Optical repeater monitoring system

Details Optical repeater monitoring system Optical repeater monitoring system

1985-05-07

1987-12-01

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

370 131, 375 4, 379 4, 455 9, H04B 900

Patent

active

047109769

ABSTRACT:
An optical repeater for an optical digital transmission line has a pair of in-service monitoring circuits (55, 55') each of which includes a flip-flop (57) for dividing frequency of transmission data to derive commands and burst carrier in the first line (54). A counting means (59, 61) is provided for detecting parity errors and counting the errors in an opposite second line (65). A timing generation means (62) is provided for reading out the counting means (61) upon receipt of the burst carrier. A phase modulator (64) provides phase modulation to a clock pulse in an opposite second line (65) according to the output of the timing generation means (62). The number of errors in the second line (65) is stored in the counting means (61) according to commands in a first line (54) from a terminal transmitter (52). The content of the counting means (61) is forwarded to a terminal receiver (66) through phase modulation of clock pulses in a second line (65) upon receipt of the burst carrier. The commands and burst carrier are constituted by arranging parity bits of in-service data in the first line (54).

REFERENCES:
patent: 4211920 (1980-07-01), Wakabayashi
patent: 4300239 (1981-11-01), Wakabayashi et al.
patent: 4334303 (1982-06-01), Bertin et al.
patent: 4586186 (1986-04-01), Anderson

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