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'''Fall back''' is a feature of a [[modem protocol]] in [[data communication]] whereby two communicating [[modem]]s which experience [[data corruption]] (due to line [[noise]], for example) can renegotiate with each other to use a lower-speed [[Connectivity (computer science)|connection]]. '''Fall forward''' is a corresponding feature whereby two modems which have "fallen back" to a lower speed can later return to the higher speed if the connection improves.
Fall back is also a military term and command meaning to retreat and temporarily cease combat.
It is also a nickname for when [[Daylight Saving Time]] ends each year, referring to how clocks are set back one hour in the fall, hence 'fall back'.
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