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Results of evaluation of time signals received from NTP servers in Poland

Summarizing all the series of 24-hours and weekly tests, the authors observed some common tendencies. Neither the server stability nor the speed of generating responses were significantly affected by the fact whether a given test day was a working day or not. It was not confirmed that the server with the shortest time for generating responses is at the same time the most stable one. The influence of the stratum level of the server cannot be noticed, and sometimes a server with better stratum shows worse results. Statistically, the response times of servers are within the range of 100μs.