out-of-band

Computing Dictionary

out-of-band definition


1. The exchange of call control information on a dedicated channel, separate from that used by the telephone call or data transmission.
2. Sometimes used to describe what communications people call "shift characters", such as the ESC that leads control sequences for many terminals, or the level shift indicators in the old 5-bit Baudot codes.
3. In personal communication, using methods other than electronic mail, such as telephone or snail-mail.
4. Values returned by a function that are not in its "natural" range of return values, but rather signal some kind of exception. Many C functions that normally return a non-negative integer return -1 to indicate failure.
This use confuses "out-of-band" with "out-of-range". It is actually a clear example of in-band signalling since it uses the same "channel" for control and data.
Compare hidden flag, green bytes, fence.
[Jargon File]
(2001-04-08)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
Cite This Source
Explore Dictionary.com
Previous Definition: out-number
Next Definition: out-of-body
Words Near: out-of-band
More from Thesaurus.com
Synonyms and Antonyms for out-of-band
More from Reference.com
Search for articles containing out-of-band
More from Dictionary.com Translator
Dictionary.com Word FAQs

Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature