local echo
<communications> (Obsolete: "half-duplex") A mode of operation of a
communications program or device in which it displays the characters the user
enters at the same time as it sends them to the remote system.
In communications between computers or computing processes, particularly those
involving human keyboarding and/or reading, duplex came to mean the
re-transmission of a keyboard character to the output display.
Early input device such as the Teletype ASR-33 teleprinter, being descended from
the electric typewriter, printed all input characters as they were typed (i.e.
they did local echo). Local echo was typically optional on the video terminals
that replaced them, and usually disabled in favour of remote echo. A
disadvantage of local echo is that it will continue, even when the communication
circuit has failed, which can be misleading.
(2000-03-30)
Nearby terms:
Local Area Transport « local bus « locale « local
echo
» local exchange carrier » localisation » localised
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