1ITU-T E.800.Terms and definitions related to quality of service and network performance including dependability，August 1994

　　2ITU-T P.10/G.100.Vocabulary for performance and quality of service，July 2006

　　3ITU-T Y.1540.Internet protocol data communication service-IP packet transfer and availability performance parameters，Nov、2007

　　4DSL Forum.www.dslforum.org

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