[ntp:questions] Re: Generating a PPS output.
David J Taylor
david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk
Sat May 27 09:42:50 UTC 2006
Alexander Fisher wrote:
> I have an application where I'll have 2 PCs on an ethernet LAN. One
> of these will be fed a GPS PPS input and act as a level-1 NTP server.
> The other PC will be an NTP client. I need to get the client PC to
> output a PPS signal. The new PPS signal needs to match the original
> to within 1 ms. The LAN will be 100Mb/sec or better, won't contain
> many switches and will hopefully not be highly loaded.
> Many thanks,
It would obviously be far simpler to run a second PPS line from the
original PPS device, it's just RS-232 levels after all. I presume that
this is not possible for your environment?
There was a Microsoft research paper quoted here recently showing that a
specially configured NTP could get within (IIRC) a few tens of
microseconds for playing audio streams. Maybe some tips from that
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