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NTP or Network Time Protocol servers are devices that connect to a computer network and all machines to synchronize with a single time source. Of course, most Windows operating systems have built a program called Windows NTP Time that can synchronize with an Internet time source, but can not be verified and a computer network open to abuse.
NTP servers are usually taken and 1U rack space, but some are built for smaller networks without a dedicated server room. NTP is based on UDP and requires TCP / IP.
The timing source for an NTP server can be taken from a specialist radio broadcast transmitted from national physics laboratories or from the GPS network.
Radio Time references only transmitted by a few countries, notably the U.S. (WWVB), UK (MSF), Germany (DCF), Japan (JJY), France (TDF), Switzerland (HBG) and China (BPM). However, depending on the distance of these broadcasts is possible to transmit signals in the neighboring countries, although mainly long wave signals that are easy to obtain blocked by mountains, buildings and bad weather.
If an NTP server is a location with a clear radio signal is possible to receive the broadcast in which an advantage over the GPS antenna and required a clear view of the sky (although it is possible to transfer one near a window received).
GPS is accurate than radio, the accuracy and within one hundred nanoseconds (a nanosecond is 1 billionth of one seconds). They can also be a signal from literally anywhere in the world (as long The antenna can get a clear picture of the Sky).
NTP servers are extremely easy to install and should only be provided with a static IP address and the internal time synchronized to have the external timing reference. Once synchronized (of up to one hours) the NTP server will continuously ensure all clocks on the network running the correct time.
Enhanced security options, such as authentication can also be used for the NTP server and the network is protected against abuse.