ATT Definity Addendum 1 For Ds1, Dmi, Isdn Pri Instructions Manual

							CONTENTSxix
LIST OF TABLES
TABLE 1-1.
TABLE 1-2.
TABLE 1-3.
TABLE 3-1.
TABLE 3-2.
TABLE 3-3.
TABLE 3-4.
TABLE 3-5.
TABLE 3-6.
TABLE 3-7.
TABLE 4-1.
TABLE 4-2.
TABLE 5-1.
TABLE 6-1.
TABLE 7-1.
TABLE 7-2.24th-Channel Signaling Arrangement
Data Module Capabilities
BCCOS
CSU #1 and Bit Error Rate Threshold Switch Settings
FS and ES Threshold Switch Settings
Configuration A and B Switch Settings
Equalizer Switch Settings
PWR Switch Settings
XMT (LBO) Switch Settings
System 85 Traditional Module Equalizer Settings (Metallic Cable)
Digital Loss Plan Encodes
Digital Loss Plan (Port-to-Port Losses)
SCS References Switches
Supported Digital Facilities
DS1 Administration — Channel Versus Line Assignments
Trunks Supporting Signaling Type 20
DS1/ISDN-PRI Administration — Channel Versus Trunk Assignments
Network Service/Feature Options
Administration Summary
Equipment Parameters and Permitted Translation Encodes
TN767 Compensation Values
Codeset Mapping Requirements
Codeset Differences
Trunks Supporting Signaling Type 20
DS1/ISDN-PRI Administration — Channel Versus Trunk Assignments
Network Services/Network Features
Line Compensation Settings
R1V4 to R1V5 Translation Upgrade Strategy
Line Compensation Values
Minor/Major Alarm to Errored Seconds Conversions1-15
1-21
1-25
3-4
3-4
3-5
3-5
3-6
3-6
3-13
4-3
4-5
5-10
6-2
7-14
7-25
7-38
7-46
7-49
7-58
7-66
7-73
7-74
7-87
7-98
7-104
7-114
7-119
7-130
8-10
TABLE 7-3.
TABLE 7-4.
TABLE 7-5.
TABLE 7-6.
TABLE 7-7.
TABLE 7-8.
TABLE 7-9.
TABLE 7-10.
TABLE 7-11.
TABLE 7-12.
TABLE 7-13.
TABLE 7-14.
TABLE 7-15.
TABLE 8-1.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							xxCONTENTS
TABLE B-1.
TABLE B-2.
TABLE B-3.
TABLE B-4.
TABLE C-1.
TABLE C-2.
TABLE C-3.
TABLE C-4.
TABLE D-1.
TABLE D-2.
TABLE D-3.
TABLE D-4.50-Pin (25-Pair) Connector Configurations
System 75 Versus System 85 Cable Comparisons
15-Pin Connector Arrangement (System 75/85 Perspective)
8-Position Modular Jack Pin Assignments (System 75 and System 85
Perspective)
Internal Definition Translations
System 85 R2V4 to Generic 2 IE Opcode Translations
User-to-User IE Opcodes
Codeset Map Number to Incoming and Outgoing Translations
Trunk/Signaling Cross References
R2V4 Alternate Signaling Type Translations
Signaling Type Compatibility
Signaling Type Definitions
System 85 R2V4 Administration Settings
System Parameters - Customer Options Screen Administration —
Generic 1
DS-1 Circuit Pack Screen Settings — Generic 1
Processor Interface Data Module Screen Settings — Generic 1
Interface Links Screen Settings — Generic 1
Processor Channel Assignment Screen Settings — Generic 1
Trunk Group Screen Settings — Generic 1
Trunk Group Screen Settings - Page 2 - Incoming Call Handling Table —
Generic 1
Routing Pattern Screen Settings — Generic 1
SID Prefix Table Screen Settings — Generic 1B-14
B-15
B-16
B-17
C-10
C-12
C-12
C-13
D-2
D-6
D-7
D-8
E-1
E-11
E-16
E-19
E-20
E-21
E-24
E-26
E-28
E-29 TABLE E-1.
