CLONETS-DS Clock Network Services-Design Study Strategy for clock services over optical-fibre networks

The precise time and frequency transmissions based on optical fibre have evolved recently. The time and frequency transfer methods by GSSN are becoming gradually obsolete, definitely providing lower measurements than we can do. Yet, we do struggle with the best effotrt to enable clock comparison, and to utilize the experience with the fibre. An optical clock, they will need to be connected to others, so the collaboration is essential. We present here the further development of infrastructure in mentioned research field. And the synergy of shared entities like QKD, relativistic geodesy, any industrial and societal applications within the shared fibre, where we have been focused on.