| 摘要 |
PROBLEM TO BE SOLVED: To obtain an order wire transmission system by which a telephone call with satisfactory sound quality is possible among all stations except a station where a failure is generated even when there is a failure in one station or a failure on a transmission line. SOLUTION: As an effect of the order wire transmission system, in the order wire transmission system constituted by connecting a plurality of transmitters installed in a master station or a slave station on the transmission lines duplexed in the shape of a ring, a transmitting direction of a line on one transmission line is opposite to a transmitting direction of a line on the other transmission line, each transmission line comprises a loop back line for detecting the failure of the transmission line, for transmitting failure information to other stations and for selecting a transmission line based on the failure information and when the failure occurs on the transmission line, performs transmission by a ring-shaped line using a place wherein the failure of the transmission line does not exist. COPYRIGHT: (C)2004,JPO&NCIPI
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