Racal Vadic_18008 049_VA811_Automatic_Calling_Unit_Installation_Operation_Manual_May1985 Vadic 18008 049 VA811 Automatic Calling Unit Installation Operation Manual May1985

User Manual: Racal-Vadic_18008-049_VA811_Automatic_Calling_Unit_Installation_Operation_Manual_May1985

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Racal-Vadic
VA811 AUTOMATIC CALLING UNIT
INSTALLATION/OPERATION
MANUAL

ml3~m[J
The Electronics Group

Publication Number 18008-049

VA811 AUTOMATIC CALLING UNIT
INSTALLATION/OPERATION
MANUAL

REPRINTED
MAY 1985

Racal-Vadic offers a free, call-in diagnostic service to assist in the operation and testing of all Racal-Vadic
products. Racal-Vadic Diagnostic Center personnel are available to perform free, over-the-telephone diagnostic
tests of malfunctioning equipment, to clarify options and test procedures outlined in this manual, and
to describe the operation of the controls and indicators on Racal-Vadic products. Call the Racal-Vadic
Diagnostic Center before shipping any equipment in for repair.
TOLL-FREE NUMBER

(800) 22-VADIC

or
(800) 228-2342

When using this product outside the continental U.S. or Canada, please call your local distributor regarding any problems.

The information in this manual has been carefully compiled and checked for technical accuracy. However,
Racal-Vadic accepts no responsibility for inaccuracies which may occur. Comments or correspondence
regarding this manual should be addressed to:
Racal-Vadic
Corporate Communications Department
1525 McCarthy Boulevard
Milpitas, California 95035 U.S.A.
Tel. (408) 946-2227
TWX: 4112-62782187

FCC REQUIREMENTS
Connection of terminal equipment to the public switched-telephone network is regulated by the Federal
Communications Commission (FCC) as defined by FCC Rules and Regulations, Part 68. These regulations
require the following:
1. Before connecting this equipment to the switched-telephone network, 1 notify the telephone company

of the following information:
RACAL-VADIC
Name of Manufacturer
Equipment Model Number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. VA811-PS/SS
AJ496M-68137-DI-E
FCC Registration Number
O.OB
Ringer Equivalence Number
If other devices are to be connected with this equipment, equivalent information must be provided for
each device.
2. When trouble is experienced, disconnect this equipment from the telephone line to determine if it is

malfunctioning. If this equipment is determined to be malfunctioning, discontinue use until the
problem has been corrected. 2
~

3. Where such action is reasonably required in the operation of its business, the telephone company
may make changes in its communications facilities, equipment, operations, and procedures. If this
occurs, you will be notifed by the telephone company in writing.

Connection of this equipment to party lines and coin telephone service is prohibited.
Should this equipment cause harm to the telephone network, the telephone company may temporarily
discontinue service until the problem has been corrected.

WARNING
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with the instructions manual, may cause interference to radio communications. It has been
tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of Part
15 of FCC Rules, which are designed to provide reasonable protection against such interference when
operated in a commercial environment. Operation of this equipment in a residential area is likely to cause
interference; the user will be required to take whatever measures may be required at his own expense
to correct the interference.

CANADIAN DEPARTMENT OF COMMUNICATIONS
REQUIREMENTS FOR END USERS

,.~.
.

~!.~"

This equipment is certified by the Canadian Department of Communications, meeting telecommunications requirements for safety, operation, and telephone network protection. The Department does not
guarantee satisfactory equipment operation. When installing this equipment:
1. Be sure your local telecommunications company allows you to connect your equipment to its lines.
2. Use approved connectors. Most companies prohibit using customer-supplied jacks. If using a single

line, you may be able to use a telephone extension cord.
3. Electrical ground connections for the power utility lines, telephone lines, and internal metallic water

pipes are connected together, particularly in rural areas. DO NOT ATTEMPT TO MAKE GROUND
CONNECTIONS YOURSELF. Contact the appropriate electrical inspection authority or electrician.
4. Any equipment malfunctions, or repairs or alterations you make to this equipment, may cause the
telecommunications company to ask you to disconnect the equipment. All repairs to this equipment
should be made by an authorized Canadian maintenance facility designated by the suppliers.
NOTE: Compliance with the above conditions may not prevent degradation of services in some situations.

The Canadian Department of Communications requires the certification of all cables used to connect
modems to the telephone line. The following cables are certified for use on the VA811 Automatic Calling
Unit:
Cable Description

Racal-Vadic
Part No.

Canadian
DOC No.

7-foot permissive
7-foot programmable

15047-004
15048-004

CAllA
CA45A

TABLE OF CONTENTS
SECTION 1

GENERAL INFORMATION
INTRODUCTION
FEATURES
CABLE INFORMATION
PHYSICAL DESCRIPTION
CONFIGURATIONS
Single-line
Multiline

1-1
1-1
1-1
1-1
1-2
1-2
1-2
1-4

SECTION 2

OPTIONS
INTRODUCTION
OPTION DESCRIPTIONS
Single-line/Multiline Options
Interconnect Options
Operating Protocol Options

2-1
2-1
2-1
2-1
2-2
2-2

SECTION 3

INSTALLATION
INTRODUCTION
PRELIMINARY PROCEDURES
Unpacking and Inspection
Equipment Supplied
Additional Equipment Required
Preinstallation Checks
VA811-PS/SS INSTALLATION
VA811-XM INSTALLATION

3-1
3-1
3-1
3-1
3-2
3-2
3-2
3-3
3-4

SECTION 4

CHECKOUT AND OPERATION
INTRODUCTION
CHARACTER SET
EXAMPLE CALLS
CONTROLS AND INDICATORS
OPERATIONAL CHECKOUT
VA811-PS/SS
VA811-XM

4-1
4-1
4-2
4-4
4-4
4-6
4-6
4-7

SECTION 5

SUPPLEMENTAL INFORMATION
INTRODUCTION
EQUIPMENT INTERFACES
LINE INTERFACE
Introduction
RS366 INTERFACE
Introduction
RS366 Signal Descriptions
RS366 Protocol
CHASSIS INTERFACE

5-1
5-1
5-1
5-2
5-2

SPECIFICATIONS

5-4
5-4

5-4
5-7
5-8
5-11

LIST OF TABLES
Table 2-1

VA8110ptions

. 2-4

Table 3-1

Equipment Supplied

. 3-2

Table 3-2

Additional Equipment Required

. 3-2

Table 4-1

Telephone Digits

. 4-2

Table 4-2

Dialer Address/Modem Type

. 4-3

Table 4-3

Modem (Slot) Address

. 4-3

Table 4-4

Controls and Indicators

. 4-5

Table 5-1

RJllC Connector Pin Assignments

. 5-2

Table 5-2

RJ41S,45S Connector Pin Assignments

. 5-3

Table 5-3

TelCo Interface Signal Definitions

. 5-3

Table 5-4

RS366 Interface Connector (J5)

. 5-6

Table 5-5

RS366 Interface Dial Sequence

. 5-7

Table 5-6

RS366 Interface Address Sequence (MACS only)

