| 摘要 |
<p>A signal multiplex transmission system has predetermined work stations (10-1, 10-2, ..., 10-k) included in a plurality of terminal units which respectively process data in predetermined forms, and a private branche exchange or PBX (22). A transmission line (14) is connected between the predetermined work stations (10-1, 10-2,.... 10-k) and the PBX (22) to commonly transmit frequency-multiplexed data from the PBX (22) to the predetermined work stations (10-1, 10-2,.., 10-k). A separation filter (18) separates first multiplexed signals supplied from the predetermined work stations (10-1, 10-2, ..., 10-k) from second multiplexed signals from other work stations and supplies the separated first multiplexed signals to the PBX (22) independently of the second multiplexed signals, which signals are amplified by an amplifier (30). A mixer (26) is connected to the PBX (22), the amplifier (30) and a reception line (16). The first and second multiplexed signals are mixed by the mixer (26), and composite data is sent onto the reception line (16). The signal lines (14, 16) are used to transmit the multiplexed signals having the same frequency band.</p> |
