Cross-talk measurement apparatus with near-end compensation

Details Cross-talk measurement apparatus with near-end compensation Cross-talk measurement apparatus with near-end compensation

1995-01-27

1996-07-02

Regan, Maura K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Parameter related to the reproduction or fidelity of a...

364483, G01R 2704

Patent

active

055326030

ABSTRACT:
A pulse-based cable crosstalk measurement instrument provides near-end cross talk (NEXT) information for characterizing the performance of local area network (LAN) cable systems. Accuracy of the cross-talk measurement is enhanced by measuring and mathematically removing the cross-talk effects of the near-end connector. Accuracy of the cross-talk measurement is further enhanced by conducting the cross-talk measurement with pulses of differing pulse widths selected to have increased pulse energy in frequency ranges of interest. A composite cross-talk response using the individual cross-talk responses of the individual pulse widths concatenated together is created and then compared with an industry-standard pass fail limit to provide a pass-fail decision on a LAN cable test system under test.

REFERENCES:
patent: 3745266 (1973-07-01), Niedereder
patent: 4290010 (1981-09-01), Blaess et al.
patent: 4977376 (1990-12-01), Schiek et al.
patent: 5063351 (1991-11-01), Goldthorp
patent: 5185735 (1993-02-01), Ernst
"A Time Domain Crosstalk Test For Cables" Brooks et al. International Wire & Cable Symposium (13-15 Nov. 1979).

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