| 摘要 |
PURPOSE:To transmit data without adding a preamble signal to transmission data by transmitting and receiving data among all stations based on the same timing. CONSTITUTION:The clock signal generated by an oscillator (10) is converted to an optical signal (120 having a second wavelength band lambda2 by a second optical transmitter (11) and is outputted to the space. This optical signal (12) is reproduced to the original clock signal by each of second optical receivers (57) of optical transmitter-receivers (7) provided on the ceiling and optical transmitter-receivers (9) provided on the floor and is outputted to stations (4) and (5). Each of stations (4) and (5) uses the clock signal outputted from the second optical receiver (57) and uses the optical signal having a first wavelength band lambda3 to transmit and receive data. Consequently, all stations perform the operation based on the same timing. Thus, data can be transmitted without adding a preamble signal (54) just before a data signal (53). |
