H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/71
H04L 1/24 (2006.01) H04L 12/437 (2006.01)
Patent
CA 1223933
TRANSMISSION LINE CONTROL SYSTEM Abstract of the Disclosure: The present invention provides a transmission line control system capable of disconnecting and reconnecting a terminal communication apparatus from and to a main trans- mission line reliably and quickly at such occasions as a fault in the line, correction of the fault, cutting off and turning on of a power source. The control system according to the present invention includes, for each terminal commu- nication apparatus, two subsidiary communication lines, a by-pass, two signal monitoring devices, and four change- over switches. Each signal monitoring device monitors data signal passing through the subsidiary transmission lines and controls the switching operation of the change-over switches so that, upon occurrence of a line fault or a disconnection of the power source, only the terminal communication appara- tus related to the trouble is disconnected from the main transmission line and that, upon correction of the line fault or turning on of the power source, said terminal communication apparatus is reconnected with the main trans- mission line. In order to perform such control operation properly, constants deciding the lengths of time of opera- tion of the signal monitoring devices are determined to satisfy given inequalities.
458568
Ihara Susumu
Tsunoda Shinji
Riches Mckenzie & Herbert Llp
Sumitomo Electric Industries Ltd.
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