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Six GPS-based, fast, high-accuracy [10-nanosecond] Stratum-1 NTP Internet time servers that you can use for any timing needs, such as keeping your computer's clock synchronized to UTC, are available for public use. All six are equally accurate and are accessible via either of the two addresses given in the table below. |
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Server locations: Valencia, California [near Los Angeles]
For your computer, decide on a particular server line and then: For the PC (Windows XP): 1. Open the menu item 'Start > Control Panel > Date and Time'. 2. Click the 'Internet Time' tab. 3. Check the box next to "Automatically synchronize with an Internet time server" 4. Enter the Domain Name or IP Address from the table above as the server name. 5. Click 'Apply'. 6. Click 'Update Now'. 7. When you get the "Successfully" message, click OK. For the Macintosh (OS X): 1. Open 'System Preferences. . .' in the Apple menu. 2. In the 'System' bar, click 'Date & Time'. 3. In the window that opens, click the 'Date & Time' tab. 4. Check the box next to "Set date & time automatically" 5. Enter the Domain Name or IP Address from the table above as the server name. 6. Press the Return key. 7. Close the window. IMPORTANT: Be sure that the IP address of your client host computer is valid. The Internet has seven ranges of IP addresses that are not recognized by Internet routers or are not available for assignment: |
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Do not use an address in any of the above ranges to identify your computer to the outside world. A received IP address belonging to one of these ranges will be discarded by the servers. [If you connect to the Internet through a gateway in an organization's network, that is usually OK; in most cases local addresses will be temporarily converted to a valid number before being transmitted.] |
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Please note: The time derived from GPS by the servers is within a few nanoseconds of UTC; however, because of unpredictable transmission delays within the Internet, the time received from the servers will be accurate typically to a few milliseconds of UTC.
For questions or comments, e-mail x@sn.to This page was last updated on January 30, 2009. You are visitor number _ |
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