Lucent Technologies LambdaXtreme Alarm Messages And Trouble Clearing Manual page 91

APR for a Two-Fiber Cut
When only one fiber is
repaired in a two-fiber cut
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365-575-783R1.1
Issue 1, June 2002
associated pumps reach nominal levels the NEs clear the standing
condition. The associated pumps are expected to
Active - Line
reach their nominal levels within 5 minutes of the automatic restart
procedure initiation. If this does not occur, then the associated circuit
pack failure alarms are raised.
After detecting Supervisory signal, NE1/NE2 sends:
•
OSC Defect Clear indication to NE2 (the downstream NE)
•
APR Active Clear indication to the upstream NE
After detecting the DWDM Signal, each NE sends
to adjacent NEs via the RP circuit pack over the Supervisory
defect
Channel.
The upstream NE receives the APR Active Clear indication and
triggers the APR Restart procedure analogous to NE1/NE2.
In a two fiber-cut, when Fiber 1 has been repaired, and Fiber 2 is still
awaiting repair, the following occurs (see
two-fiber cuts" (3-8)):
•
NE1 detects the Supervisory Channel at the OA. Because Fiber 2
is still cut, NE2 will not start the counterpropagating Raman
pumps. APR is still enforced and the alarms continue.
•
In fiber 2, the Supervisory Channel has not yet been detected by
NE2, and the clearing of RDI-L value has not yet been detected
by NE1. APR is still enforced and the alarms will be continued.
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See notice on first page
Automatic Power Reduction (APR)
No Transmission
Figure 3-3, "APR for
APR
3 - 1 1