[ntp:questions] demonstrate traceability to UTC

Unruh unruh-spam at physics.ubc.ca
Thu Mar 12 17:12:15 UTC 2009


Tom <tom_e_tek at hotmail.com> writes:

>To All,

>How do you demonstrate the traceability of the NTP solution to BIPM
>UTC?

That is what the stratum is all about. It tells you how far away your clock
is, in terms of servers, from some server which claims to synchronized by a
hardware type clock to UTC. The root dispersion is a conservative estimate
of how far off yo ucould be. 
Of course it is possible that your particular route is such that at its
base is a refclock which is someone looking at his $10 wristwatch. 
There is no guarentee that the stratum 1 source to which your machine can
trace its time is a good source, but if you have multiple sources, the
chances are high that that one will be regarded as a false ticker. 




>Tom R




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