Communication line transient protection

Details Communication line transient protection Communication line transient protection

1986-08-11

1988-06-14

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

361 58, 361135, 379416, 333 25, 333 32, H02H 908

Patent

active

047516070

ABSTRACT:
The severity of the problems of transmitting high speed data over a regular twisted wire pair are legendary. These problems arise from a variety of conditions, including the capacitance of the wire (which increases with length) and the propensity of unshielded wire to pickup high induced voltages. An arrangement is disclosed that is suitable for short, as well as long, wire distances and which also effectively eliminates the interference problem caused by induced voltages, including those causes by electrostatic discharge. This arrangement passes two twisted wire pairs through a series of ferrite cores. The twisted wire pairs coming out of the ferrite cores are terminated such that one of the pairs is connected to ground while the signal carrying twisted pair is connected to a small signal balun coil, pulse shaping circuit and low pass filter.

REFERENCES:
patent: 1714476 (1929-05-01), Milnor
patent: 1769969 (1930-07-01), Shaw
patent: 1836575 (1931-12-01), Cannon
patent: 2159927 (1939-05-01), Cannon
patent: 2338405 (1944-01-01), Cash et al.
patent: 2362549 (1944-11-01), Hale
patent: 3223920 (1965-12-01), Sasaki
patent: 3683271 (1972-08-01), Kobayashi
patent: 4056790 (1977-11-01), Pospischil et al.
patent: 4254442 (1981-03-01), Dijkmans
patent: 4259705 (1981-03-01), Stifter

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