Maintenance-Object Repair Procedures
555-233-143
8-1674 Issue 1 May 2002
2. If the error is not corrected by resolving errors found in step 1, the
IPSI or Tone-Clock circuit pack should be replaced. See ‘‘Replacing
the IPSI or Tone-Clock Circuit Pack’’.
NOTE:
Replacing the circuit pack and retesting it with the test
tone-clock command is not adequate to retire this alarm and
return the IPSI or Tone-Clock circuit pack to full service; the
Clock Health Inquiry test (#46) will continue to fail. Because
the ability to generate clocks was considered lost, once any
repairs have been made it is necessary to execute the set
tone-clock PC override command, forcing the circuit pack to
become active. If the problem has not actually been
corrected, this action may cause a disruption in service for
active digital facilities users.
3. If error 2305 or 3848 persists, all clock signals from the indicated
board were lost.
If the reported Tone-Clock circuit is in a port network with duplicated
Tone-Clocks, the problem may lie with the circuit pack responsible
for selecting the active Tone-Clock circuit (the t/c selector). For an
EPN, the t/c selector is the active EXP-INTF circuit pack.
The t/c selector circuit pack of interest is the one which was active at
the time the error was logged. This is the currently active t/c
selector, unless there has been an EXP-INTF link switch for an EPN
problem. In order to determine whether an interchange has
occurred since the TONE-BD error, examine the display initcauses
log for EXP-LNK entries in the hardware error log for expansion link
interchanges.
If the t/c selector circuit pack was not replaced as part of the
previous step, replace it now. Follow procedures described in
‘‘EXP-INTF (Expansion Interface Circuit Pack)’’ on page 8-762 for
the Expansion Interface.
4. If the error has not been corrected at this point, there is a problem
with the TDM bus within the port network containing the reported
Tone-Clock circuit. This may include TDM bus intercarrier cables,
bus terminators, bent pins on the backplane, and errors on any
circuit pack plugged into the same port network. See ‘‘TDM-BUS
(TDM Bus)’’ on page 8-1588.
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