Editing Wink pulsing

{{Short description|Telephony signalling technique}}
'''Winking''' is a [[telephony signalling]] technique used both in connection with DC signalling on a trunk, and with indicator lamps on a [[key telephone]].

In [[telephone switching]] systems, '''wink pulsing''' is recurring [[pulse (signal processing)|pulsing]] in which the ''off'' condition is relatively short compared to the ''on'' condition.  In '''wink start''' trunks, the exchange at the originating seizes the trunk for an outgoing call.  The terminating end indicates readiness to receive the dialled [[telephone number]] by sending an off-hook (current reversal) of approximately half a second duration, or "wink".  Upon receiving this ''go ahead'' signal, the originating end uses [[multi-frequency]], DTMF,  or dial pulse signalling to send the phone number.

On [[1A2 Key System|1A2 key systems]] or similar key-operated telephone instruments, the hold position, ''i.e.,'' the hold condition, of a [[telephone line|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.

==References==
*{{FS1037C MS188}}

{{telephony-stub}}

[[Category:Telephony signals]]