Communications: electrical – Systems – Selsyn type
Patent
1975-01-31
1976-03-02
Habecker, Thomas B.
Communications: electrical
Systems
Selsyn type
340152R, H04M 1104
Patent
active
039421686
ABSTRACT:
A distribution network power line communication system including a central communication terminal at a distribution substation in signal communication with a plurality of remote communication terminals via the electrical distribution power lines. The central communication terminal uniquely addresses a selected remote communication terminal with an interrogation signal which requests the performance of a selected distribution automation function. The selected remote communication terminal performs the requested function and sends a response signal back to the central communication terminal. Signal amplifying repeaters are disposed in signal communication with the electrical distribution power lines, which ensure that the interrogation and response signals are at usable signal levels when they reach their intended destinations. The signal amplifying repeaters include delay devices which provide a signal delay time interval selected such that a repeater will not apply a signal to the electrical distribution power lines at the same time a signal is to be received by the repeater. In one embodiment, the message elements or bits of a signal word are spaced such that each bit of the word is delayed and transmitted by a repeater before the repeater receives the next bit of the word; and, in another embodiment the complete signal word is received by a repeater before the transmitter portion of the repeater is operated.
REFERENCES:
patent: 3693155 (1972-09-01), Crafton
patent: 3733586 (1973-05-01), Lusk
Habecker Thomas B.
Lackey D. R.
Westinghouse Electric Corporation
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