Minimization of the accumulated phase change at the input of SDH/SONET desynchronizers

The minimization of jitter and wander in transmission systems such as SDH/SONET networks has received a great deal of attention. Minimization techniques which may be employed in the synchronizer, pointer processor, and desynchronizer have been proposed. At the input to a desynchronizer in a classical SDH/SONET network, a large peak-to-peak value of the accumulated phase change exists. This is primarily caused by gapped effects such as the 32/35 effect when the network is transporting a VC-12. After reviewing the jitter and wander causing components in an SDH/SONET network, this paper proposes and evaluates a method that compensates for the 32/35 effect. This new method reduces the peak-to-peak accumulated phase change by more than 50% in the VC-12 case. This same technique may be applied to SDH/SONET networks transporting other VCs