ETEK TECHNOLOGY TD5612DCII MODEM User Manual TD 56000III EN

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7''&,,Modem User's Manual
CONTENTS
Chapter 1 INTRODUCTION
1. 1 Introduction
1. 2 Modem Features
Chapter 2 UNPACKING AND INSTALLATION
2.1 Unpacking the Modem
2.2 Modem Installation
2.3 The LED Indicators on the Front Panel
2.4 The Rear Panel and the Connectors
2.5 The Serial Port and the RS-232 Cable
2.6 Hardware Connection
2.7 Test the Power connection
2.8 Test the Telephone Line Connection
2.9 Data Communications Software Packages
2. 10 Fax communications Software Packages
2. 11 Error-Correction and Data compression
2. 12 Installation of Modem Driver in WindowsXP
Chapter 3 The Modem AT commands
3.1 Prefix, Repeat and Escape Commands
3.2 Dial Commands and Dial Modifiers
3.3 Operation Commands
3.4 Error Control/Data Compression Commands
15
3.5 S-Register Summary
23
3.6 Result Codes
25
Chapter 4
27
4.1 AT Command Set Problems
27
4.2 Command Echo Problems
28
4.3 Auto-Answer Problems
28
4.4 Dialing Problems
29
4.5 Data Transfer Problems
29
4.6 Connection Problems
30
TD-5612DCII Modem User's Manual
TD-5612DCII Modem User's Manual
ETEK TECHNOLOGY (SHENZHEN) Co., Ltd. does not assume any liability arising
out of the application or use any products, circuit, or software described herein,
neither does it convey any license under its patent rights nor the patent rights of others.
ETEK TECHNOLOGY (SHENZHEN) Co., Ltd. Further reserves the right to make
improvements to the product described in this manual at any time and without
notice.
About Your Modem
Congratulations on the purchase of your TD-5612DCII modem one of
premier high-performance products. The TD-5612DCII modem is world renown for
its ability to maintain ultra high speeds and clear, quality connections while
communicating around the globe.
About This Manual
This manual describes the use of your TD-5612DCII data/fax modem and gives
instruction for its installation and operation.
Trademarks:
Hayes is a trademark of Hayes Microcomputer Products. Inc
Crosstalk is a trademark of Mircostuf Inc.
Microphone li is a trademake of Software Ventures
Procomm is a trademark of datastorm Technologies, Inc.
Micro Networking Protocol, MNP are trademarks of Microcom Inc
BTLZ is a trademark of British Telecommunications
Homefax2 is a trademark of Hong Kong Telecom.
V.FC and V. Fast Class are trademarks of Rockwell Int'l Corp.
Other names are trademarks of their respective holders.
Modem User's Manual
2005 ETEK TECHNOLOGY (SHENZHEN) CO., LTD.
TD-5612DCII Modem User's Manual
Chapter 1 INTRODUCTION
Chapter 1 INTRODUCTION
This chapter describes modem introduction and Features.
1. 1 Introduction
modem is a powerful tool which uses a telephone line to link your
computer with other computers. Once linked, you can exchange information with
databases, bulletin boards, and other computer users.
is proud to be part of your journey through today's global
communications network.
1. 2 Modem Features
Compatible with BELL 103, 212A standards and ITU V.92、 V.90、 V.34、
V.32BIS、V.32 、 V.22BIS、 V.22 、V.21 、Bell 212，103 recommendations.
The
TD-5612DCII modem is a high performance universal modem
capable of transmission speed up to 56Kbps full-duplex on a 2-wire dial-up
line. Universal compatibility covers a broad range of ITU-T and BELL
standards.
Various operation modes that can be achieved are as follows:
Table 1-1
TD-5612DCII Data Operation Modes
Standard
Bit Rate [bps]
Bell 103
Bell 212
V.21
V.22
V.22 bis
V.23
V.32
V.32bis
V.34
300
1200 Rx/75 Tx or 75 Rx/1200 Tx
300
1200
2400 or 1200
1200
9600 or 4800
14400,12000,9600,7200,or 4800
33600,32100,28800,26400,24000,21600,19200,16800,14400,12000,9600,
7200,4800, or 2400
56000,54667,53333,52000,50667,49333,48000,46667,45333,44000,42667,
V.90
41333,40000,38667,37333,36000,34667,33333,32000,30667,29333,28000
48000,46667,45333,44000,42667,41333,40000,38667,37333,36000,34667,
V.92 upstream
33333,32000,30667,29333,28000,26667,25333,24000
V.92 downstream 56000,54667,53333,52000,50667,49333,48000,46667,45333,44000,42667,
41333,40000,38667,37333,36000,34667,33333,32000,30667,29333,28000
TD-5612DCII Modem User's Manual
Chapter 1 INTRODUCTION
1、 Data Format：Asynchronous
2、DTE Data Rate
Async：115200/57600/38400/19200/9600/4800/2400/1200/600/300bps
Data Bits：8 、9、10、 11 bits
Parity：Odd 、Even、None
Stop Bits：1 、2 bit
3、Error Correction：V.42 LAPM and MNP 2 - 4
Data Compression：V.44、 V.42bis and MNP 5
4、Flow Control：
Hardware flow control
Software flow control
5、Command Set
DATA：Hayes AT &
Specific AT Compatible
FAX：CLASS 1 & CLASS 1.0
6 Telephone Line connection
、
：2-wire dial-up, 2-wire leased line
7、Output resistance : average 600Ω± 10%
8、Power Supply：Input 110~240V AC, 50/60Hz
Output 12V 1000mA
Power consumption：< 10 W
9、PC Serial Port Pinouts:
Signal
Pin
15
17
18
20
21
22
24
25
ITU-TSS
Signal Name
Pin/Signal
Description
Direction
DTE-DCE
101
103
104
105
106
107
102
109
114
115
141
108
140
125
113
142
（GND）Protective Ground
（TXD）Transmitted Data
（RXD）Received Data
（RTS）Request To Send
（CTS）Clear To Send
（DSR）Data Set Ready
（GND）Signal Ground
（DCD）Data Carrier Detect
（DCE）Transmitter Clock
（RXC）Synchronous Receive Clock.
