{"id":926,"date":"2010-08-07T16:03:39","date_gmt":"2010-08-07T16:03:39","guid":{"rendered":"https:\/\/www.galsys.co.uk\/news\/?p=926"},"modified":"2018-05-08T10:52:30","modified_gmt":"2018-05-08T10:52:30","slug":"how-accurate-does-ntp-synchronisation-need-to-be","status":"publish","type":"post","link":"https:\/\/www.galsys.co.uk\/news\/how-accurate-does-ntp-synchronisation-need-to-be\/","title":{"rendered":"How accurate does NTP Synchronisation need to be?"},"content":{"rendered":"

Computers advance at a remarkable rate; in effect computers double in power, speed and memory every five years, and with such advances in technology many people assume that the clocks that control the time of a computer are just as powerful.<\/p>\n

However, nothing could be further from the truth; most system clocks are crude crystal oscillators that are prone to drift, which is why computer time synchronisation<\/a> is so important.<\/p>\n

In modern computing, nearly every aspect of managing a network is reliant on time. Timestamps are the only frame of reference a computer has to ascertain if an event has occurred, is due to, or shouldn\u2019t occur.<\/p>\n

From debugging, to conducting time sensitive transactions over the internet, accurate time is essential. But how accurate does it have to be?<\/p>\n

Coordinated Universal Time<\/strong><\/p>\n

Coordinated Universal Time (UTC) is a global timescale derived from atomic clocks. UTC was developed to allow technological devices, such as computer networks, to communicate with a single time.<\/p>\n

Most computer networks use time servers governed by NTP<\/a> (Network Time Protocol) to distribute UTC across the network. For most applications, accuracy to within a few hundred milliseconds is sufficient \u2013 but achieving this accuracy is where the difficulty lies.<\/p>\n

Getting an accurate source of time<\/strong><\/p>\n

There are several options for synchronizing a network to UTC. Firstly, there is the internet. The internet is awash with time servers that proclaim to supply an accurate source of UTC. However, surveys of these online sources of time indicate that many of them are wholly inaccurate being seconds, minutes and even days out.<\/p>\n

And even the most accurate and respected sources from NIST<\/a> (National Institute of Standards and Time) and Microsoft, can vary depending on the distance your network is away.<\/p>\n

Dedicated Time servers<\/strong><\/p>\n

Dedicated NTP time servers<\/a> use a more direct approach to achieve accurate synchronisation. Using atomic clocks, either from the GPS satellite network or from physics laboratories (like NIST and the UKs NPL); the time is beamed directly to the NTP time server<\/a> that is connected to the network.<\/p>\n

Because dedicated devices like this receive the time directly from atomic clocks they are incredibly accurate, enabling the entire network to be synchronised to within just a few milliseconds of NTP.<\/p>\n","protected":false},"excerpt":{"rendered":"

Computers advance at a remarkable rate; in effect computers double in power, speed and memory every five years, and with such advances in technology many people assume that the clocks that control the time of a computer are just as powerful. However, nothing could be further from the truth; most system clocks are crude crystal…<\/p>\n

Continue reading <\/i><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,21,7,9,13],"tags":[204,29,30,206,80],"class_list":["post-926","post","type-post","status-publish","format-standard","hentry","category-atomic-clocks","category-gps-time-server","category-ntp-basics","category-ntp-server-2","category-time-synchronisation","tag-ntp-server-2","tag-ntp-servers","tag-ntp-time-server","tag-time-synchronisation","tag-time-synchronization"],"yoast_head":"\nHow accurate does NTP Synchronisation need to be? - Galleon Systems<\/title>\n<meta name=\"description\" content=\"Learn why we need NTP Synchronisation to be accurate all the time\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.galsys.co.uk\/news\/how-accurate-does-ntp-synchronisation-need-to-be\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How accurate does NTP Synchronisation need to be? 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