NTP Time Service

Structure

The first ukrainian registered Stratum One NTP Time Server is organized at Main Astronomical Observatory of the National Academy of Sciences of Ukraine (MAO NASU). The NTP Time Server of MAO NASU provides service in the transmission of signals of time with NTP-protocol. Service is free of charge.

The NTP (Network Time Protocol) is widely used to synchronize a computer to Internet time servers or other sources, such as a radio or satellite receiver, external standard of time and/or frequency. It provides accuracies typically better than a millisecond on LANs and up to a few milliseconds on WANs.

The NTP subnet operates with a hierarchy of levels, where each level is assigned a number called the stratum.

Stratum 1 (primary) servers at the lowest level are directly synchronized to external time services. The list of stratum 1 servers can be found at:
"http://support.ntp.org/bin/view/Servers/StratumOneTimeServers".

Stratum 2 (secondary) servers at the next higher level are synchronize to stratum 1 servers and so on. The list of stratum 2 servers can be found at:
"http://support.ntp.org/bin/view/Servers/StratumTwoTimeServers".

Normally, NTP clients and servers with a relatively small number of clients do not synchronize to public primary servers. There are several hundred public secondary servers operating at higher strata and are the preferred choice.

Detail information about NTP can be found at: "http://www.eecis.udel.edu/~mills/ntp/html/index.htm" and "http://www.ntp.org".

Information about NTP server of MAO NASU can be found at: "http://support.ntp.org/bin/view/Servers/NtpZeroMaoKievUa". Main characteristics of NTP server of MAO NASU are given follow:

Main characteristics of NTP server of MAO NASU

Stratum:	Stratum One
External Time Standarts:	passive rubidium standard of time (NTP v4, atom clock), GPS/GLONASS-receiver (NovAtel DL-V3 GPS/GLONASS receiver, NMEA clock driver)
Precision of signal transmission from the standard:	10-12sec
Guarantees precision of signal transmission :	10-3sec
Hostname:	ntp0.mao.kiev.ua
IP address:	194.44.35.24
OS:	linux 2.6.20 with linuxPPS patch
Equipment:	CPU: Celeron 660 MHz, RAM 64 Mb

Add next line "server ntp0.mao.kiev.ua" to your file "ntp.conf" for using information from NTP Time Service of MAO NASU.

The second ukrainian registered Stratum One NTP Time Server is organized at the National Scientific Center "Institute of Metrology". Detail information about NSC "IM" NTP can be found at: "http://www.metrology.kharkov.ua/rus/umc_time/user_manual01.shtml"