ppp拨号软件，用于GPRS MODEM进行拨号连接到因特网中，支持PDP击活和PDP去活上下文.,ppp dial-up software for GPRS MODEM for dial-up connection to the Internet in support of PDP and the PDP to hit live live context.

GSM07.10规范，串口复用协议。即在一个物理串口上建立多个逻辑连接，从而实现如 在gprs模块上同时进行短信和gprs数据收发同时进行。-GSM 07.10 is a multiplexer protocol specified by ETSI. It operates between a MS and a TE and allows a number of simultaneous sessions over a normal serial asynchronous interface