ABR - Available Bit Rate

QoS (Quality of Service) class defined by the ATM (Asynchronous Transfer Mode) 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 delay, providing only best-effort service. Traffic sources adjust their transmission rate in response to information they receive describing the status of the network and its capability to successfully deliver data.

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