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Idaho State University

Glossary

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Echo
  • ICMP message that asks another host to reply.
  • A wave that has been reflected or otherwise returned with sufficient magnitude and delay to be perceived. Note 1: Echoes are frequently measured in decibels relative to the directly transmitted wave. Note 2: Echoes may be desirable (as in radar usage) or undesirable (as in telephone usage). See also echo attenuation, echo suppressor, feeder echo noise, forward echo, ghost, return loss.
  • In computing, to print or display characters (a) as they are entered from an input device, (b) as instructions are executed, or (c) as retransmitted characters are received from a remote terminal.
  • For an interactive computer graphics display, the immediate notification of the current value for a graphics parameter or operation as selected by the user.