Abstract: A switchboard control system in which a plurality of switchboards are connected to a time division exchange and controlled by the time division exchange. A speech signal and a control signal (a signal for key information, display information, subscriber number information and other information necessary for the exchange operation by a switchboard operator), which are delivered and received by each switchboard and the time division exchange, are transmitted together by a common transmission line on a time-division-multiplexed basis. On the side of the system toward the switchboards are disposed a position controller, by which the signals are multiplexed and separated and the common transmission line and the switchboards are interconnected. For delivering and receiving the signals, common channel signalling equipment is connected to the time division exchange and remote channel signalling equipment is provided in the position controller.

Abstract: A centralized supervisory system in an automatic switching system including at least one remote office with a first time-division switching system and a first supervisory unit, and a central office with a second time-division switching system and a second supervisory unit. The first time-division switching system and the second time-division switching system being connected by a time-division multichannel line. Supervisory data output from the first supervisory unit are allocated to one or more predetermined channels on the time-division multichannel line, so that the supervisory data output from the first supervisory unit are transferred through the time-division multichannel line to the second supervisory unit and are centrally supervised therein.