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unspecified bit rate
A QoS class
defined by the ATM Forum for Asynchronous Transfer Mode (ATM) networks. UBR
allows any amount of data up to a specified maximum to be sent across the
network, but there are no guarantees in terms of cell loss rate and delay.
Compare with available bit rate (ABR), constant bit rate (CBR), and variable
bit rate (VBR). Compare with ABR (available bit rate), CBR, and
VBR.
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