（AL）Local Analog Loop Back Test.
（DTR）Data Terminal Ready. Connect DCE to Line
（RDL）Remote Digital Loop Test.
（RING）Ring Indicator
（XTC） Transmit Clock Signal (Source: DTE).
（TST）Test Indicator
—
DTE
DCE
DTE
DCE
DCE
—
DCE
DCE
DCE
DTE
DTE
DTE
DCE
DTE
DCE
TD-5612DCII Modem User's Manual
Chapter 2 UNPACKING AND INSTALLATION
Chapter 2 UNPACKING AND INSTALLATION
This chapter describes the procedures for unpacking and Installing
Modem, Chapter 2 is designed to have normal PC users on-line quickly.
2 . 1 Unpacking the Modem
The complete
Modem package includes：
TD-5612DCIIModem
RJ-11 to RJ-11 Cable
RS-232 Cable
DC 12V Adapter
User's Manual
Software
1 PCS
1 PCS
1 PCS
1 PCS
1 PCS
1 PCS
2 . 2 Modem Installation
This chapter describes the panel function and installation procedure for the
TD-5612DCII.
A shielded RS-232 cable is required to ensure compliance with FCC Part 15, and
it is your responsibility to use a shielded RS-232 cable. Make sure your
installation site is clean and well ventilated. The ventilation slot of your
modem located on the sides and bottom should not be covered to allow for free
movement of air.
TD-5612DCII Modem User's Manual
Chapter 2 UNPACKING AND INSTALLATION
2 . 3 The LED Indicators on the Front Panel
The indicators on the modem's front panel denote the current modem operation
characteristics and status. They are:
LED
MR(Modem Ready)
TR(Terminal Ready)
SD(Send Data)
RD(Receive Data)
OH(Off-Hook)
CD(Carrier Detected)
AA(Auto-Answer)
HS(High Speed)
Function
Lights up when the modem is turned on.
Flashes when DTR signal is detected.
Flashes when the modem is sending data to the remote modem or
when receiving data from the local computer.
Lights up when a carrier from the remote modem is detected.
Lights up when the modem is using the telephone line. Off when
the modem hangs-up(on-hook).
Lights up when a carrier from the remote modem is detected.
Lights up when the modem is set for auto-answer. Flashes when an
incoming ring is detected.
Lights up when modem speed exceeds 4800bps.
When you turn on your modem, at least the MR indicator shall light up. There
may be some other indictors lights depended on the settlement of the modem.
Otherwise, you should check the power connected to your modem.
2.4 The Rear Panel and the Connectors
PHONE: Accepts a telephone set connected parallel to your modem or to a
2-wire leased line.
LINE: Accepts the RJ-11 cable that links your modem to a telephone line.
RS-232 : Accepts the serial cable that is connected between your modem and your
computer.
Power: Accepts the power adapter that comes with your modem.
TD-5612DCII Modem User's Manual
Chapter 2 UNPACKING AND INSTALLATION
2.5 The Serial Port and the RS-232 Cable
To use this modem, it will require an RS-232 serial port on your computer. If your
do not have it, you need to have one.
It is better to select a serial port card that uses a high-speed 16550 UART chip. A
card with an ordinary UART chip handles transmissions at a maximum speed
around 38,400bps. In case the data compression of your modem is active, it may
perform at an exceeding speed and an ordinary serial port card may sometimes
cause data loss.
You will also require an RS-232 cable to connect your modem with computer. You
will be Asked to buy a modem cable if you are a PC user. The modem cable shall,
at one end, have a DB25M (male) connector that fits the female connector on the
modem, and at the other end a serial port connector that matches your computer.
2.6 Hardware Connection
1)
2)
3)
4)
5)
Make sure that both the modem and computer are turned off.
Use an RS-232 cable to connect the modem to a serial port on your computer.
Secure the connector screw on it.
Verify the serial port number in which your modem is connected. You must
Write down the port number as you will need to specify this number during
software installation. As a general rule on PC applications, the port COM1 is
connected to a mouse, while COM2 is for a modem.
Use an RJ-11 cable to connect the LINE jack to the wall outlet of the
telephone line.
Connect a telephone set to the PHONE jack. You may leave this jack
disconnected if desired.
Make sure that the power adapter that comes with your modem is of a correct
voltage that complies with your power source. Use the adapter to connect the
power source to the POWER jack one the modem.
2.7 Test the Power connection
You can turn on your modem by pushing the power switch button and watch the
front panel indicators. Depending on the setting of your modem, the MR and other
indicators should light up. If none is lit, check the power connection for the
modem.
TD-5612DCII Modem User's Manual
Chapter 2 UNPACKING AND INSTALLATION
2.8 Test the Telephone Line Connection
Once a telephone set is connected, you may test the line quality and connections
by lifting the telephone handset, listening for a clear dial tone, and making several
telephone calls. The calls should go through well and the sound loud and clear.
Otherwise, the line may be poor or have a faulty connection.
2.9 Data Communications Software Packages
Your modem follows the industrial standard in the modem command set. As a
result, most of the popular communications software packages off-the-shelf will
work with it. You should select a software package according to your application
requirement.
Most popular communications software are provided with the configuration
named Initial-String or Dialing-Prefix. It is wise to check, one by one, the
commands in this string as they will be sent to determine the modem
characteristics each time prior to dialing.
2.10 Fax communications Software Packages
Similar to data communication applications, you interact with the modem through
the fax communications software.
Your modem supports Class 1& Class 1.0 command set.
2.11 Error-Correction and Data compression
Your modem supports the industrial standards of V.42 LAPM、 MNP 2-4 and
V.44、 V.42bis、 MNP 5 for error-correction and data compression (ECDC).
Both standards are capable of error-correction as well. The modem will retransmit a faulty data block when an error is detected while receiving.
