| 摘要 |
PURPOSE:To attain full duplex two-way transmission by controlling a switch provided among a transmission voice circuit, a transmission control circuit and an E/O conversion circuit and among a reception voice circuit, a reception control circuit and an O/E conversion circuit respectively so as to apply a PAM time division multiplexing to each signal. CONSTITUTION:The switches 11,12 provided among the transmission voice circuit 1, the transmission control circuit 4 and the E/O conversion circuit 6 and the switches 13, 14 provided among the reception voice circuit 2, the reception control circuit 5 and the O/E conversion circuit 7 are controlled to apply PAM time division multiplexing. The voice from a master set is sent by a transmission voice SW 11 from a transmission voice signal (a) via the transmission voice circuit 1, and the voice from the slave set is sent by the transmission voice switch 11' from the transmission voice signal a' via the transmission voice circuit 1' as the reception voice signal via the reception voice circuit respectively. Thus, a multiplexing circuit is realized simply and inexpensively by one optical transmission line.
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