Twisted pairs communications cable

摘要

There is disclosed a communications cable having a cable jacket and a first pair of twisted wires disposed within the jacket, each wire thereof having a conductor surrounded by a first insulating material. A second twisted pair of wires is disposed within the jacket and has a twist lay length different from that of the first twisted pair. Each wire of the second twisted pair has a conductor surrounded by an insulating material. The insulating material of the first twisted pair differs in a physical property from the insulating material of the second twisted pair, the physical property of the insulating material of the second pair being correlated with the physical property of the insulating material of the first twisted pair and with differences in twist lay length of the first and second twisted pairs so that the phase delay of the twisted pairs is matched. There is also provided a communications cable having more than two twisted pairs. The insulating materials include polyolefins such as polyethylene, and fluorinated polymers such as fluorinated ethylene-propylene. The insulating material may be used as either a solid or foamed material covering the conductor. These insulated wires may be used in the transmission of electronic signals in a plenum-rated communications cable.