MAINTENANCE
MAINTENANCE
The primary maintenance objective is to detect, report, and clear troubles as quickly as possible with minimum disruption to normal service. Periodic system
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.
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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.
