registers

Serial Port or DTE Speed

S80

The S80 register indicates the serial port speed.

Bit
4-0

10-26

Value
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100

Command Description
-300 bps
600 bps
1200 bps
2400 bps
4800 bps
7200 bps
9600 bps
12,000 bps
14,400 bps
16,800 bps
19,200 bps
21,600 bps
24,000 bps
26,400 bps
28,800 bps
31,200 bps
33,600 bps
38,400 bps
57,600 bps
11,5200 bps

Modem 3600

Status Registers

Minimum DCE Speed S81
Bit
4-0

Value
00000
00001
00011
00100
00101
00111
01000
00110
01001
01010
00010
01011
01100
01101
01110
01111
10000
10001
10010

Command
%L
%L1
%L2
%L3
%L4
%L5
%L6
%L7
%L8
%L9
%L10
%L11
%L12
%L13
%L14
%L15
%L16
%L17
%L18

Description
Disabled
Disabled
1200 bps
2400 bps
4800 bps
9600 bps uncoded
9600 bps trellis
7200 bps
12,000 bps
14,400 bps
600 bps
16,800 bps
19,200 bps
21,600 bps
24,000 bps
26,400 bps
28,800 bps
31,200 bps
33,600 bps

7-3

--

--

Reserved

Negotiation Status S82
Bit

Value

Command

1-0

--

--

Reserved

3-2

00
01
10

W
W1
W2

Disable negotiation status
Enable negotiation status
No negotiation status; indicates DCE link
rates

--

--

Reserved

7-4

Description

S83
Reserved

Modem 3600

10-27

Status Registers

Bit Mapped S84
Bit

Value

Command

Description

0

0
1

--

Enable any key abort
Disable any key abort

7-1

--

--

Reserved

S85-S87
Reserved

Modulation Type S88
Bit
3-0

Value Command Description
0000
-Auto mode
0001
V.21
0010
B103
0011
Reserved
0100
B212A
0101
V.22 bis
0110
V.27 (lease line only)
0111
Reserved
1000
V.29 (lease line only)
1001
Reserved
1010
V.33 (lease line only)
1011
V.32 bis
1100
V.34

7-4

Reserved

S89-S90
Reserved

10-28

Modem 3600

Status Registers

Current Modulation S91
The S91 register is for reference only.

Bit
3-0

Value Command Description
0000
-Auto mode
0001
V.21
0010
B103
0011
Reserved
0100
B212A
0101
V.22 bis
0110
V.27 (lease line only)
0111
Reserved
1000
V.29 (lease line only)
1001
Reserved
1010
V.33 (lease line only)
1011
V.32 bis
1100
V.34

7-4

--

--

Reserved

S92 - S94
Reserved

Modem 3600

10-29

Status Registers

V.34 Settings

S95

Bit

Value

Command

Description

0

0
1

--

Disable V.8 for non-V.34 answer
Enable V.8 for non-V.34 answer

3-1

--

--

Reserved

4

0
1

--

Disable non-linear encoding
Enable non-linear encoding

5

0
1

--

Disable pre-emphasis
Enable pre-emphasis

6

0
1

--

Disable constellation shaping
Enable constellation shaping

7

0
1

--

Precoding disabled
Precoding enabled

V.34 Asymmetric Settings
Bit

Value

S96

Command

Description

4-0

--

--

Reserved

5

0
1

--

Disable asymmetric bit rates
Enable asymmetric bit rates

6

--

--

Reserved

7

0
1

--

Disable TX power control
Enable TX power control

Bit Mapped S97
Bit

Value

Command

1-0

00
01
10

*TH
*TH1
*TH2

V.34 rate threshold low (10- 6 BER)
Medium V.34 threshold (10- 4 BER)
High V.34 threshold (10- 2 BER)

Description

7-2

--

--

Reserved

S98- S100
Reserved

10-30

Modem 3600

Chapter 11
V.25 bis Autodialer
V.25 bis is an option that allows dialing functions to be controlled using
synchronous data.
Select V.25 bis through the appropriate &M command in the AT
command set (refer to the “Asynchronous / Synchronous Mode
Selection &M” section on pa ge5-25).
If using the LCD,
1) Scroll through the menu to Main Menu 5, MODIFY
CONFIGURATION.
2) Advance to and enter the DTE PARAMETERS submenu.
3) Select SYNC DATA.
4) Advance to DIAL METHOD.
5) Select one of V.25 BISYNC DIALER, V.25 SDLC DIALER,
or V.25 ASYNC DIALER, and then select either ASCII or
EBCDIC character format.
Note
The modem must be configured asV.25 SDLC ASCII NRZ for
use with an AS400 IBM computer.

Modem 3600

11-1

V.25 bis Autodialer

Autodialer Command Strings and Parameters
Most command strings for the autodialer include two parts: the
command itself and the parameters that follow. For the purposes of this
chapter, parameters can be telephone numbers or anything appropriate
to V.25 bis as described in the following text. Parameters are separated
by semicolons.
For example:
PRN a; nnn . . . n
where a= the phone number address in memory and nnn...n= the
phone number. The a and the nnn...n are both parameters. Not all
commands have parameters. For example the CIC command has no
parameter.

Software Guidelines
• An indicator enclosed in less than/greater than signs represents a
specific character in the appropriate character set, ASCII or
EBCDIC.
 - space
• Each response below is considered an individual message by V.25
bis conventions. For example, a dial command with intermediate
call progress enabled (BISYNC mode ASCII/EBCDIC character
set) is:
From computer To computer
CRN(205)555-0124 VAL

• V.25 bis commands can be in one of these data formats:
ASYNC
BISYNC
SDLC NRZ
SDLC NRZI
in ASCII or EBCDIC
Access these formats using:
&MAsynchronous dial/asynchronous data
&M1Asynchronous dial/synchronous data
&M2Dials stored number when DTR off/on transition is detected/sync data

11-2

Modem 3600

V.25 bis Autodialer

&M3Manual dial/sync data
&M4V.25 bis dialer/BISYNC protocol/sync data (ASCII)
&M5V.25 bis dialer/SDLC protocol/sync data (NRZ)
&M6V.25 bis async dial/sync data
&M7V.25 bis async dial/async data
&M8V.25 bis dialer w/BISYNC protocol/sync data (EBCDIC)
&M9V.25 bis dialer w/SDLC protocol/sync data (EBCDIC) (NRZ)
&M10V.25 bis dialer w/SDLC protocol/sync data (ASCII) (NRZI)
&M11V.25 bis dialer w/SDLC protocol/sync data (EBCDIC) (NRZI)
• Separator fields depend on the data format.
for ASYNC {sep} = command 
BISYNC {sep} =  command 
SDLC {sep} =  command
 where:
 = 16 hexadecimal
 = 02 hex
 = 03 hex
 = 17 hex
 = 7E hex
 = FF hex
 = 13 hex (last frame), 03 hex (not last frame)
 = Frame Check Sequence
 = Carriage Return

Invalid Responses
Except when stated otherwise, the following explanations for invalid
INV responses apply:
INVCUAny transmission error (parity, framing, etc.).
INVMSThis message has one of three possible meanings:
1) Receiving too many characters for any command.
2) Any command followed by a semicolon ;
INVPSThis message has one of three possible meanings:
1) Any parameter set ending with a semicolon ;
2) Any parameter set containing too many or not enough
parameters; this includes
- any command entered without parameters that
requires parameters
- any command entered with parameters that
does not require parameters.
Modem 3600

11-3

V.25 bis Autodialer

3) Any parameter containing too many characters.
INVPVThis message has one of three possible meanings:
1) Any parameter set containing invalid characters
2) Any parameter or parameter set containing no valid (only
ignored) characters
3) Any parameter set containing an out-of-range parameter

Dial Parameters
Table 11-1 lists and describes the parameters used in autodialing. The
memory available for dialing can hold up to 40 characters. Parameters
inserted for readability are not counted.

Parameters
0 thru 9

Function
DTMF and pulse digit

* and #

DTMF digit

W

Wait for 2nd type of dial tone

>

Pause for 1 second

=

Pause for 3 seconds

<

Pause for programmed delay time

P

Pulse dialing

T

Tone dialing

&

Flash (go on hook) for ½ second

;

PARM separator

Space, dash,
parenthesis, period

Parameters inserted for readability

V.25 bis Commands and Responses
The following sections describe the commands used with the V.25 bis
autodialer and explain the responses received when each command is
executed.

11-4

Modem 3600

V.25 bis Autodialer

Dial Command CRN nn...n
The dial command is a CRN followed by the number to be dialed
nn...n. The modem accepts up to 40 dial parameters, excluding the
CRN command and any leading spaces.
Responses:
VALValid command received. Transmitted on receiving an errorfree command with no transmission error such as a parity error.
This confirmation is sent before the command is executed.
INVCUInvalid command - command unknown.
Example: TRN (205)-555-0124
INVMSInvalid command - message syntax error.
Examples: CRN;(205)-555-0124
CRN; (semicolon invalid)
INVPSInvalid command - parameter syntax error.
Examples: CRN (205)-555-0124
CRN (205)-555;0124
CRN
INVPV Invalid command - parameter value error.
Examples: CRN (205)-555-012Q
CRN
CFIETCall failure - reorder or busy.
CFIRT Call failure - timeout occurred.
CFINTCall failure - no answer back tone.
CFIDTCall failure - no dial tone.
CFIAB Call failure - ABT detected but no carrier.
INCIncoming ring detected.

Program Number Command PRN a;nn...n
The program number command is PRN followed by the one digit decimal
address a and the number to be stored nn . . . n. Each address can
store up to 31 dial parameters. Ignored characters in the dial number are
not stored. Nine stored numbers are available at addresses 1-9.
Responses:
Same as for the CRN command except for call progress responses.
Modem 3600

11-5

V.25 bis Autodialer

Intermediate Call Progress Response
The following response is given only if enabled. See Option Definition
002 below.
CNX@nnnnnBPS
where nnnnn is the line speed. This connect response appears after
handshake completed, but before DSR is activated. This response is
required if the intermediate call progress option is enabled.

Dial Stored Number CRS a
The command for dialing a stored number is CRS followed by the one
digit address a for the stored number to be dialed.
Responses:
Same as for the CRN command plus
CFINSCall failure - number not stored.
If the number is linked with other numbers via a PRL command, failure
responses are returned as
{sep}a;{call progress messages} . . .
where a is the address dialed, followed by the separator field and call
progress messages (CFI, etc.).
If the call fails to connect and the number is linked with other numbers,
the autodialer tries to call the next number in the list of linked numbers.

11-6

Modem 3600

V.25 bis Autodialer

Request List of Stored Numbers RLN
The request list of stored numbers command is an RLN.
Responses:
INVCUInvalid command - command unknown.
Example:TLN
INVMSInvalid command - message syntax error.
Example:RLN;
If no number is stored at the specified address nothing is returned for
that address. The separator {sep} is a
LSN
sequence for BISYNC format (the last LSN string terminates with
 per V.25 bis). For synchronous bit-oriented operation, each LSN
string is treated as an individual message per V.25 bis.
All stored numbers are sent to the DTE as
LSNa;nn...n{sep}a;nn...n...
where a is the stored number address and nn....n is the number stored.

Disregard Incoming Call DIC
The command for disregarding an incoming call does not require
parameters. If no call is incoming, the command is ignored.
Responses:
VALValid command received. Transmitted on receiving an errorfree command with no transmission error such as a parity
error. This confirmation is sent before the command is executed.
INVCUInvalid command - command unknown.
Example:TIC
INVMS Invalid command - message syntax error.
Example:SIC;

Modem 3600

11-7

V.25 bis Autodialer

Connect Incoming Call CIC
No parameters are required. If there is an incoming call, the modem
immediately answers the call. If no call is incoming, the command is
ignored.
Responses:
Same as for the DIC commandI

Redial Last Number CRR n
The CRR n command redials the last number a maximum of n times. If
no parameters are present, the modem redials once. Also, the maximum
number of redials, the amount of time between redials, and other
parameters may vary depending on application and national
requirements if outside the U. S.
Responses:
Same as for the CRS command.
Failure response is
{sep}r;{call progress messages}...
where r is the recall count (1 ≤ r ≤ n; 1,2...,etc.), followed by a
separator field and call progress messages (CFI XX, etc.). If the call
fails to connect, this is repeated for the specified number of times.

Link Number by Address PRL a;b
This command links the number at address a with the number at address
b. The addresses are one digit decimal values. Linking numbers enables
different numbers to be dialed if a call failure occurs.
Only forward linking to one other number is allowed, so address 1 can
be linked to 4 to 8 to 9 etc.; however (using this example), if address 4 is
dialed by a CRS command without connection it links forward to 8 then
to 9.
If all these fail to connect, the autodialer will not back-link to address 1
unless circular linking is used. Numbers may be linked as 4 to 5 to 3;
however, if address 3 is dialed, back-linking to 5 is not allowed.

11-8

Modem 3600

V.25 bis Autodialer

If circular linking (1 to 8 to 7 to 1) is used, dialing is discontinued after
the addressed number in the dial command has been dialed twice. If
only one parameter follows the PRL command, the number at address a
is unlinked from its forward link.
For example, if the link list 4 to 8 to 3 to 7 to 9 to 1 exists andPRL 7 is
received, 7 would be unlinked from 9, but not from 3. This would result
in two link lists: 4 to 8 to 3 to 7 and 9 to 1.
Responses:
VALValid command received. Transmitted on receiving an errorfree command with no transmission error such as a parity
error. This confirmation is sent before the command is executed.
INVCUInvalid command - command unknown.
Example:TRL 1;5
INVMSInvalid command - message syntax error.
Examples:PRL;1;5
PRL;
INVPS Invalid command - parameter syntax error.
Examples:PRL 1;5;
PRL 1;0;0
PRL 1;
PRL
PRL 001;5
INVPVInvalid command - parameter value error.
Examples:PRL 1;Q
PRL Q;1
PRL 1;45 where addresses 01-09 are defined
CFILDCall failure - no connection from link list.

