Jitter and Wander in SyncE
Testing Jitter and Wander to ITU-T Standards
Though jitter and wander are closely related, their effects on networks and devices are quite different. Jitter directly causes bit errors at device inputs by the eye-closure mechanism.These bit errors then result in dropped packets. Wander does not impact the input stage but affects the ability of the internal clocking function to lock to and track the up-stream reference. Wander therefore impacts the distribution of clock references across networks.
This white paper has been written by Calnex, a Spirent technology partner, for engineers in the lab and those in the field who may not be familiar with the complexities of jitter and wander, and also to dispel some misunderstandings and avoid misinterpretation about measurement setup, implementation, and compliance to standards.