| 摘要 |
<p>A hierachical data transmission system is comprised, in the transmitter side, of pre-group multiplexers (FY1 & FY2) and a main-group multiplexer (23) and, in the receiver side, of a main-group demultiplexer (26) and pre-group demultiplexers (7 & 8). The main-group multiplexer (23) is fabricated as a parallel-serial converting unit, and the main-group demultiplexer (26) is fabricated as a serial-parallel converting unit. Each of the pre-group multiplexers (FY1 & FY2) produces a pre-group data train (D1 & D2) having a sub-data signal which is also utilized for distinguishing one pre-group data train from another. Each of the pre-group demultiplexers (7 & 8) is provided with a discriminator operative (27 & 28), by using the sub-data signal, to distinguish one received pre-group data train from another. </p> |
