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TONE-BD (Tone-Clock Circuit Pack)
Issue 4 May 2002 10-1791 555-233-123
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If the interchange was not successful, the standby Tone-Clock
circuit pack may be defective. In particular, if the error message
“must use override” is displayed, fix the standby Tone-Clock circuit
pack before attempting to replace the active one.
3. If the Tone-Clock circuit pack to be replaced is in the PPN, it is
recommended, but not required, that the SPE carrier containing it be
locked in standby mode by executing an interchange if necessary, and
locking the SPE-Select switches. This protects you from disrupting service
in case of inadvertent errors in replacing the circuit pack.
NOTE:
If the SPE-Select switches are locked, be sure to release them at the
conclusion of the replacement procedure.
4. Pull out the defective Tone-Clock circuit pack. No calls should be affected.
If this is a TN2182 circuit pack, some ETR-PTs may be in use and removal
of the pack will affect some individual users. It may be less disruptive to
busyout the standby TN2182 before removing it.
5. Insert a new Tone-Clock circuit pack of the appropriate code in the same
slot where the defective Tone-Clock circuit pack was removed.
6. Test the new Tone-Clock circuit pack via the test tone-clock PC command
to make sure it is functioning properly. If the Tone-Clock circuit pack is
being replaced due to loss of clocks, the Clock Health Inquiry (#46) will still
report a failure, proceed with the next step.
7. To verify that the new Tone-Clock circuit pack is able to generate clocks for
the system, switch to the new Tone-Clock circuit pack via the set
tone-clock PC override command, and execute test tone-clock PC. (In a
PPN, the SPE-Select switches must be in the auto position.)
!
CAUTION:
If the new Tone-Clock circuit pack is not able to generate system
clocks, this procedure becomes destructive. The system will detect a
loss of clock and recover accordingly.
In this case if the Tone-Clock circuit pack being replaced is in the PPN the
system will perform a reset system 2 (cold 2 restart) automatically. If the
Tone-Clock circuit pack being replaced is in an EPN, the system will reset
the EPN (EPN cold restart). After either type of restart, the faulty
Tone-Clock circuit pack will be in standby mode. Since the replacement
procedure was not successful, follow normal escalation procedures. If the
new Tone-Clock circuit pack is able to generate system clocks, there
will be no system disruption.
8. Place several phone calls.
9. After replacing a Tone-Clock circuit pack in an SPE, if the SPE lock
switches were set during the procedure, they should be released.
Additionally, after repairs in an EPN, the set tone-clock PC command
should be used if required to make the preferred Tone-Clock circuit pack
active.