CW1308 Extension Cabling

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by: Chris McAndrew
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In the domestic market and the business market, prior to the advent of structured cabling, analogue telephone circuits were delivered over cables which conformed to the specification CW1308.

Multipair cable of 1/0.5mm tinned annealed copper conductors, PVC insulation/polyester taped/PVC sheathed, sheath colour black or white.

Wiring Diagram for master and extension telephone sockets

Pin Use Master Socket 1st Secondary Socket 2nd Secondary Socket 3rd Secondary Socket Pin 1 Not Used Green/White Green/White Green/White Green/White 1 2 'B' wire (-50V to earth) Blue/White Blue/White Blue/White Blue/White 2 3 Bell wire Orange/White Orange/White Orange/White Orange/White 3 4 Earth White/Orange White/Orange White/Orange White/Orange 4 5 'A' wire (0V to earth) White/Blue White/Blue White/Blue White/Blue 5 6 Not Used White/Green White/Green White/Green White/Green 6

Wiring Faults

Problem Solution Phone ringing continuously Terminals 2 and 5 swapped between sockets (2 at one socket connected to 5 on another and vice versa) No ringing Terminal 3 disconnected Ringing but no speech (or very poor speech) and can't dial out. Wire between terminals 2 or 5 broken. Very poor speech quality, possibly poor bell Terminal 3 and 2 or 3 and 5 transposed

CW1308 Colour Code