TABLE E-2.
TABLE E-3.
TABLE E-4.
TABLE E-5.
TABLE E-6.
TABLE E-7.
TABLE E-8.
TABLE E-9.
TABLE E-10.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ABOUT THIS DOCUMENT
PURPOSE
Over the past several years, basic digital signal level 1 (DS1) service has evolved to include new
capabilities and thereby support more sophisticated applications. The three prime applications are:
1.
2.
3.Digital multiplexed interface with bit-oriented signaling (DMI-BOS)
Digital multiplexed interface with message-oriented signaling (DMI-MOS)
Integrated Services Digital Network primary rate interface (ISDN-PRI)
Since these three applications merely build on each proceeding application, and extend basic DS1
service, they are covered in a single document. This document is reissued (as issue 4) to:
1.
2.Include coverage for the 551V ST network channel-terminating equipment (NCTE) (also called the
channel service unit or CSU)
Upgrade System 85 R2V4 administration procedures to include:
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lCoverage for issue 7 of the maintenance and administration panel (MAAP) flip charts
Additions and corrections to the administration procedures
Clarifications on the use of trunk type 120 (ISDN-dynamic) and other trunk types for
providing Call-by-Call (CBC) Service Selection
3.
4.
5.
Add coverage for DEFINITY® Communications System Generic 2 ISDN-PRI
Add coverage for System 75XE DS1/DMI
Add coverage for DEFINITY Communications System Generic 1 ISDN-PRI
This document describes System 75 and System 75XE DS1/DMIs as well as Generic 1 and Generic 2
ISDN-PRI. It introduces and defines the concepts and terminology that are unique to DS1/DMI/ISDN-
PRI. Also included are descriptions of DS1/DMI/ISDN-PRI applications (for both private and public
networks), engineering procedures and considerations, cabling and connection arrangements, and
administration requirements, restrictions, and limitations.
xxi 
						

							xxiiABOUT THIS DOCUMENT
INTENDED AUDIENCES
Since this document contains information ranging from the brief tutorial to the detailed requirements, it
should prove  useful to several groups of readers, including:
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lMarketing personnel
Technical consultants
Network engineers
Installation personnel
System administrators
Account teams
Customers
PREREQUISITE SKILLS AND KNOWLEDGE
While there are no prerequisite skills assumed in this document, a basic understanding of telephony and
networking is required. The GLOSSARY and ABBREVIATIONS appendixes of this document are
provided to assist you in understanding the terminology used herein. See the Related Sources heading
later in this preface, About This Document, for a list of other documents that discuss similar topics.
HOW THIS DOCUMENT IS ORGANIZED
This document consists of the following chapters:
1.
2.
3.
4.
5.INTRODUCTION — Provides a high-level functional description of the DS1/DMI/ISDN-PRI
channels, available framing formats, signaling options, and line coding formats.
NETWORK CONNECTIONS AND CONFIGURATIONS — Describes functional connection
arrangements to private network facilities (private endpoints) and to public network facilities
(public endpoints). Included along with the public network discussions are Switched Access
connections and services. This section also describes connection arrangements using digital
multiplexer transmission equipment.
DS1 — TRANSMISSION AND CABLING — Describes cable distance limitations versus cable
size, permitted cable types, the DSX-1 interface specification, the need and function of customer
service units, on- and off-premises cable configurations, metallic and nonmetallic cable options,
and equalizer and compensation settings.
THE DIGITAL LOSS PLAN — Describes transmission loss concepts, the analog and digital loss
plans and the differences between them, and the user or installer impact (switch settings and
administration values).
SYNCHRONIZATION OF DIGITAL FACILITIES — Describes synchronization strategies,
objectives, and requirements. This chapter also discusses the availability of synchronization
sources and includes the rules for selecting and assigning primary and secondary references and
facilities. 
						

							ABOUT THIS DOCUMENTxxiii
6.
