A Digital PCM Time-Division Switching System

This paper describes a nonblocking processor-controlled digital time-division multiplex (TDM) switching system for six 24-channel digital TDM trunk groups and 48 analog lines. This system uses integrated circuit technology throughout and is capable of handling combined voice-data trunk groups required in military systems of the future. A stored program processor provides a flexible control unit whose control functions can be readily modified. Communication channel interfaces among the common control processor, TDM switch, and signaling units permit line scanning by the digital switching unit under stored program control, and remote control of the switching center by a processor located at another switching center within the network.