echo command
A programming language command that causes an echo response from a computer to be displayed on a monitor or printer for analysis or monitoring of the progress of processing.
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echo effect
See ghost.
echo line
In computer systems, on a hard-output or display device, a line of information that verifies (reflects) data entered into the computer.
echo loss
The ratio in dB of the power of a transmitted signal that is echo loss weighted (as specified in ITU-T Recommendation G.122) to the power of its reflected echo. [T1.255-1997]
echo path capacity
The maximum echo path delay for which an echo canceler is designed to operate. [T1.508-1998]
echo path delay (EPD)
The time in milliseconds (ms) between the incidence of a signal and the incidence of that signal's echo at a measurement point. [T1.255-1997]
echo return loss
See return loss.
echo sounding
The measurement of the depth of a body of water or the distance to an object in a body of water by measuring the time it takes sound or electromagnetic waves of known velocity to reflect from the bottom of the water body or from the distant object.
Note: In echo sounding, damped cw transmission is usually used.
echo suppression
The procedure by which characters entered into a system are not physically revealed [CESG].
Note: Often employed when passwords are entered so that they are not disclosed to casual observers.
echo suppressor
A device for connection to a two-way telephone circuit to attenuate echo signals in one direction caused by signals in the other direction.
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