翻訳と辞書
Words near each other
・ hdsl
・ hdtv
・ hdx
・ head disk assembly
・ head normal form
・ head normalisation theorem
・ head-strict
・ header
・ heads down
・ heap
heartbeat
・ heat sink
・ heat slug
・ heatseeker
・ heavy metal
・ heavy wizardry
・ heavyweight
・ hebbian learning
・ heisenbug
・ helen keller mode


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heartbeat : FOLDOC
heartbeat
1. The signal emitted by a Level 2 Ethernet transceiver at the end of every packet to show that the collision-detection circuit is still connected.
2. A periodic synchronisation signal used by software or hardware, such as a bus clock or a periodic interrupt.
3. The "natural" oscillation frequency of a computer's clock crystal, before frequency division down to the machine's clock rate.
4. A signal emitted at regular intervals by software to demonstrate that it is still alive. Sometimes hardware is designed to reboot the machine if it stops hearing a heartbeat. See also breath-of-life packet, {watchdog}.
[Jargon File]
(1996-03-12)



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