| 摘要 |
PURPOSE:To save the program and processing amount of a central processing unit by providing an interface function and a processing function at a signal link level to a subscriber circuit. CONSTITUTION:A subscriber line state signal is stored in the subscriber circuit 2 having a BORSCHAT function 21 and a function of timing processing is given so as to attain the transition detection such as call, response, hooking and cut- off by the subscriber circuit 2. Further, various processings such as audible signal transmitting function to a subscriber's equipment, the reception function of a dial signal, start call analysis processing and a precoding processing are executed automonously in a closed form in the subscriber circuit 2. Through the constitution above, the program and processing amount of the central processing unit are reduced in comparison with a system where the processings are executed by the central processing unit. Further, subscriber's equipments with different signal procedures are connected easily without program change of the processing unit. |
