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25-pair telco cable pinout. A common application of the 25-pair color code is the cabling for the Registered Jack interface RJ21, which uses a female 50-pin miniature ribbon connector, as shown in the following table. The geometry of the pins of the receptacle (right hand image) corresponds to the pin numbers of the table.
25-pair color code chart used in certain kinds of wiring. A color code is a system for encoding and representing non-color information with colors to facilitate communication. This information tends to be categorical (representing unordered/qualitative categories) though may also be sequential (representing an ordered/quantitative variable).
Unshielded twisted pair (UTP) cables are found in many Ethernet networks and telephone systems. For indoor telephone applications, UTP is often grouped into sets of 25 pairs according to a standard 25-pair color code originally developed by AT&T Corporation. A typical subset of these colours (white/blue, blue/white, white/orange, orange/white ...
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An electronic color code or electronic colour code (see spelling differences) is used to indicate the values or ratings of electronic components, usually for resistors, but also for capacitors, inductors, diodes and others. A separate code, the 25-pair color code, is used to identify wires in some telecommunications cables.
A cable color scheme, known as even-count color code, is determined for 25 pairs of conductors as follows: For each ring, the primary, more prominent color is chosen from the set blue, orange, green, brown, and slate, in that order, and the secondary, thinner stripe color from the set of white, red, black, yellow, and violet colors, in that ...
Chuq, this page is about the 25 pair colour code and is correct for Australia as per Appendix B at [S008:2006 (as at April 2006), what you have lsited above is also correct for 20 pair colour code. There are also listed there 2 pair (quad), 3 pair telephone cable colour codes, 1 - 5 pair cable colour codes, 10 pair, and optical fibre colour codes.
However, the number of total colors can be decreased by encoding each value with multiple colors, as in the 25-pair color code, which encodes 25 values using only 10 colors, by assigning each value a color each from group A and group B, each consisting of 5 colors. A qualitative color scheme can be designed similarly to a harmonious color scheme.