What is Stratum? The term “stratum” is referenced in both the network world and the telecommunications world.
Dr. David Mills, University of Delaware, is the author of the RFC 1305 that is NTP (Network Time Protocol). He developed a hierarchical structure in which Stratum 0 is the USNO clock. Stratum 1 is a radio receiver that receives the time from Stratum 0. Stratum 2 is a client that receives the time over a network connection from a Stratum 1 clock. Stratum 3 is a client that gets the time from Stratum 2… and so on to a theoretical Stratum 15. In the telecommunications world, stratum refers to the holdover performance of an oscillator in the event of loss of synchronization. Stratum 1, Stratum 2, Stratum 3, and Stratum 4 are the most typical. A Stratum 1 clock has an accuracy of 1.0 x 10-11, Stratum 2 has an accuracy of 1.6 x 10-8, Stratum 3 has an accuracy of 4.6 x 10-6, and Stratum 4 has an accuracy of 3.2 x 10-5. Back to Top GPS for Time & Frequency I thought GPS was for position. Does it supply time? Most definitely.
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