Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1982-03-03
1984-05-15
Britton, Howard W.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455602, 455606, 455607, 370 3, H04B 900
Patent
active
044492448
ABSTRACT:
A single main optical wave guide section is employed for carrying signals both away from circuits monitoring a high voltage transmission system and toward circuits for causing the operation of switching equipment in the high voltage line. Control circuit equipment which is remotely located from the high voltage power conductor receives and produces optical signals required for monitoring the system state and causing the operation of the protective equipment. Transmitted and received signals are isolated from one another within the single line by branching the ends of the line into two branches which deal with monitoring signals and control actuating signals, respectively. The branched optical fiber ends prevent transmission of signals from one branch to the other but permit the transmission of the signals from either branch to the main body or from the main body to either branch. The main body can be divided into as many branches as desired.
REFERENCES:
patent: 3461384 (1969-08-01), Bayati
patent: 3506833 (1970-04-01), von Willisen
patent: 4054834 (1977-10-01), Boirat
patent: 4107519 (1978-08-01), Bicek
patent: 4301543 (1981-11-01), Palmer
BBC Brown Boveri & Company Limited
Britton Howard W.
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