| 摘要 |
PURPOSE:To simplify the terminal telephone set while utilizing the function of a concentrated exchange and a key telephone set, by connecting a terminal device and a central controller with a channel line and a control line, and attaining the transmission, reception, transfer with external lines and calls between terminal devices with an arbitrary terminal device. CONSTITUTION:A central controller A is provided with an external/extension line coupler A-8 connecting the external line 0 and terminal devices B, BN, and a time division multiplex line central transmitter A-1 connected to the devices B, BN. Further, a microcomputer A-2 processing and managing each reception information such as a call signal from the external line 0, a transmitting signal and a dial signal from the devices B, BN is provided. Moreover, the devices B, BN are provided with line connectors B-1, BN-1, signal generators B-2, BN-2 and telephone sets B-3, BN-3. The arbitrary devices B, BN attain the outgoing, incoming calls, transfer with the line 0 and calls between the devices B and BN, the function of the concentrated exchange and the key telephone set is utilized, and the constitution of the devices B, BN is simplified. |
