Hi Rob,
Thanks for your explanation,
However i have modified the configuration using external clock source (sync
box), it seems work better, and the error message has gone. But another
problem comes out, after several minutes the application started, there is
an overload of LLLLLLLL message.
My best guess is probably my processor is not strong enough to run the app.
I will try to analyze further about it.
Thank you for your respond
Regards,
Harfan
On Tue, May 15, 2018, 23:06 ROBIN TORTORA <ti...@comcast.net> wrote:
> The second parameter to the set source is motherboard ID, so the sources
> are set on that motherboard as you have specified, but the board doesnt
> know if it is daisy chained or not, it just knows for that motherboard, use
> the external port as its source...
>
> On May 14, 2018 at 6:58 PM harfan ryanu via USRP-users <
> usrp-users@lists.ettus.com> wrote:
>
> Hi Robin and Marcus,
> Thanks for your reply earlier,
> I have read some thread saying we can still use daisy chain for 2 USRP,
> but the phase noise will get worse as the number of the device chained
> increase.
> I am just wondering if the function of set_clock_source_out and
> set_time_source_out is for daisy chain, probably i could be wrong.
> So i guess the only available option is by using external clock reference?
> Thank you very much
>
> Regards,
> Harfan
>
>
> On Mon, May 14, 2018, 23:15 Marcus D. Leech via USRP-users <
> usrp-users@lists.ettus.com> wrote:
>
> On 05/14/2018 09:04 AM, ROBIN TORTORA via USRP-users wrote:
>
> Split both your 1pps and 10MHz and then run cables off the splitter to
> each X310 separately using "equal length" cables and you should be "good
> enough", dont daisy chain :)
>
> I don't think the daisy-chain support was ever implemented, at least
> partially because it's not a wonderful idea in terms of added phase-noise,
> and added clock and 1PPS skew between the two devices.
>
>
> On May 14, 2018 at 4:28 AM harfan ryanu via USRP-users
> <usrp-users@lists.ettus.com> <usrp-users@lists.ettus.com> wrote:
>
> Hi All,
> I am building application with two USRP X310 configuration using daisy
> chain. When i try to synchronize both USRP using this :
>
> usrp.ptr->set_clock_source_out(true,0);usrp.ptr->set_time_source_out(true,0);usrp.ptr->set_clock_source("external",1);usrp.ptr->set_time_source("external",1);
>
> My configuration is the first usrp (with addr0 configuration 192.168.140.2)
> has an sma cable connected to the PPS Trig Out and Ref Out, while the other
> end of the sma cable is connected to second usrp (
>
> with addr1 configuration 192.168.40.2) through PPS Trig In and Ref In.
>
> I got an error message telling RuntimeError: Reference Clock PLL failed to
> lock to external source.
>
> I have explored some question in the past saying USRP x310 is not suitable
> for daisy chain and still in experimental however that thread is from 2014, i
> dont know if it is still valid.
>
> Could anyone help me to solve this problem?
>
> I am very grateful for any respond and help.
>
> Thank you very much,
>
>
> Regards,
>
> Harfan
>
> Sydney Uni
>
>
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