A simultaneous voice plus data modem, operating at a voice plus data signalling rate of 4800 bit/s, with optional automatic switching to data-only signalling rates of up to 14 400 bit/s, for use on the General Switched Telephone Network and on leased point-to-point 2-wire telephone type circuits
一种同步语音加数据调制解调器 以4800位/秒的语音加数据信令速率运行 可选自动切换至高达14 400位/秒的纯数据信令速率 用于一般交换电话网络和租用的点对点双线电话型电路