Request List of Linked Numbers RLL
The request list of linked numbers command is an RLL with no
parameters.
Responses:
INVCUInvalid command - command unknown.
Example:TLL

Modem 3600

11-9

V.25 bis Autodialer

INVMSInvalid command - message syntax error.
Example:RLL;
LSLList linked numbers.
In all LSL examples, if no number is stored at the specified address no
response is sent. The separator field for BISYNC is an
LSL
The last LSL string ends with  per V.25 bis. For synchronous bit
oriented operation, each LSL string is treated as an individual message
per V.25 bis. All linked numbers are sent to the DTE as
LSLa;l{sep}a;l
where a = stored address and l = link address.

Request List of Version RLV
The request list of version information command is an RLV with no
parameters.
Responses:
INVCUInvalid command - command unknown.
Example:TLV
INVMSInvalid command - message syntax error.
Example: RLV;
LSVList version
The version information is sent to the DTE as
LSVSbbbbbbb00sccppddr /
comment field
where bbbbbbb is the board number, s is the series number, cc is the
controller code revision, pp is the data pump code revision, dd is the
board dash number, and r is the printed circuit board revision followed
by a comment field.

MODEM OPTIONS COMMAND PRO xxx;yy;0;0...
The program options command is PRO followed by the starting register
address (1 to 3 decimal digits), option count (1 or 2 decimal digits) and
the data for each option (1 to 3 decimal digits per option). The
“Options” section on pa ge11-14 lists all available options with
definitions, possible settings, and default values.

11-10

Modem 3600

V.25 bis Autodialer

The modem must be able to accept 40 non-ignored characters besides
the PRO command (leading zeros and semicolons are not considered
ignored characters).
Responses:
VALValid command received. Transmitted on receiving an errorfree command with no transmission error such as a parity
error. This confirmation is sent before the command is executed.
INVCUInvalid command - command unknown.
Example: TRO 0;1;1
INVMS Invalid command - message syntax error.
Examples:PRO;0;1;1
PRO;
INVPSInvalid command - parameter syntax error.
Examples:PRO 0;1;0;
PRO 0;1;1;1
PRO
PRO 0;001;1
INVPVInvalid command - parameter value error.
Examples:PRO 0;1;Q
PRO Q;1;1
PRO 0;0;0
PRO 68;1;0
when option 68 is undefined for the modem.
INVPVxxxInvalid command - parameter value error.
Example: PRO 10;5;0;0;0;2;1
This invalid message can be returned when a block of options is being
changed. The conditions for this invalid response are as follows:
• An undefined option number is specified. In the above example, if
option 12 is undefined for a certain modem (and no other error
conditions apply) options 10 and 11 would be changed as
specified in the command message. The next option to be changed
would be option 12. The modem would detect that this is an
undefined option, stop execution of the command, and return an
INVPV012 message. Options 10 and 11 would still be changed as
commanded; options 13 and 14 would be unchanged.

Modem 3600

11-11

V.25 bis Autodialer

• An out-of-range value for a particular option is specified In the
above example, if the fourth value in the option string is
undefined or out-of-range for option 13 in a certain modem (and
no other error conditions apply), options 10 through 12 would be
changed as specified in the command message. The next option to
be changed would be option 13. The modem would then detect
that the value is undefined or out-of-range for that option, stop
execution of the command, and return an INVPV013 message
Options 10 through 12 would still be changed as commanded;
options 13 and 14 would be unchanged.

Save Current Settings PRK
PRK saves the current option settings.
Responses:
VALValid command received. Transmitted on receiving an errorfree command with no transmission error such as a parity
error. Confirmation is sent before the command is executed.
INVCUInvalid command - command unknown.
Example: TRK
INVMSInvalid command - message syntax error.
Examples:PRK;0
PRK Q

Restore Factory Settings PRP n
PRP n restores current option settings to factory option set n where n is
a 1 digit decimal number.
Note
Restoring a factory option set other than factory option 9
disables the V.25 synchronous dialer.
If no parameter follows the command, the modem automatically selects
factory option set 1.
Responses:
VALValid command received. Transmitted on receiving an errorfree command with no transmission error such as a parity
error. This confirmation is sent before the command is executed.

11-12

Modem 3600

V.25 bis Autodialer

INVCUInvalid command - command unknown.
Example:TRP
INVMSInvalid command - message syntax error.
Examples:PRP;1
PRP Q
INVPS Invalid command - parameter syntax error.
Examples:PRP 1;
PRP 1;1
PRP 001
INVPV Invalid command - parameter value error.
Example:PRP 5
where factory default 5 is not defined for the modem. Current modem
factory options are 1-9.

Request List of Stored Options RLO xxx; yy
The request list of stored options command is RLO followed by an
optional 1 to 3 digit decimal address and a 1 or 2 digit decimal count.
The “Options” section on page 11-14 lists all available options with
definitions, possible settings, and default values.
Responses:
INVCUInvalid command - command unknown.
Example:TLO 0;1
INVMS Invalid command - message syntax error.
Examples:RLO;0;1
RLO Q;1
INVPSInvalid command - parameter syntax error.
Examples:RLO 0;1;
RLO 0;1;4
RLO 0;001
INVPV Invalid command - parameter value error.
Examples:RLO 0;Q
RLO 0;0
RLO999;45
LSOList stored options.

Modem 3600

11-13

V.25 bis Autodialer

The separator {sep} for BISYNC is an
LSO
sequence for the sync format (the last LSO string terminates with 
per V.25 bis). For synchronous bit oriented operation, each LSO string
is treated as an individual message per V.25 bis.
If no parameters follow, all stored options are sent to the DTE as
LSOxxx;ooo{sep}xxx;ooo...
Each value must be padded with leading zeros so that each field has
three characters. Option zero would be sent as
LSO000;000
If only an address follows the command, the single requested option is
sent to the DTE as
LSOxxx;ooo
If address and count follow the command, the requested count of
options starting with the specified address are sent to the DTE as
LSOxxx;ooo{sep}xxx;ooo...

Options
You can change the options for the V.25 bis autodialer using the PRO
command or list them using the RLO command. Options are listed in
Table 11-2.

Table 11-2. V.25 Autodialer Options
Option
002:

Definition
Intermediate call progress
messages

Settings
0 - Disable
1 - Enable

Default
0

003:

Blind dial

0 - Disable
1 - Enable

0

007:

Long space disconnect

0 - Disable
1 - Enable

1

11-14

Modem 3600

V.25 bis Autodialer

Table 11-2. V.25 Autodialer Options (Continued)
Option

Definition

Settings

Default

051:

Primary transmit / receive
rate

007: 1200 bps
008: 2400 bps
034: 4800 bps
035: 9600 bps
uncoded
036: 9600 bps
046: 7200 bps
047: 12,000
bps
048: 14,400
bps
049: 16,800
bps
050: 19,200
bps
051: 21,600
bps
052: 24,000
bps
053: 26,400
bps
054: 28,800
bps
055: 31,200
bps
056: 33,600
bps

54
(28800
bps)

055:

Transmit clock

0 - Internal
1 - External
2 - Receive
(slave)

0

063:

Autoanswer

0 - Disable
0
1 - Enable
(answer after
1 to 255 rings)

Modem 3600

11-15

V.25 bis Autodialer

Table 11-2. V.25 Autodialer Options (Continued)
Option

Definition

Settings

Default

064:

Line current disconnect

0 - Off
1 - Short (8
ms)
2 - Long (90
ms)

2

076:

Speaker control

0 - Off
1 - On
4 - On until
CD
6 - Off when
dialing

4

077:

Speaker volume

0 - Low
1 - Medium
2 - High

1

085:

Constant carrier RTS/CTS
delay

0 to 250 ms
10 ms
increments

0

087:

DTR dropout timer
DTR must turn off for this
length of time to be
recognized.

0 to 255 in 10
ms
increments

5 (50 ms)

089:

Pause in dial string

0 - Invalid
1 to 255
seconds

2

090:

Carriage return character

ASCII or
EBCDIC
character
range

13 dec

091:

Line feed character

ASCII or
EBCDIC
character
range

10 dec
ASCII;
37 dec
EBCDIC

11-16

Modem 3600

V.25 bis Autodialer

Table 11-2. V.25 Autodialer Options (Continued)
Option

Definition

Settings

Default

092:

Guard tone

0 = None
1 = 550 Hz
2 = 1800 Hz

0

093:

Carrier detect delay

0 - Off; 1 to
255
10 ms
increments

6
(60 ms)

094:

Loss of carrier disconnect

0 - Off 1 to
255
100 ms
increments

14
(1.4 sec)

095:

DTR dial address - Stored
telephone number address to
dial on DTR off-to-on
transition

096:

DTR dial

0 - Disable
1 - Enable

0

098:

Call timeout

0 - Off
1-255 sec

30 sec

103:

Signal quality retrain

0 - Disable
1 - Send
training
sequence on
poor quality

1

111:

Modulation mode

000: Automode
001: V.21
002: B103
005: V.22
006: V.22 bis
007: V.27 ter
009: V.29
012: V.32 bis
013: V.34

Modem 3600

1

11-17

V.25 bis Autodialer

Table 11-2. V.25 Autodialer Options (Continued)
Option

Definition

Settings

112

V.34 Select Threshold

000: Low
001: Medium
002: High

113

V.34 Asymmetric bit rates

000: Disabled
001: Enabled

903:

Bilateral loop - If enabled and 0 - Disabled
a test is commanded, bilateral 1 - Enabled
loop is defined as follows:
Test Bilateral Commanded
Loop
Loop 1
Loop 2
Loop 2
Loop 1
Loop 3
Loop 4
Loop 4
Loop 3

Default

0

Loop definitions per CCITT
V.54.
904:

Computer commanded
remote digital loopback

0 - Disable
1 - Enable

0

905:

Computer commanded local
analog loopback

0 - Disable
1 - Enable

0

906:

Remote commanded test

0 - Disable
1 - Enable

1

907:

Test timer

0 - Until DTR 0
drops
TTT - 1 to 255
sec

11-18

Modem 3600

Chapter 12
Maintenance
Warning
Disconnect power before performing maintenance.
Although dangerous voltage levels are not exposed,
disconnecting power ensures that no electric shock hazard
is present.

General
The modem contains no internal electronic components that can be
serviced or replaced by the user. Repairs should not be attempted by the
user.

Fuse Replacement
If a fuse fails, replace it with one of equal rating. Repeated failure
indicates a more serious problem.

Maintenance
The modem provides maintenance-free service. Periodically it is advisable
to remove dust that has collected on internal components. If attempting to
clean the modem, remove dust with a soft bristle brush and low pressure
air or vacuum.
Before attempting diagnostic tests, verify that all connectors and plugs are
firmly inserted. The test procedures identify the faulty component in a bad
communications link.

Modem 3600

12-1

Maintenance

Calling Technical Support
The Service and Support page at the back of this User’s Guide contains
several phone and faxback numbers and the Web address. If calling
Technical Support, please call from a location near the computer with
the modem. It helps expedite the call to have the following information
available:
• Type of modem -- Modem 3600
• Modem serial number
• Date code
• Purchase date
• Type and version of software, including data communications,
fax, and browser/reader software
• Type and version of other software running at the same time
Note
Do not return the modem to the manufacturer without prior
authorization.
If the unit appears faulty, contact Black Box Technical Support at
724-746-5500 (USA) for service and assistance.

12-2

Modem 3600

Appendix A
Specifications
Size
Width7.0 inches (17.78 cm)
Depth10.5 inches (26.67 cm)
Height2.25 inches (5.72 cm)
Weight2 lbs. 13 oz. (1.28 kg)
Front Panel32 ASCII character LCD

Environmental Conditions
Temperature:
Operation +32° F to +122° F
(0° C to +50° C)
Storage -40° F to +158° F
(-40° C to +70° C)
Humidity:0 to 95% relative humidity, noncondensing

Power Requirements

Voltage:115 Vac ±10%; 50-60 Hz,
or
12 to 60 Vdc
Power consumption: 14 watts

Telephone Line
Balanced 600 ohm type 3002 or equivalent 16 dB nominal loss, frequency
translation up to ±10 Hz

Digital Interface
Conforms to EIA-232D and CCITT V.24

V.3600

A-1

Specifications

Modem Data Rates
300, 1200, 2400, 4800, 7200, 9600, 12000, 14400, 16800, 19200,
21600, 24000, 26400, 28800, 31200, 33600 bps.

Fax Rates
14400, 12000, 9600, 7200, 4800, and 2400

Modulations
V.34, V.32, V.22, V.21, V.27 bis, V.29, Bell 103, Bell 1200, V.17, V.33,
V.22 bis, V.32 bis

Fax Modulation
Modulation Speed
V.21 channel 2300 bps
V.27 ter 2400 bps
V.27 ter 4800 bps
V.297200 bps
V.177200 bps
V.177200 bps with short train
V.299600 bps
V.179600 bps
V.179600 bps with short train
V.1712000 bps
V.1712000 bps with short train
V.1714400 bps
V.1714400 bps with short train

Internal Transmit Clock Frequency
Selected bit rate ± 0.01%

External Transmit Clock Frequency
Selected bit rate ± 0.01%

Transmit Output Level
0 to -30 dBm, selectable.

