[ntp:questions] Re: WLAN synchronization @ 10-100us

Magnus rovery78 at yahoo.com
Tue Dec 9 23:40:05 UTC 2003


Dale Worley <worley at dragon.ariadne.com> wrote in message news:<87d6aypvqw.fsf at netnews.comcast.net>...
> rovery78 at yahoo.com (Magnus) writes:
> > In a wired network this is possible by adding customized hardware that
> > inserts time-stamps in packets just before they reaches the physical
> > level of the stack.
> 
> I have no idea if this would work, but:  Since you're talking about
> customized hardware anyway, how about attaching a device to the server
> that broadcasts a pulse of some sort once a second (on some unlicensed
> frequency).  This pulse would be very simple, its only requirement is
> that it provide an accurate (within 10 us) indication of exactly when
> the "top of the second" is.  Then attach receivers of this pulse to
> the clients, and use the receiver's output as a PPS source for NTP.

It could be a possible solution if synchronizing over standard
communication protocol turnes out to be not an option. Does anyone
know if this has been done?

Magnus



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