Apr For A Single-Fiber Cut; Apr For A Single Fiber Cut - Lucent Technologies LambdaXtreme Alarm Messages And Trouble Clearing Manual

APR for a Single-Fiber Cut

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Overview
APR activation
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365-575-783R1.1
Issue 1, June 2002
When a fiber connecting two network elements is cut, it causes the
loss of the DWDM signal and the supervisory signal on that fiber.
The LOS detection of the Supervisory and DWDM signals at the
respective nodes will trigger the following activity at the NEs:
•
Power is reduced at either the OA or RP circuit pack and the
RPG circuit pack, if present.
•
Associated alarm conditions are raised
•
The upstream node is notified of the problem
An automatic restart will be triggered when the damaged fiber has
been repaired.
Figure 3-1, "APR for a single fiber cut" (3-3)
fiber cut case. The fiber cut affects all the channels in the Extended L
band transmitted from NE1 to NE2 and the supervisory channel
transmitted from NE2 to NE1.
Figure 3-1 APR for a single fiber cut
NE1
OSC LOS
OA
Copropagating
Raman
SUPVY
RPG
RP
APR circuits
Lucent Technologies - Proprietary
See notice on first page
DWDM Signal
Supervisory Signal
DWDM Signal
Supervisory Signal
Automatic Power Reduction (APR)
shows APR for a single
NE2
OTS LOS
RP
Counterpropagating
Raman
SUPVY
RPG
OA
APR circuits
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