Operation
4-wire, full-duplex, leased (private) line
2-wire, full-duplex, leased (private) line or PSTN

A-2

V.3600

Specifications

Carrier Detect Level
Dynamic to -43 dBm

Telco Connection
8-pin modular jack, dial and private lines

Testing
511 PN pattern (per V.52) V.54 remote loopback control

Line Equalization
Automatic adaptive

RTS/CTS Delay

From 0 ± 2 ms to 90 ± 2 ms, user selectable in 10 ms increments
(The default is 0 ms.)

Link Layer Protocols
V.42/V.42 bis error correction and compression protocol
MNP levels 2-5 error correction and compression protocol

V.3600

A-3

Appendix B
Phone Jack Descriptions
DIAL Pin Functions
The DIAL jack connects to the PSTN dial-up lines. Pin functions are as
follows:
Pin

Function

1, 2, 3

Not used

4R

Ring side of telephone line

5T

Tip side of telephone line

6, 7, 8

Not used

TELSET/LEASED LINE Pin Functions
The 8-pin TELSET/LEASED LINE jack allows a standard telephone or a
leased line to be connected to the modem. Pin functions are as follows:
Pin

Function

1, 2

Transmit pair - 4-wire leased line or Tx and Rx for 2-wire
leased line

4, 5

Ring and tip (respectively) of telephone line for a telephone

7, 8

Receive pair - 4-wire leased line

V.3600

B-1

Appendix C
Hardware Options
Jumper Option Selection
Modem configuration is controlled by front panel pushbuttons and the
LCD, AT or V.25 bis commands, and one hardware option jumper located
on the PC board. Normally, jumpers do not have to be changed. If a
change is required, remove the modem cover. The jumper diagrams on the
following pages indicate the factory settings.

Removing the Cover

Warning
Disconnect power before removing the cover. Although
dangerous voltage levels are not exposed, disconnecting
power ensures an electrical shock hazard is not present.
1) Place the unit on its side on a flat surface.
2) To disengage the cover’s locks from the the base of the modem,
insert a medium size flat screwdriver blade in one of the slots as
illustrated in Figure C-1. DO NOT PUSH the screwdriver, but pry
the lock open by applying pressure toward the unit.
3) Assist removal by pushing the cover from the base.
4) Repeat this procedure with the remaining three slots.

Modem 3600

C-1

Hardware Options

Bottom of
the modem

Slots - Open the two slots
on one side of the modem
first. Then open the two on
the other side.

Figure C-1. Cover Removal

C-2

Modem 3600

Hardware Options

Figure C-2 shows a typical jumper configuration.

Figure C-2. Jumper Location for Ground Option

Modem 3600

C-3

Hardware Options

Figure C-3 shows a typical jumper configuration.

Figure C-3. Typical Jumper Configuration

Ground Option Jumper
Signal ground is normally connected to chassis ground. If interference
exists, isolate signal ground from chassis ground.

* factory setting

Replacing the Cover
To replace the cover, align the lock clips, rear guide grooves, and front
lock tabs. Press the cover in place until the lock clips engage the lock
prongs.

C-4

Modem 3600

Appendix D
Fault Isolation Procedure
Fault Isolation Procedure
This diagnostic test procedure and the indicator lights built into the
modem allow a rapid check of the terminals, modems, and telephone line
interface. This procedure can be used to verify normal system operation
and to isolate faulty equipment in case of failure.
Ensure the units are turned on and remote loops are enabled at both sites
before starting the fault isolation procedure.
Note
In some cases the observer must distinguish between rapid LED
blinking and steady on in tests.

Telephone Interface
1) Connect the modem to the dial-in line by the LINE jack on the back
panel.
2) If the dial line is installed with a standard data jack, connect a
standard telephone to the TELSET/LEASED LINE jack on the
back panel of the modem and use the standard telephone procedure.

Standard Phone
1) Configure the modem to V.34 33600 IDLE mode by pressing the
TALK/ DATA button, and then lift the receiver. No dial tone is
heard. Press the TALK/DATA button to display V.34 IDLE and
wait for dial tone.
2) Dial out; the phone should operate normally.

Modem 3600

D-1

Hardware Options

Modem and Telephone Line Check
Part I
1) Configure the modem for LOCAL ANALOG LOOP WITH
TEST PATTERN. This terminates the local modem telephone
lines into 600 ohms and connects the local modem transmit
output amplifier back to its own receiver through the AGC.
Transmit input data from the terminal is inhibited and is
substituted with a V.52 test pattern.
2) This test checks operation of the local modem modulator and
demodulator circuitry and should be attempted at both local and
remote sites if operators are available.
3) When random errors are present, the TEST PATTERN ERRORS
display counts receive errors.
4) If the circuitry is working properly, the front panel indicators
show the following:

5) Configure the modem for LOCAL ANALOG LOOP to switch
the transmitter back to its normal data input.
6) If the transmit data input is in a mark hold condition, both the TD
and RD indicators should remain off.
7) If the transmit data input is in a space hold condition, both the
TD and RD indicators should come on. All other indicators
should remain the same.
8) If the indicators are correct, the modem is probably operating
correctly.
9) If the preceding tests were not successful, call Technical
Services. Refer to the “Calling Technical Support” section on
page 12-2.

D-2

Modem 3600

Hardware Options

Part II
This part determines the performance of the local and remote modems
and the telephone circuits. It also determines each modem's ability to
receive a transmitted signal from the other site, properly equalize and
decode the signal and then loop this regenerated signal into the
transmitter for transmission back to the other modem. This test applies
to both leased line and dial line operation.
1) Configure the local modem for REMOTE DIGITAL LOOP
WITH TEST PATTERN. This signals the remote modem to go
into digital loop. The remote modem receives and then
retransmits the data back to the local mode. If the digital bilateral
loop is enabled at the remote, the remote DTE is looped back to
itself.
2) An alternative to the above procedure is to request the operator at
the remote modem to configure his modem for LOCAL
DIGITAL LOOP. Configure the local modem for TEST
PATTERN. The remote modem receives and retransmits the data
back to the local modem.
3) The TEST PATTERN ERRORS display will count received
errors.
4) At the local modem, the indicators should be as follows:

5) To further test the modem and communications link, reverse the
system loopback. First exit the existing loopback test. Reverse
the roles of the local and remote modems and repeat step two.
Note
If the bilateral digital loop is enabled at the local modem, the
DTE interface is looped to itself and permits the DTE to
check the interface circuitry as well as itself.

Modem 3600

D-3

Appendix E
Command Index and Defaults
General
This reference guide provides asynchronous command characters and
their descriptions. The pages listed provide initial information on the
commands. The S-registers listed are cross references (see the“Status
Registers” section on page -21).
Note
Bold text indicates command parameter defaults.
Command Page

S-Reg

Description

AT

page 5- -3

Attention code - command prefix

A/

page 5- -4

Repeat last command

+++

page 5- S2,
22
S12

Escape sequence (pause, + + +, pause)

A

page 5- -17

Answer

D

page 5- -13,
page 94

Dial

Dial Modifiers:
T
P
,

page 5- S14
14
S14
S8

Tone dial
Pulse dial
Long pause (2 sec or S8 value)

† cannot be executed from remote configuration mode

Modem 3600

E-1

Hardware Options

Command Page
W
!

S-Reg

page 5- S7
14
--

Description
Wait for 2nd dial tone (S7 value)
Flash switchboard

R

--

Switch to answer mode after dialing

;

--

Return to command mode after dialing

@
Sn
E
E1
H
H1

page 5- -15
--

Wait for 5 seconds of silence

page 5- S14
22
S14

Local character echo off

page 5- -23
--

Hang up †

Dial stored command line
Local character echo on
Forces modem off hook †

H2

S14

Set H command to V.32 †

H3

S14

Set H command to fast †

I
I1

page 5- -24
--

I3

--

Request product version

I4

--

Returns Modem 3600

I5
L, L1, L2

--

Request product code
Request EPROM CRC value

Disconnect reason

page 5- S22
24
S22

Speaker volume low
Speaker off

M1

page 5- S22
24
S22

M2

S22

Speaker always on

M3

S22

Speaker off when dialing and carrier is
present

L3
M

O
O1
Q

page 5- -25
--

Q1

page 5- S14
6
S14

Q2

S14

Speaker volume high
Speaker off when carrier is present

Restore data mode (after escape) †
Retrain and restores data mode (after
escape) †
Response displays on
Response displays off
Response displays on in originate mode
only

† cannot be executed from remote configuration mode

E-2

Modem 3600

Hardware Options

Command Page
Sn?

S-Reg

Sn?^

page 10 --3
--

Sn=v

--

Description
Read value in register n (decimal)
Read value in register n
(hexadecimal)
Set v (value) in register n (decimal)

Sn=v^

page 10 --3

Set v (value) in register n
(hexadecimal)

Sn.#=v

page 10 --4

Set single bit value in register n,#= bit
position 0-7, v = bit value 1 or 0

V

page 5- S14
6
S14

Response codes

page 5- S82
6
S82

Negotiation display disabled

W1
W2

S82

Displays DCE link rate

X

S22

CONNECT (code 1), for all speeds, no
dial tone or busy signal detection

X1

S22

Appropriate connect codes for rate, no
dial tone detection

X2

S22

Wait for dial tone (appropriate
connect codes)

X3

S22

Detect busy signal (appropriate
connect codes)

X4

S22

Wait for dial tone, detect busy signal
(appropriate connect codes)

V1
W

Y
Y1
Z
Z1
&C

Response messages
Negotiation display enabled

page 5- S21
25
S21

Long space disconnect disabled

page 5- -39
--

Reset to user option set #1 †

Long space disconnect enabled
Reset to user option set #2 †

&C1

page 5- S21
19
S21

DCD always on

&C2

S21

DCD off 5 seconds after disconnect

&C3

S21

DCD follows remote RTS

DCD on while carrier is present

† cannot be executed from remote configuration mode

Modem 3600

E-3

Hardware Options

Command Page
&D

S-Reg

&D1

page 5- S21
20
S21

&D2

S21

&D3

page 5- S21
20

Description
DTR ignored
DTR recalls command mode
DTR disconnects
DTR disconnects and resets modem to
stored configuration

&F or &F1 page 5- -39
&F2
--

Restore factory configuration 2 †

&F3

--

Restore factory configuration 3 †

&F4

--

Restore factory configuration 4 †

&F5

--

Restore factory configuration 5 †

&F6

--

Restore factory configuration 6 †

&F7

--

Restore factory configuration 7 †

&F8

--

Restore factory configuration 8 †

&F9

--

Restore factory configuration 9 †

&G
&G1

page 5- S23
25
S23

&G2

S23

&L
&L1
&L2

page 5- S27
36
S27,
S32
S27,
S32

Restore factory configuration 1 †

No guard tone
550 Hz tone
1800 Hz tone
Dial line †
Leased line 2-wire †
Leased line 4-wire †

† cannot be executed from remote configuration mode

E-4

Modem 3600

Hardware Options

Command Page
&M

S-Reg

page 5- S27,
25
S30

Description
Asynchronous dial / asynchronous data

&M1

S27

Asynchronous dial / synchronous data

&M2

S27

Dials stored number when DTR off / on
transition is detected / sync data

&M3

S27

Manual dial / sync data

&M4

S30

V.25 bis autodialer with BISYNC
protocol / sync data

&M5

S30

V.25 bis autodialer with SDLC protocol
/sync data

&M6

S30

V.25 bis async dialer / sync data

&M7

--

V.25 bis async dialer / async data

&M8

page 5- -25

&M9

--

V.25 bis async dialer / SDLC protocol/
sync data (EBCDIC, NRZ)

&M10

--

V.25 bis async dialer / SDLC protocol/
sync data (ASCII, NRZ1)

&M11

--

V.25 bis async dialer / sync data
(EBCDIC, NRZ1)

&P
&P1
&R
&R1

V.25 bis async dialer / BISYNC
protocol / sync data (EBCDIC)

page 5- S22
26
S22

39/61 pulse make / break ratio

page 5- S21
21
S21

CTS normal operating state

33/67 pulse make / break ratio
CTS forced on

&R2

S72

CTS follows DCD

&R9

S72

CTS equals RTS

&S
&S1

page 5- S21
20
S21

DSR always on
DSR on when ready to accept data

&S2

S21

DSR off for 5 seconds after disconnect

&S3

S21

DSR follows off hook (OH)

&T

page 7- -2

Terminate current test †

† cannot be executed from remote configuration mode

Modem 3600

E-5

Hardware Options

Command Page

S-Reg

Description

&T1

page 7- -3

Initiate analog loopback †

&T3

page 7- -5

Initiate digital loopback †

&T4

page 7- S23
6

Grant remote commanded digital
loopback †

&T5

S23

Denies remote commanded digital
loopback †

&T6

--

Initiate remote digital loopback †

&T7

page 7- -7

&T8

page 7- -4

Initiate self test analog loopback †

&V

page 5- -40

View configuration profiles

&V1

page 5- -40
--

Display received signal status

page 5- -38

Store current configuration to user
option set #1

--

Store current configuration to user
option set #2

&V2
&W
&W1
&X

Initiate self test remote digital loopback
†

Display active profile

Internal clock

&X1

page 5- S27
27
S27

&X2

S27

Receive clock

&Y
&Y1
&Y?
&Zn=x

page 5- -38
--page 5- -40

External clock
Powerup with user option set #1
Powerup with user option set #2
Display powerup option set
Store dial string x to location n
(n=0-9)

