| 摘要 |
<p>PURPOSE:To efficiently ensure complete full duplex communication with comparatively simple constitution by attaining the transfer of a 1st return signal duplicatedly with a 1st forward signal. CONSTITUTION:A sequence control section 90 controls a switching gate section 40 to open the connection between an input port 20 and an output port 30 in the idle state and controls a gate section 40 in response to the identification in a first-come input detection section 50. Then the identified input port is connected to all output ports except those corresponding to the identified input port to transfer the signal to them. Moreover, an input detection section 70 supervises whether or not a signal from a receiving line comes to the input port corresponding to the output port for signal transfer among the input ports. Then the input port not receiving the signal during a prescribed period from the identification by the detection section 50 is identified among the input ports for supervision, the control section 90 controls the gate section 40 to connect the input port to the output ports including those corresponding to the input port having the signal at first.</p> |