7.PORT TYPES/INSTALLATION COMPATIBILITIES — Describe the DS1/DMI circuit pack
operating modes, slot restrictions, and administration considerations and restrictions. This section
also includes a table that lists the available port types and shows their compatibility on a system,
release, version, and circuit-pack suffix basis.
ADMINISTRATION OPTIONS AND REQUIREMENTS — Covers the following information:
—
—
—
—Describes those procedures that are required for DS1 services, what the available field encode
options are, and the considerations for choosing the options for System 85
Describes those procedures that are required for DS1 services, what the available field encode
options are, and the considerations for choosing the options for DEFINITY Generic 2
Describes the administration screens that are required for DS1 services, any unusual or special
field requirements or considerations, and options for System 75 and System 75XE
Describes the administration screens that are required for DS1 services, any unusual or special½
½
½
½
field requirements or considerations, and options for Generic 1
8.MAINTENANCE AND ALARMS — Describes the diagnostic capabilities and alarms provided
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by DS1/DMI/ISDN-PRI. This part also provides information on methods of alarm analysis and
alarm resolution.
APPENDIXES
A.
B.
C.
D.
E.ADMINISTRATION REQUIREMENTS — Provides screens showing administration field
examples for System 75 (R1V2 and R1V3) special-access connections.
SAMPLE INSTALLATION AND MAINTENANCE PROBLEMS — Describes, with
examples, some of the more typical field problems, such as translation-based, synchronization-
related, and physical-interface connection problems.
ADMINISTRATIVE PROCEDURE SUMMARY — Describes the administrative procedures
used on DEFINITY Generic 2 that relate to the ISDN-PRI, including how pertinent
administrative fields relate to ISDN-PRI level 3 message contents and general feature
operation.
TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLES — Provides tables
that define trunk type to signaling type compatibility for System 85 R2V1, R2V2, R2V3,
R2V4, and Generic 2.
TIE TRUNK SETTING — Provides administrative settings for tie trunks used with ISDN-PRI.½
½
½
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ABBREVIATIONS
GLOSSARY
INDEX
NOTE: Although this document applies specifically to DS1/DMI and to ISDN-PRI, the Generic 2
Remote Group Interface (RGI) is also a DS1 application. As such, portions of chapter 1,
Introduction, chapter 3, DS1 Transmission and Cabling, chapter 4, The Digital Loss Plan, and
chapter 8, Maintenance and Alarms, may also apply in a general sense to the RGI. Specific
information on the RGI is provided in documents on that subject.½ 
						

							xxivABOUT THIS DOCUMENT
HOW TO USE THIS DOCUMENT
How you will use this document will depend on several factors such as the amount of training you have
received or your personal preferences for working with something new. You may want to read this
document from cover to cover, use it merely as a reference when questions arise, or find that something
in between these two extremes will best suit your needs. At the very least, you should make sure that
you are familiar with how the document is organized and what it contains. This can be accomplished by
reading this preface, About this Document, and then carefully scanning the document, taking special note
of all headings.
The Table of Contents and the Index are provided for those times when you have problems finding
information about a specific topic.
TRADEMARKS AND SERVICE MARKS
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l5ESS®, ACCUNET®, Callmaster®, DATAPHONE®, DEFINITY®, DIMENSION® and
MEGACOM® are registered trademarks of AT&T.
ESS™ is a trademark of AT&T.
IBM® is a registered trademark of International Business Machines Corporation.
MS-DOS® is a registered trademark of Microsoft Corporation.
UNIX® is a registered trademark of UNIX System Laboratories, Inc.½
½
½
½
½
RELATED SOURCES
The following documents may be referenced to obtain additional information on specific subjects.
