Method and apparatus for transmission of local area network sign

Details Method and apparatus for transmission of local area network sign Method and apparatus for transmission of local area network sign

1993-02-17

1995-04-18

Chin, Stephen

Pulse or digital communications

Multilevel

Transmission line

375296, H04L 2534, H04L 2549, H04K 102

Patent

active

054085004

ABSTRACT:
A binary signal encoding technique for reducing the amount of electromagnetic interference (EMI) caused by the transmission of high-speed binary signals over an unshielded twisted pair of conductors. Duobinary modulation, combined with low-pass filtering to confine the signals' frequency spectrum, and stop-band filtering to reduce critically high spectral lines, results in an acceptably low level of electromagnetic emission from the twisted pair. Moreover, duobinary modulation and stop-band filtering to reduce spectral lines avoids the need for signal scrambling to reach acceptable radiation levels by spreading the signal energy across the frequency spectrum.

REFERENCES:
patent: 3649751 (1972-03-01), So
patent: 5119402 (1992-06-01), Ginzburg et al.

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