A data transmission device that connects a remote terminal to a telephone circuit and converts the signal of terminal into the signal of line or converts the signal transmitted from processing center into the signal of remote terminal.

• 一种数传设备，它把远程终端设备连到电话线上，并把终端的信号转换成线上传输的信号，或把处理中心传送来的信号转换成远程终端设备信号。