† cannot be executed from remote configuration mode

E-6

Modem 3600

Hardware Options

Command Page
%A
%An
%B

S-Reg

page 6- S64
6
S64

Description
Disable auto-reliable fallback
character
Set auto-reliable fallback character to n
(n = ASCII 1-127) †

%B1

page 5- S69
28
S69

Use DTE speed/maximum DCE speed

%B2

S69

1200 bps max

%B3

S69

2400 bps max

%B4

S69

4800 bps max

%B5

S69

9600 bps uncoded max

%B6

S69

9600 bps max

%B7

S69

7200 bps max

%B8

S69

12000 bps max

%B9

S69

14400 bps max

%B10

S69

600 bps

%B11

S69

16800 bps max

300 bps max

%B12

S69

19200 bps max

%B13

21600 bps max

%B14

page 5- S69
28
S69

%B15

S69

26400 bps max

%B16

S69

28800 bps max

%B17

S69

31200 bps max

%B18

S69

33600 bps max

%C

24000 bps max

%C1

page 6- S56
12
S56

Compression disabled

%C2

S56

Compression enabled on transmit data
only

%C3

S56

Compression enabled on receive data
only

Compression enabled on transmit and
receive data

† cannot be executed from remote configuration mode

Modem 3600

E-7

Hardware Options

Command Page
%D

S-Reg

Description

page 6- S62
4
S62

Disable disconnect buffer delay

page 5- S60
30
S60

Disable auto retrain
Disabled minimum DCE speed

%L1

page 5- S81
29
S81

%L2

S81

1200 bps min

%L3

S81

2400 bps min

%L4

S81

4800 bps min

%L5

S81

9600 bps uncoded min

%L6

S81

9600 bps min

%L7

S81

7200 bps min

%L8

S81

12000 bps min

%L9

S81

14400 bps min

%L10

S81

600 bps

%L11

S81

16800 bps min

%L12

S81

19200 bps min

%Dn
%E
%E1
%L

Set disconnect buffer delay in seconds n
(n = 1-255)
Enable auto retrain
Disabled

%L13

S81

21600 bps min

%L14

24000 bps min

%L15

page 5- S81
29
S81

%L16

S81

28800 bps min

%L17

S81

31200 bps min

%L18

S81

33600 bps min

%P1=pw
%P1=D
%P1?

page 5- -41
---

26400 bps min

Set software download password
Disable software download
Display software download password

† cannot be executed from remote configuration mode

E-8

Modem 3600

Hardware Options

Command Page
%R

S-Reg

Description

%R1

page 5- S53
30
S53

Disable automatic rate adaption

%R2

S53

Enable automatic rate adaption medium
BER

%R3

S53

Enable automatic rate adaption using
high BER

Enable automatic rate adaption low
BER

%T

page 7- -7

Transmit test pattern †

%T=

page 5- -43

Followed by a remote configuration
security code, establishes remote
configuration †

%V

page 5- -31

Display product revision level

\A
\A1

page 6- S63
11
S63

\A2

S63

Maximum block size of 192
characters

\A3

S63

Maximum block size of 256
characters

\B
\Bn
\C
\C1
\G
\G1

Maximum block size of 64 characters
Maximum block size of 128
characters

page 6- S79
11
S79

Transmit a break signal

page 6- S60
11
S60

Disable auto-reliable buffer

page 6- S54
8
S54

Sets break length in 20 ms increments,
n=1-255, default is 35 (700 ms)
Buffer data for 4 seconds or 200
characters
Disable modem port flow control
Enable modem port XON/XOFF flow
control

† cannot be executed from remote configuration mode

Modem 3600

E-9

Hardware Options

Command Page
\J

S-Reg

page 6- S72
5

Description
Disable slaved DTE/DCE speed
(constant speed DTE on)

\J1

S72

Enable slaved DTE/DCE speed
(constant speed DTE off)

\J2

--

Enable 230.4 kbps DTE speed

\J3

--

Disable 230.4 kbps DTE speed

Note
The 230.4 kbps DTE speed is available, but the DTE will not
autobaud to 230.4 kbps. With the modem set for 115.2 kbps,
enter AT\J2 to enable the speed, and reset the DTE for 230.4
kbps. When the modem is set for 230.4 kbps, enter AT\J3 to
disable it if needed. Reset the DTE for 115.2 kbps.
\Kn

page 6- S59
9

Selects action when encountering a
break

\K

S59

Break option 0

\K1

S59

Break option 1

\K2

S59

Break option 2

\K3

S59

Break option 3

\K4

S59

Break option 4

\K5

S59

Break option 5

\M
\M1
\N
\N1
\N2

page 6- S70
5
S70

V.42 fast detect data sequence disabled
V.42 fast detect data sequence enabled

page 6- S70
6
S70

Direct mode

Normal mode

\N3

page 6- S70
6
S70

MNP only

\N4

S70

LAPM only

\N5

S70

LAPM with normal fallback

\N6

S70

LAPM with MNP fallback

\N7

S70

LAPM with MNP and normal fallback

MNP or normal

† cannot be executed from remote configuration mode

E-10

Modem 3600

Hardware Options

Command Page
\Q

S-Reg

Description

\Q1

page 6- S54
7
S54

\Q2

S54

Enable CTS flow control to the DTE

\Q3

S54

Enables bilateral CTS/RTS flow
control

\Q4

S54

Disable DCE flow control

\Q5

S54

Enable DCE XON/XOFF flow
control

\Q6

S54

Enable CTS flow control to the DTE

\Q7
\R
\R1
\T
\Tn
\V
\V1
\X
\X1
*AS

S54
page 5- S60
21
S60

Disable DTE flow control
Enable DTE XON/XOFF flow
control

Enable CTS flow control to the DTE
Ring indicate, blinks for ring and
remains on for duration of call
Ring indicate, blinks for ring and turns
off when call is answered

page 6- S58
10
S58

Disable inactivity timer

page 5- S60
6
S60

Disable protocol result codes

page 6- S54
8

No XON/XOFF characters to remote
DCE

S54

Set inactivity timer to n (n = 1-255
minutes)
Enable protocol result codes

Pass XON/XOFF characters to remote
DCE

page 5- -27
--

Disable V.34 asymmetric bit rate

*AUn

page 5- -16

Dial number stored at location n upon
transition of DTR in command mode
(n = 1-9)

*CNx,n

page 5- -40

Store phone number n in location x
(x = 1-9)

*AS1

Enable V.34 asymmetric bit rate

† cannot be executed from remote configuration mode

Modem 3600

E-11

Hardware Options

Command Page
*DA
*DA1
*DB
*DB1
*DG
*DG1
*FB
*FB1
*FT
*FT1
*IC
*LA

S-Reg

page 5- -32
--

Description
Switches modem to talk mode †
Switches modem to data mode †

page 5- S32
36
S32

Manual dial backup operation

page 7- S34
7
S34

Disables bilateral digital loop

page 5- S29
22
S29

Ignore pin 23

page 5- S29
32
S29
--

Automatic dial backup operation
Enables bilateral digital loop
Pin 23 transition causes DTE speed
fallback
Disable fast train
Enable fast train
Disregard incoming call

page 7- S34
8
S34

Ignore pin 18

*LB

page 5- -36

Return to leased line from dial backup†

*LC

page 5- S32
32
S32

Line current disconnect disabled

*LC1
*LC2

S32

*LA1

DTE commanded LAL enabled

Short (8 ms) line current disconnect
Long (90 ms) line current disconnect

*LD

page 5- -36

Manual dial backup

*MM

Automode (modulation)

*MM1

page 5- -27
--

*MM2

--

Bell 103J

*MM3

--

Reserved

*MM4

--

Bell 212A

V.21

*MM5

--

V.22 bis

*MM6

--

V.27 bis 4-wire leased only

† cannot be executed from remote configuration mode

E-12

Modem 3600

Hardware Options

Command Page
*MM7

S-Reg

Description

*MM8

page 5- -27
--

Reserved

*MM9

--

Reserved

*MM10

--

V.33 4-wire leased only

*MM11

--

V.32 bis

*MM12

--

V.34

V.29 4-wire leased only

*ND

page 5- -40

Displays the nine stored numbers

*NT

page 5- S29
33
S29

AT command set disabled

*NT1
*OR
*OR1
*RC
*RC1
*RD
*RD1
*RO
*RO1
*RR

AT command set enabled

page 5- S14
36
S14

Originate

page 5- S57
8
S57

15 - 4800 bps, 18 - 9600 bps
11 - 4800 bps, 12 - 9600 bps

page 7- S34
8
S34

DTE commanded RDL enabled

page 5- S29
41
S29

Forced answer

Ignore pin 21
Retain options at disconnect
Restore options at disconnect

*RR1

page 5- -31
--

Rate negotiate to 4800 †

Rate negotiate to 2400 †

*RR2

--

Rate negotiate to 7200 †

*RR3

--

Rate negotiate to 9600 †

*RR4

--

Rate negotiate to 12000 †

*RR5

--

Rate negotiate to 14400 †

*RR6

--

Rate negotiate to 16800 †

*RR7

--

Rate negotiate to 19200 †

*RR8

--

Rate negotiate to 21600 †

*RR9

--

Rate negotiate to 24000 †

*RR10

--

Rate negotiate to 26400 †

*RR11

--

Rate negotiate to 28800 †

*RR12

--

Rate negotiate to 31200 †

† cannot be executed from remote configuration mode

Modem 3600

E-13

Hardware Options

Command Page

S-Reg

Description

*RR13

page 5- -31

Rate negotiate to 33600 †

*TDn

page 5- S51
33

Sets dial transmit level -10 to -30 dBm

*TH

page 5- S97
27

Low V.34 rate selection threshold
(10-6 BER)

*TH1

S97

Medium V.34 rate selection threshold
(10-4 BER)

*TH2

S97

High rate selection threshold
(10-2 BER)

*TLn

page 5- S52
36

Sets leased line transmit level to n
where n is a number between 0 and 30
corresponding to 0 to -30 db †

$H

page 5- -32
--

Online quick reference

$H=
string
$V

--

$Y

page 5- -41

Online quick reference for string
Display product serial number
Enable soft download flash

† cannot be executed from remote configuration mode

E-14

Modem 3600

Hardware Options

Caller ID Commands
Command Page
*ID
*ID1

S-Reg

page 5- -17
--

Description
Disable Caller ID
Enable Caller ID

Distinctive Ring Commands
Command Page
*DR
*DR=1

S-Reg

page 5- S53
18
S53

Description
Disable Distinctive Ring
Enable Distinctive Ring

Fax Commands
Fax Command

Page

+FCLASS=0

page 9- Service Class 0 (data modem) †
6
Service Class 1 (fax modem) †

+FCLASS=1
+FCLASS?

Display current Service Class settin g †

+FCLASS=?
+FAA=
*FR

Description

Display available Service Class settings †
page 9- Enables fax auto answer function
10
Fax auto answer DTE autobaud forced to
>=19200

*FR1

Fax auto answer DTE autobaud forced to
=19200

*FR?

Display option status

* Cannot executed from remote configuration

Class 1 Commands Valid in Only Fax Mode
Command

Page Description

+FTH=(MOD)

page
9-9

Transmit HDLC data with (MOD) carrier *

+FRH=(MOD)

page
9-9

Receive HDLC data with (MOD) carrier *

+FRM=(MOD)

page
9-8

Receive data with (MOD) carrier *

+FRS=(Time)

page
9-7

Waits for silence (10 ms intervals, 0-255) *

Modem 3600

E-15

Hardware Options

Command

Page Description

+FTM=(MOD)

page
9-8

Transmit data with (MOD) carrier *

+FTS=(Time)

page
9-6

Stop transmission and pause (10 ms
intervals, 0-255) *

* cannot be executed from remote configuration
NOTE: The (MOD) parameter can be one of the following values: 0 or

ValueModulationSpeed
3V.21 channel 300 bps
24V.27 ter2400 bps
38V.27 ter4800 bps
72V.297200 bps
73V.177200 bps
74V.177200 bps with short train
96V.299600 bps
97V.179600 bps
98V.179600 bps with short train
121V.1712000 bps
122V.1712000 bps with short train
145V.1714400 bps
146V.1714400 bps with short train
+FTx=?
+FRx=?

+FCERROR

E-16

page
9-9

Check range for values supported where x
may be M, S, or H. If x is M or H, the modem
returns 3, 24, 48, 72, 73, 96, 97, 98, 121,
122, 145, 146. If x is S, the modem returns
0-255.
Carrier different from specified in +FRM or
+FRH

Modem 3600

Hardware Options

Security Commands
Command Page

Description

Low Security
$S=x
$C=x,y

page 8- Sets an empty password location to x
4
Changes either password where x represents the
old password and y is the new one

$C=x,-

Deletes password x from memory

$DR

Reset security

$D=x

Disables security where x is either password

$D? or $E?

