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 mailto: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> mailto: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 > > > > > > > > > > > > _______________________________________________ > > > > USRP-users mailing list > > > > USRP-users@lists.ettus.com > > > > mailto:USRP-users@lists.ettus.com > > > > > > > > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > > > > > > > > > > > > > > _______________________________________________ > > > USRP-users mailing list > > > USRP-users@lists.ettus.com mailto:USRP-users@lists.ettus.com > > > > > > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > > > > > _______________________________________________ > > USRP-users mailing list > > USRP-users@lists.ettus.com mailto:USRP-users@lists.ettus.com > > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > >
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