The 5071A Cesium Control Module (CCM) enables the Meridian II Precision TimeBase to discipline a 5071A Cesium Primary Frequency Standard to the GPS or UTC time scale. CCM combines the benefits of the Meridian II, 5071A, and EndRun’s Real-Time Ionospheric Corrections to provide a time and frequency standard with the accuracy, stability and holdover that resides at the uppermost echelon in the industry.