(펌) http://www.paessler.com/knowledgebase/en/topic/18953-what-the-difference-between-packet-delay-variation-and-jitter
the OoS Sensor measures Jitter and Packet Delay Variation according to RFC 3550 and RFC 3393. Please see the IETF Website for exhaustive information.
In RFC 3393, please also see the section regarding terminology:
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1.1. Terminology
The variation in packet delay is sometimes called "jitter". This
term, however, causes confusion because it is used in different ways
by different groups of people.
"Jitter" commonly has two meanings: The first meaning is the
variation of a signal with respect to some clock signal, where the
arrival time of the signal is expected to coincide with the arrival
of the clock signal. This meaning is used with reference to
synchronous signals and might be used to measure the quality of
circuit emulation, for example. There is also a metric called
"wander" used in this context.
The second meaning has to do with the variation of a metric (e.g.,
delay) with respect to some reference metric (e.g., average delay or
minimum delay). This meaning is frequently used by computer
scientists and frequently (but not always) refers to variation in
delay.
In this document we will avoid the term "jitter" whenever possible
and stick to delay variation which is more precise. |