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PUB 40000

Bell System

TECHNICAL
REFERENCE

Catalog
December 1975

TABLE OF CONTENTS

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

ORDERING OF TECHNICAL REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

ADMINISTRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . .

3

DATA COMMUNICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Facilities for Data Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Data Sets, Data Auxiliary Sets and Data Service Units . . . . . . . . . . . . . . . . . . . . . . . .

5

Data Communications Systems and Terminals

....... .......................

9

Data Interconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

VOICE COMMUNICATIONS . . . . . . . . . .. .. . .. . .. .. .. .. .. . .. . .. . . .. .. .. .. .. . . . 12
Protective Connecting Arrangements -

Manual, Terminal . . . . . . . . . . . . . . . . . . .

12

Protective Connecting Arrangements -

Automatic, Terminal.................

14

Protective Connecting Arrangements -

Manual, System ................... _..

16

Protective Connecting Arrangements -

Automatic, System......... . . . . . . . . .

17

Protective Connecting Arrangements -

Private Line . . . . . . . . . . . . . . . . . . . . . . . .

19

Protective Connecting Arrangements -

Miscellaneous. . . . . . . . . . . . . . . . . . . . . . .

20

Protective Connecting Arrangements -

PBX Adjuncts. . . . . . . . . . . . . . . . . . . . . . .

21

RADIO AND TRANSMISSION ENGINEERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
AlTESTATION PROGRAMS . . . . . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . 23
CONFORMANCE PROGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

BELL SYSTEM TECHNICAL REFERENCES

Each Protective Connecting Arrangement is
further defined by a Uniform Service Order Code
(USOC), e.g., QKT, which should be used for ordering purposes when the customer desires the
installation of a connecting arrangement.

GENERAL
Bell System Technical References provide interface information to designers and manufacturers
of business machines, communications systems
and terminal equipment. The subjects covered by
these Technical References include data set inter.face specifications, data communications
systems and terminals, data connecting arrangements, protective connecting arrangements,
various transmission channels and services,
PICTUREPHONE®service, Attestation Programs
and Conformance Programs. At the present time,
these Technical References fall into six basic
categories: Data Communications, Voice Communications, Radio and Transmission Engineering, PICTUREPHONE®service, Attestation
Programs and Conformance Programs. As additional needs are determined, new Technical
References within these categories and new
categories will be provided.

It is the responsibility of the manufacturer to advise the customer of the proper USOC; and it is
the customer's responsibility to order the proper
USOC from the Telephone Company.

ORDERING OF TECHNICAL REFERENCES
One-Time Orders
All orders should indicate the Technical
Reference(s) desired by catalog number and
quantity using the following format:
(Quantity) Technical References (Catalog
Number)
If all Technical References in either the Data
Communications or Voice Communications
categories are desired, they may be ordered as a
set using the catalog number assigned to that
particular category. For example:

Technical References are prepared in two forms,
Standard and Preliminary. Standard Technical
References (e.g., Data Sets 201 A and 201 B August 1969) are provided for equipment and
services which are expected to remain
unchanged and avai Iable for a relatively long
period of time. Preliminary Technical References
(e.g., AD1 -Preliminary-October 1974) are
provided for new equipment and services and indicate information which may be changed or
revised in a relatively short time. This does not
mean that a manufacturer should not build equipment that is compatible with the information listed
but it does offer a caution that the information
presented may change.

(Quantity)

Standing Orders
In addition to one-time orders it is also possible
to place a standing order for al I new and revised
Technical References in a given category (i.e.,
Transmission Engineering PICTUREPHONE service or Attestation Programs). To place a standing order, use the following words:

This catalog of Technical References, to be
published as required, lists all current Bell
System Technical References. Included for each
Technical Reference is the title, a synopsis and
an ordering number (PUB4XXXX). In addition, a
listing is provided to permit ordering of complete
sets of Technical References in either the Data
Communications or Voice Communications
categories. Companies on standing order distribution will automatically receive a copy of the
catalog.

®

Complete Set of Voice
Communications Technical
References - PUB42000

Standing order for (Quantity) copies of all
new [Category, (e.g., Voice, Data or
Transmission)] Technical References.

Bell System Companies
Bell System Organizations may order Technical
References using Form SD-1 .80.80 and address
it to:
Western Electric Company, Incorporated
Indiana Publication Center
P. 0. Box 26205
Indianapolis, Indiana 46226

Registered Service Mark of AT&T Co.
1

All requests should include both billing and shipping addresses. Billing will be rendered by the
Western Electric Company, therefore, all checks
should be made payable to them.

Non-Bell Companies
Non-Bell Companies should submit written requests for Technical References to:
American Telephone and Telegraph Co.
Supervisor - Information Distribution Center
195 Broadway, Room 208
New York, New York 10007

Pricing Information
The current Commercial Price for Technical References is $1.50 each except the following:

PUB40001 (Binder)
PUB41004
PUB41005
PUB41006
PUB41007
PUB41008
PUB41009
PUB41204
PUB41212
PUB41213
PUB41403
PUB41405
PUB41702
PUB41704
PUB41705
PUB41706
PUB41707
PUB41708
PUB41709
PUB41712
PUB42103
PUB42201
PUB42210
PUB43101
PUB43201
PUB43301
PUB43401
PUB44101

$4.35
2.10
1.55
1.65
3.05
1.75
1.65
1.65
1.60
1.95
2.10
1.70
1.95
1.70
1.75
1.70
1.65
1.80
1.65
1.80
1.70
1.70
1.80
2.80
2.05
1.70
1.90
3.90

ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.
ea.

There is no charge for addenda. Prices subject to change without notice. The price of a complete set or a
PUB series (i.e., PUB 41000) is determined by the prices of individual references. Prices do not include
taxes or premium mailing charges.

2

ADMINISTRATION
*PUB40000

Technical Reference CatalogDecember 197 5

Lists all current Bell System Technical
References and provides ordering information,
catalog numbers and synopsis.

PUB40001

Technical Reference Binder

A general purpose four-ring binder suitable for all
categories of Bell System Technical References.
This binder will hold approximately 15 individual
Technical References.

DATA COMMUNICATIONS
PUB41000 Complete Set of Data Communications Technical References

Facilities for Data Communications
PUB41001

30-Baud Private Line Channels
Interface Specification December 1967

Describes a private line channel capable of
transmitting two-state ("mark-space," "binary")
signals at rates up to 30-baud for metering,
supervisory control and miscellaneous signaling
purposes. Metal lie continuity, end-to-end, is not a
requirement of this channel and will generally not
be available. The interface signal is two-state
direct current.

PUB41002

45- 55- & 75-Baud Private Line
Channels Interface
Specification December 1967

Describes three private line channels capable of
transmitting two-state ("mark-space," "binary")
signals up to their respective rated speeds for
teletypewriter, data, metering, supervisory control and miscellaneous signaling purposes.
Metallic continuity, end-to-end, is not a requirement of this channel and wi II generally not be
available. The interface signal is two-state direct
current.

PUB41003

1 50-Baud Private Line Channels
Interface Specification Revised September 1 97 5

Defines the interface for the 1 50 Baud Private
Line Channel as presented to Customer-Provided
Terminals.

PUB41004

Data Communications Using
Voiceband Private Line
Channels -October 1973

Describes voiceband channel arrangements for
private line data transmission. Provides analog
impairment limits supported on channels, and
digital performance supported with Bell System
service offerings; interface requirements for
analog channels; engineering considerations for
two-point and multipoint channel usage; and info rm at ion on maintenance and channel
availability.

* Revised
3

PUB41005

Data Communications Using The
Switched Telecommunications
Network-Revised May 1971

Describes the structure and operation of the DOD
network; presents switching and transmission
performance data on the network and discusses
topics related to data communications on the
DOD network.

PUB41006

Attenuation and Envelope Delay
Characteristics from the 1969-70
Switched Telecommunications
Network Connection Survey June 1973

Provides detailed information on attenuation and
envelope delay characteristics on toll connections from the 1969-70 Switched Telecommunications Network Connection Survey.

PUB41007

1969 - 70 Switched
Telecommunications Network
Connection Survey (Reprints
of Bell System Technical
Journal Articles) April 1971

Describes analog transmission parameter performance, low-speed data transmission performance, and high-speed voiceband data transmission performance of the Switched Telecommunications Network. This is a series of three
Bell System Technical Journal Articles which
summarize Bell Telephone Laboratories'
1969-70 Connection Survey.

PUB41008

Analog Parameters Affecting
Voiceband Data Transmission Description of Parameters July 1974
Transmission Parameters
Affecting Data Transmission Measuring TechniquesRevised May 1975

A tutorial describing analog parameter which may
effect data transmission over voiceband channels.

PUB41009

This Technical Reference br~efly defines the
parameters affecting data transmission described
in the companion Technical Reference
(PUB41008) and describes the techniques used
by the Bel I System to measure these parameters.
In addition, physical and environmental requirements of test equipment used by the Bell System
are provided.

PUB41011

Transmission Specifications for
Voice Grade Private Line
Protective Relaying Channels May 1973

This Technical Reference provides information
on a voice grade private line channel specifically
designed for power industry protective relaying
applications.

PUB41012

1A Data Station, Multichannel
Arrangement Used in Provision
of Two-Point Channelizing
Service -June 1973

The 1A Data Station, Multichannel Arrangement is
a frequency division multiplexer capable of deriving 75and/or150 baud channels from a 3002 private line voiceband channel. It is arranged for
mounting on the customer's premises and provides test capability for trouble sectionalization.

PUB41013

Transmission Specifications for
Low Speed Signaling System
Channels-July 1975

Describes a private line channel capable of
unidirectional transfer of customer generated
signals generally characterized as "McCulloh"
systems. Metallic continuity is not a requirement
of this channel.

4

PUB41021

Digital Data System - Channel
Interface Specifications Preliminary-March 1973

Describes the Digital Data System (DDS) and the
interface between the channel termination equipment of the DDS, contained in a Channel Service
Unit (CSU) and the customer's data terminal
equipment. A CSU is used when the customer's
equipment performs the following functions: coding and decoding, timing recovery, synchronous
sampling, formatting, and generation and recognition of control signals. Also see PUB41 450.

PUB41022

Multistation DATAPHONE®Dig ital
Service -Preliminary September 197 4

Describes the Multistation DATAPHONE®Digital
Service which utilizes the Digital Data System
(DDS) to provide a full-duplex transmission
capability between a control station and two or
more remote stations. Each station may have the
service terminated in either a DDS Channel S.ervice Unit (CSU) or a Data Service Unit (DSU),
described in PUB's 41021 and 41450, respectively. Data can be transmitted at the synchronous
data rates of 2.4, 4.8, 9.6, or 56 kb/s.

Data Sets, Data Auxiliary Sets and Data Service Units
PUB41101

Data Set 1 03A Interface
Specification -February 1967

Data Set 103A provides full-duplex low-speed
serial data transmission at rates up to 300 bps.
The 103A is used in conjunction with Data Auxiliary Set 80481 and may be arranged for automatic
origination, automatic answering and alternate
voice. This data set is used for DATAPHONE service and in TWX-CE applications.

PUB41102

Data Set 103A3
Data Set 103E
Data Set 103G
Data Set 103H
Interface Specification October 1973

Data Sets 103A3, E, G, and H provide ful I-duplex
low-speed serial data transmission at rates up to
300 bps. The 103E is a basic data set without
power supply and attendant controls and is
designed for multiple set installations. The 103A3
set consists of a 103E in a single unit housing and
operates with a standard key telephone set. The
103G is similar to the 103E but has an integrated
housing and provides a card dialer. The 103H is
also similar to the 103E but is designed for
mounting in a data terminal. The 103G and H are
now rated Manufacture Discontinued. These data
sets are used for DATAPHONE service.

® Registered Service Mark of AT&T Co.

5

PUB41103

Data Set 1 03F Interface
Specification - May 1964

Data Set 103F provides ful I-duplex low-speed
serial data transmission at rates up to 300 bps. It
is intended for use on private line channels and
does not include a provision for voice transmission.

PUB41104

Data Set 11 3A Interface
Specification -August 1973

Data Set 113A is an originate only, full-duplex
low-speed serial data set for use at rates up to
300 bps. This is a Iine powered data set designed
for DATAPHONE service applications.

