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Definition: VBR

(1) See MP3 VBR and Vouch By Reference.

(2) (Variable Bit Rate) A channel that alters its transmission speed based on changing conditions.

(3) (Variable Bit Rate) A service level in an ATM network. Real-time VBR (rt-VBR) provides minimal delays for interactive voice and video. Non-real-time VBR (nrt-VBR) is used for bursty business transactions. See ATM.

(4) (Volume Boot Record) See boot sector.