| 摘要 |
PURPOSE:To improve the channel utilization efficiency of a circuit and to shorten a processing time by allowing a terminal-side computer to modulates and output the 2nd high frequency signal from the 2nd modulating means when receive data is data which permits transmission and to resend request-to-send data when the data is data which reports a collision. CONSTITUTION:When a frequency converter 4 sends transmission permission data or collision report data as the 3rd frequency signal FH at a request to send from computers 12a, 12b...12n at terminal sides C, a transmission requesting computers at a terminal side C transmits data as the 2nd high frequency signal FL2 when the transmission permission data is received or resends request-to-send data as the 1st high frequency signal FL1 a certain delay time later when the collision report data is received. The high frequency signal FL2 is frequency- converted by the frequency converter 4 into the 3rd high frequency signal FH which is sent to the terminal sides C. The computers 12a, 12b...12n at the terminal sides C demodulate the 3rd high frequency signal FH to obtain receive data and fetches and processes the data when the data is addressed to the computers.
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