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more about heartbeat
heartbeat |
3 definitions found From WordNet r 1.6 [wn]: heartbeat n : the rhythmic contraction and expansion of the arteries with each beat of the heart; "he could feel the beat of her heart" [syn: {pulse}, {pulsation}, {beat}] From Jargon File (4.2.3, 23 NOV 2000) [jargon]: heartbeat n. 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 synchronization 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}. From The Free On-line Dictionary of Computing (13 Mar 01) [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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