AT&T DEFINITY 7300 series Manual de Instruções descarregar pdf (Página 177)

MAINTENANCE

The primary maintenance objective is to detect, report, and clear troubles as

quickly as possible with minimum disruption to normal service. Periodic

system self-tests, automatic software diagnostic programs, and fault

detection hardware are several of the maintenance tools used to achieve this

objective. Most troubles in System 25 can be isolated to a replaceable unit.

The System 25 hardware is maintained as a group of independent units (that

is, maintenance objects). Each object is normally a separately replaceable

unit. Examples include circuit packs (CPs), power supplies, fan assemblies,

the Digital Tape Unit, AC Power Distribution Unit, voice terminals, lines, and

trunks.

● System-Detected Errors

● User-Reported Troubles.

For system-detected errors, a light-emitting diode (LED) on the attendant

console automatically lights if the error qualifies as an “alarm. ” This is a

serious error. Most alarms are also indicated by LEDs on system CPs.

User-reported troubles usually result from service problems at individual

voice and data terminals and are often related to alarmed conditions.

Error records and alarms are retired either automatically or manually. After a

trouble or error has been cleared, the system retests the previously faulty

area within a variable time interval. When the error is no longer detected, the

error message and the alarm, if applicable, are retired. By entering

commands at the SAT, maintenance personnel can retire error records and

alarms manually after a problem has been fixed. Also, error records can be

accessed and listed, and some alarms can be removed through the SAT.

However, certain alarms must be cleared manually. After the error messages

have been removed from the error tables, the Attendant Alarm LED (and red

CP LEDs) will go dark unless the trouble recurs.

Note: Information contained in this part applies to the AT&T

System 25 RI VI, R1V2, R2V1 and R3V1. However, in all

cases except in the description of CP LEDs, the

CPU/Memory CP (ZTN129 [R2V1] or ZTN130 [R3]) is

referenced rather than the Call Processor CP and Memory

CP used in RIV1 and R1V2.

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AT&T DEFINITY 7300 series Manual de Instruções Página 177