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...

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...

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...

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.
l
l
l
l
l
l
l
l
l
l
l
l
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...

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...

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...

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:
l
l
l
l
l
l
l
l
l
lSECTION 1—OVERVIEW
SECTION 2—FEATURES AND SERVICES
SECTION 3—FUNCTIONAL DESCRIPTION...

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...

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