Re: [Linuxptp-users] ptp4l and SyncE

[Miroslav L. <mli...@re...>]

On Wed, May 02, 2018 at 06:58:56AM -0700, Richard Cochran wrote:
> On Tue, Apr 24, 2018 at 09:15:49AM +0200, Miroslav Lichvar wrote:
> > I have a pair of directly connected X550 cards, which behave a bit
> > like SyncE with the frequency. Their clocks seem to be locked to each
> > other or some other common source. I'm not sure how this works and I'd
> > love to see some explanation.
> 
> All gigabit link peers are synchronized.  There is a protocol that
> determines which peer is master.

Interesting. I assume that applies only to the PHY chip and the MAC
may be but doesn't have to be synchronized to the PHY? The X550 is the
only NIC I have noticed to have a "synchronized" PHC so far.

-- 
Miroslav Lichvar