Avaya Definity SI Maintenance Manual page 1554

Maintenance Object Repair Procedures
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b. On a system in which the EPN containing the suspect Tone-Clock
!
c. On a standard system in which the PPN contains the suspect
!
10-768 Issue 4 May 2002
WARNING:
If the defective Tone-Clock circuit pack is left as the Standby
Tone-Clock, then a scheduled Tone-Clock switch causes the same
Expansion Link(s) to go out-of-service again.
circuit pack is out-of-service:
Replace the Active Tone-Clock circuit pack on this network. In a
High or Critical Reliability system, the Active Tone-Clock is the
Tone-Clock circuit pack whose yellow LED is: 1) blinking and 2)
blinking slower if both Tone-Clocks have blinking yellow LEDs. If the
Expansion Interface Link(s) comes up after replacing this
Tone-Clock circuit pack, then this Tone-Clock circuit pack should be
replaced as soon as possible. See Warning.
WARNING:
If the defective Tone-Clock circuit pack is left as the Standby
Tone-Clock, then a scheduled Tone-Clock switch causes the same
EPN to go out-of-service again.
If replacing the Active Tone-Clock did not bring up the Expansion
Interface Link(s), then this Tone-Clock circuit pack is not the source
of the problem.
Tone-Clock circuit pack:
Replace the PPN Tone-Clock circuit pack at a time when bringing
down the system is most convenient to the customer.
WARNING:
Replacing the PPN Tone-Clock circuit pack stops call processing on
that network and also brings down stable calls. This action eventually
causes a Reset System 2 (Cold 2 restart).
If replacing the Tone-Clock circuit pack restores the Expansion
Interface Link(s), then the Tone-Clock circuit pack is defective and
should be replaced. Otherwise, the problem is not with the PPN
Tone-Clock circuit pack.
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