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TONE-BD (Tone-Clock Circuit Pack)
Issue 4 May 2002 10-1795 555-233-123
2. If the error is not corrected by resolving errors found in step 1, the
Tone-Clock circuit pack should be replaced. See the preceding
section,
‘‘How to Replace a 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 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 pack 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
pack (the t/c selector).
■
For a PPN, the t/c selector is the DUPINT circuit pack on
carrier A.
■
For an EPN, the t/c selector is the active EXP-INTF circuit
pack that is connected to the PPN. This is EXP-INTF 2A01 or
2B02 for EPN1 and 3A01 or 3B02 for EPN2.
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 SPE interchange for PPN problem, or an
EXP-INTF link switch for EPN problem, In order to determine
whether an interchange has occurred since the TONE-BD error,
examine the display initcauses log for SPE interchanges, and
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
‘‘Replacing Defective SPE Circuit Packs’’ in Chapter 6, ‘‘Reliability
Systems: A Maintenance Aid’’ for the DUPINT circuit pack, or in the
EXP-INTF section of this chapter 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 pack. 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. Refer to the
TDM-BUS section.
5. If the problem persists, follow normal escalation procedures.