wake-up signal

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Noun1.wake-up signal - (military) signal to wake upwake-up signal - (military) signal to wake up  
bugle call - a signal broadcast by the sound of a bugle
armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker"
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References in periodicals archive ?
Carrier said: "Caffeine is the most widely used stimulant to counteract sleepiness, yet it has detrimental effects on the sleep of night-shift workers who must slumber during the day, just as their biological clock sends a strong wake-up signal. The older you get, the more affected your sleep will be by coffee."
Both SAS and SATA use Common-Mode signaling during initialization and as a wake-up signal when asleep.
Small, 125 kHz wheel arch antennas are used to send the wake-up signal to the specific TM, which responds via the RF link.