Re: [Linuxptp-users] List of Boundary clocks

[Mozhdeh K. <kam...@gm...>]

Thank you so much for your answers.

So, by having a real BC, and those NICS (such as Intel's 82576 chip or Intel
82574 ) with linuxptp can I emulate the network?
It is written in linuxptp readme that it implements the boundary clock, is
it means by having a real BC and connect it to the linux which has
linuxptp, it will recognize it and can be a slave for it?


Mozhdeh

On Mon, Apr 15, 2013 at 6:17 PM, Richard Cochran
<ric...@gm...>wrote:

> 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
>