. 5-8

Table 5-7

Edge Connector Pin Assignments (Pi)

. 5-9

LIST OF FIGURES
Figure 1-1

Basic Single-line Dialer Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-2

Figure 1-2

Single-line Dialer with VA831 Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-3

Figure 1-3

Multiline Dialer (MACS) Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-4

Figure 2-1

VA811 Switch and Strap Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-4

Figure 3-1

VA811-PS/SS (SLD) Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-3

Figure 3-2

VA811-XM (MACS) Connections

Figure 4-1

Diagnostic Display Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-5

Figure 5-1

RS366 Interface Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-4

vii

3-4

Section 1
GENERAL INFORMATION
INTRODUCTION

The VA811 Automatic Calling Unit is a single-line/multiline automatic
dialer that allows a computer to initiate calls through an RS366 interface
(or through a standard RS232C interface when the VA831 adapter is
used). The VA811, available in three basic configurations listed below,
replaces both Bell 801 and RACAL-VADIC VA821 ACUs:
• VA811-PS single-line version supplied with a P-type (permissive
direct-connect) cable.
• VA811-SS single-line version supplied with an S-type (programmable
direct-connect) cable.
• VA811-XM multiline version for use in the RACAL-VADIC Multiline
Automatic Calling System (MACS).

FEATURES

The VA811 provides many standard and optional features that allow
custom tailoring to fit the needs of a particular installation. Features
available on this unit include:
• Switched-network (DDD) and teletype (TWX) compatible
• Automatic selection of pulse or tone dialing
• Positive dial tone, answer tone, and busy signal detection
• Tandem-dial and blind-dial capability
• Selectable automatic call and retry (ACR) control
• End-of-number and invalid-digit detect options
• Compatible with RACAL-VADIC direct-connect series modems, MACS,
and single-line chassis
• Extensive user diagnostics capability

CABLE
INFORMATION

The following cable has been certified for use with this dialer.
Racal-Vadic Part Number

15047-004

Government of Canada
DOC Old Connector Code

H473185

DOC New Connector Code

CAllA

(U se this code and the part

number for any communications
or ordering information from
Racal-Vadic.)
Description:

ft (P type)

6 position modular

(voice or data-perm)
T, R
1-1

PHYSICAL
DESCRIPTION

The VA811 dialer consists of a single-width printed circuit board (PCB)
assembly that occupies one card slot in RACAL-VADIC VA1601-,
VA1616.. , or VA1680-series chassis. The dialer accepts dc power and
interfaces to the chassis controls and indicators via the standard cardedge connector located at one end of the PCB. A 25-pin female connector
mounted on the rear panel of the unit provides an EIA RS366 connection
to the computer (data terminal equipment) and a corresponding 25-pin
male connector provides buffered expansion capability (daisy-chain) for
up to three additional dialers (in a MACS system). Two miniature 8position telephone (TelCo) jacks provide line connection to the modem
and to the sWitched-telephone network for single-line application.

CONFIGURATIONS

The VA811 dialer will operate as either a single-line (SLD) or a multiline
(MACS) dialer, depending on the internal option settings selected at the
factory (per dialer type ordered). Typical SLD and MACS equipment
configurations are discussed below.

Single-line

The minimum equipment configuration necessary for single-line operation is shown in Figure 1-1. As indicated in the figure, the dialer connects
to the computer via an RS366 interface and connects directly to the
telephone (TelCo) line with the supplied cable. The associated modem
connects to the computer via an RS232C interface and connects to the
TelCo line via the dialer. In this configuration, the dialer interrupts the
modem line connection during the dial sequence, then transfers control
to the modem via the telephone line.
COMPUTER
(DTE)

jRS366I1F

RS366
PORT

TELCO
LINE IfF

VA8ll
DIALER
~

RS232C
PORT

MODEM

......

VA811·02

Figure 1-1. Basic Single-line Dialer Configuration

1-2

If an optional VA831 adapter is used, the dialer may be connected for
either dual- or single-port operation as shown in Figure 1-2. Modem line
connection is identical to that described above, but the VA831 adapter
eliminates the need for an RS366 interface at the computer.
COMPUTER
(DTE)
RS366I/F

RS232C IIF

RS232C
PORT

VA831B
ADAPTER

TELCO
LIN E IIF

VA8ll
DIALER
~

RS232C IIF

RS232C
PORT

MODEM

•
-10...--

--...-

•
•

-v
-I-'

•
•
•
•
•
RS232C
PORT

RS3661/F

RS232C ifF
---+

VA831B
ADAPTER

0+---

•
•
•
•
•

VA8ll
DIALER

TELCO
LIN E IIF
~

MODEM

4--

VA811·0J

Figure 1-2. Single-line Dialer with VA831 Adapter

1-3

Multiline

For multiline dialer operation, the dialer and associated modems are
normally connected as shown in Figure 1-3. As indicated in the figure,
the dialer connects to the computer via the VA831 adapter (or directly to
an RS366 port, if the adapter is not used) and controls up to 15 1 modems
via the MACS chassis interface. Each modem connects to a separate
RS232C port at the computer, and each modem connects directly to the
telephone line. In this configuration, the dialer can address any of the
modems via the chassis interface, inhibit the modem line connection,
dial through the modem line interface, then transfer line control to the
modem.

COMPUTER
(DTE)

RS232C
PORT

VA831A
ADAPTER

RS366 IfF

VA811
DIALER

CHASSIS INTERF ACE

MODEM

TELCO
LINE IfF

RS232C
PORT

•
•
r-~

•
•

-I.,...-

-,--,

-I'-"

-I'-'"

•

•
•
•
•
•

----..
MODEM

--...

RS232C
PORT

TEL CO
LINE IfF

VA811-04

Figure 1-3. Multiline Dialer (MACS) Configuration

When the VA811 dialer and VA831 adapter are installed in the same
chassis, only 14 slots are available for modems. Up to three additional
dialers, each controlling up to 15 modems, may be daisy-chained via
the RS366 expansion connector provided on the VA811.

1-4

Section 2
OPTIONS
INTRODUCTION

The VA811 dialer may be configured to meet the needs of a particular
installation by selecting appropriate hardware options on the printed
circuit board assembly. Options typically changed onsite are implemented with DIP switches Al-A8 and Bl-B8; less commonly changed
options are implemented with solder straps (jumpers) a-x. Figure 2-1 and
Table 2-1 at the end of this section indicate the location and function of
switches and straps, and a brief description of each option is presented
below.
NOTE: The VA811 is configured for "standard" single-line or multiline
operation when shipped from the factory, as indicated in Table
2-1. Before installing the unit, it would be prudent to read the
option descriptions, mark Table 2-1 with the settings necessary
for your installation, then verify the switch and strap settings
selected on the board.

OPTION
DESCRIPTIONS

The seemingly endless array of switches and straps used on the VA811
can be categorized by function into three basic groups:
• Those that configure the dialer for single-line (SLD) or multiline
(MACS) operation.

• Those that relate to interconnecting the dialer to external equipment.
• Those that establish the operating protocol of the dialer.
Each group of options is described below.

Single-line/
Multiline
Options

Dialer Type (Al, f, g, h, j, k, 1, s, t, u, v, w)-This option selects either
single-line or multiline operation as indicated in Table 2-1.
Dialer Address (B7, B8)-If more than one dialer is used on the same
RS366 interface, these two switches provide a unique address for each
dialer. When only one dialer is used, the switches should be off, selecting
address O.

2-1

Interconnect
Options

Signal Ground Reference (p)-This option connects signal ground
(RS366 interface, pin 7) to chassis ground within the dialer if required
by the installation.
RS366A Interface (m, n)-This option configures the dialer for RS366A
connections. If enabled, interface pins 18 and 19 (Receive Common, Send
Common) are connected to signal ground, and pin 1 (Protective Ground)
is isolated from chassis ground within the dialer. If disabled, standard
RS366 connections are selected (Le., pin 1 is connected to chassis ground
within the dialer and pins 18 and 19 are not connected).
PC/MIC Jumper (r)-This option allows connection of PC (Programming
Common) to MIC (Mode Indicator Common) in the TelCo line interface.
This option is used in single-line dialer application where a single
conductor is provided in the modem line interface cable for PC/MIC.
Applies only to VA811S versions.

Operating
Protocol
Options

Dial Mode Select (A3, A4)-This option provides either manual or automatic selection of dial mode as follows:
• Pulse: Forces pulse dial only.
• Tone: Forces tone dial only.
• Automatic: If this position is selected, the dialer will tone dial the first
digit and monitor dial tone. If dial tone disappears within .5 second,
the dialer will tone dial the remaining digits; if dial tone is still present
after .5 second, the dialer will pulse dial the entire number instead.

,~.

Blind Dial (A2)-The VA811 incorporates a positive dial-tone detector
and normally inhibits the dial sequence until a dial tone has been detected. With this option enabled, blind dialing is initiated after CRQ (Call
Request) is ON for 5 seconds, independent of dial tone.
Line Transfer Control (B5, B6)-This option determines when the dialer
transfers control of the telephone line to the modem (single-line dialer
version only). The three possibilities are:
• End-of-Number: If this setting is selected, the dialer transfers control
to the modem immediately after the last digit is dialed. When this
setting is used, the modem is responsible for detecting carrier and
completing the line-connect protocol.
• Start-of-Answer Tone: If this option is selected, the dialer waits for
answer tone from the remote modem and transfers control 1.5 seconds
after the beginning of answer tone is detected. This setting is used for
Bell 103- and 212-type protocols, where MARK is used in lieu of a
separate answer-tone frequency.
• End-of-Answer Tone: If this setting is selected, the dialer waits for
answer tone and transfers control after answer tone is complete. (Answer tone duration must be at least 1.5 seconds.) This setting is used
for all other modems except the Bell 103 and 212.

2-2

DLO Control (A6)-DLO (Data Line Occupied), sent to the computer via
interface pin 22, indicates that the communication channel is busy. If the
local position is selected, DLO is turned ON when the dialer or the local
modem is off hook (busy). If the remote position is selected, DLO is
turned ON when the called number is busy (Le., if a busy tone is detected
by the dialer).
ACR Select (Bl, B2, B3)-ACR (Abandon Call and Retry), sent to the
computer via interface pin 3, suggests that the call attempt be aborted
and retried at a later time. This option allows user selection of the
conditions that generate ACR. Since the switches operate independently,
the dialer may be commanded to turn on ACR under any or all of the
following conditions:
• If an invalid digit is dialed
• If a busy tone is detected
• If the local modem is busy
ACR Timing (A7, A8)-To avoid inordinately long waiting periods on
calls, the VA811 incorporates a timer that turns on ACR at the end of the
selected delay period (see Table 2-1). The timer is started each time CRQ
(Call Request) is turned ON and reset each time PND (Present Next Digit)
is turned OFF.
DSC Inhibits ACR Timer (A5)-DSC 2 (Distant Station Connected), returned to the computer via interface pin 13, indicates that the dialer has
completed the call and transferred control to the modem. If this option
is enabled, the ACR timer is stopped when DSC is turned on. If disabled,
the ACR timer will continue to run (and time out) after control has been
transferred to the modem. (The latter setting is useful when the Line
Transfer Control option is set to End of Number.)
Teletype Interface (B4)-This option allows the dialer to be used for
teletype (TWX) operation. Must be disabled for switched-network (DDD)
operation.
2

This signal is also identified as DDS (Data Set Status) or COS (Call
Origination Status) in certain RS366 documents.

2-3

D
i

-------.L---~

J2[1]

82083 BO REV 0

j k

f 9

I~
M271

VA811·01

Figure 2-1. VA811 Switch and Strap Locations

Table 2-1. VA8l10ptions
Option Name
Dialer Type
Single-line Dialer (SLD)
Multiline Dialer (MACS)
Blind Dial
Enable
Disable
Dial Mode Select
Pulse
Tone
Automatic
DSC Inhibits ACR Timer
DSC Inhibits ACR
Disable
DLO Control
Local
Remote
ACR Timing
56 seconds
42 seconds
28 seconds
14 seconds

Switch/Strap Configuration
Ai OFF; j, k, 1, s, t, u IN; and f, g, h, v, w OUT
Ai ON; j , k, 1, s, t, u OUT; and f, g, h, v, W IN
A2
ON
OFF(*)
A3
OFF
OFF
ON
A5
ON(*)
OFF

A4
OFF
ON
OFF(*)

ON (SLD)
OFF (MACS)
A7

ON
ON
OFF
OFF

ON
OFF(*)
ON
OFF

2-4

Table 2-1. VA811 Options (cont'd)
/~

Option Name

Switch/Strap Configuration

ACR Select
ACR with Invalid Digit
ACR with Busy Tone
ACR with Local Modem Busy

Bl
ON

Teletype Interface
Enabled (TWX)
Disabled (DDD)

B4
ON
OFF(*)

Line-Transfer Control
End of Number
Start of Answer Tone
End of Answer Tone

Dialer Address
Address 0
Address 1
Address 2
Address 3

Mfg. Test/Internal Memory
Test
Normal Operation

a
IN
OUT(*)

RS366A Interface
Enable
Disable

ill

Signal Ground Reference
Connected to Chassis Gnd
Isolated from Chassis Gnd

p
IN
OUT(*)

PC/MIC Jumper
Connected
Isolated

r
IN
OUT(*)

Mfg. Test/Line-Current Detect
Test (LCD Bypassed)
Normal Operation

x
IN
OUT(*)

ON
OFF
OFF
OFF
OFF
ON
ON

OUT
IN

ON
-

B6
OFF
ON (103/212)
OFF (non-l03/212)
B8
OFF(*)
ON
OFF
ON

n
IN
OUT(*)

NOTES: (*)
Standard setting, all models
(SLD)
Standard setting, single-line dialer versions
(MACS) Standard setting, multiline dialer versions
Either position

2-5

B3
-(*)
-(*)
ON(*)

i~
J

,,~

Section 3
INSTALLATION
INTRODUCTION

This section provides installation procedures for the VA811 dialer. In
case of difficulty during any of the following procedures, contact the
nearest RACAL-VADIC Regional Service Center listed at the front of this
manual.
~:~:~:~:~:~:~:~:~:~:~:~:~:~:~:~:~:~:
·CAlifiON:: ~:~:~:~:~:~:~:~:~: ~:~:~:~:~:~:~:~:
....................................................

Procedures in this section should
be performed in the sequence and
manner prescribed. Any deviation may damage the equipment.
PRELIMINARY
PROCEDURES

Unpacking
And Inspection

Inspect the shipping carton immediately upon receipt. If the carton has
been damaged, request that the carrier's agent be present during unpacking. Inspect contents for physical damage and/or missing parts. If the
contents have been damaged or parts are missing, immediately notify the
nearest RACAL-VADIC sales office.

3-1

Equipment
Supplied

Table 3-1 lists the equipment supplied with the VA811.

Table 3-1. Equipment Supplied
Dialer
VA811-PS

PCB Part No.
82083-011

Cable Part No.
15036-xxx

VA811-SS

82083-011

15035-xxx

VA811-XM

82083-011

15000-093

NOTOE: Cables ending in -xxx may be ordered in the following lengths:
-001 for 24 in.
-002 for 42 in.
-003 for 12 ft.
-004 for 7 ft.
-009 for customer specified

Additional
Equipment
Required

The VA811 is intended for use with a RACAL-VADIC chassis as specified
in Table 3-2. Either an RS366 computer port or an RS232C port with a
VA831 adapter is also required for installation.

Table 3-2. Additional Equipment Required

Preinstallation
Checks

Dialer

Chassis

VA811-PSISS

VA1601U, VA1616A/B, or VA1680A/B

VA811-XM

VA1616M or VA1680M

Prior to installation, check the following:
• Verify equipment configurations shown in Figures 1-1 and 1-2 (VA811PS/SS) or Figure 1-3 (VA811-XM).
• Verify switch and strap options described in Section 2.
• Refer to Table 3-1 and verify that the proper cable has been supplied
with dialer.
.,.

.....

~ :....................................................
~ :~ :~ :~ :~ :~ :~ :~ :~:~:~:~ :~:~ :~ :~ :~ :~ :~ :~ .NO'TE ~:~ :~:~ :~ :~ :~:~:~ :~ :~ :~ :~ :~ :~ :~ :~ :~ :~ :~:~ :

Prior to connecting any device to
the switched-telephone network,
Federal Communications Commission (FCC) regulations specify
that the customer must provide
the telephone company with the
name of the manufacturer, equipment model number, FCC registration number, and ringer
equivalence number of the devices to be used. This information
is listed at the front of this manual.

3-2

VA811-PS/SS
INSTALLATION

The VA811-PSISS single-line dialer can be installed in any available slot
in the VA1601U, VA1616A/B, or VA1680A/B chassis. Install the unit as
follows:
1. Turn off power to chassis.

2. Carefully insert dialer in desired slot. Be sure printed circuit board is

properly seated in edge connector, then tighten thumbscrew on rear of
board.
3. Connect TelCo interface cable supplied with dialer to connector la-

beled TELCO (J2) on rear panel of dialer (see Figure 3-1) and connect
other end of cable to TelCo jack. (See Section 5 for a description of
standard TelCo jacks.)
4. Connect TelCo interface cable from associated modem to dialer connector labeled MODEM (J4).

5. COllnect RS366 interface cable (user-supplied) from computer port (or
VA831B adapter) to 25-pin female connector (J5) on rear panel of dialer.
(If VA831 adapter is used, refer to installation procedures in related
manual.)
6. Turn on power and perform checkout procedures in Section 4.

SUPPLIED
WITH DIALER

VA8ll
DIALER
~--

......-........---~ TO TELCO LINE

'5 . . . ----+-

TO VA1601U, VA16l6AX/BX
OR
VA1680AX/BX CHASSIS

~TO

RS366 PORT
(OR VA83l)

USER-SUPPLIED

......----+---\-~~

T O RS232 PORT

MODEM
~--

SUPPLIED
WITH MODEM
VASll-0S

Figure 3-1. VA811-PS/SS (SLD) Connections

3-3

VA811-XM
INSTALLATION

The VA811-XM multiline (MACS) dialer must be installed in slot 16 of
the VA1616/80M chassis for proper operation. (The optional VA831A
adapter, if used in the same chassis, goes in slot 15.) Install the dialer as
follows:
1. Turn off power to chassis.
2. Carefully insert dialer in slot 16. Be sure printed circuit board is
properly seated in edge connector, then tighten thumbscrew on rear of
unit.
3. Connect RS366 interface cable (user-supplied) from computer port (or
VA831A adapter) to 25-pin female connector (J5) on rear panel of dialer
(see Figure 3-2). If the VA831 adapter is used, refer to installation
procedures in related manual for cable connections to that unit.
4. Turn on power and perform checkout procedures in Section 4.

VA811
DIALER
~---

'4
'2
P3

TO VA1616AM/BM
OR
VA1680AM/BM
CHASSIS

.J - - - - - ........

DAISY CHAIN
-~TO NEXT DIALER
.. TO RS366 PORT
(OR VA831)

USER-SUPPLIED

.......---~---~TO

RS232 PORT

MODEM
~----~TO

(1-15)

TELCO LINE

SUPPLIED
WITH MODEM
VA811·06

Figure 3-2. VA811-XM (MACS) Connections

3-4

Section 4
CHECKOUT AND OPERATION
INTRODUCTION

This section introduces the character set used by the VA8ll, describes
the controls and indicators available on the associated chassis, and presents operational checkout procedures for the dialer. A basic knowledge
of RS366 interface operation is assumed. Readers unfamiliar with this
interface are encouraged to read Section 5 before proceeding.

4-1

CHARACTER
SET

The VA811 accepts decimal-weighted binary digits from the four number
bit lines (NB1-NB8) of the RS366 interface and generates either the pulse
sequence or the tone pairs specified by each digit received. The dialer
recognizes digits 0.....9 as valid dial digits in all modes and digits 10(*)
and 11(#) in tone dial mode (see Table 4-1). Digit 12 is recognized as an
End-of-Number (EON) code and causes the dialer to immediately transfer
control to the associated modem. Digits 13 and 14 are recognized as a
Tandem Dial code that causes the dialer to wait for .5 second, then look
for a second dial tone.
Table 4-1. Telephone Digits
Number Bit
842 1

Dial Digit
Hex
Decimal

o0
o0

0 0

0 1

1 0

001 1
o1 0 0

3
4

o1
o1
o1

0 1

1 0

1 1

1 000

1 001

1 0 1 0

101 1

1 100

1 101

1 1 1 0

1 111

C
D
E
F

4-2

Function
Telephone digit
Telephone digit
Telephone digit
Telephone digit
Telephone digit
Telephone digit
Telephone digit
Telephone digit
Telephone digit
Telephone digit
Telephone digit
Telephone digit
End-of-Number Code
Tandem Dial Code
Tandem Dial Code
Not assigned

0
1
2
3
4

5
6
7

8
9

When used in a MACS environment, the first two digits received by the
VA811 are interpreted as dialer address/modem type and modem address
digits. The first digit received (Address Digit #1) specifies dialer address
o through 3 on NBl and NB2, and either a 103-type or a non-103-type
modem on NB4 (see Table 4-2). If only one dialer is used in a system, the
dialer address should be set to O.
Table 4-2. Dialer Address/Modem Type
Number Bit
842 1
o0 0 0
000 1
o0 1 0
001 1
o1 0 0
o1 0 1
o1 1 0
o1 1 1

Dial Digit
Hex
Decimal
0
0
1
1
2
2
3
3
4
4
5

Function
Dialer Address 0
Dialer Address 1
Dialer Address 2
Dialer Address 3
Dialer Address 0
Dialer Address 1
Dialer Address 2
Dialer Address 3

non-103
non-103
non-103
non-l03
103/212
103/212
103/212
103/212

The second digit received (Address Digit #2) specifies the slot address
(see Table 4-3) of the MACS modem that the call is to be placed through.

