Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Patent
1991-07-31
1992-11-10
Nimmo, Morris H.
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
174113R, 174120SR, 174121A, H01B 1102
Patent
active
051626098
ABSTRACT:
A fire-resistant cable (20) which is suitable for the transmission of high frequency signals in a local area network includes a core which comprises a plurality of twisted pairs (22,22) of insulated conductors (24,24) and a jacket (35). Each insulated conductor of each pair includes an elongated metallic member (26) and an insulation system (28). The insulation system which is characterized by a suitable low dissipation factor includes dual layers, an outer one of which includes a flame-retardant plastic material. Also, the insulation system is characterized by a suitably low dielectric constant and by compatibility with a relatively short pair twist scheme. In one embodiment, the insulation system includes an inner layer (30) of a polyolefin plastic material and an outer layer (32) of a flame-retardant polyolefin plastic material. The jacket comprises a plastic material characterized by a suitably low dissipation factor and dielectric constant and in a preferred embodiment comprises a flame-retardant polyolefin plastic material. Preferably, the twist length of each pair does not exceed the product of about forty and the outer diameter of an insulated conductor of each pair.
REFERENCES:
patent: 3006787 (1961-10-01), Blewis et al.
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patent: 4697051 (1987-09-01), Beggs
patent: 4755629 (1988-07-01), Beggs
patent: 4873393 (1989-10-01), Friesen
patent: 5001304 (1991-03-01), Hardin et al.
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patent: 5015800 (1991-05-01), Vaupotic et al.
Adriaenssens Luc W.
Beggs Richard D.
Friesen Harold W.
Nutt Wendell G.
AT&T Bell Laboratories
Nimmo Morris H.
Somers E. W.
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