What the difference between packet delay variation and jitter ?

Dear Dominic,

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:

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.