[ntp:questions] Linux NTPd using a older Trimble Thunderbolt GPS Receiver

Paul tik-tok at bodosom.net
Tue Jan 20 19:51:47 UTC 2015

On Tue, Jan 20, 2015 at 1:45 PM, William Unruh <unruh at invalid.ca> wrote:

>  You would presumeably want a daemon to read the clock and toggle the pin,
> perhaps with interrupts turned off

That would be NTPd refclock 29 mode N where N select an event stamping
receiver.  Naturally doing this in user space increases latency.  Someone
should look and see if this is better than PPS.

>  Not sure how long a pulse it requires.

At least one microsecond for the Acutime 2000 and probably similar for the
other devices.

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