Hi, The basic definition of a stratum-1 time server is that it be directly linked (not over a network path) to a reliable source of UTC time such as GPS, WWV, or CDMA transmissions. A stratum-2 server is connected to the stratum-1 server OVER A NETWORK PATH. Thus, a stratum-2 server gets its time via NTP packet requests from a stratum-1 server. A stratum-3 server gets its time via NTP packet requests from a stratum-2 server, and so on. As you progress through different strata there are network delays involved that reduce the accuracy of the NTP server in relation to UTC. Timestamps generated by an EndRun Stratum 1 Time Server will typically have 10 microseconds accuracy to UTC. A stratum-2 server will have anywhere from 1/2 to 100 ms accuracy to UTC and each subsequent stratum layer (stratum-3, etc.) will add an additional 1/2-100 ms of inaccuracy.
quouted from http://www.endruntechnologies.com/stratum1.htm basically, if you have GPS receivier plugged into server - you are stratum 1 if you are not - you are 2 or higher 24.04.2012, в 1:11, IT2GO написал(а): > Dear, > > What does "stratum" exactly means? > I've set about 10 servers to the NTP pool, 8 of them has "stratum 2", one has > "stratum 3" and one became today "stratum 4". > Very strange, because that lasts server was "stratum 3". > > Kris > _______________________________________________ > pool mailing list > [email protected] > http://lists.ntp.org/listinfo/pool
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