Speech path control system

Abstract

In a time division switching system of the time-space-time (T-S-T) arrangement, a speech path memory having both forward and backward time switches has addresses corresponding to accommodated lines; and a speech signal and a non-speech signal (a signal indicating an on-hook or off-hook state and other control signals) are transmitted over a highway between each line module and a switch module. When a speech channel is busy, the speech signal is read out from a speech path memory and written therein and transmitted to a remote station. Also when the speech channel is idle, the non-speech signal is written into the speech path memory but, in this case, the non-speech signal is read out into a signal processor or a non-speech signal is written into the speech path memory from the signal processor or a non-speech signal written into the speech path memory from the signal processor is read out onto a line. With this arrangement, a memory for the exclusive use of the non-speech signal, which is required in the prior art for non-speech signal transmission can be disposed of and transmission control of control signals of various line modules can be simplified. The speech path memory is provided with a speech signal storage area and a non-speech signal storage area, by which it is possible to transmit a large amount of information as the non-speech signal in accordance with the requirements of various line modules.