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Wink pulsing
Wink pulsing: In telephone switching systems, recurring pulsing in which the off-condition is relatively short compared to the on-condition.
Note: On key-operated telephone instruments, the hold position, i.e., the hold condition, of a line is often indicated by wink[?] pulsing the associated lamp at 120 pulses 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.
Source: from Federal Standard 1037C and from MIL-STD-188
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