Communications transmission system including facilities for supp

Details Communications transmission system including facilities for supp Communications transmission system including facilities for supp

1990-02-22

1992-05-12

LaRoche, Eugene R.

Wave transmission lines and networks

Transmission line inductive or radiation interference...

333 4, 174 32, 174 34, H04B 330

Patent

active

051131595

ABSTRACT:
A balanced mode transmission system (20) for use in a local area network includes at least one twisted pair of insulated metallic conductors (27--27) which at its end is connected through a transformer to a transmitting computer and to a receiving computer (48). Each pair of conductors adjacent to the transmitting end and optionally adjacent to the receiving end is provided with a longitudinal choke (56,57). Also, a longitudinally extending metallic wire (60) is included in the system and is connected possibly through a resistor to ground at each end. The combination of the longitudinal choke at least adjacent to the transmitting end and the longitudinally extending metallic wire is superbly effective in suppressing electromagnetic interference notwithstanding the absence of shielding.

REFERENCES:
patent: 1998960 (1935-04-01), Kaar
patent: 2026308 (1935-12-01), Ganz
patent: 2222406 (1940-11-01), Crossley
patent: 2280950 (1942-04-01), Harder
patent: 3731234 (1973-05-01), Collins
patent: 4056790 (1977-11-01), Pospischil et al.
patent: 4697051 (1987-09-01), Beggs et al.
patent: 4751607 (1988-06-01), Smith
patent: 4755629 (1988-07-01), Beggs et al.
patent: 4860343 (1989-08-01), Zetena, Jr.
patent: 4873393 (1989-10-01), Friesen et al.

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