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 虽然由于hdlc / laps本身机制上的缺陷,比如定界机制,字节替换机制复杂,使它在高速的处理环境下的处理能力不如gfp等封装协议,但本论文设计要求的处理速度不是很高,所以选用hdlc / laps协议是适合的。