Fault locating apparatus for digital transmission system

Details Fault locating apparatus for digital transmission system Fault locating apparatus for digital transmission system

1976-06-14

1977-05-10

Olms, Douglas W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

3401461E, H04B 160

Patent

active

040229882

ABSTRACT:
Defective repeaters in a multihop, digital microwave transmission system are located by the use of a special test pattern which is generated at the transmitting terminal. At each repeater station, the two outputs of the phase demodulator are compared to determine if the test pattern has been properly received from the upstream repeaters. The special test pattern, S, has the characteristic that S = S(2N); that is to say, the test pattern equals the complement of itself delayed by 2N symbols. This special characteristic makes it unnecessary to employ a differential decoder in the test apparatus at each repeater station.

REFERENCES:
patent: 3678222 (1972-07-01), Boehly
patent: 3866217 (1975-02-01), Bennett
patent: 3872257 (1975-03-01), Bleickardt et al.

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