Color Code
When simple on-premises wiring is color-coded, two-wire telephone plugs or the first pair of a multi-pair connector commonly have the tip wire coded green and ring coded red. In four wire plugs, the second pair has black tip and yellow ring. A third pair consists of white tip and blue ring. For larger cable assemblies more complex schemes such as the 25-pair color code are used.
Telephone technicians often used the phrase "red-right-ring-rear" (or "ring-right-red-rough") to remember that the red wire connects to the right-side post in the wall jack and to the ring on the plug and to the rear lug on main distributing frames. Sometimes "rough" or "ridge" was added for jumper wires with a tactile code.
Read more about this topic: Tip And Ring
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