PUB41105

11 3-Type Data Station Interface SpecificationOctober 1971

Description: The 113-type Data Station provides
for low-speed, serial, FSK, full-duplex data
transmission over the switched telecommunications network. It is intended for use in multiple
data set, answer-only installations such as those
associated with a time-shared computer. The
Data Station consists of Data Sets 1138, an appropriate cabinet (3 available sizes) and Data
Auxiliary Set 804T.

PUB41201

Data Sets 201 A&B August 1969

The Data Set 201-type transmits serial binary
data over voice bandwidth facilities using PSK
modulation. Operation is synchronous full-duplex
or half-duplex and may be at 2000 bps for
DATAPHONE service over the switched telecommunications network or at 2400 bps over conditioned private line channels.

PUB41202

Data Sets 202C&D Interface
Specifications - May 1964

The Data Sets 202C&D provide a medium speed,
binary, serial data transmission system. They
operate at rates up to 1200 bps for DATAPHONE
service and up to 1800 bps on conditioned private Iine channels.

PUB41203

Data Set 202E Series Revised September 1971

The Data Set 202E series is a modularized family
of data set transmitters designed primarily to be
used as input stations in data collection systems.
This data set may be used on either the switched
telecommunications network or on private line
channels and operates at speeds compatible with
Data Sets 202C&D.

PUB41204

Data Set 203-Type Revised Apri I 197 4

The Data Set 203 family is designed to provide
synchronous transmission and reception of highspeed digital data over the switched telecommunications network or conditioned private line
data channels. These sets are capable of operating at bit rates between 1800 and 10,800 bps and
various options such as separate transmitter and
receiver, secondary channel and alternate voice
are available.

6

PU841208

Data Set 202R Interface
Specification-June 1971

The Data Set 202R is a manual only, minimum
feature data set. It may be used on either the
telecommunications network or on private line
channels and operates at speeds compatible with
Data Sets 202C and D.

PU841209

Data Set 208A Interface
Specification - November 1973

The Data Set 208A provides synchronous, binary
4800 bps service over basic (unconditioned)
30E>2-type four-wire channels. Features include
automatic adaptive equalization, 50 millisecond
turnaround time, status lamps and loop-around
test capabilities. These features make the set
especially well suited for multipoint polling applications as well as point-to-point systems.

PU841210

Data Set 201 C Interface
Specification -April 1973

The Data Set 201 -type transmits serial binary
data over voice bandwidth facilities using PSK
modulation. Operation is synchronous ful I-duplex
or half-duplex and may be at 2000 bps (201 A) or
at 2400 bps (201 8 or 201 C) over the Switched
Telecommunications Network or private line
channels.

PU841211

Data Set 2088 Interface
Specification -August 1973

The Data Set 2088 provides synchronous, binary
4800 bps service on the switched telecommunications network. Features include automatic
adaptive equalization, 50 millisecond turnaround
time, built-in line control, status lamps, and extensive testing capabilities which provide powerful
system trouble isolating tools. These features
make the set especially well suited for switched
network systems requiring reliable high thruput
service.

PU841212

Data Sets 202S and 202T Interface Specification August 1974

Data Sets 202S and 202T, members of the new
data set family, provide 1200 bps asynchronous
service on the Switched Network and 1800 bps
asynchronous service on the private I ine
facilities, respectively. These data sets are line
compatible with all 202-Type Data Sets; and provide an optional 5 bps reverse channel, indicator
tamps that visually display the status of the set,
and test features which provide the customer, as
well as the Telephone Company, with fault isolating capabilities.

PU841213

Data Set 209A Interface
Specification-PreliminaryMay 1974

The Data Set 209A is a synchronous, binary serial
9600 bps data set for use on a voiceband (a 3002
data channel equipped with Type D-1, High Performance Data Conditioning) 4-wire private line.
The data set features multiplexing options, rapid
start-up times, extensive customer testing
capabilities, modern design technology, and an
attractive appearance.

7

PUB41301

Data Set 301 B Interface
Specification - March 1967

The Data Set 301 B provides for the transmission
of binary serial synchronous data at 40,800 bps.
This data set requires a group bandwidth channel
and is used in private line applications only.

PUB41302

Wideband Data Stations
303-Type Interface
SpecificationRevised December 1974

Data Stations 303 comprise a family of wideband
data stations for use in the transmission of serial
binary synchronous or nonsynchronous data.
Speeds available range from 19.2 to 460.8 kbps
and operation may be over either analog or digital
facilities.

PUB41303

The Display Data Set F-58167
Used to Provide Computer
Access Service for
PICTUREPHONE Stations Preliminary-August 1970

The Display Data Set F-58167 provides an interface between a customer-provided computer and
the PICTUREPHONE switching network. This data
set permits the PICTUREPHONE station to interact with the computer and generates character
display signals which are displayed on the PICTUREPHONE screen.

PUB41304

Wideband Data Set 306-Type
Interface Specification July 1971

Data Set 306A provides for the transmission of
serial binary synchronous data at the transfer rate
of 1.344 Mb/s over T1 carrier facilities.

PUB41 403

Data Set 4 0 1 J I n t er face
Specification -September 1965

Data Set 401 J is a multi-frequency data receiver
intended for use on DATAPHONE service. It can
receive either 3-out-of-14 or 2-out-of-8 parallel
signals at a speed of up to 20 characters/second.

PUB41 405

Data Sets 402C - 402D
Interface Specification November 1964

Data Sets 402C (transmitter) and 402D (receiver)
compose a medium speed, binary, parallel data
transmission system for DATAPHONE Service or
private line service. The system will transmit any
number of data levels up to 8 at any speed up to
75 characters per second.

*PUB41 408

Data Set 407 Interface
Specification-PreliminaryRevised June 1975

Data Set 407 is a multi-frequency data receiver
designed for multiline installations. The data set
receives at a rate of up to ten (10) characters per
second over the switched telephone network or
over basic (unconditioned) private lines from
TOUCH-TONE®telephone sets, TOUCH-TONE
pads, Bell System 401 -type data set transmitter
in the "numeric mode" (two out of eight signals),
or equivalent signal sources.

®Registered Service Mark of AT&T Co.
*Revised - Supersedes "Data Set 407 A Interface Specification - November 1973"

8

PU841450
and
PU841450A

Digital Data System -Data
Service Unit Interface
Specifications-PreliminaryMarch 1973
Addendum - November 1 97 4

A data Service Unit (DSU) is used on data services provided via the Digital Data System (DDS).
It provides plug-for-plug interchangeability with
existing EIA Type D or E interfaces at synchronous speeds of 2400, 4800, and 9600 bits
per second. At 56,000 bits per second the DSU
provides the standard CCITT balanced de interface. Also see PU841021.

