Wink is used both in connection with DC signaling on a trunk, and with indicator lamps on a key telephone.
In telephone switching systems, wink pulsing is recurring pulsing in which the off-condition is relatively short compared to the on-condition. In Wink start trunks, the exchange at the originating end sends an off-hook to alert to a call. The terminating end indicates readiness to receive the dialed telephone number by sending an off-hook of approximately half a second duration, or "wink". Upon receiving this go ahead signal, the originating end uses multi-frequency or other address signalling to send the phone number.
On 1A2 key systems or similar key-operated telephone instruments, the hold position, i.e., the hold condition, of a line is often indicated by winking the associated lamp at 120 impulses per minute. During 6% of the pulse period the lamp is off and 94% of the period the lamp is on, i.e., 30 ms (milliseconds) off and 470 ms on.
Famous quotes containing the words wink and/or pulsing:
“The eye is the casement at which the heart generally looks out. Many a woman who will not show herself at the door, has tipt the sly, the intelligible wink from the window.”
—Samuel Richardson (1689–1761)
“A great black presence beats its wings in wrath.
Above the boneyard burn its golden eyes.
Some small grey fur is pulsing in its grip.”
—Anthony Hecht (b. 1923)