Network, Networking Technology, Data Communication Terms, Glossary and Dictionary

ABR: Available Bit Rate

Available Bit Rate (ABR) is a type of service or a QOS class defined by the ATM Forum for ATM networks. ABR is used for connections that do not require timing relationships between source and destination. ABR provides no guarantees in terms of cell loss or delays, providing only best-effort service. Traffic sources adjust their transmission rates in response to information they receive describing the statue of the network and its capability to successfully deliver data. Compare with CBR, UBR, and VBR.

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ABR: Available Bit Rate