[ntp:questions] Advice for a (LAN-interconnected) WLAN Testbed w/ ARM nodes
David L. Mills
mills at udel.edu
Wed Aug 4 02:31:22 UTC 2010
May I suggest you review the definitions of system offset (THETA), root
distance (LAMBDA) and system jitter (PSI) in Section 11.2 of rfc5905.
David Woolley wrote:
> Miroslav Lichvar wrote:
>> But there will be more clock updates. Noise in frequency may go up,
>> but the offset will be the same or better, unless there are network
>> congestions that last longer than the clock filter can handle (8 *
>> poll interval).
> The "offset" may be better, but offset is not the offset from true
> time, it is the offset from the sum of the upstream server time and
> the measurement errors for the last poll. There should be no way of
> measuring the error from UTC. The fact that you can do so, to some
> extent, is due to the NTP algorithms being less than ideal.
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