Phone Cable Wiring Colours

The black and yellow pair is normally spare and available to install a second phone line.

Phone cable wiring colours. The background color always matches the tracer color of its paired conductor and vice versa. CW1109 Jumper wire is available in various colours including redwhite redblack blueyellow bluewhite greenwhite greenblack and pinkgrey. Colour Codes BT Openreach are using new cables with new colour codes.

The simplest color scheme is used on normal station cable what your phone tech may call JK which has only two pairs of wire. The second pair has one black wire tip and one yellow wire ring. A second telephone line with a different phone number would terminate on solid Black and solid Green.

For example GreenWhite means green base white overprint WhiteGreen means white base green. Normaly when we extend a usb cable it has diffe. The first colour identified is the base colour of the plastic insulation the second colour is printed over the first.

The sixth pair uses the first colour blue with a white stripe bluewhite. The major or primary group of colors consists of the sequence of white red black yellow and violet. Knowing this sequence of five colours allows you to easily determine the order of the remaining pairs as follows.

Subsequent pairs up to pair 10 use blue with each of the remaining colours in-turn blueorange bluegreen bluebrown and blueslate. Old or very new internal cable. The POTS Plain Old Telephone Service residential telephone wiring generally contains two pairs of wires - designed for two separate telephone lines.

2 Blue 3 Orange Bell circuit only used between extensions if no Broadband 5 White. Although the standard wire colors in the USB cable are red black white and green dont worry if that is not the case for your cable. The first pair has one green wire tip and one red wire ring.