This paper studies the character of DCC conmmunication and PPPprotocol, and invents a negotiation protocol to negotiate the byte type of DCCautomaticly.

• 本课题通过对DCC 底层通信特点的研究,结合PPP 协议实现的特点,提出了一种自创的协商协议来协商DCC 通道的字节类型。