Displays the current status of security

$E=x

Enables security where x is either password

High Security
$Cn=m

page 8- Set user callback number. n = user number and
8
m = the callback number

$D

page 8- Disable security
7

$E? or $D? page 8- Display current security status
10
$EH=pw

page 8- Enable security (pw = superuser password) †
7

$F=
pw$pw

page 8- Reinitialize security
10

$IBn

page 8- Display user information for a block of up to
11
ten valid users (n = first user number)

$In
$Ln=m

Display user information (n = user number)
page 8- Set security level for the user specified by n (m
8
= security level)

$M

Display illegal attempts information

$M*

Reset illegal attempts registers/restore
suspended users to normal status

$Mn

Reset illegal attempts registers and restore
suspended user n to normal status

†cannot be executed from remote configuration mode

Modem 3600

E-17

Hardware Options

$Pn=
pw$pw

page 8- Set user password; n = user number and new
8
password (n = 0 for superuser pw = password)

$Rn

page 8- Remove a user (n = user number)
10

$S?

page 8- Display current user status (superuser / user)
10

$W0

page 8- Disable user changes (password and callback
9
number) †

$W1

Enable user changes (password and callback
number) †

$W2

Enable remote superuser †

$W?

Display user changes remote superuser option
status

$$

page 8- Local logoff
11

$n=pw

page 8- Local logon (n = user number and pw =
11
password)
page 811

$S=pw

page 8- Request to enter superuser status (pw =
11
password)

†cannot be executed from remote configuration mode

E-18

Modem 3600

Hardware Options

Remote Configuration Commands
Command

Page

Description

%P=n

page
5-42

Set remote configuration security code to value
n (0 to 99999999)

%P?

Display local modem remote configuration
security code

%P=
(blank)

Clear security code

*RA
*RA1

page
5-44

Disable remote configuration
Enable remote configuration

*RB

Remote configuration DTE speed = 300 bps

*RB1

Remote configuration DTE speed = 600 bps

*RB2

Remote configuration DTE speed = 1200 bps

*RB3

Remote configuration DTE speed = 2400 bps

*RB4

Remote configuration DTE speed = 4800 bps

*RB5

Remote configuration DTE speed = 7200 bps

*RB6

Remote configuration DTE speed = 9600 bps

*RB7
*RB8

page
5-44

Remote configuration DTE speed = 12000 bps
Remote configuration DTE speed = 14400 bps

*RB9

Remote configuration DTE speed = 16800 bps

*RB10

Remote configuration DTE speed = 19200 bps

*RB11

Remote configuration DTE speed = 21600 bps

*RB12

Remote configuration DTE speed = 24000 bps

*RB13

Remote configuration DTE speed = 26400 bps

*RB14

Remote configuration DTE speed = 28800 bps

*RB15

Remote configuration DTE speed = 28400 bps

*RB16

Remote configuration DTE speed = 57600 bps

*RB17

Remote configuration DTE speed = 115200 bps

Modem 3600

E-19

Hardware Options

Command

Page

Description

*RF

page
5-44

7 data bits, no parity, 2 stop bits

*RF1

7 data bits, mark parity, 1 stop bit

*RF2

7 data bits, odd parity, 1 stop bit

*RF3

7 data bits, even parity, 1 stop bit

*RF4

8 data bits, mark parity, 1 stop bit

*RF5

8 data bits, no parity, 1 stop bit

*RF6

8 data bits, odd parity, 1 stop bit

*RF7

8 data bits, even parity, 1 stop bit

*RQ
*RQ1

E-20

page
5-45

Exit remote configuration, save new
configuration
Exit remote configuration, discard new
configuration

Modem 3600

Hardware Options

Status Registers
Default
Factory Set
#1

S-Reg

RO/
RW

S0

RW

S1

RO

S2

RW

Escape sequence character

S3

RW

End-of-line character

13 (CR)

S4

RW

Line-feed character

10 (LF)

S5

RW

S6

RW

Page

Function

page 1 Ring to answer
0-4
Ring count

page 1 Backspace character
0-5
Pause before blind dialing

1
0
43 (+)

8 (BS)
2 (2 sec)

S7

RW

Pause for carrier

30 (30 sec)

S8

RW

Pause for comma

2 (2 sec)

S9

RW

Carrier validation

6 (0.6 sec)

S10

RW

Loss carrier delay time

14 (1.4 sec)

S11

RO

S12

RW

page 1 DTMF tone duration
0-6
Escape sequence pause

S14

RW

page 1 Bit mapped
0-7

8A hex

S16

RO

0

S18

RW

page 1 System tests
0-8
Test timer

S21

RW

page 1 Bit mapped
0-9

B4 hex

S22

RW
RW

page 1 Bit mapped
0-10
Bit mapped

46 hex

S23
S25

RW

5 (0.5 sec)

S26

RW

page 1 DTR recognition time
0-11
RTS/CTS delay

S27

RW

Bit mapped

0

S28

RW

Lookback timer

15 min

S29

RW

S30

RW

page 1 Bit mapped
0-12
V.25 mode selection

80 ms
50 (1 sec)

0

01 hex
0

0
0

RO=Read only RW=Read or write

Modem 3600

E-21

Hardware Options

Default
Factory Set
#1

S-Reg

RO/
RW

S32

RW

S34

RW

S35

RW

Default dial number

S41

RW

page 1 Remote configuration escape
0-13
character

S42

RW

Remote configuration guard
time

32 hex

S44

RW

DTE XON character

11 hex

S45

RW

DTE XOFF character

13 hex

S49

RW

DCE XON character

11 hex

S50

RW

DCE XOFF character

13 hex

S51

RW

Dial transmit level

10

S52

RW

S53

RW

S54

Page

Function

page 1 Bit mapped
0-13
Bit mapped

06 hex
60 hex
1
3d hex

page 1 Lease transmit level
0-15
Bit mapped

0

RW

page 1 Bit mapped
0-16

63 hex

S56

RW

03 hex

S57

RW

page 1 V.42 compression
0-17
Bit mapped

S58

RW

S59

RW

S60

RW

S61

RO

S62

RW

S63

RW

S64

RW

S67

RO

S69

RW

Inactivity timer
page 1 MNP break control
0-18
Bit mapped
page 1 DTE word length, parity
0-19
Disconnect buffer delay

0
0
5
5b hex
18 hex
0

Maximum protocol block size 255
page 1 Auto-reliable character
0-20
Link speed status

0

page 1 Maximum DCE speed
0-22

18

RO=Read only RW=Read or write

E-22

0

Modem 3600

0

Hardware Options

S-Reg

RO/
RW

Page

Function

Default
Factory Set
#1

S70

RW

S71

RO

S72

RW

S73

RW

S74

RW

S75

RW

S76

RW

S77

RW

S78

RW

S79

RW

S80

RO

page 1 Serial port speed
0-26

20

S81

RW

1

S82

RW

page 1 Minimum DCE rate
0-27
Bit mapped

S84

RO

page 1 Negotiation status
0-28
Modulation type

0

page 1 Current modulation
0-29
V.34 settings

0

S88

RW

S91

RW

S95

RW

S96

RW

S97

RW

page 1 Protocol operating mode
0-23
Protocol operating mode
status

0f hex

page 1 Bit mapped
0-24
Password timeout security

0

Callback delay
Callback retry
page 1 Callback retry delay
0-25
Lockout threshold
Autocallback timer
Break length

page 1 V.34 settings
0-30
Bit mapped

0

0
15
0
15
0
30
35

0 hex
0
f3 hex
a0 hex
06 hex

RO=Read only RW=Read or write

Modem 3600

E-23

Hardware Options

V.25 bis Dialer Commands
Synchronous
Command

Page

Description

CIC

page
11-8

Connect incoming call command

CRN nn...n

page
11-5

Dial command (nn...n = number to be dialed)

0-9

DTMF and pulse digit

*#

DTMF digit

W

Wait for second type of dial tone

>

Pause for 1 second

=

Pause for 3 seconds

<

Pause for programmed delay time

P

Pulse dial

T

Tone dial

&

Flash (go on hook) for 1/2 second

;

Parameter separator

Space, dash,
parenthesis,
period

page
11-4

Clarity characters

CRRn

page
11-8

Redial the last number a maximum of n times

CRSa

page
11-6

Dial stored number command (a = address)

DIC

page
11-7

Disregard incoming call command

PRK

page Save current option settings
11-12

PRLa;b

page
11-8

Link number at address a with number at
address b

PRNa; nn...n

page
11-5

Program number command (nn...n = number
to be dialed, a = address)

PROxxx;yy;0;
0...

page Program options command (xxx = register
11-10 address, yy = option count)

E-24

Modem 3600

Hardware Options

Synchronous
Command

Page

Description

PRPn

page Restores current option settings to the factory
11-12 defaults in default bank n (1-9)

RLL

page
11-9

Request list of linked numbers command

RLN

page
11-7

Request list of stored numbers command

RLOxxx;yy

page Request list of stored options command
11-13 (xxx = register address, yy = option count)

RLV

page Request list of version information command
11-10

Modem 3600

E-25

Hardware Options

V.25 Response Messages
Response Message

Meaning

CFIAB

Call failure - answer back tone but no
connection

CFIDT

Call failure - no dial tone

CFIET

Call failure - reorder or busy

CFILD

Call failure - link list complete

CFINS

Call failure - number not stored

CFINT

Call failure - no answer back tone, no
ringback

CFIRT

Call failure - timeout occurred

CNX @ 33600 bps

Intermediate call progress - connection
made at 33600

CNX @ 31200 bps

Intermediate call progress - connection
made at 31200

CNX @ 28800 bps

Intermediate call progress - connection
made at 28800

CNX @ 26400 bps

Intermediate call progress - connection
made at 26400

CNX @ 24000 bps

Intermediate call progress - connection
made at 24000

CNX @ 21600 bps

Intermediate call progress - connection
made at 21600

CNX @ 19200 bps

Intermediate call progress - connection
made at 19200

CNX @ 16800 bps

Intermediate call progress - connection
made at 16800

CNX @ 14400 bps

Intermediate call progress - connection
made at 14400

CNX @ 12000 bps

Intermediate call progress - connection
made at 12000

CNX @ 9600 bps

Intermediate call progress - connection
made at 9600

E-26

Modem 3600

Hardware Options

Response Message

Meaning

CNX @ 7200 bps

Intermediate call progress - connection
made at 7200

CNX @ 4800 bps

Intermediate call progress - connection
made at 4800

CNX @ 2400 bps

Intermediate call progress - connection
made at 2400

CNX @ 1200 bps

Intermediate call progress - connection
made at 1200

INC

Incoming ring detected

INVCU

Invalid command - command unknown

INVMS

Invalid command - message syntax error

INVPS

Invalid command - parameter syntax
error

INVPV

Invalid command - parameter value error

VAL

Valid command received

Modem 3600

E-27

Hardware Options

Factory Option Sets
Factory Option Set #1
(Asynchronous Dial-up with V.42 bis Protocol)
(AT&F or AT&F1)
MODEM OPTIONS
DCE rate - 33600
Modulation automode
V.34 rate threshold high
V.34 asymmetric rate enabled
Normal originate
Fast train disabled
Auto retrain enabled
SQ auto rate disabled
Transmit clock internal
Dial line
Jack type RJ11
Line current disconnect long
Long space disconnect enabled
V.22 guard tone disabled
PROTOCOL OPTIONS
LAPM protocol enabled
MNP protocol enabled
Protocol fallback enabled
Data compression normal
Constant DTE speed
DTE flow control RTS
DCE flow control CTS
XON/XOFF pass through disabled
Inactivity timer off
Break control 5
V.42 fast detect enabled

TEST OPTIONS
Bilateral digital loop disabled
DTE local test disabled
DTE remote test disabled
Remote commanded test enabled
Test timeout off
DIAL LINE OPTIONS
Tone dial
Auto dial #1
Wait for dial tone
Wait delay 2 seconds
Pause delay 2 seconds
Call timeout 30 seconds
Answer on 1 ring
Autocallback disabled
DTE OPTIONS
Async data
DTE rate - 115200
8 bit, no parity
Async controlled dialer
AT command set enabled
DTR disconnects
DSR forced high
DCD normal
CTS forced high
DTE fallback disabled
Options retained at disconnect

SPEAKER OPTIONS
Volume low
On until carrier detect

E-28

Modem 3600

Hardware Options

Factory Option Set # 2
(Asynchronous Dial-up without V.42 bis Protocol)
(AT&F2)
MODEM OPTIONS
DCE rate - 33600
Modulation automode
V.34 rate threshold low *
V.34 asymmetric rate enabled
Normal originate
Fast train disabled
Auto retrain enabled
SQ auto rate disabled
Transmit clock internal
Dial line
Jack type RJ11
Line current disconnect long
Long space disconnect enabled
V.22 guard tone disabled

TEST OPTIONS
Bilateral digital loop disabled
DTE local test disabled
DTE remote test disabled
Remote commanded test enabled
Test timeout off
DIAL LINE OPTIONS
Tone dial
Auto dial #1
Wait for dial tone
Wait delay 2 seconds
Pause delay 2 seconds
Call timeout 30 seconds
Answer on 1 ring
Autocallback disabled

PROTOCOL OPTIONS
DTE OPTIONS
LAPM protocol disabled *
Async data
MNP protocol disabled *
DTE rate - 115200
Normal buffer mode *
8 bit, no parity
Constant DTE speed
Async controlled dialer
DTE flow control disabled *
AT command set enabled
DCE flow control disabled *
DTR disconnects
XON/XOFF pass through disabled *DSR forced high
Inactivity timer off
DCD normal
Break control 0 *
CTS forced high
V.42 fast detect disabled *
DTE fallback disabled
Options retained at disconnect
SPEAKER OPTIONS
Volume low
On until carrier detect
*Indicates variation from factory option set #1

Modem 3600

E-29

Hardware Options

Factory Option Set #3
(Synchronous Dial-up)
(AT&F3)

