Origin
The terms tip and ring originated in the early days of telephony, when human telephone operators used phone plugs to connect customer calls. The names of the wires are derived from the part of the plug to which they are connected. The words are often abbreviated as T and R in wiring diagrams. While the ring is connected to −48 volts, the tip is connected to ground for safety. This is because when the telephone operator is handling the plug, the tip is more likely to touch something other than intended.
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Famous quotes containing the word origin:
“The origin of storms is not in clouds,
our lightning strikes when the earth rises,
spillways free authentic power:
dead John Brown’s body walking from a tunnel
to break the armored and concluded mind.”
—Muriel Rukeyser (1913–1980)
“The essence of morality is a questioning about morality; and the decisive move of human life is to use ceaselessly all light to look for the origin of the opposition between good and evil.”
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“In the woods in a winter afternoon one will see as readily the origin of the stained glass window, with which Gothic cathedrals are adorned, in the colors of the western sky seen through the bare and crossing branches of the forest.”
—Ralph Waldo Emerson (1803–1882)