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. |