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VBR Last modified: Wednesday, February 26, 2003
Short for variable bit rate, or Class B quality of service, an ATM bandwidth-allocation service that allows users to specify a throughput capacity (i.e., a peak rate) and a sustained rate but data is not sent evenly. VBR is often used when transmitting compressed packetized voice and video data, such as videoconferencing. Compare with ABR, CBR and UBR.
	Related Categories Data Transfer Rates Networking Standards Videoconferencing Related Terms ABR ATM CBR QoS throughput UBR videoconferencing