Přenos času a frekvence v lokálních sítích

Abstract

This dissertation thesis deals with these topics: network protocols for time distribution, time transfer over optical bers, comparison of atomic clocks timescales and network time services. The need for precise time and frequency synchronization between devices with microsecond or better accuracy is nowadays challenging task form both scientic and engineering point of view. Precise time is also the base of global navigation system (e.g. GPS) and modern telecommunications. There are also new elds of precise time application e.g. nance and high frequency trading. The objective is achieved by two dierent approaches: precise time and frequency transfer in optical bers and network time protocols. Theoretical background and state-of-the-art is described: time and clocks, overview of network time protocols, time and frequency transfer in optical bers and measurements of time intervals. The main results of our research is presented: IEEE 1588 timestamper, atomic clock comparison, architectures for precise time measurements, running processor on external frequency, long distance evaluation of IEEE 1588 performance and time services in CESNET network. At the end is mentioned the ongoing and proposed work.This dissertation thesis deals with these topics: network protocols for time distribution, time transfer over optical bers, comparison of atomic clocks timescales and network time services. The need for precise time and frequency synchronization between devices with microsecond or better accuracy is nowadays challenging task form both scientic and engineering point of view. Precise time is also the base of global navigation system (e.g. GPS) and modern telecommunications. There are also new elds of precise time application e.g. nance and high frequency trading. The objective is achieved by two dierent approaches: precise time and frequency transfer in optical bers and network time protocols. Theoretical background and state-of-the-art is described: time and clocks, overview of network time protocols, time and frequency transfer in optical bers and measurements of time intervals. The main results of our research is presented: IEEE 1588 timestamper, atomic clock comparison, architectures for precise time measurements, running processor on external frequency, long distance evaluation of IEEE 1588 performance and time services in CESNET network. At the end is mentioned the ongoing and proposed work.