2.12 Installation of Modem Driver in WindowsXP
1. Windows XP "Found New Hardware Wizard". Please tick "Install from a list or
specific location", and then go to next step.
TD-5612DCII Modem User's Manual
Chapter 2 UNPACKING AND INSTALLATION
2. In Install New Modem, please tick "Don't search, I will choose the driver to
install", and then go to next step.
3. Because the modem is not listed, you click "Have Disk" for other modem
models.
TD-5612DCII Modem User's Manual
Chapter 2 UNPACKING AND INSTALLATION
4. Insert the installation disk into the driver selected, click "Browse", select one
of the in files, and then click "OK".
5. Click the manufacturer and model of your modem, Please select it and then go
to next step.
6. Your modem has been set up successfully. Click "Finish".
TD-5612DCII Modem User's Manual
Chapter 3 The Modem AT commands
Chapter 3 The Modem AT commands
This chapter describes AT command sets in alphabetical order. The default setting,
if applicable, is indicated by bold characters. Note that in order to meet local
telephone company regulations. Some modem commands might have been
removed or set to different default.
3.1 Prefix, Repeat and Escape Commands
AT Attention. Precede all command lines except A/ and +++
A/
Re-execute the last command in command buffer
+++ Escape characters, requires guard time before and after
3.2 Dial Commands and Dial Modifiers
S=n
Originate a call
Dial the number stored in the directory (n=0 to 3).
Touch tone dialing
Pulse dialing
Dial in answer mode
Wait for second dial tone
Re-Dial the last valid telephone number
Pause
Flash
Return to command state
3.3 Operation Commands
Bn
En
Hn
Answer incoming call
n=0 Selects CCITT operation at 300 or 1200 bps during Call
Establishment and a subsequent connection.
n=1 Selects BELL operation at 300 or 1200 bps during Call
Establishment and a subsequent connection.
n=0 Disable command echo
n=1 Enable echo command characters
n=0 Hang up the connection (on-hook)
n=1 Go off-hook to make a call
TD-5612DCII Modem User's Manual
Chapter 3 The Modem AT commands
In
Ln
Mn
Nn
On
Qn
Sr?
Sr=n
Vn
Wn
Xn
Yn
Zn
&Cn
10
n=0 Reports product code
n=1 Calculates the ROM checksum
n=2 Reports firmware version
n=0 Low volume
n=1 Low volume
n=2 Medium volume
n=3 High volume
n=0 Speaker off at all times
n=1 Speaker on until CD detected
n=2 Speaker always on
n=0 Fixed data rate follow *N command
n=1 Enable adaptive data rate
n=0 Return to data-link without retrain
n=1 Return to data-link with retrain
n=0 Modem sends response codes
n=1 Do not send response codes
Display the value in register r
Set register r to a value n
n=0 Display response codes in digit form
n=1 Display response codes in words
n=0 Upon connection, the modem reports only theDTE speed
n=1 Upon connection, the modem reports the modulation, line speed,
the error correction protocol, and the DTE speed, respectively.
Subsequent responses are disabled.
n=2 Upon connection, the modem reports the DCE speed
n=0 Enable basic response codes 0-4
n=1 Do not detect dial tone and busy signal
n=2 Include dial tone detection response
n=3 Include busy detection response
n=4 Enable all response codes
n=0 Do not send (and ignore) break signal
n=1 Send break signal for 4 seconds before disconnect
n=0 Reset modem with SCP0
n=1 Reset modem with SCP1
n=0 RLSD remains ON at all times.
n=1 RLSD follows the state of the carrier.
TD-5612DCII Modem User's Manual
Chapter 3 The Modem AT commands
&Dn
&Fn
&Gn
&Ln
&Kn
&Mn
n=0 Alone with any of following &Q0, &Q5, &Q6 then, DTR is
not functional.
Alone with any of following &Q1, &Q4 then DTR drop causes
the modem hang up, Auto-answer is not affected.
Alone with any of following &Q2, &Q3 then DTR drop causes
the modem to hang up, Auto-answer is inhibited.
n=1 Alone with any of following &Q0, &Q1, &Q4, &Q5, &Q6 then
DTR drop is interpreted by the modem as if the asynchronous
escape sequence had been entered. The modem return to
asynchronous command state without disconnecting.
Alone with any of following &Q2, &Q3 DTR drop causes the
modem to hang up. Auto-Answer is inhibited.
n=2 Alone with any of following &Q0 through &Q6 then, DTR drop
causes the modem to hang up Auto-Answer is inhibited.
n=3 Alone with any of following &Q0, &Q1, &Q4, &Q5, &Q6 then,
DTR drop causes the modem to perform a soft reset as if the z
command were received. The &Y setting determines which profile
is loaded.
Alone with any of following &Q2, &Q3 then DTR drop causes the
modem to hang up Auto-Answer is inhibited
n=0 Restore factory default profile FDP0 (as ECDC modem)
n=1 Restore factory default profile FDP1 (as non-ECDC modem)
n=0 Disable guard tone
n=1 Disable guard tone
n=2 Enable 1800 HZ guard tone
n=0 Dial-Up line Operation
n=0 Disable flow control
n=3 RTS/CTS flow control
n=4 XON/XOFF flow control
n=5 Unidirectional XON/XOFF
n=6 RTS/CTS, XON/XOFF flow control
n=0 Set modem for asynchronous operation
n=1 Enter synchronous modem after asynchronous dialing
n=2 Synchronous terminal support. Modem dials a stored number and
enters synchronous modem when DTR off-to-on
n=3 Dial manually while DTR off, handshake proceeds when DTR
off-to-on.
TD-5612DCII Modem User's Manual
11
Chapter 3 The Modem AT commands
&Pn
n=0 Selects 39%-61% make/break ratio at 10 pulses per second.
