Understanding Jitter and Wander
Measurements and Standards
Abstract: This paper sets the scene for the following
papers on more detailed topics. It describes why jitter
measurements are important and the fundamental classes
of jitter and wander measurements.
Why jitter is important
Error free communications is something every user would
like to enjoy. Digital transmission, with its ability
to completely avoid cumulative noise-induced degradation,
should provide this. One reason for the digital reality
not meeting expectations is mis-timing inside transmission
equipment when data is regenerated. When mistiming becomes
large, errors are produced and the system can become
unusable. Even at low values of mis-timing, sensitivity
to amplitude and phase variations is increased and performance
suffers.
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