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EXP-INTF (Expansion Interface Circuit Pack)
Issue 4 May 2002 10-775 555-233-123
n. Error Type 3585 indicates that the EI circuit pack experienced a series of
very short out-of-frame conditions within several minutes. This may
indicate transmission difficulties over the fiber link. If this is a duplex
system, and if no other alarms exist, the system should have switched
away from the fiber link using this EI circuit pack. If this condition ceases,
the warning alarm should be resolved within 15 minutes. In the meantime,
make sure all lightwave transceivers are firmly secured to the back of the
cabinet. Thereafter, if the alarm is not resolved during the next four
15-minute segments, replace the following (the first after the first 15-minute
segment, the second after the second 15-minute segment, and so forth):
1. Lightwave transceiver attached to the EI reporting the alarm
2. Lightwave transceiver on the opposite end of the fiber
3. Expansion Interface board reporting the alarm
4. Expansion Interface board on the opposite end of the fiber
Since the counter is active only due to a transient condition, there is no test
that can be run to clear the counter. However, the counter automatically
decrements by one every five minutes. Once the condition causing the
transient Fibers Out-of-Frame (FOOFs) has been fixed, it will take 15
minutes for the counter to be cleared if the alarm was raised.
o. Error Type 3841 indicates that the EI (TN570 only) has reported a loss of
lock with the backplane system clock.
p. Error Type 3842 indicates that the test that queries the EI (TN570 only) for
the state of the lock to the system clock has failed. This means that a loss
of lock condition is present. A link switch is then attempted, and the alarm
is raised. When both links report this error, the link switch is not attempted
because, in this case, the problem is more likely to occur with the
backplane clock than with the Expansion Interface circuit pack.
q. The counter associated with Error Types 3841 and 3842 is cleared when
the query for the state of the lock-to-system-clock passes. Once the alarm
is raised, this test is run every five minutes. However, the test is not part of
any sequence that can be run on demand.
r. Error Type 10000 is a report from the EI circuit pack that its internal data
has become corrupted. The EI circuit pack has lost track of control
messages destined for the EPN. When this error is detected, the system
automatically resets the EI circuit pack and brings the EPN down. Service
to the EPN is unavailable for several minutes after detection of this error.
No system technician action is required.
s. Error Type 10001 is a report that the EI circuit pack dropped one control
message to the EPN. This condition may have been observed as a call that
did not complete correctly. No system technician action is required.