| 摘要 |
PROBLEM TO BE SOLVED: To realize call processing control for a channel employing a copy system in a redundant configuration of the speech channel duplication of an electronic telephone exchange. SOLUTION: A copy function is provided to interface circuit boards 21, 22 interfacing a processor 1 and switches 61, 62. When a copy mode is set to the interface circuit boards 21, 22 in active and standby sides under the control of the processor 1 in this copy function, both interface circuit boards 21, 22 respectively inform the switches 61, 62 under the control about a control instruction from the processor 1 to control the switches. Since the processor 1 has only to give the control instruction to either of the switches, the processor 1 saves trouble of giving the control instruction to both switches and can set both switches 61, 62 at the same time.
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