The last few metres of a voice circuit, from the socket to the handset.

voice and data round 2 wire telephone cable solid bare copper white
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Flat Telephone Wire Cable Lead 2 Pin for ADSL DSL Router Modem Phone Cable
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Internal 4 Core Telephone Wire Cable HYA 4x0.5mm Solid Copper White 100M
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28 AWG Copper Core 4 Conductor Flat Modular Line Telephone Cord Cable
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6 Core Flat Telephone Silver Satin Modular Cable
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Bulk Flat Telephone Cord, Silver Satin, 26 AWG 8 Conductor, Telephone Cable, Bulk Telephone Wire
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2 Core 18 Awg Outdoor Copper CCS Telephone Cable PE Insulation Telephone Aerial Drop Wire
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AVS 2*0.5mm oxygen free copper conductor pvc insulation voice jumper cable telephone wire
View specification →Telephone cable covers the short runs a multi-pair backbone does not: the extension across a room, the silver satin lead to a handset, the drop from a pole to a house, the jumper across a distribution frame. Each of those is a different construction, and substituting one for another is where installations go wrong.
Flat modular cable for handset and extension leads, where flexibility and a low profile matter more than mechanical strength.
No. Use the PE-jacketed drop wire for external spans — indoor PVC will chalk and crack under UV and let water into the cores.
Two cores carry a single line. Four and six core are specified where extra lines or signalling conductors are needed, or to leave spare cores for later.
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