MODEM OPTIONS
DCE rate - 33600
Modulation automode
V.34 rate threshold low *
V.34 asymmetric rate disabled *
Normal originate
Fast train disabled
Auto retrain enabled
SQ auto rate disabled
Transmit clock internal
Dial line
Jack type RJ11
Line current disconnect long
Long space disconnect disabled *
V.22 guard tone disabled
PROTOCOL OPTIONS
LAPM protocol disabled *
MNP protocol disabled *
Direct buffer mode *
DTE flow control disabled *
DCE flow control disabled *
XON/XOFF pass through disabled
Inactivity timer off
Break control 0 *
V.42 fast detect disabled *

TEST OPTIONS
Bilateral digital loop disabled
DTE local test disabled
DTE remote test disabled
Remote commanded test enabled
Test timeout off
DIAL LINE OPTIONS
Tone dial
Auto dial #1
Wait for dial tone
Wait delay 2 seconds
Pause delay 2 seconds
Call timeout 30 seconds
Answer on 1 ring
Autocallback disabled
DTE OPTIONS
Sync data *
Dial method manual *
AT command set disabled *
DTR disconnects *
DSR normal *
DCD normal
CTS follows RTS *
RTS/CTS delay 0 ms *
DTE fallback disabled
Options retained at disconnect

SPEAKER OPTIONS
Volume low
On until carrier detect
*Indicates variation from factory option set #1

E-30

Modem 3600

Hardware Options

Factory Option Set # 4
(Synchronous 4-wire Leased Line)
(AT&F4)
MODEM OPTIONS
DCE rate - 33600
V.34 modulation *
V.34 rate threshold low *
V.34 asymmetric rate disabled *
Normal originate
Fast train disabled
Auto retrain enabled
SQ auto rate disabled
Transmit clock internal
Leased line *
4-wire *
Transmit level - 0 dBm *
Dial backup manual *
Lookback timer - 15 min *
Jack type RJ11
Line current disconnect long
Long space disconnect enabled
V.22 guard tone disabled

TEST OPTIONS
Bilateral digital loop enabled *
DTE local test disabled
DTE remote test disabled
Remote commanded test enabled
Test timeout off
DIAL LINE OPTIONS
Tone dial
Auto dial #1
Wait for dial tone
Wait delay 2 seconds
Pause delay 2 seconds
Call timeout 60 seconds *
Answer on 1 ring
Autocallback disabled

DTE OPTIONS
Sync data *
AT command set disabled *
PROTOCOL OPTIONS
Ignores DTR *
LAPM protocol disabled *
DSR normal *
MNP protocol disabled *
DCD normal
Direct buffer mode *
CTS follows RTS *
DTE flow control disabled *
RTS/CTS delay 0 ms *
DCE flow control disabled *
DTE fallback disabled
XON/XOFF pass through disabled Options retained at disconnect
Inactivity timer off
Break control 0 *
V.42 fast detect disabled *
SPEAKER OPTIONS
Volume low
On until carrier detect

*Indicates variation from factory option set #1

Modem 3600

E-31

Hardware Options

Factory Option Set #5
(Asynchronous 4-wire Leased Line withV.42bis Protocol)
(AT&F5)
MODEM OPTIONS
DCE rate - 33600
V.34 modulation *
V.34 rate threshold high
V.34 asymmetric rate enabled
Normal originate
Fast train disabled
Auto retrain enabled
SQ auto rate disabled
Transmit clock internal
Leased line, 4-wire *
Transmit level - 0 dBm *
Dial backup manual *
Lookback timer - 15 min *
Jack type RJ11
Line current disconnect long
Long space disconnect enabled
V.22 guard tone disabled

TEST OPTIONS
Bilateral digital loop disabled
DTE local test disabled
DTE remote test disabled
Remote commanded test enabled
Test timeout off
DIAL LINE OPTIONS
Tone dial
Auto dial #1
Wait for dial tone
Wait delay 2 seconds
Pause delay 2 seconds
Call timeout 30 seconds
Answer on 1 ring
Autocallback disabled

DTE OPTIONS
Async data
PROTOCOL OPTIONS
DTE rate - 115200
LAPM protocol enabled
8 bit, no parity
MNP protocol disabled *
AT command set enabled
Protocol fallback disabled *
Ignores DTR *
Data compression normal
DSR forced high
Constant DTE speed
DCD normal
DTE flow control RTS
CTS forced high
DCE flow control CTS
DTE fallback disabled
XON/XOFF pass through disabled Options retained at disconnect
Inactivity timer off
Break control 5
V.42 fast detect enabled
SPEAKER OPTIONS
Volume low
On until carrier detect
*Indicates variation from factory option set #1

E-32

Modem 3600

Hardware Options

Factory Option Set # 6
(Asynchronous 4-wire Leased Line withoutV.42bis Protocol)
(AT&F6)
MODEM OPTIONS
DCE rate - 33600
V.34 modulation *
V.34 rate threshold low *
V.34 asymmetric rate enabled
Normal originate
Fast train disabled
Auto retrain enabled
SQ auto rate disabled
Transmit clock internal
Leased line, 4-wire *
Transmit level - 0 dBm *
Dial backup manual *
Lookback timer - 15 min *
Jack type RJ11
Line current disconnect long
Long space disconnect enabled
V.22 guard tone disabled

TEST OPTIONS
Bilateral digital loop disabled
DTE local test disabled
DTE remote test disabled
Remote commanded test enabled
Test timeout off
DIAL LINE OPTIONS
Tone dial
Auto dial #1
Wait for dial tone
Wait delay 2 seconds
Pause delay 2 seconds
Call timeout 30 seconds
Answer on 1 ring
Autocallback disabled

DTE OPTIONS
Async data
PROTOCOL OPTIONS
DTE rate - 115200
LAPM protocol disabled *
8 bit, no parity
MNP protocol disabled *
AT command set enabled
Normal buffer mode
Ignores DTR *
Constant DTE speed
DSR forced high
DTE flow control disabled *
DCD normal
DCE flow control disabled *
CTS forced high
XON/XOFF pass through disabled DTE fallback disabled
Inactivity timer off
Options retained at disconnect
Break control 0 *
V.42 fast detect disabled *
SPEAKER OPTIONS
Volume low
On until carrier detect
*Indicates variation from factory option set #1

Modem 3600

E-33

Hardware Options

Factory Option Set # 7
(Synchronous 2-wire Leased Line Normal Originate)
(AT&F7)
MODEM OPTIONS
DCE rate - 33600
V.34 modulation *
V.34 rate threshold low *
V.34 asymmetric rate disabled *
Normal originate
Fast train disabled
Auto retrain enabled
SQ auto rate disabled
Transmit clock internal
Leased line, 2-wire *
Transmit level - 0 dBm *
Dial backup manual *
Lookback timer - 15 min *
Jack type RJ11
Line current disconnect long
Long space disconnect disabled *
V.22 guard tone disabled

TEST OPTIONS
Bilateral digital loop enabled
DTE local test disabled
DTE remote test disabled
Remote commanded test enabled
Test timeout off
DIAL LINE OPTIONS
Tone dial
Auto dial #1
Wait for dial tone
Wait delay 2 seconds
Pause delay 2 seconds
Call timeout 30 seconds
Answer on 1 ring
Autocallback disabled

DTE OPTIONS
Sync data *
PROTOCOL OPTIONS
AT command set disabled *
LAPM protocol disabled *
Ignores DTR *
MNP protocol disabled *
DSR normal *
Direct buffer mode *
DCD normal
DTE flow control disabled *
CTS follows RTS *
DCE flow control disabled *
RTS/CTS delay 0 ms *
XON/XOFF pass through disabled DTE fallback disabled
Inactivity timer off
Options retained at disconnect
Break control 0 *
V.42 fast detect disabled *
SPEAKER OPTIONS
Volume low
On until carrier detect

*Indicates variation from factory option set #1

E-34

Modem 3600

Hardware Options

Factory Option Set # 8
(Synchronous 2-wire Leased Line Forced Answer) (AT&F8)
MODEM OPTIONS
DCE rate - 33600
V.34 modulation *
V.34 rate threshold low *
V.34 asymmetric rate disabled *
Forced answer *
Fast train disabled
Auto retrain enabled
SQ auto rate disabled
Transmit clock internal
Leased line, 2-wire *
Transmit level - 0 dBm*
Dial backup manual *
Lookback timer - 15 min *
Jack type RJ11
Line current disconnect long
Long space disconnect enabled
V.22 guard tone disabled

TEST OPTIONS
Bilateral digital loop enabled *
DTE local test disabled
DTE remote test disabled
Remote commanded test enabled
Test timeout off
DIAL LINE OPTIONS
Tone dial
Auto dial #1
Wait for dial tone
Wait delay 2 seconds
Pause delay 2 seconds
Call timeout 30 seconds *
Answer on 1 ring
Autocallback disabled

DTE OPTIONS
Sync data *
PROTOCOL OPTIONS
AT command set disabled *
LAPM protocol disabled *
Ignores DTR *
MNP protocol disabled *
DSR normal *
Direct mode *
DCD normal
DTE flow control disabled *
CTS follows RTS *
DCE flow control disabled *
RTS/CST delay 0 ms *
XON/XOFF pass through disabled DTE fallback disabled
Inactivity timer off
Options retained at disconnect
Break control 0 *
V.42 fast detect disabled *
SPEAKER OPTIONS
Volume low
On until carrier detect

*Indicates variation from factory option set #1

Modem 3600

E-35

Hardware Options

Factory Option Set #9
(Synchronous V.25bis Dialer) (AT&F9)
MODEM OPTIONS
DCE rate - 33600
Modulation automode
V.34 rate threshold low *
V.34 asymmetric rate disabled *
Normal originate
Fast train disabled
Auto retrain enabled
SQ auto rate disabled
Transmit clock internal
Dial line
Jack type RJ11
Line current disconnect long
Long space disconnect disabled
V.22 guard tone disabled
PROTOCOL OPTIONS
LAPM protocol disabled *
MNP protocol disabled *
Direct mode *
DTE flow control disabled *
DCE flow control disabled *
XON/XOFF pass through disabled
Inactivity timer off
Break control 0 *
V.42 fast detect disabled *

SPEAKER OPTIONS
Volume low
On until carrier detect

TEST OPTIONS
Bilateral digital loop disabled
DTE local test disabled
DTE remote test disabled
Remote commanded test enabled
Test timeout off
DIAL LINE OPTIONS
Tone dial
Auto dial #1
Wait for dial tone
Wait delay 2 seconds
Pause delay 2 seconds
Call timeout 30 seconds
Answer on 1 ring
Autocallback disabled
DTE OPTIONS
Sync data *
V.25 SDLC dialer *
Character type ASCII
SDLC data format NRZ *
DTR disconnect *
DSR normal *
DCD normal *
CTS follows RTS *
RTS/CTS delay 0 ms *
DTE fallback disabled
Options retained at disconnect

*Indicates variation from factory option set #1

E-36

Modem 3600

Appendix F
ASCII and EBCDIC Characters

Hexadecimal equivalents of binary and decimal numbers are as follows.
Binary

Decimal

Hexadecimal

0000

0

0

0001

1

1

0010

2

2

0011

3

3

0100

4

4

0101

5

5

0110

6

6

0111

7

7

1000

8

8

1001

9

9

1010

10

A

1011

11

B

1100

12

C

1101

13

D

1110

14

E

1111

15

F

Hexadecimal Examples:
0101
1001
1110

1011 =5B hex
1101 =9D hex
0010 =E2 hex

Modem 3600

F-1

Hardware Options

The following table lists ASCII decimal, hexadecimal, and equivalent
character values, and EBCDIC characters. The table shows only
available keyboard symbols. Control keys are shown in the right column
of the first table.
ASCII
Symbol

Decimal

Hex

EBCDIC

Control
Key

(NUL)

0

00

NU (null)

@

(SOH)

1

01

SH (start of header)

A

(STX)

2

02

SX (start of text)

B

(ETX)

3

03

EX (end of text)

C

(EOT)

4

04

PF

D

(ENQ)

5

05

HT (horizontal tab)

E

(ACK)

6

06

LC (lower case)

F

(BEL)

7

07

delete

G

(BS)

8

08

--

H

(HT)

9

09

--

I

(LF)

10

0A

(SMM)

J

(VT)

11

0B

VT (vertical tab)

K

(FF)

12

0C

FF (form feed)

L

(CR)

13

0D

CR (carriage return)

M

(SO)

14

0E

SO (shift out)

N

(SI)

15

0F

SI (shift in)

O

(DLE)

16

10

DL (data link escape)

P

(DC1)

17

11

D1 (device control 1)

Q

(DC2)

18

12

D2 (device control 2)

R

(DC3)

19

13

D3 (device control 3)

S

(DC4)

20

14

RE (restore)

T

(NAK)

21

15

NL (new line)

U

(SYN)

22

16

BS (back space)

V

(ETB)

23

17

IL (light)

W

(CAN)

24

18

CN (cancel)

X

(EM)

25

29

EM (end of message)

Y

(SUB)

26

1A

CC

Z

F-2

Modem 3600

Hardware Options

ASCII
Symbol

Decimal

Hex

EBCDIC

Control
Key

(ESC)

27

1B

C1 (CU1)

[

(FS)

28

1C

FS (form separator)

\

(GS)

29

1D

GS (group separator)

]

(RS)

30

1E

RS (record separator)

^

(US)

31

1F

US (unit separator)

DEL

(SP)

32

20

DS

--

!

