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Running a Reliable Time Server By Expert Author: Shipra Kaul
View Summary \| Submitted: 2008-05-12 \| Word Count: 413 words \| Views: 11 view(s)

The DV Station can also provide timing reference information to lower-stratum servers if needed. For instance, one DV Station with its own GPS clock can act as a stratum-1 server for other machines on a LAN. Or, a DV Station with pointers to one or more external stratum-1 or stratum-2 NTP servers can act as a stratum-2 or stratum-3 server for other machines on its LAN; and so on.

DV Stations equipped with the optional GPS receiver can directly receive timing reference information from the network of orbiting GPS satellites. To reliably receive the GPS signal it is important the GPS antenna installed in a location with a clear and unobstructed view of the sky, ideally on a rooftop. This step is critical, as obstacles such as neighboring buildings or even reflective window coatings can reduce the signal strength to the point that the GPS receiver will not work. The GPS antenna is connected to the GPS Ant TNC connector on the back panel of the DV Station. All DV Stations that need to synchronize to the NTP clock are connected to each other via Ethernet.

Running a reliable time server on the DV Station first requires a reliable source of timing GPS reference. The following procedure first verifies that the timing information obtained from the GPS receiver can be used by the NTP daemon to maintain the DV Station’s system clock within a very small offset from the true UTC time. Use ping to make sure that the DVStation can communicate with the remote NTP server. If ping reports that the server’s network is unreachable, temporarily add a default gateway entry to the DVStation’s routing tables, enabling it to use the local network connection. To avoid causing problems for applications which rely on the value of the system lock to implement timers, the NTP daemon adjusts the value of the DVStation’s system clock very slowly. If the starting value of the system clock is too far away from the true UTC time, the NTP daemon will refuse to adjust it. Therefore, use the external NTP server to set the DV Station’s system clock to a close approximation of the true UTC time, and then restart the daemon.

Verify that the DVStation’s system clock remains synchronised with the remote NTP servers, ideally a time difference of less than 128ms between server and client is required to maintain NTP synchronization. The typical accuracy on the Internet ranges from about 5ms to 100ms, possibly varying with network delays.

About the Author/Author Bio

www.atomic-clock.galleon.eu.com - NTP Time Server UK, Time Server, GPS NTP

Article Source: http://www.articlesphere.com/Article/Running-a-Reliable-Time-Server/139451

Article Tags: hardware, ntp time server, time server, gps ntp

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