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variable bit rate
A QoS class
defined by the ATM Forum for Asynchronous Transfer Mode (ATM) networks. VBR is
subdivided into a real time (RT) class and non-real time (NRT) class. VBR (RT)
is used for connections in which there is a fixed timing relationship between
samples. VBR (NRT) is used for connections in which there is no fixed timing
relationship between samples, but that still need a guaranteed QoS. Compare
with ABR (available bit rate), CBR, and
UBR.
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