| 摘要 |
PURPOSE:To effectively utilize a bus between a central processing unit and a line controller by executing the processing of sending a call signal only to a line corresponding to a radio controller in an active state and relieving the load of the central processing unit in the call reception processing. CONSTITUTION:A central processing unit 1 is provided with a simultaneous call command generating section 1a, and each line controller 2 is provided with a simultaneous call processing section 2a and an act line identification section 2b identifying a line in the act state (operating state). When a simultaneous call is made, the central processing unit 1 gives a call command only once to a relevant line controller 2, and the line controller 2 sends a call signal respectively to an active line in plural radio controllers 3 relevant respectively. Since it not required to send individually call signals for all lines accommodated by the central processing unit 1 in the case of making simultaneous calling, the load is relieved. Since a bus 5 is not occupied, the processing efficiency is improved. |
