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Idaho State University

Glossary

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H
H
Hat
HCF
HD
HDM
Hex
HF
HLL
Hog
HOL
Hop
HSM
HUS
Hz
Heartbeat
  • n. 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 synchronization 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.