[ntp:questions] frequency adjusting only

Maarten Wiltink maarten at kittensandcats.net
Mon May 12 14:03:11 UTC 2008


"Unruh" <unruh-spam at physics.ubc.ca> wrote in message
news:BK1Sj.3180$PM5.144 at edtnps92...

> [... Delay] assumed to be symmetric and is already cancelled. The
> ONLY way to really measure if there assymetry is to put a real clock
> on each of the machines (Ie, a clock synchronized to usec accuracy to
> UTC-- eg a GPS PPS ) and measure the offset of each of the machines
> from GPS time.

I wonder. Would it be possible to rig a PPS signal that isn't really
synchronised to anything, and distribute it to all the machines? It
wouldn't even need to use a very precise second.

(ISTR (possibly wrongly) that this was a single-lab setup. For a WAN
situation, it would be useless.)

Groetjes,
Maarten Wiltink





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