| 摘要 |
PURPOSE:To attain the mutual connection of telephone sets and to simplify the constitution, by accommodating key telephone sets to a main channel network via subscriber lines, providing a key telephone set control circuit for each key telephone set group and providing a means transferring the information among the control circuits. CONSTITUTION:Key telephone sets 130-13n, 140-14n are sectioned into plural groups via subscriber circuits 110-11n, 120-12n and accommodated in a main channel network 100. Each group is provided with key telephone set control circuits 150-15n, and information transfer control circuits 180-181 of the circuits 150-15n are connected to the network 100 via a central control circuit 200. A key telephone control information transfer circuit 190 is connected among the control circuits 180-181 of the circuits 150-15n. The exchange processing required for the control of the telephone sets 130-13n, 140-14n is executed at the circuits 150-15n, the transfer of the control information among the circuits 150-15n is executed at the transfer circuit 190, allowing to simplify the system constitution. |
