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Definitions of unspecified bit rate:

does not guarantee any throughput levels. This is used for applications, such as file transfer, that can tolerate delays.
www.cites.uiuc.edu/glossary/
a type of traffic that is not considered time-critical (eg, ARP messages, pure data), allocated whatever bandwidth is available at any given time. UBR traffic is given a "best effort" priority in an ATM network with no guarantee of successful transmission.
www.e-ratecentral.com/resources/help/glossary/u.asp
Definition: UBR is an ATM service category, which does not specify traffic related service guarantees. Specifically, UBR does not include the notion of a per-connection-negotiated bandwidth. No commitments are made with respect to the cell loss ratio experienced by a UBR connection, or as to the cell transfer delay experienced by cells on the connection.
community.roxen.com/developers/idocs/rfc/rfc2761.html
A quality of service defined by the ATM Networks/ATM Forum, allowing any amount of data up to a set maximum to be sent across a network; non-time sensitive data that could be retransmitted without significant inconvenience. Does not guarantee freedom from delay or cell loss.
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