| 摘要 |
<p>PROBLEM TO BE SOLVED: To accurately identify whether a loop back signal can be exchanged or not by comparing the lapse of time preceding to the time point to restore transmission information contained in a loop back frame through a reception means with a threshold value showing the maximum time to allow delay concerning the transmission of a frame to be modulated by following transmission information, and reporting the state to an information source when the first time exceeds the latter time. SOLUTION: At a slave station 80-1. A transmission detecting part 82-1 applies transmission information and identification information applied from a personal computer 135-1 through a LAN 134-1 and an interface part 141a-1 to a modulation part 138-1. Besides, the period providing the transmission information and identification information is parallelly reported to a collision discriminating part 84-1. Besides, a reception detecting part 83-1 generates a base band signal by demodulating the loop back signal received from a master station 130 through the outgoing link of a radio transmission channel 136 while using a demodulation part 137-1 and applies the transmission information and identification information to a FIFO 140-1 by analyzing that base band signal.</p> |
