Communications: electrical – Continuously variable indicating – With meter reading
Patent
1984-07-12
1986-11-18
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
370 16, 370 86, 371 62, H04J 116
Patent
active
046238840
ABSTRACT:
The present invention provides a transmission line control system capable of disconnecting and reconnecting a terminal communication apparatus from and to a main transmission 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 communication 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 apparatus 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 transmission line. In order to perform such control operation properly, constants deciding the lengths of time of operation of the signal monitoring devices are determined to satisfy given inequalities.
REFERENCES:
patent: 4058681 (1977-11-01), Imaizumi et al.
patent: 4159470 (1979-06-01), Strojny et al.
Ihara Susumu
Tsunoda Shinji
Hodgkins Sharon
Sumitomo Electric Industries Ltd.
Yusko Donald J.
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