On Mon, Nov 9, 2015 at 8:26 AM, Richard Cochran <[email protected]>
wrote:
> On Mon, Nov 09, 2015 at 07:29:02AM -0600, Bassam Alsanie wrote:
> > I have couple of questions.
> >
> > Can linuxptp and etherCAT coexist?
>
> Define "coexist".
>
etherCAT has its own software stack over the physical layer (mostly at the
data link layer), and I was wondering if I enabled the etherCAT on my
device, can the linuxptp run over etherCAT software stack? as the TCP/IP is
not necessary available when the etherCAT is enabled. Another question
would be, does the linuxptp run (and require) on specific OSI software
layer (such as TCP, UDP or IP)?
>
> > Regards the maximum frequency shift the clock can support, I have a case
> > that my custom ptp clock has maximum of 1000 ppm possible tune from the
> > center frequency. My question is, how the ptp algorithm deal with the
> cases
> > where it need to tune the clock beyond the maximum range?
>
> The maximum adjustment is a fundamental limitation of the clock, and
> there is nothing you can do about it. However, 1000 ppm is enough to
> tune most any clock, I would think.
>
> > Does it cause to
> > adjust the time again after the servo locked?
>
> -ENOPARSE;
>
> Thanks,
> Richard
>
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