DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123 Issue 1
April 1997
Routine Maintenance Procedures
Page5-4TN790 Processor Circuit Pack (Memory)
5

EPN Expansion Interface Circuit Packs

If the system has high or critical reliability, verify that the Expansion Interface to
be unseated or replaced is NOT a part of the Active Expan sion Interface Link.
Issue the status system command. If the Expansion Interface circuit pack is
shown to be a part of the Active Expansion Interface Link, use the set
expansion-link PCSS command to make the current Standby link the Active
one.

EPN Tone-Clock Circuit Packs

If the EPN has redundant Tone-Clock circuit packs, make sure the Tone-Clock to
be unseated or replaced is the Standby circuit pack. Issue the status system
command. If the Tone-Clock is shown as Active, use the set to ne-clock PC
command to make the current Standby Tone-Clock the Active one.
TN790 Processor Circuit Pack (Memory)
Unless upgrading memory, the TN790 must have the same number of SIMMs as
the replaced circuit pack.
!CAUTION:

Be sure to use a Lucent Technologies-provided SIMM. O ther brands may

have incompatible edge connectors and could produce unpredictable

results.

Removing Power
When power is removed, the following features deactivate:
■Attendant Trunk Group Control
■Automatic Call back
■Call Park
■Make Busy for Direct Department Calling (DDC) and Uniform Call
Distribution (UCD)
The procedures for removing power vary depending on the system configuration.
Before performing these activities, refer to the following appropriate procedure.
!WARNING:

Before powering down a cabinet or carrier that contains DEFINITY AUDIX

circuit packs (TN566), first power down the AUDIX unit to avoid damaging

the AUDIX software. Instructions for powering down this unit are in the