out-of-band

Slang Dictionary

out-of-band

adj. [from telecommunications and network theory]
1. In software, describes values of a function which are not in its `natural' range of return values, but are rather signals that some kind of exception has occurred. Many C functions, for example, return a nonnegative integral value, but indicate failure with an out-of-band return value of -1. Compare hidden flag, green bytes, fence.
2. Also 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 email, such as telephones or snail-mail.
FOLDOC
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
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