Table 4-3. Modem (Slot) Address
Number Bit
842 1
o0 0 0
000 1
001 0
001 1
o1 0 0
o1 0 1
o1 1 0
o1 1 1
1 000
100 1
1 0 1 0
101 1
1 100
1 101
1 1 1 0
1 1 1 1

Dial Digit
Decimal
Hex
0
0
1
1
2
2
3
3
4
4

4-3

10
11
12
13
14
15

A
B
C

D
E

Function
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address
Slot Address

0
1
2
3
4
5
6
7

8
9

10
11
12
13
14
15

EXAMPLE
CALLS

The following hexidecimal digit strings represent calls to (408) 744-0810
under various conditions.
• Single-line dialer:
4087440810
4087440810C
9D4087440810
• MACS dialer:
474087440810
474087440810C
479D4087440810C

CONTROLS AND
INDICATORS

Immediate transfer to modem (EON code)
Tandem dial through local (9-level) exchange
Dialer address 0, 103-type modem, modem
address 7
Same as above with immediate transfer to
modem (EON code)
Same as above with tandem dial through local
(9-level) exchange

The VA811 interfaces to the chassis display and control bus through cardedge connector Pl. When the dialer card slot is addressed from the front
panel, the chassis diagnostic indicators display the significant interface
signals used by the dialer. Figure 4-1 shows the diagnostic indicators
used on RACAL-VADIC chassis. The upper legend in the figure shows
the standard indicator functions as labeled on the front panel; the lower
legend identifies the indicator functions displayed when the adapter is
selected'. Table 4-4 identifies the function of each control and indicator.

4-4

••••••••
TXD RXD RTS

CTS

DSR

DTR

CXR

CRQ

PND

DPR

DSC

ACR

DLO
\'1\811-07

Figure 4-1. Diagnostic Display Indicators

Table 4-4. Controls and Indicators

TXD

Function (with VA8ll selected)
Not used

RXD

Not used

RTS

CRQ (Call Request)

CTS

PND (Present Next Digit)

DSR

DPR (Digit Present)

DTR

DSC (Distant Station Connected)

ACR (Abandon Call1Retry)

CXR

DLO (Data Line Occupied)

PWR

Power Supply Status

CHANNEL *
STATUS
Switch
CHANNEL
SELECT

Channel Status

ALB (Local Test)

Forces DLO (takes dialer off hook and
busies out attached phone line)

DLB (Remote Test)

Forces slow dial test mode

TXR (Transmit Reversals)

Forces CRQ in test mode

Indicator

Selects card slot

* Flashes in test mode or if DPR remains off for more than 1.5 seconds
after CRQ turns on; ON during dial sequence; OFF when CRQ is off
and no test mode selected.

4-5

OPERATIONAL
CHECKOUT

The following procedures verify the operational integrity of the VA811.
The first set of procedures applies to single-line dialer (VA811-PS/SS)
installations, the second set to MACS (VA811-XM) installations.

VA811-PS/SS

To check operation of the VA811 in a single-line environment, perform
the following steps:
1. Select dialer (slot) address with CHANNEL SELECT switch on front of
chassis.
2. Set ALB/OFF switch to ALB and verify that DLO(CXR) indicator illu-

minates. (This takes the dialer off hook and busies out the telephone
line attached to the dialer.) Return ALB/OFF switch to OFF.
3. Set TXR/OFF switch to TXR and verify that CRQ(RTS) and DLO(CXR)

indicators illuminate. Verify that PND(CTS) indicator illuminates after
a brief delay, indicating that dial tone detector is operating properly.
Return TXR/OFF switch to OFF.
4. Set TXR/OFF to TXR once again and monitor delay interval between

CRQ(RTS) turn-on and ACR(RI) turn-on. Verify that delay corresponds
to ACR timing selected in Table 2-1. Return TXR/OFF switch to OFF.
5. Set DLB/OFF switch to DLB. Initiate call from computer and verify the

following sequence with chassis display indicators:
a. CRQ(RTS) turns ON (call request from computer).
b. PND(CTS) turns ON (dial tone detected).
c. DPR(DSR) turns ON (digit present from computer).
d. PND(CTS) turns OFF after being on for 1 second.
e. DPR(DSR) turns OFF also.
f. PND(CTS) remains OFF for 1 second, then turns ON.
g. Steps c, d, e, and f repeat until all digits have been dialed.
6. Set DLB/OFF switch to OFF to terminate test.

4-6

VA811-XM

To check operation of the VA811 in a multiline (MACS) installation,
perform the following steps:
1. Select dialer (slot) address with CHANNEL SELECT switch on front of
chassis.
2. Set TXR/OFF switch to TXR and verify that CRQ(RTS) and PND(CTS)
indicators illuminate. Return TXR/OFF switch to OFF.
3. Set TXR/OFF to TXR once again and monitor delay interval between

CRQ(RTS) turn-on and ACR(RI) turn-on. Verify that delay corresponds
to ACR timing selected in Table 2-1. Return TXR/OFF switch to OFF.
4. Set ALB/OFF switch to ALB. Send dialer address/modem type and

modem address digits to dialer and verify that DLO indicator illuminates. (If only one dialer is used in the system and a MACS modem is
installed in the first card slot, the address digits can be 0,0.) If this test
fails, verify that dialer address/modem type digit corresponds to the
Dialer Address selected in Table 2-1.
5. Set DLB/OFF switch to DLB. Initiate a call from the computer and
verify the following sequence of events with the chassis display
indicators.

/~.

a. CRQ(RTS) turns ON (call request from computer).
b. PND(CTS) turns ON (dial tone detected).
c. DPR(DSR) turns ON (digit present from computer).
d. PND(CTS) turns OFF after being on for 1 second.
e. DPR (DSR) turns OFF also.
£. PND(CTS) remains OFF for 1 second, then turns ON.
g. Steps c, d, e, and f repeat until all digits have been dialed.
6. Set DLB/OFF switch to OFF to terminate test.

4-7

,~.