DP2 Channel Service Unit User’s Manual
AT&T DEFINITY® 75/85 Communications System Generic 1 Maintenance
AT&T DEFINITY® 75/85 Communications System Generic 1 and System 75 and
System 75 XE Feature Description
AT&T DEFINITY® 75/85 Communications System Generic 2 Administration
Procedures
AT&T DEFINITY® 75/85 Communications System Generic 2 Maintenance Procedures½
½
½
½
½
½
½
AT&T DEFINITY® 75/85 Communications System Generic 2 Maintenance Repair
Strategies
Network and Data Services Reference
AT&T System 85 Release 2 Version 4 Administration Procedures
999-100-189
555-204-105
555-200-201
555-104-506
555-104-117
555-104-118
555-025-201
555-103-506 
						

							ABOUT THIS DOCUMENTxxv
BCM32000 — Description, Installation, and Maintenance — Digital Transmission
Systems
Channel Division Multiplexer Installation and Maintenance Manual
Channel Expansion Multiplexer Installation and Maintenance Manual
D4-Channel Bank Channel Units — Application Engineering
DEFINITY® Communications System Generic 1.1 to 4ESS Via ISDN PRI Access
DEFINITY® Communication System Generic 2.1 to Generic 1.1 with DCS
DEFINITY® Communications System Generic 2.1 to 4ESS Via ISDN PRI Access
Digital Multiplexed Interface (DMI) Technical Specification Issue 3.2
ESF T1 Channel Service Unit User Manual
Integrated Services Digital Network (ISDN) Primary Rate Interface for AT&T
Communications (Technical Publication 41459)
ISDN-BRI Reference Manual
Performance Quality Analysis
System 85 R2V4 to 4ESS Via ISDN PRI Access
System 85 R2V4 to DEFINITY® Communications System Generic 1.1 via ISDN PRI
Access½
½
½365-287-100
365-165-101IS
365-160-101IS
855-351-105
555-037-234
555-037-238
555-037-237
555-025-204
999-100-305
326-201½
½
555-025-102
190-404-120
555-037-232
555-037-233½
½
HOW TO MAKE COMMENTS ABOUT THIS DOCUMENT
Reader comment cards are behind the table of contents of this document. While we have tried to make
this document fit your needs, we are interested in your suggestions for improving it and urge you to
complete and return a reader comment card.
If the reader comment cards have been removed from this document, please send your comments to:
AT&T
Technical Publications Department
Room 31c32
11900 North Pecos Street
Denver, Colorado 80234 
						

							xxviABOUT THIS DOCUMENT 
						

							INTRODUCTION1-3
ISDN is a collection of international recommendations that are evolving toward adoption as a CCITT
telecommunications standard. These recommendations are based on the following objectives:
1.To provide the user with end-to-end digital connectivity (which in theory will be independent of
the network provider)
2.To use the end-to-end digital connections as shared (integrated) facilities, thus permitting the same
channel to be used alternately for voice, data, or imagery/video
3.
To permit users access to these new services by a limited set of multipurpose customer interfaces
(each interface being CCITT approved)
The goal is to provide the full set of ISDN services and features on digital customer-premises switches,
digital COs, and to provide these services end-to-end through the public digital network.
The CCITT ISDN recommendations define two functionally different types of communication interfaces
known as the ISDN primary rate interface (ISDN-PRI) and the ISDN basic rate interface (ISDN-BRI).
ISDN-PRI (23B + 1d) recommendations (like DS1) are associated with trunk access, while ISDN-BRI½
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(2B + 1D) recommendations are associated with line (or user terminal) access.
Initially, the CCITT recommendations were identified by their standardization committee as the I
series documents (I.412, I.431, I.441, and I.451). Later, another CCITT development committee used
the I-series documents to develop another series of documents called the “Q” series (Q.921 or Q.931).
Recommendations are designed to be compatible with the Open Systems Interconnection (OSI) 7-layer
model. Both ISDN-PRI and ISDN-BRI include recommendations for layers 1, 2, and 3.
Recommendations for the PRI are similar in function but not identical to those for the BRI. The BRI
and the PRI are compared as follows.
