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Stratum 1 GPS-Referenced NTP Time Servers

GPS is generally associated with navigation. Less well known is the fact that it can also provide a very accurate source of time. Much of the internet is synchronized by GPS based time servers using the network time protocol (NTP). GPS Network Time Protocol servers utilize the Global Positioning System to provide the internet with […]

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Using the GPS System For Accurate Time

GPS is a satellite based Global Positioning System used to provide navigation and precise positioning information to users on the Earth. The system was developed and is operated by the US military (DoD), but is also made available for civilian use, with some restrictions. Some high-end GPS receivers have export restrictions applied by the US […]

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Leap Seconds and the Network Time Protocol

The international standard of time is Coordinated Universal Time (UTC), which is used in countries around the world almost exclusively as the basis of civil time. UTC is derived from atomic clocks located in the National Physics Laboratories of various countries and is based on the international definition of the second. However, the Earth takes […]

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LINUX NTP Servers

A Linux NTP Server provides an accurate time resource for the synchronisation of a network of computers and other network infrastructure. A stratum 1 server obtains accurate time from a hardware clock reference such as GPS or radio and is used to synchronise other servers lower down the stratum hierarchy. It is generally accepted that […]

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Atomic Clock Time Synchronisation

This article discusses a number of aspects associated with Atomic Clock time references and specifically their use in computer systems and network time synchronisation. Topics covered: What is an Atomic Clock? National Time and Frequency Radio Broadcasts Time and the Global Positioning System The Galileo GNSS System Synchronising Computer Systems and Networks What is an […]

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Time Synchronisation For Computer Networks

TimeTools provides a wide range of PC time synchronisation devices based on GPS and radio atomic clock technology that can ensure reliable accurate time on Microsoft Windows 7, 2008 R2, XP, VMware or Linux/Unix machines. We also provide dedicated network time servers that can ensure the correct time on a large number of network time […]

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GPS Referenced NTP Server Solutions For Network Timing Applications

GPS referenced network time servers utilise the global positioning system to obtain very precise time for computer network time synchronization purposes. The GPS system is an US military system monitored by the U.S. Naval Observatory (USNO) and is primarily used for navigation purposes. The system consists of a constellation of 24 orbiting satellites. Each satellite […]

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Configuring a Windows Time Server

With the introduction of Windows 2000, Microsoft adopted a time synchronisation service – Windows Time. The service continued in Server 2003, right up to the latest Windows Server 2008 operating systems. The service is installed by default in the service list, the executable file is called w32time.exe and is stored in the windows/system32 directory. This […]

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Installing a NTP Time Server

NTP is an abbreviation of Network Time Protocol, which is a standard internet protocol that was established over twenty years ago. NTP time servers are network appliances that are designed to disseminate accurate time to client computers and network infrastructure for synchronisation purposes. This article provides a brief overview on a number of topics associated […]

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The Difference Between NTP and SNTP

Network Time Protocol is an internet protocol used for the dissemination of accurate time around the internet and computer networks. It is a client-server based protocol, clients request accurate time from a server and the server responds accordingly. Many complex algorithms were developed for NTP to enable more accurate time synchronisation and to alleviate drift. […]

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