33

21

SS (SOS)

--

"

34

22

--

--

#

35

23

--

--

ASCII
Symbol

Decimal

Hex

EBCDIC

$

36

24

CP (bypass)

%

37

25

LF (line feed)

&

38

26

EB (end of block)

'

39

27

EC (escape)

(

40

28

--

)

41

29

--

*

42

2A

SM

+

43

2B

C2 (CU2)

,

44

2C

--

-

45

2D

EQ (enquiry)

.

46

2E

AK (acknowledgment)

/

47

2F

BL (bell)

0

48

30

--

1

49

31

--

2

50

32

SY (sync)

3

51

33

--

4

52

34

PN

5

53

35

--

6

54

36

UC (uppercase)

Modem 3600

F-3

Hardware Options

ASCII
Symbol

Decimal

Hex

EBCDIC

7

55

37

ET (end of transmission)

8

56

38

--

9

57

39

--

:

58

3A

--

;

59

3B

C3 (CU3)

<

60

3C

D4 (device control 4)

=

61

3D

NK (no acknowledgment)

>

62

3E

--

?

63

3F

SB (substitute)

@

64

40

space

A

65

41

--

B

66

42

--

C

67

43

--

D

68

44

--

E

69

45

--

F

70

46

--

G

71

47

--

H

72

48

--

I

73

49

¢ (cent)

J

74

4A

. (period)

K

75

4B

< (less than)

L

76

4C

( (open parenthesis)

M

77

4D

+ (plus)

N

78

4E

--

O

79

4F

& (ampersand)

P

80

50

--

Q

81

51

--

R

82

52

--

S

83

53

--

T

84

54

(leading pad)

U

85

55

--

F-4

Modem 3600

Hardware Options

ASCII
Symbol

Decimal

Hex

EBCDIC

V

86

56

--

W

87

57

--

X

88

58

--

Y

89

59

! (exclamation)

Z

90

5A

$ (dollar sign)

[

91

5B

* (asterisk)

\

92

5C

) (close parenthesis)

]

93

5D

; (semicolon)

^

94

5E

^ (caret or ¬)

_

95

5F

--

`

96

60

/ (ACK1)

a

97

61

--

b

98

62

--

c

99

63

--

d

100

64

--

e

101

65

--

f

102

66

--

g

103

67

--

h

104

68

--

i

105

69

--

j

106

6A

|

k

107

6B

,

l

108

6C

%

m

109

6D

_

n

110

6E

>

o

111

6F

?

p

112

70

ACK0

q

113

71

--

r

114

72

--

s

115

73

--

t

116

74

--

Modem 3600

F-5

Hardware Options

ASCII
Symbol

Decimal

Hex

EBCDIC

u

117

75

--

v

118

76

--

w

119

77

--

x

120

78

--

y

121

79

` (single quote)

z

122

7A

: (colon)

{

123

7B

# (pound)

|

124

7C

@ (at)

}

125

7D

' (apostrophe)

~

126

7E

= (equal)

DEL

127

7F

" (double quote)

--

128

80

--

--

129

81

a

--

130

82

b

--

131

83

c

--

132

84

d

--

133

85

e

--

134

86

f

--

135

87

g

--

136

88

h

--

137

89

i

--

138

8A

--

--

139

8B

--

--

140

8C

≤ (less than or equal)

--

141

8D

(

--

142

8E

+

--

143

8F

--

--

144

90

--

--

145

91

j

F-6

Modem 3600

Hardware Options

Decimal

Hex

EBCDIC

147

93

l

148

94

m

149

95

n

150

96

o

151

97

p

152

98

q

153

99

r

154

9A

--

155

9B

--

156

9C

x

157

9D

)

158

9E

±

159

9F

--

160

A0

--

161

A1

~

162

A2

s

163

A3

t

164

A4

u

165

A5

v

166

A6

w

167

A7

x

168

A8

y

169

A9

z

170

AA

--

171

AB

Î

172

AC

È

173

AD

[

174

AE

Š

175

AF

•

146

Modem 3600

F-7

Hardware Options

Decimal

Hex

EBCDIC

176

B0

S0 (SM0)

177

B1

S1 (SM1)

178

B2

S2 (SM2)

179

B3

S3 (SM3)

180

B4

S4 (SM4)

181

B5

S5 (SM5)

182

B6

S6 (SM6)

183

B7

S7 (SM7)

184

B8

185

B9

S9 (SM9)

186

BA

--

187

BB

°

188

BC

189

BD

] (close bracket)

190

BE

≠ (not equal)

191

BF

--

192

C0

{ (open brace)

193

C1

A

194

C2

B

195

C3

C

196

C4

D

197

C5

E

198

C6

F

199

C7

G

200

C8

H

201

C9

I

202

CA

--

203

CB

--

204

CC

(unprintable character)

205

CD

--

206

CE

(unprintable character)

F-8

Modem 3600

Hardware Options

Decimal

Hex

EBCDIC

207

CF

} (close bracket)

208

D0

J

209

D1

K

210

D2

L

211

D3

M

212

D4

N

213

D5

O

214

D6

P

215

D7

Q

216

D8

R

217

D9

--

218

DA

--

219

DB

--

220

DC

--

221

DD

--

222

DE

--

223

DF

--

224

E0

\ (back slash)

225

E1

--

226

E2

S

227

E3

T

228

E4

U

229

E5

V

230

E6

W

231

E7

X

232

E8

Y

233

E9

Z

234

EA

--

235

EB

--

236

EC

(unprintable character)

237

ED

--

Modem 3600

F-9

Hardware Options

Decimal

Hex

EBCDIC

238

EE

--

239

EF

--

240

F0

0

241

F1

1

242

F2

2

243

F3

3

244

F4

4

245

F5

5

246

F6

6

247

F7

7

248

F8

8

249

F9

9

250

FA

|

251

FB

--

252

FC

--

253

FD

--

254

FE

--

255

FF

(trailing pad)

F-10

Modem 3600

Appendix G
Abbreviations and Acronyms
A
ABT
ac
ACK
ACR
ACU
ADD
ADDR
ASCII
AT&T

Abort Timer OR Answer
Back Tone
Alternating Current
Acknowledgment, positive
Abort Call, Retry
Automatic Call Unit
Address Field
Address
American Standard Code
for Information
Interchange (7 level)
American Telephone and
Telegraph

B
BER
BERT
BIL LB
Bit
bps
BSC

Bit Error Rate
Bit-Error-Rate-Test (set)
Bilateral Loopback
Binary Digit
Bits Per Second
Binary Synchronous
Communications

C
C
CA
CC
CCITT

Celsius
Circuit Assurance
Carrier Control
International Consultative
Committee for Telegraph
and Telephone
CD
Carrier Detect
CFICB Call Failure Indication Local DCE Busy
CFIDT Call Failure Indication No Dial Tone
CFINT Call Failure Indication No Answer Back Tone
CFIRT Call Failure Indication Ringback Detected
Ch Gnd Chassis Ground
CIC
Connect Incoming Call
CO
Central Office

COS
CR
CRC
CRQ
CTRL
CTS, CS

Call Originate Status
Carriage Return
Cyclic Redundancy Check
Call Request
Control Field
Clear to Send

D
DAA

Data Access Arrangement
(AT&T)
dB, db
Decibel
dc
Direct Current
DCE
Data Communications
Equipment (modem)
DCD
Data Carrier Detect
DCPSK Differentially Coherent
Phase-Shift Keying
DIC
Disregard Incoming Call
DIS, DS Disable
DLE
Data Link Escape
DLO
Data Line Occupied
DMS
Digital Multiplexer System
DOS
Disk Operating System
DPR
Digit Present
DSR
Data Set Ready
DTE
Data Terminal Equipment
DTMF Dual Tone Multi
Frequency
DTR
Data Terminal Ready

E
EBCDIC Extended Binary Coded
Decimal Interchange Code
(8 level)
EIA
Electronic Industries
Association
EIA-232C,Interface between DTE
EIA-232Dand Data Interchange
Communication
Equipment employing
serial binary data
EN
Enabled
ENQ
Enquiry
EOA
End of Address
Modem 3600

G-1

Abbreviations and Acronyms

EOM
EON
EOT

End of Message
End of Number
End of Text OR
End of Transmission
EPROM Erasable Programmable
Read Only Memory
ER
Error
ESC
Escape Key
ETB
End of Block
ETC
External Transmit Clock
ETX
End of Text
EXT
External
F
FB
FCC

Fallback
Federal Communications
Commission
FF
Form Feed
FGND Frame Ground
FL
Flag
FLL
Fixed loss loop
FM
Frequency Modulation
Fox
Test message (The quick
message brown fox jumps over the
lazy dog) 0123456789
FSK
Frequency-Shift Keying
H
HDLC
Hz
I
INC
IC
INV
INVCU

High Level Data Link
Control
Hertz (cycles per second)

Incoming Call
Industry Canada
Invalid
Invalid Command Command Unknown
INVMS Invalid Command Message Syntax Error
INVPS Invalid Command Parameter Syntax Error
INVPV Invalid Command Parameter Value Error
I/O
Input / Output
IS
International Standard

G-2

K
KBD
kbps

Keyboard
Kilobits Per Second

L
LAL
LAPD

Local Analog Loopback
Link Access Protocol D Channel
LAPM Link Access Protocol for
Modems
LB OPTS Loopback Options
LCD
Liquid Crystal Display OR
Line Current Disconnect
LDL
Local Digital Loopback
LED
Light Emitting Diode
LF
Line Feed
LL
Local Loopback
LO
Line Occupancy
LRC
Longitudinal Redundancy
Check
LSD
Long Space Disconnect
LSO
List of Stored Options
LSV
List Version
M
mA
MHz
Modem
MR
ms

Milliamps
MegaHertz
Modulator / Demodulator
Modem Ready
Millisecond

N
NAK
Negative
Acknowledgment
NET STAT Network Status
NRZ
Non Return to Zero
NRZI
Non Return to Zero
Inverted
NS
No Signal
NT
Network Termination
O
OH
OS

Modem 3600

Off Hook
Out-of-Service

Abbreviations and Acronyms

P
PBX
PC
pc
PIW
PN
PND
POTS
PRI
PRO
PROG,
PR
PROM
PSK
PSTN
PWI
Q
QAM

R
RAD
RAL
RAM
RC
RCD
RCV,
RCVR
RD
RDL
RI
RL
RLO

Private Branch Exchange
Personal Computer
Printed circuit (board)
Power Indication
Pseudo random
Present Next Digit
Plain Old Telephone
Service
Primary
Program Option
Programmable
Programmable Read Only Memory
Phase Shift Keying
Public Service Telephone
Network
Power Indication

Quadrature Amplitude
Modulation

Random Access Method
Remote Analog Loopback
Random Access Memory
Receive Clock
Receiver-Carrier Detector
Receiver

Receive Data
Remote Digital Loopback
Ring Indication
Remote Loopback
Request List of Stored
Options
RLSD
Received Line Signal
Detector
RLV
Request List of Version
rms
Root-Mean-Square
RMT LB Remote Loopback
RNG
Ringback Detection
RO
Receive Only
ROM
Read Only Memory
RT
Remote Terminal
RTS, RS Request to Send
RX
Receive

S
SD
SDLC
SGND,
SG
SH
SNR
SPID
SQ
SQM
SS
STX
SYN

Send Data
Synchronous Data Link
Control (IBM)
Signal Ground
Switch Hook
Signal / Noise Ratio
Service Profile Identifier
Signal Quality
Signal Quality Monitor
Systems Status
Start of Text
Synchronization Character

T
TC
TD
TE
TEI

Transmit Clock
Transmit Data
Terminal Equipment
Terminal Endpoint
Identifier
TELCO Telephone Company
TELSET Telephone Set
TM
Test Mode
TP
Test Pattern
TR
Terminal Ready
TST
Test
TX
Transmit
U
UART
USOC

V
V.
V.24

Vac
VAL
Vdc

Modem 3600

Universal Asynchronous
Receiver / Transmitter
Universal Service
Ordering Code

CCITT Code Designation
List of definitions for
interchange circuits
between data terminal
equipment and data
circuit-terminating
equipment (and
provisional
amendments, May 1977)
Volts Alternating Current
Valid
Volts Direct Current

G-3

Abbreviations and Acronyms

X
X.
XMIT
XOFF
XON

G-4

CCITT Recommendation
Designation
Transmit
Transmitter Off
Transmitter On

Modem 3600

Appendix H
Flash Upgrade
Upgrade your modem easily using this flash update procedure.

What You Need
• A data communications software package that supports a 57.6 kbps
DTE rate and “X modem CRC” protocol
• Flash upgrade file
Look for modem software upgrades on the Web at this address:
http://www.mot.com/MIMS/ISG/Service_Support/software.html

Steps For Downloading
IMPORTANT: Do not abort this process, once started!
1) Activate your data communications software package, and set up
your DTE for 57.6 kbps.
2) Enter AT.
You should receive an OK response message.
3) Enter AT%P1=password (8 digits)
For example: AT%P1=12345678
This entry sets a soft download password. (See theAT command
set for further information on the %P commands if needed.)
You should receive an OK response message.
4) Enter
AT$Y=password (8 digits)
For example:
AT$Y=123456768
You should receive this response message:
SOFTLOAD XM86-1
READY
This means that your modem is ready to be upgraded.
Modem 3600

H-1

Flash Upgrade

5) From your terminal software package, send the “flash upgrade
file” to the modem. You know the download is working because
the LCD displays:
FLASH UPGRADE
IN PROGRESS
Note
Be sure you use the “X modem CRC” protocol.
The modem automatically resets after the upgrade is complete. The
process can take several minutes.
One of two messages returns.
DOWNLOAD OK
indicates a successful upgrade.
DOWNLOAD ERROR
indicates a problem with the download.
Enter ATI3 if you want to verify the latest software update.