Layer 1
PRI defines functions provided by the physical layer. It requires use of a DS1 and
is based on recommendations I.211, I.412, and I.431. These layer 1 functions
include the physical connector, the creation of the bit stream by multiplexing the
information B-channels and signaling D-channel, the orderly sharing of the
D-channel, timing, synchronization, framing, and line coding.
Layer 2
PRI defines the signaling-channel (data-link) protocol (that is, the envelope). This
layer includes the LAPD protocol (the focus of the Q.921 recommendations). The
LAPD protocol permits many logical links to be multiplexed into one D-channel.
It also provides flow control and error recovery for each logical link.
Layer 3
PRI defines the network-layer protocol (that is, the message), which consists of the
Q.931 recommendations. It provides the methods (messages) to establish, maintain,
and terminate network connections between communicating ISDN applications.
The message set includes over 200 messages, which provide many services/features
that are not available without ISDN. Some of these include:½
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lCall establishment messages (alerting, call proceeding, connect, setup)
Call information phase messages (resume, suspend)
Call disestablishment messages (disconnect, release)
Miscellaneous messages
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							1-4INTRODUCTION
The BRI terminates at a subscriber’s residence or office. There, it connects either to an ISDN
compatible terminal or to a conventional terminal via a terminal adapter. The BRI channel structure
consists of a 2B + 1D format. Each B or bearer channel provides a 64K-bps information channel. Each
D-channel provides a 16K-bps signaling channel.
NOTE: Specific descriptions for BRI layers 1, 2, and 3 are not included here. Another document
that fully describes ISDN-BRI architecture, specific administration requirements, and service
provisioning is being developed. (Refer to ISDN-BRI Reference Manual (555-025-102) for more
information.)
When connecting customer-premises switches to the public network, consider the features and services
supported on each end of the connection. At the time of this publication, the AT&T public network
supported the following services:½
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lACCUNET® Switched Digital Service½
MEGACOM®
MEGACOM 800
Call-by-call (CBC) Service Selection
Automatic number identification (ANI)
Software-Defined Network (SDN)½
System 85 R2V4 and Generic 1 supports ISDN-PRI but not ISDN-BRI. However, System 85 R2V4 uses
the line-side digital communications protocol (DCP) to provide end-to-end digital connectivity. The
DCP channel structure consists of 2I + 1S channel format. Each I-channel provides a 64K-bps
information (voice/data) channel, while the S-channel provides an 8K-bps signaling channel. The DCP
is similar to ISDN-BRI, both in structure and in function. The DCP was AT&T’s early attempt to offer½
½
(what at that time was) the evolving BRI standard. Figure 1-1, System 85 R2V4 ISDN Configuration,
shows various trunk-side and line-side connections to a System 85 R2V4.
Generic 1 (R1V5) and Generic 2 provide a signaling method called nonfacility-associated signaling
(NFAS). NFAS allows a D-channel on one PRI facility (sometimes called a PRI pipe) to provide
signaling for B-channels on this same and other PRI pipes. On a point-to-point basis, all B-channels
controlled by a D-channel (called a signaling group in Generic 1 and a D-channel group in Generic 2)
must be administered in the same order so the sequence of channel IDs match (that is, the channel IDs
of the terminating ISDN facility must match the channel IDs of the originating facility). For example, if
two DS1s connect a Generic 1 to a Generic 2 and the Generic 1 lists B-channels 1-23 of the first facility
followed by B-channels 1-11 of the second facility in a NFAS signaling group, the Generic 2 must also
list in the same order B-channels 1-23 of the first facility followed by B-channels 1-11 of the second
facility in its NFAS D-channel group.
Without administering NFAS for a trunk (B-channel), the Interface Identifier octet of the channel-ID IE
may be omitted for calls made on that trunk. For example, if an ANN35 is not administered for NFAS,
it is a 23B + 1D interface but no channel ID is sent on the D-channel messages for those trunks. If,
however, this same interface is administered for NFAS and the D-channel controls the B-channels on the
same board, it is still a 23B + 1D board but now the channel ID is sent.½
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ADDENDUM 1 (December 1990) to 555-025-101, Issue 4