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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-602EXP-INTF (Expansion Interface Circuit Pack)
10
Whether or not a link goes down, depends on certain characteristics of the
Expansion Interface circuit packs. An Expansion Interface circuit pack should not
be replaced if the link on which it resides goes down because of a defective
Active Tone-Clock circuit pack. The defective Tone-Clock circuit pack should be
replaced instead. The Expansion Interface circuit packs are more sensitive to a
defective system clock than the rest of the components of the system. Therefore,
testing of the Tone-Clock circuit pack might not reveal a problem.
The symptoms of the problem in which an invalid system clock causes an
Expansion Link to go down are as follows:
1. If the Active PPN Tone-Clock circuit pack is providing an invalid system
clock:
a. The EPN Expansion Interface circuit pack yellow LED blinks
quickly.
(Fiber Out-of-Frame condition).
If the EPN is up, Test #238 fails on this Expansion Interface circuit
pack.
b. The PPN Expansion Interface circuit pack yellow LED blinks slowly.
(In-frame, No Neighbor condition).
Test #237 fails on this Expansion Interface circuit pack, but Test
#238 passes.
2. If the EPN Tone-Clock circuit pack is providing an invalid system clock:
a. The PPN Expansion Interface circuit pack yellow LED blinks quickly
(Fiber Out-of-Frame condition).
Test #238 fails on this Expansion Interface circuit pack.
b. The EPN Expansion Interface circuit pack yellow LED blinks slowly
(In-frame, No Neighbor condition).
If the EPN is in-service, Test #237 fails on this Expansion Interface
circuit pack, but Test #238 passes.
These symptoms can also be the result of other problems (for example, one half
of the fiber being unable to transmit data). If the system exhibits these symptoms,
execute the following procedure:
1. Verify that the EPN stays down for at least one minute.
If the Expansion Interface Link comes back in service after a short time,
without switching the Active Tone-Clock, the problem probably was the
on-line synchronization source became invalid (see SYNC Maintenance
documentation for more information).
However, if the Expansion Interface Link(s) has not come back into
service after one minute, the synchronization source is not the cause of
the problem. Proceed to Step 2.