![]() ![]() Enable varied network topographies, such as all of the slave clocks connecting to a single grand master timing reference or the grandmaster sending timing data to boundary clocks that then synchronize other slavesĪlthough the Global Positioning System is very accurate, it's not without problems.Reliably track time down to the nanosecond, or billionth of a second, and picosecond levels.Use an algorithm called best master clock, or BMC, to choose the fittest clock source from a range of candidates.Make up for latency introduced by local network conditions and correct timestamps to account for such delays.Such features give IEEE 1588-compliant devices the ability to: Why is time stamping important? These sequential records serve as references that can help quantify how much network latency exists between a grandmaster and a given slave clock. As a PTP grandmaster communicates with the clocks it's synchronizing, the information passing from one machine to the other gains a timestamp at each stop. Instead of clients requesting timing information, master clocks initiate contact by sending them data that they can use to stay in sync. By utilizing hardware-based timestamping, it provides more accurate synchronization. PTP, defined in IEEE 1588, facilitates applications where the NTP lacks sufficient accuracy. Since clients cannot obtain timing data from multiple sources or use MD5 checksums, they're vulnerable to general network inaccuracies and malicious agents that intentionally provide incorrect time stamps. The major difference is that SNTP is significantly less accurate. Permits peer-to-peer communication, broadcasting, multicasting, calibration and secure MD5 hash algorithmsĪnother variant of this protocol, known as SNTP or Simple Network Time Protocol, employs the same packet and message format.Uses a standardized, 64-bit UDP packet that can theoretically achieve picosecond (trillionth of a second) timing and determine dates within a 136-year range.Corrects for communication latency and individual clock drift.Lets clients connect to multiple NTP servers for data backups, heightened accuracy and testing purposes.Stratum 1 servers, also known as primary time servers, are connected directly to Stratum 0 devices as well as their same-level peers. ![]() The most accurate devices exist in Stratum 0, and they include atomic, radio and other high-precision clocks, such as those found in NIST laboratories and GPS satellites. ![]() The timekeeping servers in these networks are arranged in distinct strata, also known as layers. Although your hardware can ask for the present time from many different servers in the network, some devices provide more accurate data than others due to factors like system lag and latency. The NTP standard employs servers that supply clients, such as the computers in your network, with current Coordinated Universal Time, or UTC, information in response to individual requests. ![]()
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