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
Famous quotes containing the words color and/or code:
“Surely the day will come when color means nothing more than skin tone, when religion is seen uniquely as a way to speak one’s soul; when birth places have the weight of a throw of the dice and all men are born free, when understanding breeds love and brotherhood.”
—Josephine Baker (1906–1975)
“Many people will say to working mothers, in effect, “I don’t think you can have it all.” The phrase for “have it all” is code for “have your cake and eat it too.” What these people really mean is that achievement in the workplace has always come at a price—usually a significant personal price; conversely, women who stayed home with their children were seen as having sacrificed a great deal of their own ambition for their families.”
—Anne C. Weisberg (20th century)