requirements for pce applied in otn networks draft-zhang-pce-reqs-for-otn-00.txt fei zhang feng gao...
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Requirements for PCE Applied in OTN Networks
draft-zhang-pce-reqs-for-otn-00.txt
Fei Zhang Feng Gao
Yuanlin Bao
ZTE Corporation
PCEP Requirements for OTN
The optical LSP in OTN is sensitive to optical impairments
especially for high peed services, e.g. 40G/100G
Additional information needs to be provided in PCEP when PCE is used:
FEC (forwarding Error Coding) Modulation format BER (Bit Error Ratio)
Scenario1: PCC specifies modulation/FEC
(1) Client1 requests a 40G eth service to Client2 over OTN transport network(2) Node A (PCC) sends PCReq to PCE , specifying a Pre-FEC BER value(3) PCE returns the calculate d results to PCC, including the actual BER value
Pre-FEC BER value consists of:required BER value (determined by modulation/rate)Margin for optical impairments (PMD/OSNR/NLPS)Margin for future use
A
D
E
B
C
PCPepPCReq
Client1 Client2
UNI1 UNI2
PCE
40G Ethernet service request
LSP1
F
G
Scenario2: PCE determines modulation/FEC
(1) Client1 requests a 40G eth service to Client2 over OTN transport network(2) Node A sends PCReq to PCE(3) PCE determines signal’s modulation/FEC of every opaque node along
the path, and the BER value of the LSP
A
D
E
B
C
PCPepPCReq
Client1 Client2
UNI1 UNI2
PCE
40G Ethernet service request
LSP2
F
G
PCRep should contain these parametersModulation formatFECBER
Next Steps
Refine it according to the feedback from meeting or mailing list
Comments are always appreciated
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