JPS5625862A - Communication exchanger - Google Patents

Abstract

PURPOSE:To enable suitable communication without alarm sound, by limiting the subscriber possible for transmission and reception, and making one subscribing line possible for transmission as exclusive use with reception and enabling to communicate with the hooked subscriber when the subscriber only with reception is hooked. CONSTITUTION:In the meeting communication, the telephone sets for the subscribers A-E are taken as the transmission and reception exclusive use telephone sets 1a-1e, and the telephone sets for other subscribers F-N are taken as the reception exclusive use telephone sets 1f-1n, to limit the subscribers possible for transmission and reception. Further, when the subscriber F only possible for reception of the telephone set 1f is in hooking, the DC loop monitor circuit 9f detects it and informs it to the control circuit 3. The control circuit 3 receiving this information selects the communication path corresponding to the telephone sets 1a-1e of the one subscriber out of A-E assigned possible for transmission and reception, and when this communication path is opened and the communication path of the monitor circuit 9f corresponding to the subscriber F is opened, the monitor circuit 9f is connected to the communication path selected from the telephone sets 1a-1e to prevent the alarm tone of the hybrid circuit 6.