Hi Fei,
Please see my comments below. Thanks. Young _____ From: [email protected] [mailto:[email protected]] Sent: Tuesday, December 08, 2009 1:15 AM To: [email protected]; [email protected] Cc: [email protected] Subject: PCEP Requirements for WSON Impairments Hi Dr.Lee and Dr. Bernstein You update a new RWA path request/reply in your presentation about draft-lee-pce-wson-impairments-00.txt The PCReq Message MAY include some specific measure of optical signal quality to which all feasible paths should conform: The BER limit Q factor OSNR + Margin PMD I think the BER limit is composed of required BER value (determined by signal's modulation type )+ OSNR+PMD+margin, and Q factor is equivalent to BER. So the four items listed above should not be in parallel, what do you think? Young>> Here the list does not mean to be mutually exclusive. There are cases where the path needs to be optimized in a particular impairment data such as OSNR or PMD, etc. This requirement comes from a carrier. Another thing needs to be taken care is that the BER value, is it pre-FEC/ after-FEC or should be both included? Young>> Per-FEC is assumed here. If the LSP across some opaque NE (e.g. regenerator/OEO/wavelength converter ), then BER value of LSP consists of several segments. And in this situation, the reply message should return the maximum BER value or every segment's? Young>> The end-to-end BER value is sufficient, I think. B.R. :) Fei
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