Communications: electrical – Continuously variable indicating – With meter reading
Patent
1986-10-10
1989-06-27
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
455601, H04Q 900
Patent
active
048433829
ABSTRACT:
A monitoring control system for a digital transmission line including above one repeater provided between two end stations uses a monitoring control signal of an alternating code with the polarity thereof inverted at a frequency or out-of-serice of a digital transmission line. The alternating code is transmitted, with the polarity thereof inverted at a frequency determined by monitoring control information, from an information transmission side between the repeater and one of the end stations for the transfer of control information. On an information reception side therebetween an exclusive OR of a received signal and an alternating code obtained through frequency division of a clock signal extracted from the received signal is obtained. The frequency component is reproduced from the exclusive OR. And the monitoring control information transmitted from the information transmission side is identified in a step of generation of the reproduced frequency component.
REFERENCES:
patent: 3909563 (1975-09-01), Ghosh et al.
patent: 4194092 (1980-03-01), Luder
patent: 4211920 (1980-07-01), Wakabayashi
patent: 4270029 (1981-05-01), Sato et al.
patent: 4319080 (1982-03-01), Kuwahara
patent: 4333178 (1982-06-01), Farrington
patent: 4363002 (1982-12-01), Fuller
Oda Hidenori
Yano Hiroaki
Holloway III Edwin C.
Kokusai Denshin Denwa Co. Ltd.
Yusko Donald J.
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