Hi PCEers We asked a time slot for the I-D:draft-zhang-pce-reqs-for-otn-00.
Because the threshold BER value of an optical path is affected by the FEC and modulation format that the signal adopts, there are some PCEP requirements for PCE applied in OTN networks. Here we give two scenarios: One is that PCC has selected the modulation and FEC function of the signal and limited the threshold of the Pre-FEC BER values, then requests PCE to find an optical path who can satisfy the requirements. PCE returns the results back to PCC. The other is that PCC just requests the path computation (PCC has not loaded the FEC and modulation functions ), PCE determines the FEC/modulation of the signal(including PCC and every opaque optical node in the path), then calculates the BER value, and returns these parameters back to PCC. PCC uses this information to setup the LSP. Be appreciated to Julien & JP for their kindly reminding. Any comments are welcome. :) Fei
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