(Default.)
n=1 Selects 33%-67% make/break ratio at 10 pulses per second.
n=2 Selects 39%-61% make/break ratio at 20 pulses per second.
n=3 Selects 33%-67% make/break ratio at 20 pulses per second.
n=0 Modem turns CTS on when detects RTS from the local computer
&Rn
n=1 Ignore RTS. Modem turns CTS on when ready to receive
synchronously
n=0 Modem forces DSR always on
&Sn
n=1 Set DSR to follow RS-232 spec
&Tn
n=0 Terminates test in progress
n=1 Initiates local analog loop back, V.34 Loop3, Sets S16 bit 0. If a
connection exists when this
command is issued, the modem hangs up, The connect XXXX
message is displayed upon the start of the test.
n=2 Returns ERROR.
n=3 Initiates local digital loop back, V.34 Loop2. Sets S16 bit 2. If no
connection exists.
ERROR is returned. Sets S16 bit 4 when test is in progress.
n=4 Enables digital loop back acknowledgment for remote request.
n=5 Disable digital loop back acknowledgment for request.
n=6 Requests a remote digital loop back, V.34 Loop 2, without self
test.
n=7 Requests a remote digital loop back (RDL), V.34 Loop 2, with self
test.
n=8 Initiates local analog loop back, V.34 Loop3, with self test.
&Vn
n=0 Display modem profiles and numbers
n=1 Display last connection statistics
&Wn
n=0 Write ACP to SCP0
n=1 Write ACP to SCP1
&Xn
n=0 Select internal clock
n=1 Select external clock
n=2 Select slave clock
&Yn
n=0 Designate SCP0 as the active SCP
n=1 Designate SCP1 as the active SCP
&Zn=X n=0-3 Save up to four numbers to NVRAM. "X" to Dial the stored
number
12
TD-5612DCII Modem User's Manual
Chapter 3 The Modem AT commands
Note: &X, &Mn: for Sync mode only.
Fixed DTE Rate
+IPR
Specifies the DTE-modem interface operation rate in bits/s. The
available rates are: 0, 300, 1200, 2400,
4800, 9600, 19200, 38400, 57600, 115200bits/s
Example: AT+IPR=9600
Modulation Selection
+MS
This extended-format compound parameter controls the manner of
operation of the modulation capabilities in the modem. It accepts six
subparameters.
Syntax:
+MS=[[,[,[,[, [,]]]]]]
Where possible , , , , and max_rx_rate>values are listed in Table .
Modulation

Bell 103
Bell 212
V.21
V.22
V.22 bis
V.23
V.32
V.32bis
V.34
B103
B212
V21
V22
V22B
V23C
V32
V32B
V34
V.90
V90
V.92 upstream
V92
V.92 downstream
V92
Possible (, , (),
and ) Rates (bps)
300
1200 Rx/75 Tx or 75 Rx/1200 Tx
300
1200
2400 or 1200
1200
9600 or 4800
14400,12000,9600,7200,or 4800
33600,32100,28800,26400,24000,21600,19200,16800,14400,
12000,9600,7200,4800, or 2400
56000,54667,53333,52000,50667,49333,48000,46667,45333,
44000,42667,41333,40000,38667,37333,36000,34667,33333,
32000,30667,29333,28000
48000,46667,45333,44000,42667,41333,40000,38667,37333,
36000,34667,33333,32000,30667,29333,28000,26667,25333,
24000
56000,54667,53333,52000,50667,49333,48000,46667,45333,
44000,42667,41333,40000,38667,37333,36000,34667,33333,
32000,30667,29333,28000
TD-5612DCII Modem User's Manual
13
Chapter 3 The Modem AT commands

A string which specifies the preferred modem carrier to use in
originating or answering a connection.  values are strings
of up to eight characters, consisting only of numeric digits and
upper case letters.  values for ITU standard modulations
take the form:
< 1-4 digits>. Defined values are
listed in Table.
 A numeric value which enables or disables automatic modulation
negotiation (e.g., ITU-T V.32bis Annex A or V.8).
0 = Automode disabled.
1 = Automode enabled. (Default.)
 and 
Numeric values which specify the lowest ()
and highest () rate at which the modem may
establish a receive connection. May be used to condition distinct
limits for the receive direction as distinct from the transmit
direction. Values for this subparameter are decimal encoded, in
units of bit/s. The possible values for each modulation are listed in
Table. Actual values will be limited to possible values
corresponding to the entered  and fall-back  as
determined during operation. (Default = lowest ()
and highest () rate supported by the selected carrier.)
 and 
Numeric values which specify the lowest () and
highest () rate at which the modem may establish a
transmit connection. Non-zero values for this subparameter are
decimal encoded, in units of bit/s. The possible values for each
modulation are listed in Table . Actual values will be limited to
possible values corresponding to the entered  and fallback  as determined during operation. (Default = lowest
() and highest () rate supported by
the selected carrier.)
Example: +MS= V92, 1,300,48000,300,56000
Reporting Current or Selected Values Command: +MS?
Response: +MS :,,, ,
,
Example:+MS: V92, 1,300,48000,300,56000
14
TD-5612DCII Modem User's Manual
Chapter 3 The Modem AT commands
Reporting Supported Range of Parameter Values Command: +MS=?
Response:+MS: (< carrier> range),( range),( range),
( range), ( range), ( range)
Example :+MS:(B103,B212,V21 ,V22,V22B,V23C,V32,V32B,V34, V90, V92),
(0,1),(300-33600),(300-48000),(300-56000),(300-56000)
3.4 Error Control/Data Compression Commands
+ES - Error Control and Synchronous Mode Selection
This extended-format command specifies the initial requested mode of
operation when the modem is operating as the originator, optionally specifies
the acceptable fallback mode of operation when the modem is operating as
the originator, and optionally specifies the acceptable fallback mode of
operation when the modem is operating as the answerer. It accepts three
numeric subparameters:
Syntax
+ES=[[,[,]]]
Defined Values
 Decimal number which specifies the initial requested mode of
operation when the modem is operating as the originator. The options
are:
0 Initiate call with Direct Mode.
1 Initiate call with Normal Mode (also referred to as Buffered Mode)
only.
2 Initiate V.42 without Detection Phase. If V.8 is in use, disable V.42
Detection Phase.
