Maintenance-Object Repair Procedures
555-233-143
8-1668 Issue 1 May 2002
Port Networks with Two Tone-Clock
Circuit Packs
Notes:
1. Use the list cabinet command to determine the port network’s number of
the cabinet and carrier containing the Tone-Clock circuit pack to be
replaced. If both of an EPN’s Tone-Clock circuit packs need to be
replaced, first replace and test the one in standby mode by either:
■ Entering status port-network to display its status
■ Making sure its amber LED is off
Make sure it is healthy and active before replacing the second one.
2. If the Tone-Clock circuit pack to be replaced is active, then switch to the
other Tone-Clock circuit pack by doing the following:
■ set tone-clock UUC — Where UUC is the standby Tone-Clock
circuit pack.
NOTE:
For a critical-reliability system (duplicated PNC), the system
generally expects an EPN to have its “preferred” Tone-Clock
circuit pack active. For the first EPN in a given cabinet, this is
carrier A. For a second EPN in the cabinet, this is carrier E.
■ status system — Verify the Tone-Clock circuit pack switched to the
other Tone-Clock circuit pack or check the LEDs. The amber LED of
the new standby Tone-Clock circuit pack should be off (provided
maintenance is not running on it) and the amber LED of the active
Tone-Clock circuit pack should be blinking.
■ 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. 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.
4. Insert a new Tone-Clock circuit pack of the appropriate code in the same
slot where the defective Tone-Clock circuit pack was removed.
5. Test the new Tone-Clock circuit pack via the test tone-clock UUC long
command to make sure it is functioning properly. If the Tone-Clock circuit
pack is being replaced due to loss of c locks, the Clock Health Inquiry (#46)
will still report a failure, proceed with the next step.
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