ATT System 25 Reference Manual

							PARTS INFORMATION
COMCODE PECDESCRIPTIONAPPARATUS CODE
527840102  2614-100AT&T STARLAN NETWORK
Network Access Unit (NAU)
845412956  No PECCPU/MEM*
Interconnect Cable
845416379  P/O 6250-031  Fans (2)
P/O 62501
845416635  P/O 6250-031  Address Plug*
P/O 62501
845875772  P/O 6250-031  SLAC Graphics*
P/O 62525A
Overlays (2)WP90677 L1
* Not Available.
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							REFERENCE DOCUMENTATION
Basic Manuals
Software Packages
Integrated Solution Documents
Descriptions of Basic Manuals8-1
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8-2
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							REFERENCE DOCUMENTATION
REFERENCE DOCUMENTATION
System 25 is supported by a complete set of basic and supplementary documentation and
optional software.This section provides a brief summary of the available material for
Release 3 (R3).
Basic Manuals
l An Introduction to System 25                                                                                      
l R3 Administration Manual                                                                    
l R3 Implementation Manual                                                                  
l Installation and Maintenance Manual                                                              
l R3 Reference Manual                                                                       
l R3 Terminal Operations Manual                                                                       
l User Guides
Data Features User Guide                                                                                
Direct Trunk Attendant Console User Guide
Multiline Terminal User Guide                                         
Single-Line Terminal User Guide                                            
Switched Loop Attendant Console User Guide            
l Remote Access Wallet Card                                                          
555-540-021
555-540-500
555-540-650
555-540-103
555-540-200
555-540-710
555-540-704
555-540-701
555-540-703
555-540-702
555-540-706
555-540-717
Software Packages
To expand System 25’s communications and networking capabilities, AT&T offers the
following optional software packages:
l R3 Advanced Administration Software Package (MS-DOS)                                        
l R3 Advanced Administration Software Package (UNIX)                                             
l Call Management System (Includes next four documents)                                
Call Management System Agent Card
Call Management System Installation & Startup Guide
Call Management System Planning Guide
Call Management System System Manual
l Communications Access Manager Software Package                                
l STARLAN NETWORK ACCESS Software Package
PEC 1203-030,
Release 3
PEC 1203-031,
Release 3
PEC 1207-030
PEC 1020-S91
PEC 1020-S90
8-1 
						

							REFERENCE DOCUMENTATION
Integrated
l Integrated
l Integrated
l Integrated
l AT&T Call
Solution Documents
Solution User Guide                                                                                                 555-540-715
Solution Instructor’s Guide555-540-717
Solution Student Guide      555-540-718
Accounting System Reports Guide                                                  
775-413
Descriptions of Basic Manuals
An Introduction to System 25
Provides a summary of System 25 features, services, and equipment in an attractive full-
color format with many pictures.The emphasis is on how System 25 helps solve information
management, productivity, and cost control problems.
Administration Manual
Provides the information necessary to initialize a system and to perform on-going system
administration.Explains the operation of the System Administration Terminal, the Digital
Tape Unit, and the commands that allow the System Administrator to make changes and
additions.
Implementation Manual
Describes how to plan the operating configuration of the system. Explains how to determine
customer needs and how to convert these needs into a system configuration plan. This plan
is recorded on accompanying forms that are used in
Manual to initialize the system. The Implementation
packaged together in the Administration Records Binder
Installation And Maintenance Manualconjunction with the Administration
Manual and associated forms are
Provides step-by-step procedures for installing System 25 and associated equipment and
procedures for isolating and clearing customer affecting faults. Includes procedures for
testing equipment and trunks and for making additions and changes to the system.
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							REFERENCE DOCUMENTATION
Reference Manual
The principal technical reference for users of System 25. It provides reference material for
sales support, system configuration and operation and for the system technician. It contains
a comprehensive description of the system, emphasizing features, components and overall
capabilities and capacities.
Terminal Operations Manual
Designed to help the System Administrator better understand System 25 voice terminal and
data terminal operation.This manual contains the operating procedures provided in the
various User Guides and provides additional explanatory material as well.
User Guides (700 Series)
Contain step-by-step operating procedures for System 25 attendants and users of voice and
data terminals.
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							GLOSSARY
GLOSSARY
This section provides explanations for acronyms and definitions of terms used in this
manual.
ADU: (Asynchronous Data Unit)
ARS: (Automatic Route Selection)
ASCII: (American Standard Code for Information Exchange)
Administer
To access and change the parameters associated with the services or features of the
system.
Analog Data Endpoint
Data endpoints with customer provided built-in or stand-alone modems. They do not
require the use of data modules (asynchronous data units) and are addressed similar
to any voice terminal by PDC. These end-points connect to tip/ring type circuit pack
ports.
Analog Voice Terminals
Voice terminals served by a single-line tip and ring circuit (2500 series and 7101A
voice terminals or industry standard Dual Tone Multifrequency equivalent).
Appearance
See Call Appearance.
Asynchronous Data Transmission
A scheme for transmitting data where each character is preceded by a start bit and
followed by a stop bit, thus permitting data elements to occur at irregular intervals.
This type transmission is advantageous when transmission is not regular (characters
typed at a keyboard).
Asynchronous Data Unit (ADU)
A data communications equipment (DCE) type device
between RS-232C equipment and the digital switch via
Pack (TN-726).
that allows direct connection
ports on the Data Line Circuit
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							GLOSSARY
Attendant
The operator of the attendant console.
Attendant Console
l Direct Trunk or Switched Loop Attendant Console: An electronic call-
handling position with pushbutton control. Used by attendants to answer and
place calls and to manage and monitor some system operations.
l Direct Extension Selector Console: Provides the attendant with a visual
indication of the active or idle status of extension numbers assigned in the
system. Also allows the attendant to extend calls to system users by
operation of appropriate Hundreds Group Select buttons and associated
Direct Extension Selection (DXS) buttons.
Auxiliary Equipment
l Dictation Equipment
l Delay Announcement Devices
l External Alerting Devices (external alerts)
l Music-On-Hold Equipment
l Paging Equipment
Auxiliary Trunk
A trunk circuit used to connect auxiliary equipment to the switch, for example, music
or dictation equipment.
B8ZS (Bipolar 8 Zero Suppression)
Bipolar 8 Zero Suppression (B8ZS) line coding format monitors the transmit bit
stream for a string of eight zeros. It uses a bipolar violation scheme to meet the
ones-density requirement.B8ZS is required for transmitting unrestricted digital data.
BLF: (Busy Lamp Field)
BPS: (Bits Per Second)
Bit (Binary Digit)
One unit of information in binary notation (having two possible states or values, zero
or one).
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							GLOSSARY
Bridge (Bridging)
The sharing of the same extension or line by two or more voice terminals.
Buffer
A circuit or component that isolates one electrical circuit from another. Typically, a
buffer holds data from one circuit or process until another circuit or process is ready
to accept the data.
Bus
A multi-conductor electrical path used to transfer information over a common
connection from any of several sources to any of several destinations.
Bus, Time Division Multiplex
See Time Division Multiplex Bus.
CAM: (Communications Access Manager)
CAS: (Call Accounting System)
CMS: (Call Management System)
CCS (Hundred Call Seconds)
A traffic-measuring unit that expresses the load of one or more traffic-handling
devices. A device used for 1 hour without interruption generates 36 CCS which
equals 1 erlang (see Erlang).
Call Appearance, Voice Terminal
A button (for example, System Access, Bridged Access, Loop, DSS, Flex DSS, or
Auto Intercom) used to place outgoing calls, receive incoming calls, or hold calls.
Two LEDs next to the button show the status of the call appearance or status of the
call.
Central Office (CO)
The location housing telephone switching equipment that provides local telephone
service and access to toll facilities for long-distance calling.
Central Office Exchanges
The first three digits of a 7-digit public network telephone number. These codes are
numbered from 200 through 999 and are sometimes referred to as NNXs.
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							GLOSSARY
Central Office Trunk
A telecommunications channel that provides access from the system to the public
network through the local central office.
Channel
A communications path for transmitting voice and data.
Class of Service (COS)
Parameters used to define voice terminal, data, Remote Access, and trunk port
capabilities and restrictions.
Common Channel Signaling
Common channel signaling is an out-of-band signaling format intended to be a
substitute for conventional robbed bit signaling in DS1 level signals.
Common Control Switching Arrangement (CCSA)
A private telecommunications network using dedicated trunks and a shared switching
center for interconnecting company locations.
Confirmation Tone
Three short bursts of tone followed by silence; indicates that the feature activated,
deactivated, or canceled has been accepted.
Console
See Attendant Console.
Coverage Call
A call that is redirected from the called party’s personal dial code to an alternate
answering position when certain criteria are met.
Coverage Path
The order in which calls are redirected to alternate answering positions.
Coverage Point
The attendant positions (as a group), Direct Group Call (DGC) group, Coverage
Receiver Group, or a voice terminal extension designated as an alternate answering
position in a coverage path.
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							GLOSSARY
Covering User
The person at an alternate answering position who answers a redirected call (the coverage
receiver).
D4 Framing
D4 is the most prevalent framing format found in the T1 environment and is supported by
the D4 series channel banks.
DACS: (Digital Access and Cross-Connect)
DCE: (Data Communications Equipment) DDC: (Data Dial Code)
DDD: (Direct Distance Dialing)
DID: (Direct Inward Dialing)
DGC: (Direct Group Calling)
DMI-BOS (Digital Multiplexed Interface-Bit Oriented Signaling)
See Common Channel Signaling.
DSn
Generally, Digital Signal (DS) level n refers to the logical organization or division of the
bandwidth available on T carriers. DS0 is a single 64 kbps channel. Twenty-four DS0
channels combine to form a DS1 channel. Four DS1 channels combine to form a DS2
channel. Twenty-eight DS1 channels combine to form a DS3 channel.
DTAC: (Direct Trunk Attendant Console)
DTE: (Data Terminal Equipment)
DTU: (Digital Tape Unit)
DTMF: (Dual Tone Multifrequency)
DXS: (Direct Extension Selector)
Data Channel
A communications path between two points used to transmit digital signals.
Data Communications Equipment (DCE)
Refers to a specific RS-232C interface connector configuration. DCE devices are designed
to interface directly (pin-for-pin) to Data Terminal Equipment (DTE). The transmit and
receive pins are reversed from that of a DTE interface. A modem is an example of a DCE
device.
November 1995
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