About
Serve exact time for:
Welcome on site of wonderful project, we look forward to your visit!
Wonderful because in this place you can fast, freely and qualitatively get exact time, and if you want can start synchronisation from atomic reference clock.
Project started date 2015-03-20 14:49:22
Why need synchronise time?
All thing in any clock serve just two functions:
- Storage time
- Increment time every seconds to next second
Because in plain clock, seconds different between other, for some time, clock make offset from reference clock.
Similar between seconds, responds device with name “frequency generator”, his job make precision frequency.
The more precisely freq generator, then more precisely clock working.
In this moment, more precisely clock work based on atom cesium, that in lab ambient create very precision frequency, this clock offset on 1 sec occurred between one million years.
This type of clock not every country can buy.
But get time from this clock is possible through computer network.
About precission
Project service exact time, but, note, project is amateur and for this reason we not guaranteed high level of reliability, redundant and in some case precision.
We recommend use our servers with some 3th sources of exact time (for example other servers) (NTP algorithm in this case detect which server make offset and switch to another server).
We apply maximum for high quality service.
Why need exact time on computer?
Why not? Computer is calculate machine, more, decades people write books and movies about computers, so exact time is easy job for it.
In system administration one of most task, but not obvious is maintenance exact and synchronised time in (and between) all computer on corporate network with external world.
All task that user make via computer, demand exact time.
Some words about how it work
For synchronisation time between computers may use local or global network, this approach not need additional payment (if network already working).
Synchronisation can made through some protocols, most used on this moment is NTP and PTP. In our case, we use NTP, it can be easily configurable, not demand hardware supporting, and already tested by long time, for which he was used for embedded devices (CCTV, multimedia players, routers, switches etc).
NTP hold offset in range of one millisecond, and if server in near client, low latency make very precisely synchronisation process.
In NTP word, exist server Stratum 1 it connected to atomic clock (Stratum 0) by RS232 (COM), this port can delivery PPS signal without delaying. Through computer network to this (Stratum 1) server, connected next server with level Stratum 2 and distribute exact time to next by level (Stratum 3) servers, so to atomic clock has physical connection only server with level Stratum 1.
Than greater stratum on server, then larger offset compared with reference clock, but this difference very small, so in early not planned use hierarchy (each server include offset in time delivery). In some cases, access to server with stratum 1 for end client not permitted, recommendation for end user connect to stratum 2 and greater, if you distribute exact time for other, you can connect to server with stratum 1.
So for high precisely synchronisation, need more server with low latency.
Synchronisation algorithm performs next tasks: fixes clock runtime (increment or decrement microseconds in seconds) based on data arrived from exact time source, collect unique “fingerprint” accuracy of local frequency generator, collected data may be used for offline correction if connection with reference clock is terminated and so on.
What we aim to create the project
We want increase amount of exact time servers in Ukraine.
We use exact time in our others projects.
Especially this actually now, while computer and other devices require exact and synchronised time for all task that it perform.
And this is a just for fun!
About
- Список наших публичных серверов, с которых можно получить точное время руководствуясь инструкциями с этого раздела
- Благодарности, людям и проектам, которые тем или иным образом нам помогают
- Материалы и документация связанная с синхронизацией времени
- Помочь проекту, если он понравился и у вас есть возможность )
- Photo gallery of our hardware
Project under construction…
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