Hdlc / laps is used as encapsulation protocol to finish the encapsulation and rate adaptation of packets . but because of the defect of hdlc / laps mechanism , for example the delineation and the byte stuff , it ca n ' t be applied to very high speed environment . other encapsulation protocol , gfp , is a trend 雖然由于hdlc / laps本身機制上的缺陷,比如定界機制,字節替換機制復雜,使它在高速的處理環境下的處理能力不如gfp等封裝協議,但本論文設計要求的處理速度不是很高,所以選用hdlc / laps協議是適合的。