Avaya S8700 Maintenance Manual page 2243

SYNC (Port-Network Synchronization)
9. Use display synchronization to find out what references, if any, are
administered. Use status synchronization to find out whether
synchronization is enabled.
10. For a high- or critical-reliability system, the set tone-clock command can
be used to interchange IPSI circuit packs' Tone-Clock circuits or Tone
Clock circuit packs. If slips go away, then replace the previously active
Tone-Clock.
11. Use list fiber-links to determine the EIs on the active PN and the EIs
associated with the slave PN. If the switch does not have duplication, the
EIs are all on the active PN.
12. Replace the circuit packs one at a time, and wait at least one hour to
determine if the problem has gone away. This procedure is disruptive and
should be done after hours if possible.
An alternative to replacing the EI and SNI in systems where the PNC is
duplicated, is to perform a PNC interchange via reset pnc interchange. If
the problem goes away, either the EI or the SNI on the previously active
PNC should be replaced. Replace one at a time and make that PNC active
again to determine whether the problem is fixed.
An alternative to replacing the Tone-Clock circuit pack in systems where
the Tone-Clocks are duplicated, is to run the set tone-clock command to
interchange Tone-Clocks. If the problem goes away, the previously active
Tone-Clock should be replaced.
Also, before replacing an SNC circuit pack, the set switch-node-clock
command can be used if SNCs are duplicated in the carrier. If the problem
goes away, the previously active SNC should be replaced.
13. Replace the circuit packs one at a time and wait at least one hour to
determine if the problem has gone away. This procedure is disruptive and
should be done after hours if possible.
An alternative to replacing the EI and SNI in systems where the PNC is
duplicated, is to perform a PNC interchange via reset pnc interchange. If
the problem goes away, either the EI or the SNI on the previously active
PNC should be replaced. Replace one at a time and make that PNC active
again to determine whether the problem is fixed.
An alternative to replacing the Tone-Clock circuit pack in systems where
the Tone-Clocks are duplicated, is to run the set tone-clock command to
interchange Tone-Clocks. If the problem goes away, the previously active
Tone-Clock should be replaced.
Also, before replacing an SNC circuit pack, the set switch-node-clock
command can be used if SNCs are duplicated in the carrier. If the problem
goes away, the previously active SNC should be replaced.
555-233-143 Issue 1 May 2002 8-1521