Summary

Amendment 1 to Recommendation ITU-T Y.1540 adds Appendix IX, which clarifies the Recommendation's status as a measurement method by comparing the TCP protocol to the requirements given in clause 6.12 of the Recommendation.

Readers of the Recommendation may find it useful to understand the implications of the normative requirements given in clause 6.12 when considering measurement methodologies, especially those based on available implementations of the TCP protocol. While TCP-based measurements are considered useful for informative surveys of user experience, they do not constitute the basis for standard metrics, methods of measurement or numerical objectives.