PU841451
and
PU841451A

1.544 M8/S Service Channel
Interface Specifications Pre Iiminary February 197 4
Addendum-January 1975

A service channel providing point-to-point, full
duplex transmission of serial bipolar synchronous
pulses at a transfer rate of 1.544 Mb/s with constraints on signal format.

PU841601

Data Auxiliary Set 801 A
(Automatic Calling Unit) Interface
Specification-March 1964

The Data Auxiliary Set 801 A is a de dial pulse
Automatic Calling Unit (ACU) which permits a
business machine to place calls over the
switched telecommunications network. In operation, a telephone number stored in the business
machine is passed to the ACU which sets up the
call and transfers the circuit to the associated
data set for the automatic transmission of data.

PU841602

Data Auxiliary Set 801 C
(Automatic Calling Unit) Interface
Specification - September 1965

The Data Auxi Iiary Set 801 C is a TOUCH-TONE
dialing Automatic Calling Unit (ACU) which permits a buswness machine to place calls over the
switched telecommunications network. In operation, a telephone number stored in the business
machine is passed to the ACU which sets up the
call and transfers the circuit to the associated
data set for the automatic transmission of data.

Data Communications Systems and Terminals
PU841701

8383 Teletypewriter Selective
Cal Iing System September 1967

The 8383 Teletypewriter Selective Calling
System is five-level half-duplex private line
system using Model 28 equipment at speeds up
to 100 words per minute. The traffic flow is
governed by a control station which
automatically polls the other stations to start
their tape readers.

PU841702

85A 1 and 85A2 Data Selective
Calling Service Stations October 1971

The 85A-type Data Selective Calling Service
Stations are used in providing eight-level, halfduplex, private line selective calling systems.
The 85A 1 station pro vi des for 100 wpm operation
using Model 33 or 35 equipment while the 85A2
station provides for 150 wpm operation using
Model 37 equipment. The traffic flow is administered by a customer-provided computer
(line control station) which sequentially polls the
station transmitter and selects the designated
receivers.

9

PU841703

86A 1 and 86A2 Data Selective
Calling Service Stations ~
June 1969

The 86A1 and 86A2 Data Selective Calling Service Stations are used in providing eight-level
half-duplex selective calling systems. The 86A1
station provides for 100 wpm operation using
Model 33 or 35 equipment while the 86A2 station
provides for 150 wpm operation using Model 37
equipment. Control of these stations is from a
customer-provided computer (line control stations). 86A-type stations are used in applications
where the customer-provided computer controls
both half- and full-duplex circuits.

PU841704

868-Types Data Selective Calling
System Stations November 1968

868-type Data Selective Calling System Stations
are used in providing 8-level full-duplex selective
calling systems. The 8681 stations operate at
100 wpm using Model 33 and 35 equipment. The
8682 stations operate at 150 wpm using Model
37 equipment. Control of these stations is from a
customer-provided computer.

PU841705

Data Line Concentrator System
(DLCS) Arrangements May 1971

Data Line Concentrator System Arrangements
provide for the connection of a number of stations
to a smaller number of computer communications
ports. The service includes a data line concentrator, private line transmission facilities and is used
with Model 33 or 35 Teletypewriters and also
customer-provided terminals.

PU841706

Model 37 Teletypewriter Stations
for DATAPHONE Service September 1 968

Describes the operating and line characteristics
of the M37 Teletypewriter Station operating on
DATAPHONE Service. Included is a list of
features that are available or are planned to be
available.

PU841707

DATASPEED® Type-4 System September 1 969

The DATASPEED Type-4 Service is a paper tape
transmission system operating at either 1050
wpm or 1 200 wpm. This system provides errordetection and correction by tape pull back and
re-transmission on error indication.

PU841708

Type-5 DAT ASPEED System June 1970

The DATASPEED Type-5 system is a medium
speed paper tape transmission operating at 750
wpm. the system uses a separate sender and
receiver and can accommodate 5-, 6-, 7-, or 8level paper tape.

PU841709

Receive-Only DATASPEED
Printer Station Agreements
System Interface Specification January 1 970

The receive-only DATASPEED Printer is a high
speed nonimpact terminal. It operates at either
1050 wpm or 1 200 wpm using serial transmission
and 750 wpm using parallel transmission.

®Registered Service Mark of AT&T Co.
10

PUB41710

4200 Series Magnetic Tape
Terminal -August 1970

The 4200 Series Magnetic Tape Set will send
from or receive data and record it on magnetic
tape in a 150,000-character capacity cartridge.
This system accommodates an eight-level code
and operates at speeds from 100 wpm to 2400
wpm.

PUB41712

DAT ASPEED Type-2 System December 1970

The DATASPEED Type 2 system is a medium
speed, serial data transmission system. The
system consists of a Sending terminal, paper tape
punch, and a receiving terminal, paper tape
punch. Operating speed is 1050 wpm using a
202-type data set. Information presented consists of on-line signa1ing and terminal characteristics.

PUB41713

Models 33, 35 and 37 Stations for
Point-to-Point Private Line
Service-August 1971

Describes Point-to-Point Private Line Service in
which Model 33, 35 or 37 Teletypewriter Stations
are connected to one or both points on a communication link. The arrangements described are
composed of two interconnecting stations and
their communications control capability.

PUB41714

9131 Teletypewriter Selective
Calling Station Arrangement January 197 4

The 9131 Teletypewriter Selective Calling Station Arrangement is used in providing an eightlevel, half-duplex, private line selective calling
system. It provides for 100 wpm operation using
Model 33 or 35 teletypewriters. It is a contention
type system (i.e., not controlled by a master station) intended primarily for handling intraline
traffic.

PUB41715

DATASPEED 40 Stations for
DATAPHONE Service Preliminary-December 1973

The DATASPEED 40 is a medium speed data terminal which provides advanced facilities for entering, displaying, editing, printing, sending and
receiving data. DATAPHONE operation at 1050
or 1 200 bits per second using 202-type data sets
is described.

