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05-Aug-2015 23:42

These are high-precision timekeeping devices such as atomic (cesium, rubidium) clocks, GPS clocks or other radio clocks.They generate a very accurate pulse per second signal that triggers an interrupt and timestamp on a connected computer.The upper limit for stratum is 15; stratum 16 is used to indicate that a device is unsynchronized.

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A server synchronized to a stratum n server will be running at stratum n 1.The number represents the distance from the reference clock and is used to prevent cyclical dependencies in the hierarchy.Stratum is not always an indication of quality or reliability; it is common to find stratum 3 time sources that are higher quality than other stratum 2 time sources.In 1979, network time synchronization technology was used in what was possibly the first public demonstration of Internet services running over a trans-Atlantic satellite network, at the National Computer Conference in New York.The technology was later described in the 1981 Internet Engineering Note (IEN) 173 and a public protocol was developed from it that was documented in RFC 778.

A server synchronized to a stratum n server will be running at stratum n 1.

The number represents the distance from the reference clock and is used to prevent cyclical dependencies in the hierarchy.

Stratum is not always an indication of quality or reliability; it is common to find stratum 3 time sources that are higher quality than other stratum 2 time sources.

In 1979, network time synchronization technology was used in what was possibly the first public demonstration of Internet services running over a trans-Atlantic satellite network, at the National Computer Conference in New York.

The technology was later described in the 1981 Internet Engineering Note (IEN) 173 and a public protocol was developed from it that was documented in RFC 778.

Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. NTP is intended to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC).