ATT System 25 Maintenance Manual

							CLEARING USER-REPORTED TROUBLES
6.
7.
8.
9.
10.
11.
12.
13.
14.If +7 volts are not present, the ADU is receiving insufficient power
from the data terminal and must be locally powered.
lf ADU is powered from local transformer, check to be sure a 3-pair
or 2-pair modular cord is connected between the transformer and the
ADU.
Using a 4-pair modular jack breakout box, check to be sure that the
ac voltage between pins 7 and 8 is approximately 14 volts under load
or about 28 volts for an open circuit.
Even with alternate power, the data terminal needs to deliver at least
3 volts on pin 20 (DTR signal).
Check the data terminal settings that have been administered at the
SAT to be sure the administered settings match those of the data
terminal. Settings should be for 8 bits, no parity with 0 in the parity
bit. Check baud rate settings. Even if terminal accommodates auto
baud rate, administered settings must include baud rate.
If data port is administered for “long break” disconnects, check to be
sure breaks from the terminal are at least 2 seconds. If they are not,
or if the break length cannot be determined, insert a device with a
disconnect button in the line and enter 2-second breaks.
Check wiring.
If none of the preceding procedures correct the terminal troubles,
change the ADU.
if the problems persist, replace the Data Line CP.
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							CLEARING USER-REPORTED TROUBLES
Multiple or Undiagnosable Troubles
Symptoms:
Red LED is lighted on all port CPs. SAT displays this message:
“FAIL:
CPU:ARCHANGEL INSANE:CHECK ZTN85:
TERMINATOR?”.
Procedures:
1.Check the TDM bus terminator card.
Note: The ZTN81 Memory CP provides built-in bus termination
circuitry for one end of the bus, and the TDM bus
termination card is used to terminate the other end.
2.Reseat the Call Processor, Memory, and Service CPs (see “Reseating
and Replacing Circuit Packs”in Section 8). Check the frontplane
connector cable between the Call Processor and Memory CPs.
3.If troubles persist, replace units in this order: TDM bus terminator
card; Service Circuit; frontplane connector; Memory CP; Call
Processor CP.Recheck the system after each unit has been
replaced to see if the trouble clears.
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							CLEARING USER-REPORTED TROUBLES
Symptoms:
Red LED is lighted on several port CPs.
Procedures:
1.Check power supply to be sure it is providing correct voltages (see
“Power Supply Trouble” in Section 8).
2.Check the frontplane connector, the Memory and Call Processor CPs,
and replace any faulty units.
3.Reseat any CPs on which the red LED is still lighted. Replace any
CPs on which the red LED is still lighted.
4.If troubles persist, check the backplane for signs of shorts or other
troubles. A port CP with trouble may be providing a logic “1” or “0”
onto the backplane causing other port CPs to experience trouble also.
In multiple cabinet systems, move suspect CPs to another cabinet to
help identify CP or backplane trouble (see “Backplane and Cabinet
Trouble” in Section 8).
Symptoms:
Undiagnosable or unfixable troubles.
Procedures:
1.
2.
3.
4.
Force a cold restart of the system from the SAT (see “Restarting the
System” in Section 8).
Read in the latest tape containing system translations (see Section 7
“Operating the Digital Tape Unit”).
Focus your attention on the Call Processor and Memory CPs. Check
the LEDs on these CPs. Check the error log for relevant messages.
If troubles persist, follow established escalation procedures.
9-14 
						

							REFERENCE DOCUMENTATION
The following System 25 documents are available for reference. A brief
description of each manual is provided. Manuals not specified for Release 1
Version 2 (R1V2) cover both R1V1 and R1V2.
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lAdministration Manual
Administration Manual for R1V2
Advanced Administration Manual for R1V2
An Introduction to AT&T System 25
Implementation Manual
Implementation Manual for R1V2
Installation and Test Manual
Maintenance Manual
New Capabilities Manual for R1V2
Planning Manual
Reference Manual
Terminal Operations Manual555-500-500
555-520-500
555-520-510
555-520-021
555-500-650
555-520-650
555-520-100
555-520-105
555-520-205
555-520-600
555-520-200
555-520-710
User Guides
—Data Features User Guide555-520-704
—
Direct Trunk Attendant Console User Guide555-520-701
—
Multiline Voice Terminal User Guide555-520-703
—
Single-Line Voice Terminal User Guide555-520-702
Switched Loop Attendant Console User Guide555-520-706
—
Administration Manual or Administration Manual
for R1V2
Provides the information necessary to initialize a system and to perform
ongoing 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.
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							REFERENCE DOCUMENTATION
Advanced Administration Manual for R1V2
Provides information for administrative procedures not covered in the basic
Administration Manual.Advanced administration allows the System
Administrator to make changes in voice and data terminal assignments, call
group coverage, action codes, and other system features such as Automatic
Route Selection (ARS).
An Introduction to AT&T System 25
Provides an introduction to System 25 features and services. The emphasis
is on how System 25 helps solve information management, productivity, and
cost control problems.
Implementation Manual or Implementation
Manual for R1V2
Describes how to plan the system’s operating configuration. 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 conjunction with the Administration Manual to initialize the system.
The Implementation Manual and associated forms are packaged together in
the Administration Records Binder.
Installation and Test Manual
Provides step-by-step procedures for installing System 25 and associated
equipment. Includes procedures for testing equipment and trunks and for
making additions and changes to the system.
10-2 
						

							REFERENCE DOCUMENTATION
Maintenance Manual
Provides a detailed description of system operation and procedures for
isolating and clearing customer affecting faults.
New Capabilities Manual for R1V2
Describes the System 25 Release 1 Version 2 (R1V2) features that were not
included in Release 1 Version 1 (R1V1 ). In addition, R1V1 features that have
been enhanced for R1V2 and new R1V2 hardware are covered.
Planning Manual
The document is a presale workbook used by the Account Team and
customer to define a set of orderable equipment that meets the customer’s
specific requirements.This workbook, when completed, may be used in
conjunction with the Quick-Quote Price Estimator or the DOSS Configurator
to obtain a price estimate or formal quote or to place an order.
10-3 
						

							REFERENCE DOCUMENTATION
Reference Manual
This document is the system’s principal technical reference. It provides
reference material for sales support, system configuration and operation, and
for the syustem technician. It contains a comprehensive description of the
system, emphasizing features, components and overall capabilities and
capacities. This reference manual is divided into 10 sections:
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lSECTION 1—OVERVIEW
SECTION 2—FEATURES AND SERVICES
SECTION 3—FUNCTIONAL DESCRIPTION
SECTION 4—HARDWARE DESCRIPTION
SECTION 5—TECHNICAL SPECIFICATIONS
SECTION 6—ENVIRONMENTAL REQUIREMENTS
SECTION 7—PARTS INFORMATION
SECTION 8—REFERENCE DOCUMENTATION
SECTION 9—GLOSSARY
SECTION 10—INDEX.
Terminal Operations Manual
This manual is designed to help the System Administrator better understand
System 25 voice terminal and data terminal operation. This manual contains
all operating procedures provided in the various User Guides and provides
additional explanatory material as well.
User Guides (700 Series)
These guides specify operating procedures for System 25 voice and data
terminals users.
10-4 
						

							ABBREVIATIONS AND ACRONYMS
ADUAsynchronous Data Unit
ARSAutomatic Route Selection
ASCIIAmerican Standard Code for Information Interchange
BLF
BPS
CCS
CCSA
COS
DCE
DDC
DDD
DID
DGC
DTAC
DTE
DTMF
DXS
EIA
ETU
Busy Lamp Field
Bits Per Second
Hundred Call Seconds
Common Control Switching Arrangement
Class of Service
Data Communications Equipment
Data Dial Code
Direct Distance Dialing
Direct Inward Dialing
Direct Group Call
Direct Trunk Attendant Console
Data Terminal Equipment
Dual-Tone Multifrequency
Direct Extension Selector
Electronics Industries Association
Emergency Transfer Unit
11-1 
						

							ABBREVIATIONS AND ACRONYMS
FNPAForeign Numbering Plan Area
FRLFacility Restriction Level
FXForeign Exchange
HNPA
LDN
LED
MET
MOH
NAU
NEU
NPA
OPS
PDC
PDS
Home Numbering Plan Area
Listed Directory Number
Light-Emitting Diode
Multibutton Electronic Telephone
Music-on-Hold
Network Access Unit
Network Extension Unit
Number Plan Area
Off-Premises Station
Personal Dial Code
Premises Distribution System
11-2 
						

							ABBREVIATIONS AND ACRONYMS
RAMRandom Access Memory
RNXPrivate Network Office Code
ROMRead Only Memory
SATSystem Administration Terminal
SIPStation Interconnect Panel
SLACSwitched Loop Attendant Console
SMDRStation Message Detail Recording
TAETrunk Access Equipment
TCTechnical Consultant
VTVoice Terminal
WATSWide Area Telecommunications Service
11-3