[ntp:questions] Re: Generating a PPS output.
Richard B. Gilbert
rgilbert88 at comcast.net
Sat May 27 14:41:51 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.
> The intention is that both systems run Linux.
> Has anybody here attempted this before? I'm guessing that in a
> controlled environment NTP can be accurate enough for this?
> What about generating the PPS output? I'm thinking about using
> something like RTAI.
> This article ...
> describes how to control the parallel port pins in a deterministic way.
> Does this look like a good way forward? Any advice?
> Many thanks,
> questions mailing list
> questions at lists.ntp.isc.org
I think it might be considerably simpler and easier to feed the original
PPS signal to a buffer or line driver and feed the output of that to
everything that needs a PPS signal
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