| 摘要 |
PURPOSE:To prepare a stand-by circuit for a group consisting of various circuits, by connecting a circuit which corrects the function of a circuit correspondence circuit, when getting out of order, by using one make contact or more than one make contact. CONSTITUTION:Subscriber's circuit LC, when getting out of order, is supplied with a transfer control signal and the make contact operates, so that circuits will never be disconnected from the circuit correspondence part. When a battery supply becomes impossible owing to a break of subscriber's circuit LC, make contact (t) is operated and make contact (b) of stand-by battery supply circuit SUC is also operated. Further, when hybrid circuit HYB of subscriber's circuit LC will not operate, make contacts (t) and (h) are operated and stand-by hybrid circuit SHC recovers the function of subscriber's circuit LC in trouble. In case that the function of subscriber's circuit LC operates partially, make contacts (t), (b) and (h) are operated to offer the subscriber the same services as before the trouble. |