Section 5
SUPPLEMENTAL INFORMATION
INTRODUCTION

This section describes the hardware interfaces used by the VA8ll and
briefly discusses the operational characteristics of the dialer in both a
single-line and multiline environment. Except where noted, the following information applies to both the VA8li-PS/SS (single-line) and VA8iiXM (multiline) dialer.

EQUIPMENT
INTERFACES

The VA8ll contains four connectors (J2, J4, J5, and P3) mounted on the
rear panel of the unit and a card-edge connector (Pi) at the opposite end
of the printed circuit board (PCB). These connectors are used as follows:
J2-This 8-position miniature connector (labeled TELCO) provides direct connection to the TelCo line in single-line dialer (VA8ii-PS/SS)
installations. The line interface cable supplied with the VA8il-PS/SS
connects between the TelCo-supplied jack and this connector. Not
used for multiline (MACS) operation.

J4- This

8-position miniature connector (labeled MODEM) provides a
loop-through connection to the TelCo line for the associated modem
in single-line dialer installations. The line interface cable supplied
with the modem connects to this jack. Not used for multiline (MACS)
operation.

J5-This 25-pin female connector provides an RS366 interface to the
. computer equipment (or VA831 adapter, if used) in both single-line
and multiline installations. When the VA83i is not used, the usersupplied cable from an RS366 port connects to this jack. When the
VA831 is used, the RS366 cable from P3 on the adapter connects to
this jack (see VA83i installation/operation manual).
P3-This 25-pin male connector provides buffered RS366 expansion
capability (daisy-chain) for multiline dialer installations using two,
three, or four dialers on the same RS366 interface. Where applicable,
the expansion cable provided with the VA8ii-XM connects between
this jack and J5 on the next dialer. Not used for single-line operation.
Pi-This 36-pin (dual-sided 18-pin) edge connector provides an interface
to the display and control bus used in RACAL-VADIC chassis.

5-1

LINE INTERFACE
Introduction

When ordered for single-line operation, the VA8ll is supplied with a
telephone interface cable terminated at both ends with miniature telephone connectors. One end of the cable connects to J2 on the dialer and
the other end of the cable mates with standard jacks supplied by the
telephone company. The cable establishes a permissive (VA8ll-PS) or a
programmable (VA8ll-SS) direct connection to the switched-telephone
network, as defined by Part 68 of the FCC Rules and Regulations.
The VA8ll-PS, supplied with a cable terminated in a 6-position miniature connector, is registered for permissive direct connection. This version of the dialer may be connected to a standard RJllC voice jack (the
type normally used by the telephone company for standard home or
office phones). Optionally, the VA811-PS may be connected to either an
RJ41S or RJ45S data jack.
The VA8ll-SS, supplied with a cable terminated in a 8-position miniature connector, is registered only for programmable direct connection.
This version of the dialer requires an RJ41S or RJ45S data jack.
Tables 5-1 and 5-2 list pin assignments for the RJllC, RJ41S, and RJ45S
telephone jacks, and Table 5-3 defines the standard mnemonics used on
the telephone interface.

Table 5-1. RJllC Connector Pin Assignments

Function
Not used

Mode Indicator

Ring

Tip

MIC

Mnemonic

Pin
1
2

Mode Indicator Common
Not used

.~.

5-2

Table 5-2. RJ41S,45S Connector Pin Assignments
Mnemonic

Function

Mode Indicator

Ring

Tip

MIC

Programming Resistor

Programming Resistor Common

Mode Indicator Common

* Pins 1 and 2 are Ring and Tip for Fixed-Loss Loop (FLL) connections
and are not used by RACAL-VADIC devices.

Table 5-3. TelCo Interface Signal Definitions
Mnemonic
R

Signal Name
Ring

Tip

Mode Indicator

Programming
Resistor

MIC/PC

MI/PR Common

5-3

Function
Connection to one side of telephone line.
Connection to other side of
telephone line.
At the end of the dial sequence,
MI is momentarily shorted to
MIC within the dialer to take
the associated modem off hook
(see Line Transfer Control option in Section 2).
Connection to resistor in TelCo
data jack (through the dialer)
that sets modem gain for programmable connection.
Common return for Mode Indicator and Programming Resistor signals.

RS366 INTERFACE
Introduction

The primary RS366 interface signals shown in Figure 5-1 are described
on the following pages. Table 5-4, following the signal descriptions, lists
pin assignments for interface connector J5.
RS366 PORT

VA811
J5
I--i--o

PWI

OLO

CRQ

22
4

PNO

NB1
~

NB2
~

NB4
NB8
OPR

14
15
16
17
2

OSC

ACR

+12V TEST

-12V TEST

.::

VA811·08

Figure 5-1. RS366 Interface Signals

RS366 Signal
Descriptions

Refer to Figure 5-1 while reading the following signal descriptions:
PWI (Power Indication)-Signal from dialer to computer indicating
power status of the dialer. The ON condition indicates that power is
present in the dialer. The OFF condition, indicating that the dialer is
inoperative, represents an impedance to signal ground greater than 300
ohms.
DLO (Data Line Occupied)-Signal from dialer to computer indicating
that communication channel is busy. The conditions that assert DLO are
selected by DLO Control option, Section 2.
CRQ (Call Request)-Signal from computer to dialer that initiates dial
sequence. After CRQ comes ON, the dialer waits 1.5 seconds before going
off hook to separate successive calls long enough for exchange clear
down. CRQ must remain ON during the entire call origination period
(Le., until DSC comes ON) in order to hold the dialer off hook. CRQ must
be turned OFF between calls or call attempts and must not be turned ON
unless DLO is OFF.
5-4

PND (Present Next Digit)-Signal from dialer to computer requesting a
new digit. PND is initially turned ON after the dial tone signal has been
detected and remains ON until DPR (from the computer) is turned ON.
When DPR is turned ON, the dialer reads and dials the digit presented
on NB1-NB8, then turns PND OFF. PND does not come ON again until
DPR has been turned OFF. This sequence is repeated until all digits have
been dialed, then PND will come ON and remain ON.
NB1-NB8 (Number Bits)-ParalleI4-bit binary signal (active LOW) from
the computer to the dialer representing the digit to be dialed. (Also used
to send Tandem Dial and End-of-Number codes and MACS addresses,
as described in Section 4.) These lines must be held stable while
DPRis ON.
DPR (Digit Present)-Signal from computer to dialer indicating that
information on number leads (NB1-NB8) is valid. PND (from dialer)
must be ON before DPR is turned ON, and PND must be OFF before DPR
is turned OFF. After the dialer has accepted the last digit of the called
number (including EON when used) and has turned PND OFF, DPR must
be turned OFF and held in the OFF condition even though PND may
come ON again.
DSC (Distant Station Connected)-Signal from dialer to computer indicating that the dialer has completed the call and line control has been
transferred to modem. At this point, the computer may release CRQ
without 'causing a disconnect.
ACR (Abandon Call and Retry)-Signal from dialer to computer suggesting that the call be aborted and retried later. The conditions that turn ACR
ON are user-selectable options and are described in Section 2.
SG (Signal Ground)-Common ground reference point for all interface
circuits. May be connected to chassis ground by user options (see
Section 2).
FG (Chassis [Protective] Ground)-Common return to ac power ground.

