Design of a Simulator for Investigating Organic Synchronization Systems

The problem of maintaining synchronism in a pulse code modulation network has been of interest for some time. One technique for synchronizing the geographically separated clocks of a network is known as organic synchronization. In this scheme, the frequency of each clock is controlled to maintain a phase lock between its signal and the average phase of signals arriving from other stations. The next article in this issue describes a design of such controls and also describes simulations that demonstrate the practicality of the technique. 1 This paper describes the analog simulator used in that work. The organic synchronizing method compensates the slow phase drift caused by discrepancies in the clock frequencies and the phase changes brought about by changes of transmission delays. The fast phase jitter introduced by changes in the P C M word patterns is not the concern of this study. 2 Therefore, in the simulator, it is convenient to use the cycles of a constant amplitude sinusoid to represent the 209