Data Interconnection
PUB41800

Complete Set of Data Interconnection Technical References

PUB41801

Data Access Arrangement CDT
for Manual Originating and
Answering TerminalsRevised May 1973

Data Access Arrangement CDT is used to connect customer-provided terminal equipment to
the switched telecommunications network. It provides for manual origination and answering of
calls and includes a standard telephone set
equipped with an exclusion key used to manually
transfer between the TALK and DATA modes.

11

PUB41 802

Data Couplers CBS and CBT for
Automatic Terminals Revised May 197 4

Data Couplers CBS and CBT are used to connect
customer-provided terminal equipment to the
switched telecommunications network. They provide for automatic answering, terminating and/or
de dial pulse originating of calls and include a
network control signaling unit and a data access
arrangement. Data Coupler CBS provides EIA-RS
232C voltage type control leads. Data Coupler
CBT provides contact closure type control leads.
The conditions under which customer-provided
data stations may generate tone signals for the
purpose of addressing the switched telecommunications network are described.

PUB41803

Acoustic and Inductive Coupling
for Data and Voice Transmission - October 1972

Provides information of interest to the designer of
acoustically or inductively coupled data and
voice transmission equipment. Information includes system design considerations, transmission speeds, transmission to other data sets,
power limitations, and a test instrument assembly.

# PUB41804

Switched Network
Transaction Telephone
System - Pre Iiminary June 1975

The Transaction Telephone System is a shortmessage inquiry-response system, connecting
transaction telephone terminals to a customers
computer center via the switched telecommunications network. It provides a service in
which inquiries are sent semi-automatically as
TOUCH-TONE signals, and responses are
returned in either voice or visual form.

VOICE COMMUNICATIONS
PUB42000

Complete Set of Voice Communications Technical References

*Protective Connecting Arrangments - Manual, Terminal

usoc
PUB42101

QKTRevised June 1971

Manual connecting arrangement used for the connection of customer-provided voice transmitting
and/or receiving equipment or communications
systems to a PBX or central office station line
through a Telephone Company-provided
telephone set equipped with an exclusion key.

PUB42102

CDXRevised February 1973

Manual voice connecting arrangement used to
connect a customer-provided device, typically
patching devices, which enables the connection
of an incoming call to a Telephone Company provided PBX and an outgoing central office trunk
line from a Telephone Company-provided PBX.

#New Technical Reference

* PUB41803 listed under the Data Interconnection section provides information of interest to the
designer of acoustically or inductively coupled devices for Voice as well as Data Transmission.

12

PUB42103

CEBAX/CEBBX - Pre Iiminary Revised June 1970

Voice Connecting Arrangement CEBAX permits a
customer to manually connect and disconnect
customer-provided equipment, typically multiline conferencing devices, to a specific line terminated on a Telephone Company-provided key
set (control station). For use with customer-provided equipment with only one supervisory contact. Furnished on a per line per control station
basis.
Voice Connecting Arrangement CEBBX permits a
customer to manually connect and disconnect
customer-provided equipment, typically multiline conferencing devices, to a specific line terminated on a Telephone Company-provided key
set (control station). For use with customer-pr:ovided equipment with two supervisory contacts.
Furnished on a per line basis.

PUB42104

LOH - Preliminary July 1970

Voice connecting arrangment permitting the connection of customer-provided background music
or other recorded material to central office lines
terminated in a Telephone Company-provided
switchboard.

PUB42105

LVH -Preliminary July 1970

Voice connecting arrangement permitting the
connection of customer-provided background
music or other recorded material to central office
or PBX lines, terminated in Telephone Companyprovided key telephone sets, while the line is in
the hold mode.

PUB42106

CEBAV - Preliminary August 1970

Voice connecting arrangement which permits a
customer to manually connect and disconnect
customer-provided equipment, typically manual
announcement sets, which answers an incoming
call, to a specific line terminated on a Telephone
Company-provided key set (control station). For
use with customer-provided equipment with only
one supervisory contact.

PUB42107

CEBAW-PreliminaryAugust 1970

Voice connecting arrangement which permits the
customer to manually connect and automatically
disconnect customer-provided equipment,
typically intercom systems, to a specific line terminated on a Telephone Company-provided key
set (associated station). For use with customerprovided equipment with two supervisory contacts.
13

PUB42108

FTP-PreliminaryApril 1974

Voice Connecting Arrangement F!P provides a
means of connecting a customer-provided
source of music or recorded information to the
Music-On-Hold and/or Background-Music-OverPaging features of the Telephone Company-provided Com-Key®718 and 1434 Communications
Systems.

*PUB42109

FTM - Preliminary November 1975

Protective Connecting Arrangement FTM provides a means of connecting a customer-provided source of music or recorded information to
the Music-On-Hold feature of a Telephone Company-provided key telephone system.

Protective Connecting Arrangements - Automatic, Terminal
# PUB42201

Protective Connecting Arrangement CAU is an
alarm coupler which provides one-way transmission for use with customer-provided alarm device
with dial pulse signaling.

CAU/SU3/SU4/SUe Revised October 1975

SU3 is a tone signaling unit for use with Protectiv,e Connecting Arrangements CAU or SUe permits the operation of the alarm device to be
tested or verified from a remote location.
Protective Connecting Arrangement SU4 is the
combination of Protective Connecting Arrangements CAU and SU3. There is no assigned code
for the combination of Protective Connecting Arrangements sue and SU3.
Protective Connecting Arrangement SUe is an
alarm coupler modified to provide two-way
transmission, to permit detection of dial tone or
proper signal from a remote point. See SUeAQ.
PUB42202

SU7QWRevised April 1975

Protective Connecting Arrangement SU7QW provides the means for automatically connecting
customer-provided dial pulse repertory dialers.

PUB42203
and
PUB42203A

RTT - Preliminary January 1970
Addendum -October 1974

Connecting arrangement that generates a tone to
both parties under control of a customer-provided call duration timer.

PUB42204

RDL/RDM-PreliminaryRevised January 1973

Voice Connecting Arrangement RDL is a recorder
coupler arranged for one-way recording Voice
Connecting Arrangement ROM is a recorder
coupler modified to provide two-way
simultaneous transmission. See RDMZR.

