Summary

Recommendation ITU-T Y.1543 specifies a set of Internet protocol (IP) performance parameters and methods of measurement applicable when assessing the quality of packet transfer on inter-domain paths. The methods anticipate that there will be multiple measurement systems, each conducting measurements of a segment of the customer-to-customer path, and recommend configurations that should produce useful results in this cooperative scenario. The methods rely on existing parameter definitions and encompass both active and passive measurement techniques. Recommendation ITU-T Y.1543 also specifies requirements for trustworthy IP quality of service (QoS) monitoring, to ensure that results have a foundation in scientific method where sources of error are quantified. Thus, meaningful discussions of network QoS between users and service providers (SPs) are most relevant when based on measurements at measurement points (MPs) that correspond to the demarcation points (DPs) of the service agreement.