Re: [Linuxptp-users] Hardware PTP clock synchronization

[Dale S. <dal...@gm...>]

Yeah, that's pretty much what I suspected.

A reason you want to use something like a vcxo, is so get get a really
clean clock for driving things like A2D converters.  It's important if you
are doing signal analysis.  A fixed frequency clock with pulse
addition/subtraction to get the right number of clocks edges per second
just doesn't cut it.

Thanks,
   -Dale




On Fri, Aug 2, 2013 at 4:16 PM, Keller, Jacob E <jac...@in...>wrote:

> On Fri, 2013-08-02 at 14:36 -0400, Dale Smith wrote:
> > On Fri, Aug 2, 2013 at 1:54 PM, Keller, Jacob E
> > <jac...@in...> wrote:
> >         Richard suggested the i210, and I also would recommend this
> >         part.
> >         Obviously I am somewhat biased as I am an Intel engineer.
> >         However this
> >         part definitely is better than the 82576 because it supports
> >         timestamping all packets (vastly reducing issues)
> >
> >
> > Something I'm unclear on after reading the i210 datasheets, is if it
> > is possible for it to use an external servoed vcxo or the like for the
> > 1588 clock, or does it only do the missing pulse / extra pulse thing
> > to adjust the 1588 clock frequency?
> >
> >
> > Thanks,
> >    -Dale
>
>
> I do not believe you can use an external servo to create the 1588 clock.
> You may, however, be able to use an external PPS signal and have that
> timestamped and software tune the onboard 1588 clock frequency.
>
> I don't know this for certain though.
>
> Thanks,
> Jake
>