It is because the MSTP based on SDH has developed to be regional multi-service communication network come from the need of LAN-interlink and the new data traffic that the study of encapsulation protocol of MSTP data service over SDH has become especially important. This paper firstly analyzes three kinds of encapsulation protocols which are based on SDH to transport data. The three protocols are GFP, LAPS and PPP, and the study emphases on the encapsulation mode, frame structure, function mode and currency disposal process of the GFP. At last it introduces the GFP's applications in GPON.
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