Re: [Linuxptp-users] List of Boundary clocks

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

On Sun, Apr 14, 2013 at 04:33:36PM +0200, Mozhdeh Kamel wrote:
> I am totally getting confused regarding the hardware you introduced me. As
> what I found, these are reference design board.. I confused how I can use
> those.

Your question was...

   On Sun, Apr 14, 2013 at 02:35:11PM +0200, Mozhdeh Kamel wrote:
   > Can you please tell me the list of hardware which support both HW
   > timestamps and boundary clocks?

and the answer is that, as far as I know, only the Freescale boards
will work "out of the box" as a BC, with the Linux kernel and the
linuxptp stack. For example, the P2020RBD has three Ethernet ports.
It is a complete embedded computer, and so you could run ptp4l on the
three ports as a BC.
 
> I think you have read my scenario for testing IEEE1588 (bu using virtual
> machines and NIC). Before that, I thought I can have a proper network
> interface card that support hardware timestamps and use linuxptp  .. then I
> can have boundary clock and ordinary clock and etc .. Is it wrong? But with
> what you introduce.. I don't know how I can use it.

The important point is that a BC must have _two_or_more_ ports.
Just having one PCI card with HW time stamps is not enough. The BC
must have multiple ports all sharing the same clock.

If I understood your project idea, you are interested in the effects
of using PTP over BCs in a WAN, and you want to simulate different
kinds of network delay and jitter. In this case, I would recommend
just using a commercial BC. Getting you own home made BC working is a
whole project in itself.

HTH,
Richard