Lucent Technologies LambdaXtreme Alarm Messages And Trouble Clearing Manual page 90

APR for a Two-Fiber Cut
NE1
ET
APR active
Automatic Restart
Following a Two-Fiber Cut
....................................................................................................................................................................................................................................
3 - 1 0
and DCM pumps for both transmission directions. If the OADM has
only 1 to 3 channels, then the APR active condition may extend to
nodes further downstream.
Figure 3-4 APR Active Zone for two-fiber cut
APR active
NE2 NE3
NE4
Fiber 1
R R
R
Fiber 2
The system performs automatic restart when the damaged fibers have
been repaired. The automatic restart at each NE is triggered by the
successful detection of the Supervisory signal coming from the other
NE. If both fibers are repaired simultaneously, then the two NEs
initiate an identical restart process.
Each NE detects the supervisory channel and initiates the automatic
restart process to restore the copropagating Raman power associated
with that fiber to nominal levels.
The power is restored to the following components:
•
Gain elements in the OA circuit pack:
- EDFA pumps for OA(VOA) in an End Terminal,
OA(Raman), OA(Raman EDFA) , OA(DGEF) in a Repeater,
and OA(OADM LineOut) in an OADM Terminal
- Raman startup copropagating pumps
- Raman startup DCF counterpropagating pumps in
OA(Raman), OA(Raman EDFA) in a Repeater
•
Raman Counterpropagating pumps in the RP Circuit Pack
•
Raman Growth Copropagating and Counterpropagating Pumps if
the RPG Circuit Pack is installed. If the RPG is an RPG(DCF),
then the DCM Growth Pumps are also turned down.
Once the Supervisory Channel is detected, each NE clears the
standing
OSC LOS
detected, each NE clears the standing
Lucent Technologies - Proprietary
See notice on first page
NE5
NE6
OADM
R
alarm condition. Once the DWDM signal is
OTS LOS
Automatic Power Reduction (APR)
NE7 NE8
R R
alarm condition. As the
365-575-783R1.1
Issue 1, June 2002
NE9
ET