3 Initiate V.42 with Detection Phase. (Default.)
4 Initiate MNP.
6 Initiate V.80 Synchronous Access Mode when connection is
completed, and Data State is entered. (See +ESA and +ITF
commands.)
7 Initiate Frame Tunneling Mode when connection is complete, and
Data Mode is entered.
 Decimal number which specifies the acceptable fallback mode of
operation when the modem is operating as the originator.
TD-5612DCII Modem User's Manual
15
Chapter 3 The Modem AT commands

Examples
+ES=6
+ES=6
+ES=,,8
+ES=6,,8
+ES=3
+ES=,,2
+ES=3,,2
16
0 LAPM, MNP, or Normal Mode error control optional. (Default.)
1 LAPM, MNP, or Direct Mode error control optional.
2 LAPM or MNP error control required; disconnect if error control
is not established.
3 LAPM error control required; disconnect if error control is not
established.
4 MNP error control required; disconnect if error control is not
established.
Decimal number which specifies the acceptable fallback mode of
operation when the modem is operating as the answerer or specifies
V.80 Synchronous Access Mode.
0 Direct Mode.
1 Error control disabled, use Normal Mode.
2 LAPM, MNP, or Normal Mode error control optional. (Default.)
3 LAPM, MNP, or Direct Mode error control optional.
4 LAPM or MNP error control required; disconnect if error control
is not established.
5 LAPM error control required; disconnect if error control is not
established.
6 MNP error control required; disconnect if error control is not
established.
7 Initiate V.80 Synchronous Access Mode when connection is
completed, and Data State is entered (see +ESA and +ITF
commands).
8 Initiate Frame Tunneling Mode when connection is complete,
and Data Mode is entered.
Enable V.80 Synchronous Access Mode originator.
Enable V.80 Synchronous Access Mode originator.
Enable V.80 Synchronous Access Mode answerer.
Enable V.80 Synchronous Access Mode originator and answerer.
Enable V.42 with Detection Phase originator. Disable V.80
Synchronous Access Mode originator.
Allow LAPM, MNP, or Normal Mode connection answerer. Disable
V.80 Synchronous Access Mode answerer.
Enable V.42 with Detection Phase originator, allow LAPM, MNP, or
Normal Mode connection answer. Disable Synchronous Access Mode
originator and answerer.
TD-5612DCII Modem User's Manual
Chapter 3 The Modem AT commands
+EB - Break Handling in Error Control Operation
This extended-format compound parameter controls the break handling in
V.42 operation. It accepts three numeric subparameters:
Syntax
+EB=[[,[,]]]
Defined Values



Decimal number 0 specifying that break is to be ignored, i.e.,
not signaled to remote DCE.
Decimal number 0 specifying that any transmitted V.42 L SIGNAL will not indicate break signal length
Decimal number 0 specifying that break is not delivered to the
DTE.
+ESR - Selective Repeat
This extended-format numeric parameter controls the use of the selective
repeat (SREJ) option in V.42.
Syntax
+ESR=[]
Decimal number 0 specifying that SREJ is not used.
+EFCS - 32-bit Frame Check Sequence
This extended-format numeric parameter controls the use of the 16-bit or
32-bit frame check sequence (FCS) option in V.42.
Syntax +EFCS=[]
Defined Values
Decimal number 0 specifying the use of the 16-bit FCS specified in V.42.
+ER - Error Control Reporting
This extended-format numeric parameter controls whether or not the
extended-format +ER: intermediate result code is transmitted from the
modem to the DTE.
S95 bit 3 is reset to 0 for +ER=0 and is set to a 1 for +ER=1. The more
recent setting of +ER or S95 bit 3, and the W command setting, determines
the actual error control result code reporting (see S95 Parameter and W
Command).
Syntax
+ER=[]
Defined Values
TD-5612DCII Modem User's Manual
17
Chapter 3 The Modem AT commands
 A decimal number corresponding to the selected error control option:
0 =Error control reporting disabled (no +ER intermediate result code
transmitted).
1 =Error control reporting enabled (+ER intermediate result code
transmitted).
+ETBM - Call Termination Buffer Management
This extended-format compound parameter controls the handling of data
remaining in modem buffers upon call termination. It accepts three
numeric subparameters:
Syntax
+ETBM=[[,[,]]]
Defined Values
 Decimal number 0 specifying that disconnect will occur
immediately and all buffered transmit data will be discarded
when the local DTE requests call disconnection.
 Decimal number 0 specifying that disconnect will occur
immediately and all buffered receive data will be discarded when
the local DTE requests call disconnection.

Decimal number 0 specifying that the modem will not attempt to
deliver the buffered data before abandoning the attempt and
discarding remaining data.
\B - Transmit Break to Remote
In non-error correction mode, the modem will transmit a break signal to the
remote modem with a length in multiples of 100 ms according to parameter
specified. If a number in excess of 9 is entered, 9 is used. The command
works in conjunction with the \K command.
Syntax
\B
Defined Values

Decimal number corresponding to the selected option.
1-9Break length in 100 ms units. (Default = 3.) (Non-error corrected mode only.)
\K - Break Control
Controls the response of the modem to a break received from the DTE or the
remote modem or the \B command. The parameter value, if valid, is written to S40
bits 3, 4, and 5.
18
TD-5612DCII Modem User's Manual
Chapter 3 The Modem AT commands
Syntax
\K
Defined Values
 Decimal number corresponding to the selected option. The response is
different in three separate states.
The first state is where the modem receives a break from the DTE when the
modem is operating in data transfer mode:
Enter on-line command mode, no break sent to the remote modem.
Clear data buffers and send break to remote modem.
Same as 0.
Send break to remote modem immediately.
Same as 0.
Send break to remote modem in sequence with transmitted data. (Default.)
The second case is where the modem is in the on-line command state (waiting for
AT commands) during a data connection, and the \B is received in order to send a
break to the remote modem:
Clear data buffers and send break to remote modem.
