When a network is configured with SOM, when performing path performance analysis, the OSNR value of the optical amplifier downstream of the OCh path is higher than the upstream optical amplifier. Which of the following analysis is wrong?
A . Initial configuration SOM after routing issued immediately start profiling, when the case back OMS segments configure SOM route, start OSNR calculation, there is no preceding OSNR calculation is based on the phenomenon occurs
B . The calculation of the OSNR value in the first part of the OMS section where the OCH path is located is not completed. At this time, the performance analysis is started. The new calculation value in the previous part is reduced due to external reasons. This phenomenon will occur.
C . network path to the OMS issued segment SOM routing configuration must be performed in sequence from front to back, each OMS issued segment SOM routing configuration consumes about a few seconds, each OMS disposed between segments SOM route exists time difference.
D . Click "Analyze" on the "Path Performance Analysis" interface to restart the performance analysis, which can solve the problem.
Answer: C
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