Reliability Systems: A Maintenance Aid
555-233-123
6-22 Issue 4 May 2002
Replacing Defective SPE Circuit Packs
Determine that software is running by looking at the G3MT and verifying that it
does not have either the “SPE DOWN MODE” or the “Duplication Interface -
Processing Element Communication Down” message displayed.
Software Not Running
If system software is not running or if it stops running at any point during this
procedure, the suggested order of Processor Complex circuit packs to replace in
an attempt to fix the SPE down problem is:
■ Processor circuit pack (TN2404/TN790)
■ Network Control circuit Pack (TN777[B])
■ Packet Control circuit pack (TN778)
■ Duplication Interface circuit pack (TN772)
■ Processor Interface circuit pack (TN765)
Software Running
If system software is running, determine which SPE is the Standby SPE by
issuing the status system command from the G3MT terminal. Look at the SPE
and MODE fields in the upper left corner of the form to determine which SPE (A or
B) is the Active SPE; it is labeled as “active.” The other SPE is the Standby SPE
and is labeled as either “standby,” “maint,” or “down.”
Follow the “Circuit Pack Replacement Procedure” described later for each
Standby SPE circuit pack to be replaced. Continue with this procedure as follows.
1. If alarms are against the Active SHDW-CIR, Active DUPINT, or
SHDW-LNK, replace the Duplication Interface circuit pack. Proceed to the
‘‘Handling SHDW-CIR and SHDW-LNK Alarms in the Active SPE’’ or
‘‘Handling DUPINT Alarms in the Active SPE’’ sections as applicable.
2. If these sections do not need to be referenced, proceed to the ‘‘Circuit Pack
Replacement Procedure’’ section.
The rest of this section describes how the system behaves when there are faulty
circuit packs in the SPEs and is meant to be informative rather than part of the
general procedure of replacing SPE circuit packs.
NOTE:
When circuit packs other than the Duplication Interface circuit pack in
the Active SPE are defective, the SPE containing the more severely
defective circuit packs is usually in the Standby SPE.
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