Clear data buffers and send break to remote modem. (Same as 0.)
Send break to remote modem immediately.
Send break to remote modem immediately. (Same as 2.)
Send break to remote modem in sequence with data.
Send break to remote modem in sequence with data. (Same as 4.) (Default.)
The third case is where a break is received from a remote modem during a nonerror corrected connection:
Clears data buffers and sends break to the DTE.
Clears data buffers and sends break to the DTE. (Same as 0.)
Send a break immediately to DTE.
Send a break immediately to DTE. (Same as 2.)
Send a break in sequence with received data to DTE.
Send a break in sequence with received data to DTE. (Same as 4.) (Default.)
-K - MNP Extended Services
Enables or disables conversion of a V.42 LAPM connection to an MNP 10
connection. The parameter value, if valid, is written to S40 bits 0 and 1.
Syntax
-K
Defined Values
TD-5612DCII Modem User's Manual
19
Chapter 3 The Modem AT commands
Decimal number corresponding to the selected option.
0 Disables V.42 LAPM to MNP 10 conversion. (Default.)
1 Enables V.42 LAPM to MNP 10 conversion.
2 Enables V.42 LAPM to MNP 10 conversion; inhibits MNP Extended Services
initiation during V.42 LAPM answer mode detection phase.
+DS - Data Compression
This extended-format compound parameter controls the V.42bis data
compression function if provided in the modem. It accepts four numeric
subparameters:
Syntax
+DS=[[,[,[,]]]] Defined Values

Specifies the desired direction(s) of operation of the data
compression function; from the DTE point of view.
0 Negotiated; no compression (V.42bis P0=0).
3 both directions, accept any direction (V.42bis P0=11). (Default.)
 Specifies whether or not the modem should continue to operate if
the desired result is not obtained.
0 Do not disconnect if V.42bis is not negotiated by the remote
modem as specified in .

Specifies the maximum number of dictionary entries (2048 entries)
which should be negotiated (may be used by the DTE to limit the
codeword size transmitted, based on its knowledge of the nature
of the data to be transmitted).
 Specifies the maximum string length (32 bytes) to be negotiated
(V.42bis P2).
+DS44 - V.44 Compression Select
This extended-format compound parameter controls the V.44 data compression
function.
Syntax
+DS44=[[,< compress_negotiation >[,[, [,[,[,[, [,]]]]]]]]]
Defined Values
Decimal number that specifies the desired direction(s) of

operation of the data compression function; from the DTE point
of view.
20
TD-5612DCII Modem User's Manual
Chapter 3 The Modem AT commands
Negotiated, no compression.
Transmit only.
Receive only.
Both directions, accept any direction. (Default.)
 Decimal number that specifies whether or not the modem
should continue to operate if the desired result is not
obtained.
0 Do not disconnect if V.44 is not negotiated by the remote DCE as
specified in . (Default.)
1 Disconnect if V.44 is not negotiated by the remote DCE as
specified in .
Decimal number that specifies the use of stream method, packet
method, multi-packet method.
0 Stream method. (Default.)
1 Packet method.
2 Multi-packet method.
 Decimal number from 256 to 2048 that specifies the
maximum number of codewords which should be
negotiated in the transmit direction. (Default = 2048.)
 Decimal number from 256 to 2048 that specifies the
maximum number of codewords which should be
negotiated in the receive direction. (Default = 2048.)




Decimal number from 32 to 255 that specifies the maximum
string length to be negotiated in the transmit direction.
(Default=32.)
Decimal number from 32 to 255 that specifies the maximum
string length to be negotiated in the receive direction.
(Default=32.)
Decimal number from 2048 to 4096 that specifies the
maximum size of the history buffer to be negotiated in the
transmit direction. (Default = 4096.)
Decimal number from 2048 to 4096 that specifies the
maximum size of the history buffer to be negotiated in the
receive direction. (Default = 4096.)
TD-5612DCII Modem User's Manual
21
Chapter 3 The Modem AT commands
+DR - Data Compression Reporting
This extended-format numeric parameter controls whether or not the
extended-format +DR: intermediate result code is transmitted from the
modem to the DTE.
S95 bit 5 is reset to 0 for +DR=0 and is set to a 1 for +DR=1. The more
recent setting of +DR or S95 bit 5, and the W command setting, determines
the actual data compression result code reporting (see S95 Parameter and W
Command).
Syntax
+DR=[]
Defined Values
 decimal number corresponding to the selected option:
Data compression reporting disabled (no +DR result code
transmitted).
Data compression reporting enabled (+DR result code transmitted).
(Default.)
%C - Enable/Disable Data Compression
Enables or disables data compression negotiation. The modem can only
perform data compression on an error corrected link. The parameter value, if
valid, is written to S41 bits 0 and 1.
Syntax
%C
Defined Values

22
Decimal number corresponding to the selected option.
0 Disables data compression. Resets S46 bit 1.
1 Enables MNP 5 data compression negotiation. Resets S46 bit 1.
2 Enables V.42 bis data compression. Sets S46 bit 1.
3 Enables both V.42 bis and MNP 5 data compression. Sets S46 bit 1.
(Default.)
