The ZL30130 SONET/SDH/GbE Stratum 2/3E/3 System Synchronizer and SETS device is a highly integrated device that provides all of the functionality that is required for a central timing card in carrier grade network equipment. The basic functions of a central timing card include: • Input reference monitoring for both frequency accuracy and phase irregularities • Automatic input reference selection • Support of both external timing and line timing modes • Hitless reference switching • Wander and jitter filtering • Optional Input phase transient filtering (Stratum 3E phase build-out) • Master/slave crossover for minimizing phase alignment between redundant timing cards • Independent derived output timing path for support of the SETS functionality Click here for secure documentation