*New Technical Reference
®Registered Trademark of AT&T Co.
~ Revised-Supersedes 11 CAU/SU3/SUe - Preliminary - November 19e9"

14

PUB42205

RCZRevlsed July 1975

PUB42206
and
PUB42206A

RC1 -PreliminaryRevised June 1971
Addendum -October 197 4

PUB42207

C2ACP /C2AKS Revised February 1975

Recorder connector used to connect customerprovided two-way recording equipment which
provides a distinctive
Connecting arrangement which provides the
means for customer-provided equipment to cause
a· short burst of 1400Hz tone to be sent to the
local part; used for call duration timing.
Protective Connecting Arrangement C2ACP is an
automatic arrangement used to connect
customer-provided terminal equipment to a.
WATS access line, a central office station line, or
a PBX/Centrex extension line.
Protective Connecting Arrangement C2AKS is an
·automatic arrangement used to connect
customer-provided terminal equipment to a
WATS access line, a central office station line, or
a PBC/Centrex extension line which concurrently
terminates in a Telephone Company-provided
station.

PUB42208

STC - Pre Iiminary Revised February 1974

Voice connecting arrangement that provides the
means for automatically connecting customerprovided transmitting and receiving speech terminal equipment, e.g., telephone sets, utilizing a
three-wire interface.

PUB42209

RDMZR/RDYRevised December 1973

Voice Connecting Arrangement RDMZR provides
the means for automatically connecting customer
provided receive-only speech terminal equipment, e.g., answering sets; it supersedes and
replaces Voice Connecting Arrangement ROM.
Voice Connecting Arrangement ROY provides all
of the features of Voice Connecting Arrangement
RDMZR and, in addition, provides volume-limited
receive transmission.

PUB42210

Voice Connecting Arrangement SU6AQ provides
the means for automatically connecting
customer-provided transmitting and receiving
speech terminal equipment, e.g., alarm systems,
utilizing a multi-wire interface; it supersedes and
replaces Voice Connecting Arrangement SU6.

SU6AQ/STS-Preliminary June 1971

Voice Connecting Arrangement STS provides all
of the features of Voice Connecting Arrangement
SU6AQ and, in addition, permits the transmission
of customer-provided supervisory tone signals; it
provides an alternative to Voice Connecting Arrangement SU3.
15

PUB42211

CEZ - Preliminary November 1971

Voice connecting arrangement which permits the
manual connection and automatic disconnection
of customer-provided equipment (typically conferencing devices) to a specific line on an associated Telephone Company provided key
telephone set.

PUB42212

STP -Preliminary May 1973

Voice Connecting Arrangement STP provides a
means for automatically connecting customerprovided transmitting and receiving speech terminal equipment, e.g., key telephone systems.

PUB42213

ADI - Preliminary October 197 4

Connecting Arrangement ADI provides a means to
associate dial pulse dialers with single or multiline telephone sets.

PUB42214

GTS - Preliminary December 197 4

Protective Connecting Arrangement GTS provides a means of connecting an automatic
answering device to a telephone line. The
customer-provided answering device connects
via a standard 4-prong telephone jack.

Protective Connecting Arrangements - Manual, System
PUB42301

2A (COB) -PreliminaryFebruary 1969

Manual voice connecting arrangement used to
connect a line from a customer-provided system,
which provides supervisory signals, to a central
office trunk line through a Telephone Companyprovided cord switchboard position.

PUB42302

1A (CDA) ~Preliminary June 1969

Manual voice connecting arrangement used to
connect a cord switchboard position of a
customer-provided system, which provides
supervisory signals, to an exchange trunk line.

PUB42303

3A (CON) -PreliminaryJune 1969

Manual voice connecting arrangement used to
connect a line from a customer-provided system,
which provides supervisory signals, to an exchange line through a Telephone Company-provided key station.

PUB42304

CD1 -PreliminaryJuly 1969

Manual voice connecting arrangement used to
connect a cord switchboard position of a
customer-provided system, which does not provide supervisory signals, to an exchange trunk
line.

PUB42305

CD4 - Preliminary August 1969

Manual voice connecting arrangement used to
connect a line from a customer-provided system,
which does not provide supervisory signals to an
exchange trunk line through a Telephone Com,;,
pany-provided cord switchboard position.

16

PUB42306

CD5 -Preliminary August 1969

Manual voice connecting arrangement used to
connect a line from a customer-provided system,
which does not provide supervisory signals, to an
exchange line through a Telephone Companyprovided key telephone station.

PUB42307

COY - Preliminary October 1969

Voice connecting arrangement used to terminate -without exchange connection-a line
from a customer-provided system in a Telephone
Company-provided key telephone station.

Protective Connecting Arrangements - Automatic, System
PUB42401

Automatic voice connecting arrangement used to
connect the attendant position and dial switching
equipment of a customer-provided system to an
exchange trunk line arranged for two-way combination rotary or TOUCH-TONE service.

CDH and CBFRevised March 197 4

Connecting Arrangement CBF is provided in addition to CDH when Data Communications equipment is used behind the PBX. CBF provides a
linear attenuator which limits the three-second
average power level transmitted to the central
office without distorting the signal. The maximum
allowable power level is determined at the time of
installation.
PUB42402

CD7 /CDB/CD9 and CBF Revised March 1974

Voice Connecting Arrangement CD7 is an
automatic arrangement used to connect the attendant position of a customer-provided system
to an exchange trunk line arranged for one-way
outgoing rotary or TOUCH-TONE service.
Voice Connecting Arrangement COB is an
automatic arrangement used to connect the dial
switching equipment of a customer-provided
system to an exchange trunk line arranged for
one-way outgoing rotary or TOUCH-TONE service.
Voice Connecting Arrangement CD9 is an
automatic arrangement used to connect the attendant position of a customer-provided system
to an exchange trunk line arranged for two-way
rotary or TOUCH-TONE service.
Connecting Arrangement CBF is provided in addition to CD7, COB, or CD9, when Data Communications equipment is used behind the PBX. CBF provides a linear attenuator which limits the threesecond average power level transmitted to the
central office without distorting the signal. The
maximum allowable power level is determined at
the time of installation.
17

PUB42403
and
PUB42403A

CET -PreliminaryOctober 1970
Addendum -June 197 4

Automatic voice connecting arrangement used to
connect a customer-provided system to an exchange trunk line arranged for one-way service to
the operator position of a Telephone Company
long distance switchboard (the equivalent of a
toll terminal).

