[ntp:hackers] Re: The ATOM Driver.

David L. Mills mills at udel.edu
Sun Feb 19 04:24:18 UTC 2006


Terje,

Ouch. Some folks would like to fudge the PPS, which would not be hard, 
but you need to fudge it dynamically. I could put in an entry point for 
this, but that makes it hard to run multiple PPS/radios, and Iknow some 
guys that do that.

I can even test it here; I have two Spectracom radios hooked to two 
machines and a breakout box to lash them both to the same machine. This 
may be a topic for a summer intern.

Dave

Terje Mathisen wrote:

> John Hay wrote:
> > Some of the time sources use the serial stream and PPS signal as a 
> unit,
> > so much so that one cannot really work only with the serial stream (or
> > whatever way they send the date/time data). They work much the same as
> > the radio stations that will broadcast "When you hear the beep it will
> > be 7 o'clock..... beep". So without the beep there is no meaning to
> > whatever was said before that.
>
> It is even worse that that, in that at least the Oncore hw has to 
> output the (continously variable) negative sawtooth correction of the 
> PPS signal on the serial stream, i.e.:
> "When you hear the beep it will be 33 ns after 19:33:21 UTC...
>  When you hear the beep it will be 26 ns after 19:33:22 UTC...
>
> > So to handle this kind of thing, maybe one should be able to link a
> > specific instance of the atom driver to a specific instance of some
> > other driver, so that they work together. Maybe somewhat like one
> > could do with the old xntp version 3 code. There you could actually
> > call hooks in the atom driver from your own driver.
>
> Sounds like the best solution.
>
> Terje
>
> ------------------------------------------------------------------------
>
>
>
> ***********************************************************************
> NOTICE: This e-mail transmission, and any documents, files or previous
> e-mail messages attached to it, may contain confidential or privileged
> information. If you are not the intended recipient, or a person
> responsible for delivering it to the intended recipient, you are
> hereby notified that any disclosure, copying, distribution or use of
> any of the information contained in or attached to this message is
> STRICTLY PROHIBITED. If you have received this transmission in error,
> please immediately notify the sender and delete the e-mail and attached
> documents. Thank you.
> ***********************************************************************
>



More information about the hackers mailing list