OPTIME — Time and frequency dissemination system based on fiber optical network — Local repository project

The main goal of OPTIME project is to design and to create an infrastructure for a long range dissemination system for transfer of ultraprecise time scale and reference frequency signals in telecommunication networks. OPTIME dissemination system is based on three main elements: reference time and frequency laboratories, local time and frequency repositories and fiber optical network with specialized transmission equipment to transfers signals between laboratories, repositories and end-users. This article describes all elements of OPTIME system with particular emphasis on local time and frequency repositories. Moreover this article also describes experience gained during more than two years of experiments on fiber connection between Central Office of Measures (GUM) in Warsaw and the Astrogeodynamic Observatory (AOS) in Borowiec, which are reference laboratories in OPTIME system.