TIME DIVISION MULTIPLEXER

PURPOSE:To improve the transmission efficiency by providing a retransmission display of a specific value to a multiplex frame having a transmission error, receiving the retransmission display of a prescribed value and abolishing the transmission data of a specific terminal device to improve the transmission error control. CONSTITUTION:A retransmission display part is provided after a header of a multiplex frame and it is set as 0 at all times in the fame which is not used for retransmission. When a multiplexer 2 at the transmission side receives a retransmission request, a transmission control section 12 reads retransmission data from an area 17 to constitute a frame, and sets 1 to the retransmission display part of the frame. An index table 25 corresponding to the specific terminal device is kept in a distribution control section 22 of the multiplexer 4 of the reception side, the table is referenced at each data distribution for each terminal device in the data distribution processing of the reception frame and when the designation is 1 and the retransmission display part of the reception frame is 1, then the data is abolished.