PURPOSE: To simplify a digital exchange and to transmit control information at a high speed, by adding an identification code to voice and line control information and selecting either the voice information or the line control information read out from a control memory based on the identification code.
CONSTITUTION: The line control information (d) transmitted from the central controller CC to each subscriber circuit LC is stored in a prescribed address L of a control memory CM. Each address of the memory CM is provided with an area storing the identification code (i) in addition to the areas storing the readout address of a channel memory SPM and the information (d). Further, a selecting circuit SEL3 is provided between the memory SPM and a selecting circuit SEL2, and the circuit SEL3 is controlled with the identification code (i) read out together with the read-out address and the information (d) from the memory CM. Then, the voice information read-out from the memory SPM and the line control information read-out from the memory CM are selected with the identification codes (d), (i), allowing to transmit the control information at high speed without reducing the allocated line.
KATANO HIROKI
SUMIDA TETSUAKI
