Article summarizes past and continuous development, and especially current state of Czech national research infrastructure for Clock Network Services and future development plans. The focus is on used transmission means and stabilization techniques, available and planned wavelength bands and also plans for geographic extensions.
The paper focuses on showing past, current and ready to start time and frequency (metrology) projects taking place in Europe aimed to long haul time and frequency transfers over optical fibers. It addresses both EURAMET and Horizon2020 projects’ scope. Focus will be given to Coordination and Support Action project CLOck NETwork Services (CLONETS) - Strategy and innovation for clock services over optical-fibre networks and proposed subsequent design study CLONETS-DS. Attention will be given also to effort of Research and Education Networks (NRENs) as pioneer network operators into this field.