+ 12 V and - 12 V (Test)-These signals provide test points to verify the
presence of power in the modem. This is supplied through 1.5 kohm
resistors and is not intended as a source of power for peripheral
equipment.

5-5

Table 5-4. RS366 Interface Connector (J5)

Mnemonic

1
2
3
4
5
6
7
B
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23-25

FG
DPR
ACR
CRQ
PND
PWI
SG
-

+V
-V
-

DSS
NBl
NB2
NB4
NBB
RC**
SC**
-

DLO
-

Function
Frame Ground
Digit Present
Abandon Call and Retry
Call Request
Present Next Digit
Power Indication
Signal Common
Not used
+ 12 V Test
-12 V Test
Not used
Not used
Data Set Status
Number Bit 1
Number Bit 2
Number Bit 4
Number Bit 8
Receive Common
Send Common
Not used
Not used
Data Line Occupied
Not connected

* PL = Positive TRUE logic
NL = Negative TRUE logic
- = Either state
)(.* = RS366A option enabled (see Section 2)

5-6

Signal
Type*
-

PL
PL
PL
PL
PL
-

PL
NL
NL
NL
NL
-

PL
-

RS366
Protocol

Basic single-line dialer operating protocol for the RS366 interface is
summarized in Table 5-5. As indicated in the table, a call is initiated from
the computer by asserting CRQ on the RS366 interface. (It is advisable to
test PWI and DLO before asserting CRQ.) When CRQ is turned ON, the
dialer starts the ACR timer, waits 1.5 seconds (to ensure TelCo exchange
has cleared down between calls), then goes off hook and waits for dial
tone. When dial tone is detected, the dialer asserts PND to the computer.
(DLO will also be turned on if the local DLO option is selected-see
Section 2.) At this point, the computer sets the first dial digit on
NB1-NB8, then asserts DPR. When the dialer senses DPR ON, it reads
NB1-NB8, dials the digit specified, then turns PND OFF. (If pulse dial
mode has been selected, the dialer inserts a 750 ms interdigit delay before
turning PND OFF.) At this point, the ACR timer is reset within the dialer
and DPR is turned OFF by the computer. When the dialer senses DPR
OFF, it asserts PND once again, requesting a new digit. This handshaking
cycle repeats until all digits have been transferred to the dialer. When
the last digit has been dialed, the dialer transfers line control to the
modem and asserts DSC. (See Section 2 for line-transfer options.) With
the modem now connected to line, the computer turns CRQ OFF, releasing the dialer, and the dialer turns PND OFF.

Table 5-5. RS366 Interface Dial Sequence
Event No.
1

RS366 Port
Turn CRQON

Wait 1.5 seconds
Detect dial tone
TurnPNDON

Set dial digit
Turn DPRON
Read digit and dial
If pulse dial, wait
interdigit delay
TurnPND OFF

5
6

VA811 Dialer

Notes
ACR timer starts
Clear-down delay
DLO ON (user option)
NB1-NB8

ACR timer recycles

Turn DPR OFF
TurnPND ON
REPEAT 3 THROUGH 6 UNTIL
ALL DIGITS HAVE BEEN DIALED
Detect Answer Tone
Transfer control
to modem
TurnDSC ON
TurnCRQOFF
TurnPND OFF

5-7

Line-transfer control
set by user option
(see Section 2)

Multiline (MACS) operating protocol is identical to the single-line protocol described previously except that the qialer and modem must be
addressed before starting the dial sequence. As indicated in Table 5-6,
the computer initiates a call in the same fashion, but the dialer asserts
PND immediately, requesting a dial~r address/modem-type digit. (Telephone and address digits are defin~d in Section 4.) At this point, the
computer sets address digit #1 on the interface and asserts DPR. The
dialer reads and compares the address with that selected (see Dialer
Address option, Section 2), and turns PND OFF if the digit is recognized.
When the computer turns DPR OFF, the dialer asserts PND once again,
requesting a modem address. The computer places the desired modem
address on the interface and sets DPR. The dialer reads the address,
selects the specified modem via the MACS chassis bus, and turns PND
OFF. The computer turns DPR OFF, and the dialer, after" waiting the 1.5second clear-down delay, connects to the telephone line via the modem
line interface and looks for dial tone. From this point the sequence of
events is identical to the single-line dialer protocol described previously.

Table 5-6. RS366 Interface Address Sequence (MACS only)
RS366 Port

Event No.

TurnCRQON

NB1-NBB
Read, Compare with
Dialer Address
TurnPND OFF

User-selected
(see Section 2)
ACR timer recycles

Turn DPR OFF
TurnPND ON
NB1-NBB

Set Address 2
Turn DPR ON
Read, select modem
via chassis bus
TurnPND OFF

ACR timer starts

Set Address 1
TurnDPRON

5
6
7

Notes

TurnPNDON

VA8ll Dialer

ACR timer recycles

Turn DPROFF
See Table 5-5, Events 2-9

CHASSIS
INTERFACE

As mentioned previously, the dialer interfaces to the standard controls
and indicators used on RACAL-VADIC chassis through the 36-pin cardedge connector (Pi) located at one end of the PC board. When configured
for MACS operation, the' dialer also uses this chassis interface to communicate with MACS modems. Pin assignments for the edge connector
are listed in Table 5-7. Further information on these signals can be found
in the associated chassis manual.
5-8

Table 5-7. Edge Connector Pin Assignments (Pt)
Pin

Mnemonic

A
1
B
2
C
3
D
4

FDLO
SI

5
F
6
H
7

J
8
K
9

L
10
M
11
N
12
p
13
R
14
S
15
T
16
U
17
V
18

DCRQ
DPND
DDPR
DDSC
DACR
DDLO
SLDL
FCRQ
FSH
DOH
DDA
XFER
MDR
MDT
-

A8
A4
A2
A1
STRB
C8
C4
C2
Cl
-

* PL = Positive TRUE logic
NL = Negative TRUE logic

Function
Force Data Line Occupied (ALB switch)
Status Display
Not used
Not used
Display Call Request
Display Present Next Digit
Display Digit Present
Display Distant Station Connected
Display Abandon Call and Retry
Display Data Line Occupied
Slow Dial (DLB switch)
Force Call Request (TXR switch)
Flash Input (2 Hz)
Dialer Off Hook
Dialer Data Access
Dialer Transfer
Modem Data Ring (to modem)
Modem Data Tip (to modem)
Not used
Address Bit 8
Address Bit 4
Address Bit 2
Address Bit 1
Dialer Strobe
Compare Bit 8
Compare Bit 4
Compare Bit 2
Compare Bit 1
Signal Common
Signal Common
+5 V Power
+5 V Power
+12 V Power
+12 V Power
-12 V Power
-12 V Power
A

- =
5-9

Analog signal
Don't care

Signal
Type*
NL
NL
-

NL
NL
NL
NL
NL
NL
NL
NL
NL
PL
PL
PL
A
A
-

NL
NL
NL
NL
NL
PL
PL
PL
PL
-

'~;)

