H - Electricity – 01 – B
Patent
H - Electricity
01
B
H01B 11/02 (2006.01) H01B 7/295 (2006.01)
Patent
CA 2073906
A fire-resistant cable 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 of insulated conductors and a jacket. Each insulated conductor of each pair includes an elongated metallic member and an insulation system. The insulation system which is characterized by a suitably 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 of a polyolefin plastic material and an outer layer 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.
Adriaenssens Luc Walter
Beggs Richard Douglas
Friesen Harold Wayne
Nutt Wendell Glenn
American Telephone And Telegraph Company
Kirby Eades Gale Baker
LandOfFree
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