| 摘要 |
<p>PURPOSE:To easily locate a fault block in a short time in the case of multi-relay in a digital multiplex radio system. CONSTITUTION:This method is provided with an intermediate repeater station and a monitoring section where after a frame detection signal is not detected from a digital signal received by a frame synchronizing signal detection circuit 2, and it sends a synchronizing step-out signal, a digital signal generating means 4 generates a digital signal including the frame synchronizing signal and sends it to a subordinate station. The intermediate repeater station is provided with a masking means 5, which sends the synchronizing step-out signal after lapse of a prescribed time as an alarming signal when the inputted out of synchronous signal is consecutive for a prescribed time or more and the monitoring section uses the inputted alarming signal to locate a fault block.</p> |
