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"Computer Systems Network" Article "Computer Systems Network" artikel
Article Directory Home Artikel Directory Home Computer And Technology Computer og teknologi Computer Systems Network Edb-systemer, netværk

Running a Reliable Time Server Kører en pålidelig tid server

By Expert Author: Shipra Kaul Ved ekspert Forfatter: Shipra Kaul
View Summary | Submitted: 2008-05-12 | Word Count: 413 words | Views: 121 view(s) Vis Resumé | Forelagt: 2008-05-12 | Ordoptælling: 413 ord | Views: 121 se (s)
Shipra Kaul
The DV Station can also provide timing reference information to lower-stratum servers if needed. DV Station kan også give timing reference oplysninger til lavere stratum servere, hvis det er nødvendigt. For instance, one DV Station with its own GPS clock can act as a stratum-1 server for other machines on a LAN. For eksempel kan en DV Station med sin egen GPS-ur kan fungere som en stratum-1-server for andre maskiner på et 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. Eller en DV Station med henvisninger til en eller flere eksterne stratum-1 eller stratum-2 NTP-servere kan fungere som en stratum-2 eller stratum-3-server for andre maskiner på sin LAN, og så videre.

DV Stations equipped with the optional GPS receiver can directly receive timing reference information from the network of orbiting GPS satellites. DV Stationer udstyret med den valgfri GPS-modtager direkte kan modtage timing reference oplysninger fra netværket af kredser GPS-satellitter. 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. Til pålideligt modtage GPS-signalet er det vigtigt, GPS-antenne installeret på et sted med et klart og frit udsyn til himlen, ideelt set på en Tag. 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. Dette trin er kritisk, som forhindringer såsom naboens bygninger eller endog reflekterende vindue belægninger kan reducere signalstyrken til det punkt, at GPS-modtageren vil ikke fungere. The GPS antenna is connected to the GPS Ant TNC connector on the back panel of the DV Station. GPS-antenne er tilsluttet til GPS Ant TNC stik på bagpanelet af DV Station. All DV Stations that need to synchronize to the NTP clock are connected to each other via Ethernet. Alle DV Stationer, at behovet for at synkronisere til NTP-ur er forbundet med hinanden via Ethernet.

Running a reliable time server on the DV Station first requires a reliable source of timing GPS reference. Kører en pålidelig tid server på DV Station første kræver en pålidelig kilde til 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. Følgende procedure første kontrollerer, at timingen oplysninger fra GPS-modtageren kan anvendes af NTP daemon at opretholde DV Station's system ur inden for en meget lille forskydning fra den sande UTC tid. Use ping to make sure that the DVStation can communicate with the remote NTP server. Brug ping for at sikre, at DVStation kan kommunikere med fjernbetjeningen 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. Hvis ping rapporter om, at serveren's net er ikke tilgængelig, midlertidigt tilføje en standardgateway indrejse til DVStation routing-tabeller, der gør det muligt at bruge den lokale netværksforbindelse. 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. At undgå at skabe problemer for ansøgninger, der er afhængige af værdien af systemet låse til at gennemføre tællere, NTP daemon justerer værdien af de DVStation's systemuret meget langsomt. 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. Hvis den starter værdien af det system ur er for langt væk fra den sande UTC tid, NTP daemon vil nægte at justere det. 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. Derfor bruge ekstern NTP-server for at indstille DV Station's system ur til en tæt tilnærmelse af den sande UTC tid, og derefter genstarte dæmonen.

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. Kontrollere, at DVStation's system uret forbliver synkroniseret med fjernbetjeningen NTP-servere, helst en gang forskel på mindre end 128ms mellem server og klient er forpligtet til at opretholde NTP synkronisering. The typical accuracy on the Internet ranges from about 5ms to 100ms, possibly varying with network delays. Den typiske nøjagtighed på internettet varierer fra ca 5ms til 100ms, eventuelt varierende med netværket forsinkelser.
About the Author/Author Bio Om Forfatter / Author Bio

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

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