Abstract: A method of encoding silences during transmission of data packets separated by silences consists in transmitting alternately during each silence two types of empty half-bytes which are mirror images of each other and the first two bits of which do not comprise any median transition and thus do not conform to the Manchester encoding law. According to this method, sending of the last data half-byte of a packet in Manchester code by the transmitter is followed by an empty half-byte yielding a transition with the last bit of the last data half-byte. The transmitter and the receiver may be connected by a single link which then carries the clock signal continuously through the intermediary of the data half-bytes and empty half-bytes. The transmission device comprises a transmitter, a receiver and one or two transmission links.