G.709 of 3.3 　 　 - interface of optical transmission network

G.709 defined a few new interface, frame and function. Special, the high rate container that it introduced highest 40Gbit/s and forward error correction (FEC) , it can work on many wavelengh. Altogether, it is ” of super frame of a kind of “SDH.

The core of G.709 is a new frame structure, it can include aleatoric frame, for instance aether net, IP or STM frame.

Every business signal above all map arrives load of a smooth channel is unit (OPU) , it changes business advocate deferent frame, believe path data unit solely namely (ODU, graph 2) . This is equivalent on particular significance at VC-4. OPU and ODU also have order and degree (namely ODUk) , 1 imply of K ＝ 2.5Gbit/s, k ＝ 2 for 10Gbit/s, k ＝ 3 for 40Gbit/s.
　　
These ODU can exchange high-ranking data to flow directly, and need not decompose them for low rank VC. And, the management to a few wavelengh was included in OCh, OMU and OTM expense, this also provided the function of completely smooth in the future exchange. Final ODU can be used together with GFP shed data, even if 10Gbit/s or 40Gbit/s data flow, direct map arrives in new frame structure, the application of the IP” network that because this issues generation SDH standard,can promote “WDM go up or net of operation class aether.


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