Re: [Linuxptp-users] Help Needed about Transparent Clock

[Richard C. <ric...@gm...>]

On Tue, Apr 16, 2013 at 06:17:23PM +0000, Keller, Jacob E wrote:
> 
> As far as I know, it cannot. I believe TC also requires the same issue as BC which is multiple ports connected to a  single device?

Yes, however the TC only has to correct the residence time of the PTP
packets in the switch. So it would not necessarily have to synchronize
multiple PHCs in a system.

But there are other issues to consider. A TC must behave like a
switch. Although you can use Linux to bridge multiple ports, still the
performance is not as good as real switch. So I would expect that no
one would be interested in a TC built on a Linux software switch.

The commercial TCs that I have seen combine a normal managed switch
with an embedded processor. The switch diverts the PTP packets to the
processor which then performs the TC functions.

HTH,
Richard