This MIB module defines objects that describe the a set of metrics used to measure the quality of a IP CBR traffic flow. An IP CBR traffic flow consists of a stream of IP datagrams sent from one application to another with a constant packet rate or bit rate. GLOSSARY ============ CBR - Constant Bit Rate. Delay Factor - the maximum observed value of the flow rate imbalance over a measurement interval. DF - Delay Factor. Flow Monitor - a hardware or software entity that classifies traffic flows, collects flow data, and periodically computes flow metrics. Flow Metric - a measurement that reflects the quality of a traffic flow. Measurement Interval - the length of time over which a flow monitor collects data related to a traffic flow, after which the flow monitor computes flow metrics using the collected data. Media Rate - the effective bit rate of the media content carried by a traffic flow. Media Rate Variation - a measure of loss (in bytes): N RT - sum [Si] i=1 MRV = RT where R is the nominal media rate, T is the measurement interval, Si is the size of packet[i] received during the measurement interval, and N is the number of media packets received during the measurement interval. MR - Media Rate. MRV - Media Rate Variation. Traffic Flow - a unidirectional stream of packets conforming to a classifier. For example, packets having a particular source IP address, destination IP address, protocol type, source port number, and destination port number. VB - Virtual Buffer. Virtual Buffer - a virtual buffer is a construct used to simulate a real buffer used by a media application for the purpose of storing media packets until the the application can render their content.