| 摘要 |
PURPOSE:To ensure an easy detection of the area of the disconnection fault occurrence by actuating the relay to give a control so that a DC circuit passing through the resistance may be formed between the repeating installation and the relay and then releasing the necessary process relay with the DC circuit cut off. CONSTITUTION:Attendant board ATT is connected to incoming central office trunk CICT provided at the main wire side of main link SWNET. Relay L is provided to subscriber circuit LT and transmits the switch signals from subscriber control unit LTRC under the control of main control part CC when connected to ATT. Thus, relay L is actuated and a control is given so that a DC circuit may be formed to pass through resistance Re between the relay and ATT. Then relay L is released after the necessary process, and the DC circuit is cut off. In this way, the area of the fault occurrence can be detected easily. |
