Internet Protocol Performance Metrics
Framework for IP Performance Metrics (RFC 2330)
IPPM Metrics for Measuring Connectivity (RFC 2678)
A One-way Delay Metric for IPPM (RFC 2679)
One-way Packet Loss Metric for IPPM (RFC 2680)
A Round-trip Delay Metric for IPPM (RFC 2681)
Source: http://www.advanced.org/IPPM/docs.html