High Quality Content by WIKIPEDIA articles! Out-of-band (OOB) is a technical term with different uses in communications and telecommunication. In case of Out-of-Band signaling Method, Signaling bits are sent in special order in a dedicated signaling frame. D-channel in ISDN is an example of Out-of-Band and CCS signaling methods. The use of the word "band" in "out-of-band" originates from the term as used in radio and other electronic communications.

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