Method and apparatus for measuring the bit error frequency in a

Details Method and apparatus for measuring the bit error frequency in a Method and apparatus for measuring the bit error frequency in a

1976-05-14

1977-10-11

Olms, Douglas W.

Telegraphy

Systems

Printing

178 69A, H04B 346

Patent

active

040537234

ABSTRACT:
A method and an apparatus for measuring the bit error frequency in a cable caused by crosstalk from at least one disturbing pair to a disturbed pair at transmission of a 3-level coded PCM signal utilizes the fact that a PCM signal transferred on a pair and the disturbances superimposed on this signal by crosstalk from other pairs are mathematically uncorrelated. The amplitudes of the disturbances measured on the disturbed pair are sampled after equalization in a regenerator with a sampling frequency which equals the bit time frequency of the PCM signal intended for transmission on the pair. The number of detected sampling values whose magnitude exceeds a certain threshold value is a function of the estimated bit error frequency.

REFERENCES:
patent: 3745266 (1973-07-01), Niedereder
patent: 3890470 (1975-06-01), Allen

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