The communication device (100) operates in full duplex mode by allowing its transmitter (106) to periodically interrupt transmission to allow for a second communication device (702) to send its request-to-transmit signal. This signal is received by the receiver (108) and coupled to a controller (110)....http://www.google.fr/patents/US5379279?utm_source=gb-gplus-shareBrevet US5379279 - Communication device with time assigned duplex operation
Communication device with time assigned duplex operation