| 摘要 |
PURPOSE:To standardize the switching control formats of normal telephone sets and key telephone sets to facilitate control by providing a control information transfer line between a key telephone set control circuit which controls the key telephone sets, group by group, and the central control circuit of an exchange to connect directly the both. CONSTITUTION:The key telephone set control circuit 150 controls one group of key telephone sets 130-13n individually. When the key telephone sets outputs a control request, an individual processing circuit 160 in the circuit 150 analysises by the control program and data in a storage circuit 170 and control which does not require the control of the central control circuit CC20 of the exchange main frame is carried out by the circuit 150. Control which requires the processing of the CC200 is converted in transfer format similar to that to a normal telephone set to transmit it by an information transfer control circuit 180 to the CC200. By the control information, and control program and data in a storage circuit 172, processing circuit 162 in the CC200 exchange and process the selection connection control for a main channel network 100 similarly for that of a normal telephone set. |
