[time-nuts] Minor NTP Issue?

Russell Rezaian rrezaian at motorola.com
Mon Nov 1 16:51:36 UTC 2010


Hi Jason,

Not sure if you have checked this, but I have found that I can see 
100us or more of delta if the dedicated clock has not done a position 
average run, or has bad position information set.

So if you trust your 4501s to be providing the better time, you might 
want to look for other settings in the TS2100s in addition to cable 
delays.
--
Russell

At 11:05 AM -0500 2010/11/01, Jason Rabel wrote:
>I hope this doesn't get mangled too much via email... Below is an 
>output of "ntpq -p" on one machine.
>
>      remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
>*NET4501-1       .GPS.            1 u   36   64  377    0.724    0.022   0.100
>+NET4501-2       .GPS.            1 u   22   64  377    0.801    0.038   0.132
>+PRAECIS         .GPS.            1 u   14   64  377    0.740    0.097   0.034
>-TS2100-1        .GPS.            1 u   50   64  377    4.995   -0.362   0.030
>-TS2100-2        .GPS.            1 u   17   64  377    4.966   -0.331   0.035
>
>
>My two TS2100's always seem to be slightly "off" compared to my 
>other time servers... Even after I've had to power cycle all my
>equipment. Four of the five devices are currently on the same GPS 
>antenna and have more or less the same length of cable. Same four
>go to the same switch and such.
>
>Does a negative offset mean it is in the future? If so, I'm guessing 
>I need to dig and find an offset for cable delay (or similar)
>in the TS2100? I seem to recall that the standard package came with 
>50' or 150' of cable, but even that pre-factored delay wouldn't
>equate to ~300-400us would it?
>
>
>
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