Troubleshooting
1) You did not choose the correct download protocol.
Response: Repeat the process.
2) The upgrade flash file is corrupted.
Response: Get a clean file and redo the steps.
3) If all else fails:
Response: See the “Calling Technical Support” section on
page 12-2

H-2

Modem 3600

Service and Support
Introduction
U.S.A. customers who have questions about products or services should refer to
the following sections. Non-U.S.A. customers should contact their local
distributor.

Questions About Product Shipment or Technical Assistance
Please call Black Box at 724-746-5500.

To Access the Black Box Internet Web Pages
Additional company and product information can be found on our Internet Web
site: http://www.blackbox.com/

Sales-Related Issues
Call Black Box at 724-746-5500.

Questions About Billing
Call Black Box at 724-746-5500.

Modem 3600

Service - 1

Index
A

$S=x 8-4
$S? 8-10
$V 5-32
$W 8-9
$W? 8-9
%A 10-20
%An 6-6
%B 5-28, 10-22
%C 6-12, 10-17
%D 6-4, 10-20
%E 5-30, 10-19
%L 5-29, 10-27
%P 5-42
%R 5-30, 10-15
%T 5-43
%V 5-31
&D 5-20, 10-9
&F 5-39
&G 5-25, 10-10
&L 5-36, 10-11, 10-13
&M 5-25, 10-11, 10-12
&P 5-26, 10-10
&R 5-21, 10-9, 10-24
&S 5-20, 10-9
&T 5-43, 10-10
&V 5-40
&W 5-38
&X 5-27, 10-11
&Y 5-38
&Z 5-40
*CNx,n 5-40
*DA 5-32
*DB 5-36, 10-13
*DG 10-13
*FB 5-22, 10-12
*FT 5-32, 10-12
*IC 5-32
*LA 10-13
*LC 5-32, 10-13
*MM 5-27

Analog loopback 10-8
Answer / originate 10-7
Answer mode
switching to after dialing 5-15
Answering a call 3-3
ASCII
character table F-1
Async DTR dialer
DTR async dialer 10-11
Async/sync mode
s-register settings 10-11
AT command
answer 5-17
AT command set
disable 5-33
S-register enable/disabling 10-12
AT command statement 5-3
AT commands
$$ 8-11
$C=x, - 8-4
$C=x, y 8-4
$Cn=m 8-8
$D 8-7
$D=x 8-4
$D? 8-4
$DR 8-4
$E=x 8-4
$E? 8-4, 8-10
$EH=pw 8-7
$F=pw$pw 8-10
$IBn 8-11
$In 8-11
$Ln=m 8-8
$M 8-9
$n=pw 8-11
$Pn=pw$pw 8-8
$Rn 8-10
$S=pw 8-11

V.3600

Index-1

Index

*ND 5-40
*NT 5-33, 10-12
*OR 5-36, 10-7
*RC 5-8, 10-17
*RD 10-13
*RO 5-41, 10-12
*RR 5-31
*TDn 5-33
*TLn 5-36, 10-14, 10-15
+++ 5-22
+FCLASS 9-4
` 10-16
A 5-17, 6-11, 10-20
A/ 5-4
AT 5-3
B 6-11, 10-25
C 6-11, 10-19
categories 5-1
D 5-13
E 5-22, 10-7
F 5-23
G 6-8, 10-16
H 5-23, 10-7
I 5-24
J 6-5, 10-24
K 10-18
Kn 6-9
L 5-24, 10-10
M 5-24, 6-5, 10-10, 10-23
N 6-6, 10-23
O 5-25, 10-19
P 10-7
Q 5-6, 6-7, 10-7
R 5-21, 10-19
response commands 5-5
T 6-10, 10-7, 10-17
V 5-6, 10-7, 10-19
W 5-6
X 6-8, 10-10, 10-16
Y 5-25, 10-9
Z 5-39
Attention code (AT) 5-3
Auto reliable data buffer
s-register settings 10-19

Index-2

Auto retrain
s-register settings 10-19
Autobaud 5-3
Autocallback
s-register settings 10-24
Autodial backup number to dial
DTR number to dial 10-13
Autodialing from front panel 3-2
Auto-reliable fallback character 6-6
Auto-reliable mode 6-2

B
BER
s-register settings 10-15
Binary File Transfer (BFT) standard
9-10
Block size
maximum reliable 6-11
s-register settings controlling size
10-20
Break control 6-9
Buffer
disconnect delay 6-4
set auto-reliable 6-11

C
Call termination conditions 3-4
Caller ID 5-17
Carrier detect level A-3
CCITT 9-1, 9-3
Clock
external transmit frequency A-2
internal transmit frequency A-2
s-register settings 10-11
synchronous transmit source of
5-27
Command Index and Defaults E-1
Compression
s-register settings 10-17
Configuration
remote 5-41
resetting stored 5-39

V.3600

Index

Configuration profile 5-40
Connect messages
s-register settings 10-10
Constant speed interface 6-2
Cover
removal of C-1
CTS
s-register settings 10-9
CTS control
Clear to send (CTS) 10-9
CTS flow control
s-register settings 10-16
CTS follows DCD option
s-register settings 10-24
CTS/RTS flow control 10-16

D
Data compression 6-2
V.42 bis 6-12
Data link flow control 6-8
Data rates A-2
DCD
s-register settings 10-9
DCD control
Data carrier detect (DCD) control
10-9
DCE speed
s-register settings 10-21
Dial
pulse ratio 5-26
Dial backup
s-register settings 10-13
Dial modifiers
"!" 5-15
P 5-14
R 5-15
Sn 5-16
Dial, tone/pulse
s-register settings 10-7
Dialing 3-2
Digital interface
specifications A-1
Digital loopback 10-8

Direct mode 6-3, 6-10
Disconnect
buffer delay 6-4
fast 5-23
long space 5-25
Distinctive ring 5-18
DSR
s-register settings 10-9
DSR control
Data set ready (DSR) control 10-9
DTE
connection of 2-2
serial port adjust 6-5
DTE fallback
S-register enable/disable 10-12
DTE flow control
s-register settings 10-16
DTE/DCE constant speed
s-register settings 10-24
DTR
s-register settings 10-9
DTR control
Data terminal ready (DTR) control
10-9
DTR dialer
s-register settings 10-11
DTR in autoanswer 5-17

E
Echo 10-7
local character 5-22
online character 5-23
EIA-578 9-1, 9-3
Environmental conditions A-1
Error control 6-1
Escape sequence
Changing from data mode to
command mode 5-22

F
Factory option set
loading 5-39

V.3600

Index-3

Index

Factory option sets
set #1 E-28
Fallback character 6-6
Fault isolation procedure D-1
Fax commands
class1 quick reference E-15
D 11-5, 11-6, 11-7, 11-10, 11-12
quick reference E-15, E-19
fax initialization command string 9-2
Fax mode
features of 1-3
Fax Modulation 9-7
Fax modulation rates A-2
Fax operation 11-5, 11-6, 11-7,
11-10, 11-12
Fax rates A-2
fax transmit/receive modes 9-7
Features 1-2
Flow control 6-3
data link 6-8
s-register settings 10-16
Flow control, serial port 6-7
4-wire operation 5-33
Full duplex 5-34
Fuse 12-1

J
Jack
DIAL pin functions B-1
TELSET/LEASED LINE pin
functions B-1

L

G

LAPM 6-1
LCD menu 4-2
Leased line
s-register settings 10-13
Leased lines 2-8
Line current disconnect
s-register settings 10-13
Line equalization A-3
Line type
s-register settings 10-11
Link layer protocols A-3
Local analog loopback, DTE
commanded
s-register settings 10-13
Local character echo
s-register settings 10-7
Logon
Security 8-11
Long space disconnect 10-9
s-register settings 10-9

Ground C-4
Guard tones
s-register settings 10-10

M

H
HDLC data framing 9-3

I
IC requirements vi
Inactivity timer 6-10
Installation 2-1
Internet web pages 1

Index-4

Make/break ratio
s-register settings 10-10
MNP 6-1, 10-23
MNP compression
s-register settings 10-19
MNP or normal mode 6-9
MODEM AND TELEPHONE LINE
CHECK D-2
Modem Options command 11-10
Modulation rates A-2

V.3600

Index

N
Normal mode 6-2, 6-10

O
Off hook
command description 5-23
Offline command mode 5-2
Online command mode 5-2
Operating mode selection 6-6
Operating mode status
s-registers settings 10-23
Operation with security
local 8-3
Remote 8-2
Option Sets E-28
Options
retaining/restoring 5-41
Options retained / restored 10-12

P
Parity
s-register settings 10-19
Password 8-3, 8-6
change 8-4
default 8-7
delete 8-4
set 8-4, 8-8
Pause 5-14, 10-5, 10-6
Phone Jack Descriptions B-1
Phone jack pin descriptions B-1
Power
AC connection 2-2
DC connection 2-2
modem requirements A-1
Power-up procedure 3-1
PRK 11-12
PRO 11-10
Profile
active 5-37
factory 5-37
stored 5-37

Profile
fax operation 9-3
Protocol
compatible with 1-2
Protocol commands 6-3
Protocol response messages
s-register settings 10-19
PSTN
connection 2-7

R
Rate renegotiation 5-31
Reliable mode 6-1
Remote configuration
security 5-42
Remote digital loop request
s-register settings 10-10
Remote digital loopback 10-8
Remote digital loopback, DTE
commanded
s-register settings 10-13
Request List of Stored Options 11-13
Response messages 5-6, 10-7, 10-10
Restore Factory Settings 11-12
Returning the modem 12-2
Revision Level 5-31
RI LED -- ring indicator
s-register settings 10-19
Ring indicator
command description 5-21
RTS/CTS delay A-3

S
Save Current Settings 11-12
Security 8-1
disabling/enabling 8-4
display extended feature status 8-9
display status 8-10
display user status 8-10
enable/disable high 8-7
extended features 8-9
factory reset 8-10

V.3600

Index-5

Index

S25 10-11
S26 10-11
S27 10-11
S28 10-11
S29 10-12
S3 10-5
S30 10-12
S32 10-13
S34 10-13
S35 10-13
S4 10-5
S44 10-14
S45 10-14
S49 10-14
S5 10-5
S50 10-14
S52 10-14, 10-15
S53 10-15
S54 10-16
S56 10-17
S57 10-17
S58 10-17
S59 10-18
S6 10-5
S60 10-19
S61 10-19
S62 10-20
S63 10-20
S64 10-20
S67 10-21
S69 10-22
S7 10-5
S70 10-23
S71 10-23
S72 10-24
S73 10-24
S74 10-24
S75 10-24
S76 10-25
S77 10-25
S78 10-25
S79 10-25
S8 10-6
S80 10-26

levels 8-5
passwords 8-6
remote code 5-42
remote logon procedure 8-11
removing a user 8-10
set levels 8-8
setting passwords 8-8
superuser status 8-11
verify user 8-11
Serial Number 5-32
Serial port
DTE adjust 6-5
Serial Port flow control 6-7
Signal options
displaying received 5-40
Size A-1
Speaker
s-register settings 10-10
Specifications A-1
S-register
autoanswer 10-4
hexadecimal/decimal values 10-2
S-register commands
Sn.#=v 10-4
Sn=^v 10-3
Sn=v 10-3
Sn? 10-3
Sn?^ 10-3
S-registers
changing values 10-3
individual bit command 10-4
quick reference E-21
reading 10-3
S0 10-4
S1 10-4
S10 10-6
S11 10-6
S12 10-6
S16 10-8
S18 10-8
S2 10-5
S21 10-9
S22 10-10
S23 10-10

Index-6

V.3600

Index

S81 10-27
S88 10-28
S9 10-6
S91 10-29
Straps
ground option C-4
Superuser
See Security 8-11
Sync clock selection 10-11

T
Table 5-1 5-9
Technical support 12-2
Teephone line
specifications A-1
Telco connection A-3
Telephone
line connection 2-6
Telephone Interface D-1
Telephone number
storing 5-40
Temperature A-1
Test, system 10-8
Testing A-3
Tests 7-1
Timer
inactivity 6-10
Transmit break/set break length 6-11
Transmit level
dial line 5-33
leased line 5-36
Transmit output level A-2
2-wire operation 5-34

11-14
V.25 bis autodialer commands
quick reference E-26
V.25 NRZ/NRZI
s-register settings 10-12
V.25 protocol selection
s-register settings 10-12
V.25 VAL
s-register settings 10-12
V.32 fast train 5-32
s-register enable/disable 10-12
V.42 optional detect phase 6-5
V.42 bis 6-1
Version level 5-24

W
Web pages 1
Word length --7/8 bit
s-register settings 10-19

X
XON/XOFF 6-7, 6-8, 9-4
XON/XOFF characters
s-register settings 10-16
XON-XOFF characters from DTE
s-register settings 10-14

V
V.25 ASCII / EBCDIC
s-register settings 10-12
V.25 bis
response messages E-26
V.25 bis auto dialer commands
quick reference E-24
V.25 bis Autodialer 11-7, 11-8, 11-9,

V.3600

Index-7

Index

Index-8

V.3600
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Creation Date                   : 2001:06:19 14:18:57Z
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Author                          : mfishel
Mod Date                        : 2002:10:09 16:25:50-06:00
Metadata Date                   : 2002:10:09 16:25:50-06:00
Creator                         : mfishel
Title                           : V3600-bk.fm
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