TD-5612DCII Modem User's Manual
Chapter 3 The Modem AT commands
3.5 S-Register Summary
Register
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S14
S16
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
S31
S36
S37
S38
S39
S40
S41
S46
S48
S86
S91
S92
S95
S210
Function
Rings to Auto-Answer
Ring Counter
Escape Character
Carriage Return Character
Line Feed Character
Backspace Character
Wait Time before Blind Dialing or for Dial Tone
Wait Time for Carrier, Silence, or Dial Tone
Pause Time for Dial Delay Modifier
Carrier Detect Response Time
Lost Carrier To Hang Up Delay
DTMF Tone Duration
Escape Prompt Delay (EPD)
General Bit Mapped Options Status
Test Mode Bit Mapped Options Status
V.24/General Bit Mapped Options Status
Speaker/Results Bit Mapped Options Status
General Bit Mapped Options Status
Sleep Inactivity Timer
Delay to DTR Off
RTS-to-CTS Delay
General Bit Mapped Options Status
General Bit-Mapped Options Status
Flash Dial Modifier Time
Disconnect Inactivity Timer
General Bit-Mapped Options Status
LAPM Failure Control
Line Connection Speed n=0~12
Auto mode connection（F0）
1-3
300（F1）
Reserved
1200（F4）
2400（F5）
300/ 1200V.23（F3）
4800（F6）
9600（F8）
10
12000（F9）
11
14400（F10）
12
7200（F7）
Delay Before Forced Hangup
Flow Control Bit Mapped Options Status
General Bit-Mapped Options Status
General Bit-Mapped Options Status
Data Compression Control
V.42 Negotiation Control
Call Failure Indication
PSTN Transmit Attenuation Level
Fax Transmit Attenuation Level
Extended Result Codes Control
V.34 Symbol Rate
TD-5612DCII Modem User's Manual
Range
0-255
0-255
0-255
0-127
0-127
0-255
2-255
1-255
2-255
1-255
1-255
50-255
0-255
0-255
0-255
0-255
0-255
0-255
Units
Default**
rings
rings
43
ASCII
13
ASCII
10
ASCII
ASCII
50
0.1 s
14
0.1 s
95
0.001 s
50
0.02 s
138 (8Ah)
52 (34h)
117 (75h)
s or 0.01 s 5
0.01 s
73 (49h)
70
10 ms
10 s
192 (C0h)
0-255
0-26
0-15
0-15
0-255
dBm
dBm
20
104 (68h)
195 (C3h)
138
21
10
10
13 (0Dh)
23
Chapter 3 The Modem AT commands
3.6 Result Codes
Short Form
+F4
10
11
12
13
14
15
16
17
18
19
20
22
23
24
25
32
33
35
39
40
42
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
61
62
24
Long Formn
+FCERROR
OK
CONNECT
RING
NO CARRIER
ERROR
CONNECT 1200
NO DIAL TONE
BUSY
NO ANSWER
CONNECT 600
CONNECT 2400
CONNECT 4800
CONNECT 9600
CONNECT 7200
CONNECT 12000
CONNECT 14400
CONNECT 19200
CONNECT 38400
CONNECT 57600
CONNECT 115200
CONNECT 230400
CONNECT 75TX/1200RX
CONNECT 1200TX/75RX
DELAYED
MESSAGE-WAITING
BLACKLISTED
FAX
DATA
+MRR: 75
+MRR: 300
+MRR: 600
+MRR: 1200/75
+MRR: 75/1 200
+MRR: 1200
+MRR: 2400
+MRR: 4800
+MRR: 7200
+MRR: 9600
+MRR: 12000
+MRR: 14400
+MRR: 16800
+MRR: 19200
+MRR: 21600
+MRR: 24000
+MRR: 26400
+MRR: 28800
CONNECT 16800
CONNECT 21600
CONNECT 24000
n Value in ATXn Command
Notes
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
TD-5612DCII Modem User's Manual
Chapter 3 The Modem AT commands
Short Form
63
64
66
67
68
69
70
77
78
79
80
81
81
83
84
85
86
87
91
130
134
135
136
137
138
139
139
140
141
142
145
145
146
147
150
151
152
153
154
155
156
157
158
159
160
161
162
165
166
167
168
169
170
Long Formn
CONNECT 26400
CONNECT 28800
+DR: ALT
+DR: V42B
+DR: V44
+DR: NONE
+ER: NONE
+ER: LAPM
+MRR: 31200
+MRR: 33600
+ER: ALT
+ER: ALT-CELLULAR
+ER: ALT - CELLULAR
LINE IN USE
CONNECT 33600
OFF-HOOK INTRUSION
LINE REVERSAL DETECTED
NO LINE
CONNECT 31200
+ILRR
+MCR: B103
+MCR: B212
+MCR: V21
+MCR: V22
+MCR: V22B
+MCR: V23
+MCR: V23C
+MCR: V32
+MCR: V32B
+MCR: V34
+MCR: V90
+MCR: V90
+MCR: V92
+MCR: V29
+MRR: 32000
+MRR: 34000
+MRR: 36000
+MRR: 38000
+MRR: 40000
+MRR: 42000
+MRR: 44000
+MRR: 46000
+MRR: 48000
+MRR: 50000
+MRR: 52000
+MRR: 54000
+MRR: 56000
CONNECT 32000
CONNECT 34000
CONNECT 36000
CONNECT 38000
CONNECT 40000
CONNECT 42000
TD-5612DCII Modem User's Manual
n Value in ATXn Command
Notes
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
25
Chapter 3 The Modem AT commands
Short Form
171
172
173
174
175
176
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
Notes:
Long Formn
CONNECT 44000
CONNECT 46000
CONNECT 48000
CONNECT 50000
CONNECT 52000
CONNECT 54000
CONNECT 28000
CONNECT 29333
CONNECT 30667
CONNECT 33333
CONNECT 34667
CONNECT 37333
CONNECT 38667
CONNECT 41333
CONNECT 42667
CONNECT 45333
CONNECT 46667
CONNECT 49333
CONNECT 50667
CONNECT 53333
CONNECT 54667
+MRR: 28000
+MRR: 29333
+MRR: 30667
+MRR: 33333
+MRR: 34667
+MRR: 37333
+MRR: 38667
+MRR: 41333
+MRR: 42667
+MRR: 45333
+MRR: 46667
+MRR: 49333
+MRR: 50667
+MRR: 53333
+MRR: 54667
+MRR: 25333
+MRR: 26667
+MRR: 25333
+MRR: 22666
DIGITAL LINE DETECTED
n Value in ATXn Command
Notes
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
Note 3
1. An 'x' in a column indicates that the message (either the long form if verbose, or the value only for short
form) will be generated when that particular value of 'n' (shown at the top of the column) has been selected by
the use of ATXn. If the column is blank, then no message will be generated for that x option. A numeral
indicates which less explicit message (verbose or short form) will be output for that X option. (Also, see
Section 3.3).
