Protected Ring Configuration - Alcatel-Lucent 1675 LambdaUnite Installation And System Turn-Up Manual

Network establishment and testing
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The detection interval is
• for STM-1:
700 s for a BER threshold of 10
78 s for a BER threshold of 10
• for STM-4:
188 s for a BER threshold of 10
21 s for a BER threshold of 10
The SD detection itself has a built-in hysteresis of about one magnitude in BER (that is, if
the SD is set at 10
A feature called "fast termination" is implemented and enabled. As soon as the minimum
error count necessary to declare SD is reached, SD is set immediately, and the interval is
restarted (that is, no waiting until the interval is finished). If all frames are errored, the
detection time for the rates listed above is approx. 10 ms.
Network configuration
Figure 10-1 Protected ring configuration
Rx Tx
NE-A
Tx
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10-6
–8
, it requires a signal better than 10
Tx
Rx
OP
OP
Rx
Tx
Rx
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–9
–8
-9
-8
.
Rx
NE-B
OP OP
Tx
Rx
NE-D
OP OP
Tx
Network establishment
Procedure 10-1: Connecting the fiber cables
–9
to clear the SD).
Rx Tx
OP
NE-C
OP
Tx Rx
OP = Optical Pack
365-374-198R10.5.4
Issue 1 July 2009