Supervision of transmission systems

Details Supervision of transmission systems Supervision of transmission systems

1983-04-27

1985-02-12

Orsino, Jr., Joseph A.

Telecommunications

Carrier wave repeater or relay system

Monitoring

17917531R, 370 74, 370 75, 370 98, 455601, H04B 900

Patent

active

044996004

ABSTRACT:
In a repeater for a communication system a continuously running local oscillator (P) injects a pilot tone into the repeater input, ahead of all the non-linear functions. The repeater may include an input amplifier 1, a re-shaping amplifier 2 and an output amplifier 3. The pilot frequency is unique to the repeater and is sufficiently close to the clock frequency in a digital system or the carrier frequency in an analogue system to allow the pilot to pass through all the repeater filters. The pilot effects a small phase modulation of the carrier or clock. Measurement of the amount of phase modulation and also the pilot amplitude at the receiving terminal indicates degradation or failure of the system performance. The pilot frequency is used to identify the repeater.

REFERENCES:
patent: 3311714 (1967-03-01), Howson
patent: 4211920 (1980-07-01), Wakabayashi
patent: 4249264 (1981-02-01), Crochet et al.

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