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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