JPS5679596A - Carrier common telephone system - Google Patents

Abstract

PURPOSE:To enable to allocate a plurality of telephone sets to a automatic exchanger in one carrier line, by providing a device which detects the operating telephone set and incoming telephone line, transmits the identification code and selects the telephone set and subscriber line through the reception of the code, on the remote station and automatic exchanger side respectively. CONSTITUTION:A two-common-telephone-set trunk (TT3) which connects telephone sets TL1, TL2 to one line of carrier line C3 is located at a remote station, and a two-common-subscriber trunk (ST3) which connects the line C3 to subscriber circuits LRG1, LRG2, is located at an automatic exchanger (SW) side respectively. TT3 detects operation telephone sets TL1, TL2, and the telephone set identifying code corresponded is automatically transmitted to SW side and the corresponding telephone set is called through the reception of the identifying code from SW. At ST3, the incoming telepohne line is detected to automatically transmit the identifying code to the remote station, and the identifying code from the remote station is received and connected to SW via LRG1 and LRG2. Thus, a plurality of telephone sets at the remote station are allocated to SW with one carrier line to the extent that the service degree permits.