| 摘要 |
PURPOSE:To shorten the period from the occurrence of a fault till its detection by using a delay time from the occurrence of a fault till its detection as plural periods of a radio frame. CONSTITUTION:Slave stations 21, 23-2n apply transmission at a timewise position of a received electric field detection time slot E at each radio frame TF even without the occurrence of a call to send a received electric field detecting burst signal E'. On the other hand, a reception station of an incoming line, that is, a master station 1 or a repeater station 22 monitors a reception signal level at the timewise position of the received electric field detection time slot E and decides it as a fault of a receiver of the incoming line side of its own station when the reception undetection of the received electric field detecting burst signal E' is consecutive for a period of several frames. Thus, the delay time from the occurrence of a fault till its detection is selected to be plural periods of radio frames TF. Thus, the period from the occurrence of a fault till its detection is shortened. |
