Re: [Linuxptp-users] grandmaster with an H/P 3805A GPS disciplined osc

[David G. <dav...@po...>]

On 08/20/2013 11:09 PM, Richard Cochran wrote:
> The PPS will give you the phase offset from the full second, and you
> can read the time and date from the serial port.


Richard,

I love this idea.  But being a newb, I don't understand how all the
parts work.  Could you walk me though this?

Conceptually, yes, I want to train the high-res clock of the i210 from
the radio.  And from that, or maybe in parallel with, train the system
clock.

First, I don't understand what phc2sys is used for.  If I'm running the
ptp4l daemon as a slave with free-running off, the daemon is setting and
training system clock, yes?  Or is it just the clock of the controller?

Now if I'm using ptp as a grandmaster, who trains the /dev/ptp0 and how?
 Or if I'm driving a PPS input at the comport's DCD line that NTPd is
using through its atom driver to /dev/pps0, is this managed by ptp4l for
slewing the card's clock?

Yeah, I'm lost.

-- 
David Gravereaux <dav...@po...>