PUB42404

CD6 - Preliminary December 1 969

Automatic voice connecting arrangement used to
connect an exchange trunk line arranged for oneway incoming service to the attendant position of
a customer-provided system.

PUB42405
and
PUB42405A

CED - Preliminary April 1970
Addendum - June 197 4

Automatic voice connecting arrangement used to
connect a customer-provided system to an exchange trunk line, arranged for two-way service,
to the operator position of a Telephone Company
long distance switchboard (the equivalent of a
toll terminal).

PUB42406
and
PUB42406A

C22 - Preliminary March 1971
Addendum -October 1972

Automatic voice connecting arrangement used to
connect an exchange trunk line arranged for oneway direct inward dialing (DID) service to the dial
switching equipment of a customer-provided
system.

PUB42407

C24/C2H - Preliminary October 1971

Voice Connecting Arrangement C24 is an
automatic arrangement used for two-way service
which provides a four-wire voice transmission interface for connecting customer-provided channel facilities to a Telephone Company PBX. An E
and M type signaling interface is provided.
Voice Connecting Arrangement C2H is an
automatic arrangement used for two-way service
which provides a four-wire voice transmission interface for connecting customer-provided channel facilities to Telephone Company Centrex service. An E and M type signaling interface is provided.

PUB42408

C27 /C2K - Preliminary October 1 971

Voice Connecting Arrangement C27 is an
automatic arrangement used for two-way service
which provides a two-wire voice transmission interface for connecting customer-provided channel facilities to a Telephone Company PBX. An E
and M type signaling interface is provided.
Voice Connecting Arrangement C2K is an
automatic arrangement used for two-way service
which provides a two-wire voice transmission interface for connecting customer-provided channel facilities to Telephone Company Centrex service. An E and M type signaling interface is provided
18

Protective Connecting Arrangements - Private Line
PUB42501

CDQ4W -PreliminaryAugust 1969

Automatic voice connecting arrangement arranged for two-way service which provides a
four-wire voice transmission interface to
customer-provided dial switching equipment used with a Telephone Company-provided fourwire private line channel equipped with
Telephone Company-provided channel signaling
with a contact-type signaling interface.

PUB42502

CDQ2W/CDQ2X Preliminary June 1971

Voice Connecting Arrangement CDQ2W is arranged for two-way service, and provides a twowire interface to customer-provided dial switching equipment. Used with Telephone Companyprovided private line channel and Telephone
Company-provided channel signaling with a contact-type signaling interface.
Voice Connecting Arrangement CDQ2W is arranged for two-way service, and provides a twowire interface to customer-provided dial switching equipment. Used wlth Telephone Companyprovided private line channel and Telephone
Company-provided channel signaling with an Eand M-type signaling interface.

PUB42503

C234W-PreliminaryFebruary 1971

Voice connecting arrangement for two-way service, which provides a four-wire voice transmission interface to customer-provided dial switching equipment. Used with a Telephone Companyprovided four-wire private line channel and
customer-provided channel signaling.

PUB42504

C232W-PreliminarySeptember 1971

Voice connecting arrangement arranged for twoway service, which provides a two-wire interface
to customer-provided dial switching or station
terminal equipment. Used with a Telephone Company-provided private line channel and customerprovided channel signaling (inband signaling
only).

PUB42505

CDQ4X - Preliminary October 1971

Automatic voice connecting arrangement arranged for two-way service, which provides a
four-wire interface to customer-provided dial
switching equipment. Used with a Telephone
Company-provided four-wire private line channel
equipped with Telephone Company-provided
channel signaling with a E and M signaling interface.

19

Protective Connecting. Arrangements - Miscellaneous
PUB42601

CEK - Preliminary April 1970

Connecting arrangement used to associate
customer-provided message registers where the
customer is providing the communications
system and the necessary equipment to associate the station with the message registers with a
central office trunk line.

PUB42602

CAK -Preliminary Revised May 1972

Specification CAK describes a procedure used
by AT &T Co. for the evaluation of customer-provided antique/decorator set housings. Replaces
B drawings previously furnished by the local
Telephone Companies.

PUB42603

C1 V/RCX/GC2 - Pre Iiminary Revised June 1972

Connecting Arrangement C1 Vis used to connect
customer-provided elapsed time or pen register
equipment to PBX WATS lines, PBX central office
trunks or station lines. This arrangement provides
a closure that is maintained when the line is offhook and will not follow dial pulses.
Connecting Arrangement ACX is used to connect
customer-provided elapsed time or pen register
equipment to PBX WATS lines, PBX central office
trunks, or station Iines. This arrangement provides a closure that is maintained when the line is
off-hook and opens on each dial pulse.
Connecting Arrangement GC2 consists of an ac
ring-up relay bridged across the line. Provides a
contact closure to customer-provided equipment
when ringing voltage is present. Used with ring
indicator devices.

PUB42604

C25 -Preliminary July 1971

Connecting arrangement used to connect the
customer-provided automatic number identification equipment of a customer-provided communications system to a Bell System central
office for automatic identified outward dial (AIOD)
service.

PUB42605

CTD Revised June 1975

Protective connecting arrangement used to connect customer-provided call diversion equipment
to a Telephone Company CO trunk terminated on
a Telephone Company PBX. The arrangement
provides a high impedance line status indication
of the supervisory and address signals on the
trunk and receives a contact closure to cause
diversion of an outgoing call from the PBX in the
normal manner.

\

20

PUB42606

HZM - Preliminary November 197 2

Connecting Arrangement HZM is used to connect
customer-provided traffic measuring equipment
to station lines, PBX C. 0. trunks, and some types
of tie lines. Permits the deduction of on-hook, offhook, dial pulse, TOUCH-TONE, and signaling
through a high resistance connection to the line.

PUB42607

VCP-NOTICEMay 25, 1973

Connecting Arrangement VCP provides the
capability for a customer, on an optional basis, to
supply the de power to voice connecting arrangements associated with customer-provided
PBX's and certain other voice connecting arrangements where specifically provided for in its
technical reference.

PUB42608

KTX - Preliminary October 1973

Connecting arrangement used to connect
customer-provided call diversion equipment to a
Telephone Company line terminated in a
Telephone Company Key Telephone System. The
arrangment provides a high impedance line status
indication of the supervisory and address signals
on the line and receives a constant closure to
divert an outgoing call. Restriction tone or an announcement is provided by the customer.

