PURPOSE:To prevent omission of a data when byte synchronization is taken again. CONSTITUTION:An encoder 11 receiving a low speed signal converts it into a parallel signal, and a parallel/serial conversion circuit 12 converts the parallel signal into a serial signal. A multiplexer circuit 13 converts the serial signal into a high speed signal. When the state of the multiplexer circuit 13 is changed from the state of receiving a signal representing the transmission of a data into the state of receiving a signal representing untransmission of a data, the multiplexer circuit 13 takes byte synchronization again with a delay of a time for one byte from this point of time.
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