Synchronization of telecommunication network using a Global Positioning Satellite

Summary form only given. The author discusses the methodology of AT&T's approach to synchronization of its telecommunication network using Global Positioning Satellite (GPS) receivers in its Primary Reference Clock (PRC) systems. Each PRC utilizes a triad of GPS and rubidium references along with special analysis software. The result is an ultrastable, verifiable, digital timing signal which is typically one hundred times better than the CCITT G.811 requirements. This system provides timing signals without having a track satellites continuously. Statistical processing of data using a triple point array of GPS and dual disciplineable rubidiums ensures stable output signals. The AT&T synchronization network thus operates plesiochronously, considering the multiple PRC sites located throughout the continental United States. However, these PRCs are all operating synchronously via the GPS satellite system.<>