| 摘要 |
PURPOSE:To minimize the state of failure of PBX and to enable efficient operation by the operator and informer in the event of emergency, by enabling the response communication listening by other communication reception circuit which can be handled by the operator, when the operator is under response. CONSTITUTION:When the extension telephone set SUB is taken up for the handset and the communication number is dialed, the vacant outgoing register OR starts the marker MKR, which connects the telephone set SUB and the vacant communication reception circuit EMGT. Further, when the connection is finished, the communication current supply relay A in the circuit EMGT to rhe telephone set SUB is operated to illuminate the incoming display lamps LL0 to LLn via the contacts a1 and d<1>. The operator operates the circuit designation response key ANS0 corresponding to the lamps LL0 to LLn to make response and to activate the relay ON in operation during reception and the relay C connecting the circuit EMGT and the operator board CON. The communication between the telephone set SUB and the operator is made via the contacts C<1>, C<2> and the content of communication is listened by connecting the call tone source PBT via AMP. |
