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    Re: Problem with Time-Server from NIST
    From: Lu Abel
    Date: 2011 Apr 8, 11:02 -0700
    Marcel:

    When your web browser was displaying the incorrect time, what did it show for "time accurate to..."  ??

    Recently I had unhooked my DSL modem from my computer and, forgetting that I was unhooked, fired up the NIST server.   When I didn't see the display I realized I was disconnected and re-connected.   I got an incorrect time -- but the "accurate to" display said something like "accurate to 30 seconds"  (that round-trip delay measurement got sidetracked by the unplugged cable).

    As I understand it, NIST measures the round-trip delay to your computer and then advances the time display by half the measured amount to compensate for the travel display. 

    Your internet provider may just have had a hiccup that day.

    Lu



    From: Marcel Tschudin <marcel.e.tschudin---.com>
    To: NavList@fer3.com
    Sent: Fri, April 8, 2011 5:30:54 AM
    Subject: [NavList] Re: Problem with Time-Server from NIST

    After some further testing: The time shown on the Web-interface corresponds now again with the synchronised computer clock. In between the difference reduced from 2s to 1s. It appears to me that the time shown on http://nist.time.gov/timezone.cgi?UTC/s/0/java doesn't seem to be reliable.

    Marcel
       
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