2. V.34, V.90, and V.92 models only.
3. V.90 and V.92 models only.
26
TD-5612DCII Modem User's Manual
Chapter 4 Troubleshooting
Chapter 4 Troubleshooting
Your modem is designed to provide years of ultra high speed satisfaction. In the
unlikely event of you encountering problems using your modem, the tips in this
section will help you to identify and resolve them. Most modem problems are a
result of incorrect cabling or settings within your communications or fax software.
This section provides a list of more common problems that you may encounter,
followed by likely solutions.
4.1 AT Command Set Problems
Problem
Your modem does not respond to AT commands.
Solutions
1. Make sure the DTR LED is ON. If it is OFF, make sure your communications
software is using the same COM port as your modem.
2. Check to see that your modem's COM port is not already assigned to another
installed serial device, such as a mouse or laser printer.
Problem
Your modem fails to execute AT commands.
Solutions
1. Make sure the DTR LED is ON. If it is OFF, make sure your communications
software is using the same COM port as your modem.
2. You may have omitted the characters AT from the beginning of the command
line. These characters must appear at the beginning of each command line.
3. You may have typed the commands when your modem was in data state instead
of the command state. To switch from data state to command state, type the
escape sequence code +++. To return to the data state, type ATO and press
Enter.
Problem
You typed an AT command, but did not receive an OK or 0 result code.
Solutions
1. Your communications software may be using a different COM port than your
modem. Be sure both the software and your modem are addressing the same
COM port.
TD-5612DCII Modem User's Manual
27
Chapter 4 Troubleshooting
2. The E0 and Q1 commands may be in effect, disabling echo and result codes.
To verify this in terminal mode, type AT&V0 and press Enter with the modem
in command state to view the currently active settings. To enable echo and
result codes, type AT E1 Q0 and press Enter.
3. You may have typed the commands when your modem was in the data state
instead of the command state. To switch from data state to command state, type
the escape sequence code +++. To return to data state, type ATO and press
Enter.
Problem
You receive the ERROR result code after typing an AT command.
Solution
You may have typed a command that is not recognized by your modem or
communications software.
4.2 Command Echo Problems
Problem
You do not see any typed characters on your computer screen.
Solutions
1. Make sure the DTR LED is ON. If it is OFF, make sure your communications
software is using the same COM port as your modem.
2. Neither your modem nor your communications software is configured to echo
characters. Use the E1 command to enable modem echo, or turn on your
software program's Echo (or duplex) feature.
Problem
Each character you type appears twice on your computer screen.
Solution
Both your modem and your communications software are echoing characters to
your screen. Use the E0 command to disable modem echo, or turn off your
software program's echo (or duplex) feature.
4.3 Auto-Answer Problems
Problem
Your modem does not auto-answer incoming calls.
Solutions
28
TD-5612DCII Modem User's Manual
Chapter 4 Troubleshooting
1. Make sure the supplied telephone cable is connected to your modem's LINE
jack and not the PHONE jack.
2. Your modem may not be set up for auto-answer. With the modem in command
state, type ATS0=1 and press Enter to have the modem answer on the first
incoming ring To auto-answer after a specific number of rings, replace 1 with a
value up to 255. Do not assign a value of 0, which turns off auto-answer,
unless your software can respond to the modem's RING result codes.
3. Check that the DTR LED is ON, and that the AA LED flickers with each
incoming ring. If the LEDs do not respond in this way, refer to you
User's Manual.
4. Set &D0 and auto answer, if your modem is not connected to RS232 or DTR is
not ready.
Problem
When you receive a phone call, your modem immediately seizes control of the
telephone line.
Solution
Your modem may be configured for auto-answering. To disable auto-answer, type
ATS0=0 and press Enter with the modem in command state.
4.4 Dialing Problems
Problem
Your modem does not dial calls.
Solutions
1. Make sure the supplied telephone cable is connected to your modem's LINE
jack and not the PHONE jack.
2. You are using touchtone dialing on a line that requires pulse dialing. Change
your communications software to use pulse dialing.
3. Unplug the telephone line cable from the computer and connect it directly to a
telephone handset. Check for dial tone. If there is none, the problem is in the
telephone line. Call the service provider.
4.5 Data Transfer Problems
Problem
You can make a data connection with a remote modem, but encounter frequent
errors during data transfers.
TD-5612DCII Modem User's Manual
29
Chapter 4 Troubleshooting
Solutions
1. Re-dial the call. (The telephone connection may be poor.)
2. Your modem and communications software may be configured for different
flow control methods. Be sure your modem and software are both using
hardware (RTS/CTS) flow control or software (XON/XOFF) flow control.
3. To verify that your modem and communications software are using the same
flow control method, type AT&T8 and press the Enter key with your modem in
the command state. You should see a smooth "stair-stepping" ASCII test
pattern flowing diagonally across your screen.
4.6 Connection Problems
Problem
Your modem disconnects while communicating with a remote system.
Solutions
1. The remote system may have hung up. Type ATI2 and press Enter to view the
link status report, which will include the reason for the disconnect. For
information on understanding this report, refer to your
User's Manual.
You may have subscribed to Call Waiting and received an incoming call that
interrupted your data connection. See your telephone directory for information on
disabling Call Waiting.
30
TD-5612DCII Modem User's Manual
FCC STATEMENT
1. This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including
interference that may cause undesired operation.
2. Changes or modifications not expressly approved by the party
responsible for compliance could void the user’s authority to operate the
equipment.
NOTE: This equipment has been tested and found to comply with the limits
for a Class B digital, pursuant to Part 15 or the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may casue harmful interference to radio communications,
However, there is no guarantee that interference will not occur in a particular
installation. If the equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
--- Reorient or relocate the receiving antenna.
--- Increase the separation between the equipment and receiver.
--- Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
--- Consult the dealer or an experienced radio/ TV technician for help.
TD-5612DCII Modem User's Manual
31

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