Routine Maintenance Procedures
555-233-123
5-4 Issue 4 May 2002
EPN Control Circuit Packs
Control circuit packs are unseated, reseated, replaced, and tested in the same
way as Port circuit packs. See ‘‘Handling Control Circuit Packs’’ in this chapter.
Note the special precautions required when handling the TN776 and TN570
Expansion Interface (EXP-INTF) circuit packs and the EPN TN768 and TN780
Tone-Clock circuit packs.
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 Expansion Interface Link. Use 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. Use the status system
command. If the Tone-Clock is shown as Active, use the set tone-clock PC
command to make the current Standby Tone-Clock the Active one.
TN2404/TN790 processor circuit pack
Processor Circuit Pack (Memory)
Unless you are upgrading memory, the TN2404/TN790 must have the same
number of SIMMs as the replaced circuit pack. You must obtain a license file each
time you replace a processor circuit pack.
!
CAUTION:
Be sure to use an Avaya-provided SIMM. Other brands may have
incompatible edge connectors and could produce unpredictable results.
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