Today the Network Time Protocol (NTP) is widely used around the
world, to synchronize the computers and provide a very precise
time reference. NTP protocol supports an accuracy of time down to
nanoseconds but the real accuracy which can be achieved depends
on the operating system and the network performance.
NTP relies on a reference clock to define the most accurate time
and synchronizes all clocks on a network to that of the reference
clock. NTP uses Coordinated Universal Time (UTC) as the universal
standard for current time. UTC is independent of time zones and
enables NTP to be used anywhere in the world regardless of the
time zone settings.
An NTP time server is used to obtain the correct time from a time
source and adjust the local time in each participating computer.
The time source used by the time server is very important as this
forms the the basis of time updates across the whole network.
Recent studies show that the use of Internet time servers is not
recommended for industrial or commercial applications: there are
high numbers of bad clocks, unbalanced nature of the network
load, security reasons...
So it is essential to use an accurate auditable time source such
as a GPS source or an atomic clock.
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