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Pulsation of the heart coincident with ventricular systole.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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.
A periodic synchronisation signal used by software or hardware, such as a bus clock or a periodic interrupt.
The "natural" oscillation frequency of a computer's clock crystal, before frequency division down to the machine's clock rate.
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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
heartbeat(1) A periodic signal generated by hardware for activation and/or synchronization purposes. See MHz.
(2) A periodic signal generated by hardware or software to indicate that it is still running.
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