SPECIFICATIONS
OPERATING
CHARACTERISTICS

Operating Modes

Tone dial, pulse dial, or automatic dial mode selection

Pulse Dial Mode

Pulse Rate:
Duty Cycle:
Interdigit Delay:

10 pulses per second ± 10 0/ 0
61 0/ 0 ± 30/ 0 (percent break)
750 ± 50 ms

Tone Dial Mode

Tone Duration:
Intertone Delay:
Transmit Level:

70 ± 5 ms
70 ± 5 ms
-1.5 ± 2.5 dBm of continuous tone pair power
(less than 0 dBm averaged over a 3-second interval
during normal dialing)

Frequencies:

BCD Digit
0001
1
0010
2
0011
3
0100
4
0101
5
0110
6
0111
7
1000
8
1001
9
0000
a
1010
*
1011
#

Tone Pairs
697 1209 Hz
697 1336 Hz
697 1477 Hz
770 1209 Hz
770 1336 Hz
770 1477 Hz
852 1209 Hz
852 1336 Hz
852 1477 Hz
941 1336 Hz
941 1209 Hz
941 1477 Hz

Dial Tone Detection
(DDD & TWX)

Frequency:
Stopband:
ON Delay:
Threshold:

350 to 600 Hz
1950 to 2300 Hz, up to -10 dBm
0.5 ± .2 second
ON @ -32 dBm; OFF @ -38 dBm

Busy Tone Detection

Frequency:

DDD-350 to 600 Hz
TWX-1990 to 2260 Hz
DDD-Greater than 20 IPM
TWX-Greater than 20 IPM
1.5 seconds ± .1 second for 60 IPM or greater
4 seconds for less than 60 IPM
DDD-ON @ - 32 dBm; OFF @ - 38 dBm
TWX-ON @ - 45 dBm; OFF @ - 52 dBm

Rate:
ON Delay:
Threshold:
Answer Tone
Detection

Frequency:
ON Delay:
Threshold:

1990 Hz to 2260 Hz
1.5 seconds ± .1 second
ON @ -45 dBm; OFF @ -52 dBm

5-11

LINE-CONTROL
FUNCTIONS
Transfer Control
Tandem Dialing
Blind Dialing
End of Number Code
Modem Busy Indication

Start or end of answer tone or end of number, switch selectable
Digit 1101 or 1110 (SEP character) resets dial tone detector; denotes
"Delay .5 second then looks for new dial tone"
Raises PND 5 seconds after CRQ, switch selectable
Binary 1100 causes immediate line transfer to modem
DLO and/or ACR, local or remote busy, switch selectable

Data Line Occupied

ON with CRQ, or when local modem is busy, or with remote busy,
switch selectable

Line-Current Status
Indicator

ACU issues DLO and/or ACR, depending upon OptiOIl selected

Abandon Call and
Retry

Clamp OFF:
Force ON:
Delay:
Start:
Restart:

Double Ring Back

With distant station connected (DSC)
With invalid digit, busy signal detect, modem busy,
or ACR time out
14, 28,42, 56 seconds
With call request (CRQ)
With present next digit (PND) going OFF

Compatible with CCITT V.25 ring-back signal

INTERFACES
To Computer
(DTE Interface)

Per EIA RS366 (RS366A user option)

To TelCo
(Line Interface)

VA811-P,S:
VA811-SS:

permissive direct-connect per FCC Rules, Part 68
programmable direct-connect per FCC Rules, Part 68

Maximum rating

+ 12 Vdc @ 125 rnA
-12 Vdc @ 125 rnA
+5 Vdc @ 270 rnA

Operating:
Nonoperating:

0° to 60° C
- 20° to 70° C

POWER
REQUIREMENTS

ENVIRONMENTAL
REQUIREMENTS
Temperature
Humidity

Up to 90% relative humidity, without condensation

5-12

(

PHYSICAL
CHARACTERISTICS

Height

0.50 in. (1.3 em)

Width

6.4 in. (16.3 em)

Depth

12.75 in. (32.4 em) .

Weight

0.875 lb. (1.925 kg)

5-13

:~.

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_
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18008-049

WARRANTY, LIMITATION OF LIABILITY AND SERVICE INFORMATION
RACAL-VADIC warrants that its products will perform in accordance with RACALVADIC's published spncifications (or the specification agreed to. in writing. by Buyer
and RACAL-VADIC. and made a part of the sales contract), for a period of 12 months
from date of original shipment.
During this \\'arranty period RACAL-VADIC will, at no cost. promptly repair or replace
any defective equipment returned to RACAL-VADIC. transportation charges prepaid by
Buyer. and will return such equipment. transportation charges prepaid via the same or
like method as received. except where special handling or shipment is requested by Buyer.
in which case Buyer shall pay all such charges.
This warranty shall not apply to damage resulting from abuse. negligence. accident or
loss or damage in transit. The warranty shall be voided should the Buyer attempt any
repairs or alterations without prior written permission of RACAL-VADIC.
RACAL-VADIC makes no other warranty, expressed or implied. and RACAL-VADIC
DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE.
THE BUYER AND RACAL-VADIC AGREE THAT THE SOLE AND EXCLUSIVE
REMEDIES FOR BREACH OF ANY WARRANTY CONCERNING THE GOODS SHALL
BE REPAIR OR REPLACEMENT OF DEFECTIVE PARTS UPON THE TERMS ABOVE
DESCRIBED OR. AT RACAL-VADIC'S OPTION, REFUND OF THE PURCHASE PRICE.
RACAL-VADIC SHALL NOT BE LIABLE FOR CONTINGENT OR CONSEQUENTIAL
DAMAGES TO PERSONS OR PROPERTY AND ITS SOLE LIABILITY IS AS ABOVE
SET FORTH.
Any action by Buyer for any alleged breach of the warranty set forth herein shall be brought
to the attention of RACAL-VADIC by Buyer within the warranty period, but not later
than 30 days after the alleged Breach.
THIS STATEMENT OF WARRANTY AND LIMITATION OF LIABILITY IS A COMPLETE AND EXCLUSIVE STATEMENT OF ALL WARRANTY AND LIABILITY
REPRESENTATIONS OF RACAL-VADIC. It may not be varied. supplemented, qualified
or interpreted by any prior dealings between the parties or by any usage of the trade or
upon the face or reverse of any form to which this is attached or a part of, nor may it
be modified by any agenl. employee or representative of RACAL-VADIC unless such
modification or representation is made in writing and signed by a duly authorized officer of RACAL-VADIC.
Repairs and/or replacement under the terms of this warranty SHALL NOT EXTEND THE
WARRANTY LIFE OF THE ORIGINAL EQUIPMENT SUPPLIED.
Equipment returned lo the factory should be accompanied by the following information:
the reason for return. with a comprehensive description of the malfunction; shipping
instructions: and the name and telephone number of a contact in the event of problems.
Further inquiries may be directed to RACAL-VADIC's Diagnostic Center at (800) 22-VADIC
or (800) 228-2342.

Racal-Vadic
222 Caspian Drive, Sunnyvale, California 94089-9874

Printed in USA

Telephone (408) 744-0810

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