Communications system

A communication system, the communication system comprising an end of the communication with the second through a wireless channel first; and frame is in the form of the data in the wireless channel transmission; each type frame comprises multiple frames; each frame comprises multiple time slots; The system comprises: The first working mode, a assigns second time slot each frame for is provided with a speed data channel of circuit switch communication, a defined the data channel; The second working mode, a defined two half rate data channel circuit for switch communication, wherein parts by each type frame corresponding to the time slot frame same number's assigns to the two data channels in each realizing; A third working mode, comprising a defined of the fourth speeds the data channels for circuit switch communication, wherein parts by each type frame corresponding to the time slot frame same number's assigns to the data channels in each realizing.