UBR

(Unspecified Bit Rate) An asynchronous transfer mode (ATM) level of service that does not guarantee available bandwidth. It is very efficient, but not used for critical data.

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UBR may refer to:

• Unspecified Bit Rate, a traffic contract used to guarantee quality of service for Asynchronous Transfer Mode networks
• Universal Broadband Router
• UDDI Business Registry
• Uniform Business Rate
• "U.B.R. (Unauthorized Biography of Rakim)", a song on the album Street's Disciple by Nas
• Unmatched Brutality Records

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