METHOD AND SYSTEM FOR MONITORING BACKWARD OBSTACLE ABOUT TRANSMISSION RELAY DEVICE

摘要

PURPOSE: A method and system for monitoring backward obstacle about transmission relay device automatically let off the forward output. In that way the reverse fault is recognized easily in the system of a rear end of relay transmission equipment or a terminal. CONSTITUTION: A remote device transmits the service signal with a relay transmitting device(S902). A donor device or a remote control apparatus detects the reverse input level and reverse output level(S904). In case the apparatus gain is the predetermined standards or less, a donor apparatus or the remote control apparatus turns off the forward(S908). If the OFF-state of the forward output of the remote control apparatus is detected, the relay transmitting device generates the alarm signal which does for the sake of to inform of the reverse fault(S910).