PUB42609

CTH -PreliminaryDecember 1973

Protective connecting arrangement used to connect customer-provided call diversion equipment
to a Telephone Company C.O. trunk terminated in
a Telephone Company PBX. The arrangement
provides a high impedance line status indication
of the supervisory and address signals on the
trunk and receives a contact closure to cause
diversion of the call. Restriction tone or an announcement is provided by the customer.

Protective Connecting Arrangements - PBX Adjuncts
PUB42701

DCT - Pre Iiminary June 1971

Voice connecting arrangement (formerly designated Recorded Telephone Dictation Trunk Circuit) which provides trunk level access, e.g.,dial
"7", from a station on a Bell System PBX or
Centrex system to customer-provided dictation
equipment.

PUB42702

DCW - Pre Iiminary July 1971

Voice connecting arrangement (formerly designated Interface Trunk Circuit) which provides a
two-part trunk level access,e.g.,dial "7", from a
station on a Bell System PBX or Centrex system
to customer-provided equipment capable of
receiving dialed digits (serial or parallel coded)
for central purposes.

21

PUB42703

DCK/DCLRevised October 1974

Voice Connecting Arrangements DCK and DCL
provide trunk level access,e.g.,dial "7" from a
station on a Bell System PBX or Centrex system
to customer-provided equipment (e.g., dictation
or radio paging) capable of receiving TOUCHTONE digits directly or dial pulse digits over a
separate pair for control purposes.

PUB42704

TSPXY /TSPZ1 - Preliminary March 1975

Protective Connecting Arrangements TSPXY and
TSPZ1 provide a means of connecting customerprovided recording and control equipment to PBX
trunks. With these arrangements, an outgoing
trunk can be split to allow dialing extra digits or
to pulse a number into the central office.

RADIO AND TRANSMISSION ENGINEERING
PUB43000 Complete Set of Radio and Transmission Engineering Technical References.

Private Line Facilities
PUB43101

Voice Grade Entrance Facilities
for Extending Customer-Provided
Communications Channels Preliminary - May 1969

Describes the various entrance facility serving
arrangements, provides transmission characteristics of entrance facilities, describes signal
power limitations and discusses the division of
responsibility for design, operation and maintenance.

PUB43201

Private Line Interconnection
Voice Applications Preliminary - June 1970

Describes the standard private line offerings for
voice applications which may be interconnected
at one or both ends with customer-provided
voice communications systems or terminal equipment. Also describes minimum protection criteria,
signaling arrangements and maintenance techniques.

PUB43401

~Transmission

Specifications for
Private Line Metallic Circuits Preliminary-December 1971

Describes the signal level criteria objectives for
private line metallic circuits (cable pairs without
signal battery or amp Iification devices). This
material is provided for those who use the
metallic continuity of local private line channels
implemented by wire pairs. It should be noted that
the Telephone Companies have no obligation to
provide private line channels on a metallic basis.

Domestic Public Land Mobile
Telephone Service-CustomerProv i ded Dial Stations Preliminary-March 1973

Provides information needed to interface
customer-provided mobile telephone dial stations with Telephone Company-provided mobile
telephone radio systems.

Mobile Radio
PUB43301

22

PUB43302

Intermodulation Interference in
Radio Systems November 197 2

With the explosive growth of radio systems,
problems of "overpopulation" are beginning to
misuse valuable radio spectrum. One of the principal overpopulation problems encountered today, yet one about which relatively little information is available, is intermodulation interference.
This Technical Reference represents present
views of the problem and presents some possible
solutions.

PUB43303

Domestic Public Land Mobile and
Maritime Radio Service System
Interface CriteriaPreliminary - June 197 4

This Technical Reference is a guide for designers, manufacturers, and operators of common
carrier radio systems which interface with the
Bell System telephone network. The document
describes the electrical information which must
pass between a Bell System Central Office and a
common carrier radio system in order to originate
and terminate calls. This Technical Reference is
not intended to provide complete design
specifications or parameters or to assure the
qua Iity or performance of the common carrier
radio system.

PICTUREPHONE SERVICE
PUB44000 Complete Set of PICTUREPHONE Service Technical References
PICTUREPHONE Interconnection
PUB44101

PICTUREPHONE connecting arrangement which
permits the connection of customer-provided
video/audio terminal equipment to PICTUREPHONE facilities using a Telephone Company-provided TOUCH-TONE telephone set.

PVF - Preliminary September 1970

ATTESTATION PROGRAMS
PUB45000 Complete Set of Attestation Program Technical References
Headsets
PUB45001
and
PUB45001A

PUB45002
and
PUB45002A

4-Wire Headset Interface Terminations and Interface
Specification 1001 Preliminary-Revised July 1973
Addendum - August 197 4

Provides the procedural requirements and technical specifications (Interface Specification 1001 )
for the attestation of certain customer-provided
4-wire headsets for use with headset jacks
(Headset Interface Terminations) in Bell System
attendant switchboards, attendant consoles, and
telephone sets.

6-Wire Headset Interface Terminations and Interface
Specification 1002 Preliminary-October 1974
Addendum - January 197 5

Provides the procedural requirements and technical specifications (Interface Specification 1002)
for the attestation of certain customer-provided
6-wire headsets for use with headset jacks
(Headset Interface Terminations) in Bell System
attendant switchboards, attendant consoles, and
telephone sets.

23

Non-Powered Conferencing Devices
PUB45101
and
PUB45101 A

Interface Termination JTC and
Interface Specification 2001 Preliminary-May 1973
Addendum - October 1 97 3

Provides the procedural requirements and technical specifications (Interface Specification 2001 )
for the attestation of certain non-powered conferencing devices for use with Interface Termination JTC which is associated with Bel I System
key telephone system stations.

CONFORMANCE PROGRAMS
PUB46000 Complete Set of Conformance Program Technical References
PUB46001
and
PUB46001A

Conformance Program for
Answering Devices Incorporating
Authorized Protective Connecting Modules -PreliminaryRevised January 1975
Addendum - October 197 5

Provides the procedural requirements and technical specifications (Interface Specification 3001 )
for the conforming of certain customer-provided
automatic answering devices for use with individual line exchange service or PBX/Centrex
station service.

24

326-299



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