Major difference between 10GE LAN services and 10GE WAN services in OTN equipment

Their bottom-layer encapsulation structures are different. A 10GE WAN signal contains an SDH/SONET encapsulation header but a 10GE LAN signal does not.
10GE LAN service: Ethernet MAC frames are processed based on 66B/64B line coding and then are directly transmitted over an optical fiber at a rate of 10.31 Gbit/s.
10GE WAN services: Ethernet MAC frames are processed based on 66B/64B line coding, encapsulated into standard SDH/SONET frames, and then directly transmitted over an optical fiber at a rate of 9.95 Gbit/s.

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