Apr Active Zone For Single-Fiber Cut - Lucent Technologies LambdaXtreme Alarm Messages And Trouble Clearing Manual

APR for a Single-Fiber Cut
Active Zone for
Single-Fiber Cut
NE1
NE2
ET R
Automatic Restart
Following a Single-Fiber
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365-575-783R1.1
Issue 1, June 2002
When DWDM signal LOS is detected and APR is activated, the
following alarm conditions are raised:
•
OTS LOS with AID of the In port of the associated RP circuit
pack
•
APR active: line with AID of the associated RP circuit pack
After detecting DWDM signal LOS, NE2 sends indication of
Transmission defect to NE3 via the RP circuit pack over the
Supervisory channel.
Important! The Supervisory signal from NE2 to NE1 remains on to
enable automatic restart after the fiber is repaired.
Figure 3-2, "APR Active Zone for single-fiber cut" (3-5)
APR active zone for a single fiber cut. The APR condition is expected
in NE2 through NE5. NE2 will have APR active- line non-alarmed
condition indicating the turn down of OA and the copropagating
pumps. NE3 and NE4 will have the APR active-line non-alarmed
condition for copropagating,, counterpropagating, and DCM pumps for
the impacted transmission direction only. NE5 will have the APR
active-line non-alarmed condition for counterpropagating pumps in RP
and RPG for the impacted transmission direction only.
Figure 3-2 APR Active Zone for single-fiber cut
APR active
NE3
NE4
R
R
The system performs automatic restart as soon as the damaged fiber is
repaired. The automatic restart at NE1 is triggered by the successful
Cut
detection of the Supervisory signal sent by NE2 to NE1. After
detecting the supervisory signal, NE1 notifies NE2 that the
Supervisory defect has been cleared. This notification causes NE2 to
initiate the restart process. See
cut" (3-3).
Lucent Technologies - Proprietary
See notice on first page
NE5
NE6
OADM
R
Figure 3-1, "APR for a single fiber
Automatic Power Reduction (APR)
shows the
NE8
NE7
R R
NE9
ET
3 - 5