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    Re: Time and cel nav, a stupid question
    From: Dan Allen
    Date: 2008 Apr 22, 23:43 -0600

    It turns out my AT&T iPhone is slow as well!
    
    
    
    On Apr 22, 2008, at 5:07 PM, Fred Hebard  wrote:
    
    >
    > Dan,
    >
    > The Mac is fine.  It's the AT&T cell phone that's slow!
    >
    > Fred
    >
    > On Apr 22, 2008, at 6:52 PM, Dan Allen wrote:
    >
    >>
    >>
    >> On 22 Apr 2008, at 4:26 PM, Fred Hebard wrote:
    >>
    >>> On a Mac, using time.apple.com.  Just synced, and still about 50
    >>> seconds slow.
    >>
    >> That's very unusual.  I sync lots of Macs to time.apple.com and I am
    >> never off more than 10 or 20 milliseconds, according to the Mac
    >> Terminal command
    >>
    >>     ntpq -c peers
    >>
    >> which shows details of NTP servers and times.  I have tweaked my /
    >> etc/
    >> ntp.conf file so that I can query several different servers and NTP
    >> figures everything out.
    >>
    >> Here is a sample output of the ntpq -c peers command on my main Mac:
    >>
    >> ---
    >>
    >>      remote           refid      st t when poll reach   delay
    >> offset  jitter
    >> =
    >> =
    >> =
    >> =
    >> =
    >> =
    >> ===
    >> ===================================================================
    >> ==
    >> *clock.xmission. .GPS.            1 u  614 1024  377   24.369
    >> -8.786   6.633
    >> -time1.apple.com 17.106.100.13    2 u   19  256  377   38.468
    >> -5.278  34.007
    >> +time-b.nist.gov .ACTS.           1 u  419  256  376   88.355
    >> 8.279  27.296
    >> +tick.usno.navy. .USNO.           1 u  255  256  377   97.773
    >> 10.332  19.811
    >>
    >> ---
    >>
    >> It shows four different servers that I am checking in with.  The
    >> offset column is in ms and shows how far from those servers my
    >> machine
    >> is.  The delay column shows the distance in ms to these servers.  The
    >> jitter column combines errors in propagation along with absolute time
    >> errors to come up with an overall error figure, also in ms.
    >>
    >> Dan
    >>
    >>
    >>>
    >
    >
    >
    > >
    >
    
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