dte: data terminal equipment，数据终端设备
ebr(excess burst rate，超额突发速率)
esp: encapsulating security payload，压缩安全有效载荷
fdm: frequency division multi，频率分离
flow-control流控制
fricc: federal research internet coordinating committee，联邦调查因特网协调委员会
ftp(file transfer protocol，文件传输协议)
ghost:(general hardware oriented system transfer，全面硬件导向系统转移)
hdsl: high bit rate dsl，高比特率数字订阅线路
http(hypertext transfer protocol，超文本传输协议)
