Communications cable

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Cables for communications include coaxial and Balanced pair.

Coaxial cables are mostly used for television and other signals with bandwidth of multiple Megahertz. In the middle 20th Century they carried long distance telephone connections.

Balanced pairs are used for shorter distances or smaller bandwidth, such as voiceband. The pairs are usually twisted to reduce crosstalk, except for shortest distances as in Ethernet cables.

Four types of plastic insulation are commonly used in telecommunications cables today: solid, cellular, foam skin and skin-foam-skin. For underground cables in places with district heating, including Manhattan, paper insulation is used since it better withstands heat.

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