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:
“Down the road someone is practicing scales,
The notes like little fishes vanish with a wink of tails,”
—Louis MacNeice (1907–1963)
“I’ve begun to appreciate the generational patterns that ripple out from our lives like stones dropped in water, pulsing outward even after we are gone. Although we have but one childhood, we relive it first through our children’s and then our grandchildren’s eyes.”
—Anne Cassidy (20th century)