Method and circuit arrangement for monitoring the operating cond

Details Method and circuit arrangement for monitoring the operating cond Method and circuit arrangement for monitoring the operating cond

1990-07-31

1993-06-29

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

375108, 375116, 359110, H04B 110

Patent

active

052241289

ABSTRACT:
For recognizing the status of a "no light" condition at the signal input of a receiving terminal, measured values that correspond to the electrical signal level of received signals are stored at given time intervals. In the absence of digital signals, the contents of the memory, potentially in combination with a further measured value, are searched for a change in the amplitude of the received signal. Given a large level change, a "no light" condition is reported.

REFERENCES:
patent: 4211920 (1980-07-01), Wakabayashi
patent: 4257033 (1981-03-01), Ota et al.
patent: 4414676 (1983-11-01), Kraul et al.
"Digital Relay Transmission System", Patent Abstracts of Japan, vol. 10, No. 113 (E-399) [2170] Apr. 26, 1986, for JP-A-60 248 051.
"Error Measuring Circuit", Patent Abstracts of Japan, vol. 7, No. 88 (E-170) [1233] Apr. 12, 1983, for JP-A-58 15 351.
Braun et al, "Digital Transmission on Fiber-Optic Cables in the Long-Distance Network", Telcom Report 10, Special, vol. 10, Dec. 1987.

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