Out-of-band

Out-of-band is activity outside a defined telecommunications frequency band, or, metaphorically, outside some other kind of activity. Protection from falsing is among its purposes.

Examples

General usage

Out-of-band agreement, an agreement or understanding between the communicating parties that is not included in any message sent over the channel but which is relevant for the interpretation of such messages
More broadly, communication by other than the normal communication method is considered "out-of-band". For example, given a website's normal communication method is the internet, out-of-band communication may be by a voice call. Or, it may be by a Mobile phone, as an SMS message. Out-of-band communication may even be by beeps from the PC speaker on the server's Motherboard.

Telecommunications

Out-of-band signaling, the exchange of call control information in a separate band from the data or voice stream, or on an entirely separate, dedicated channel

Computing

Out-of-band data, in computer networking, a separate stream of data from the main data stream
Out-of-band management, in computer administration, system console access, even in the event of primary network subsystem failure
Out-of-band authentication, user authentication over a network or channel separate from the primary network or channel; used in multi-factor authentication

References

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