When using White Rabbit, the WR link does not appear to the OS; WR signal processing is handled directly in the FPGA, and made available to the OS / UHD via special commands. Or, that's what's supposed to happen. As of UHD 3.14.0.0rc1 WR does not work; we just recently found out this fact, and we are working hard to get the issue(s) resolved.
I've never used the Aurora FPGA image .. AA or AQ. From < https://files.ettus.com/manual/page_usrp_n3xx.html#n3xx_rh_sfp_protocols > it looks like AQ uses all 4 QSFP+ lanes, which between the actual Aurora protocol and using all 4 10 Gb lanes one should be able to get 40 Gb aggregate data ... literally bits in, bits out ... no ENET overhead! On Fri, Jun 4, 2021 at 4:43 PM Jason Matusiak <ja...@gardettoengineering.com> wrote: > Afternoon Michael! This is exactly the info I needed. I misspoke when I > said WX, I meant XQ. > > After putting the new image on, we knew the /data/ directory still had the > two sfp network setups, but we were expecting something in addition for the > qsfp. It makes sense that it doesn't //need// to change since we are only > using 2 lanes of one, or 2 lanes of the other. BUT, what I couldn't be 100% > sure of is since white rabbit needs Ethernet as well, why wouldn't THAT be > the sfp0 configuration, make sense? I'm not working the white rabbit side, > but I understand it to be ip based. > > Lastly. If we go the pure Aurora route, I know that we lose white rabbit, > but we gain a full 40Gbps, right? > > Thanks again. > On Jun 4, 2021, at 4:18 PM, Michael Dickens <michael.dick...@ettus.com> > wrote: >> >> Hi Jason - Answers, and more. I hope this is useful and helps clarify the >> options. - MLD >> >> 1) The N32x QSFP+ port/link/interface should work with UHD 3.15 via the >> XQ FPGA image. I haven't tried that in a while, but it did work for me once >> upon a time. >> >> 2) When using the WX FPGA image on any N3xy, you get just SFP+ port 1 for >> data, which is just a single 10 Gb link -- not the QSFP+ port (which is on >> the N32x only, by the way). If you use the XQ FPGA image with the N32x then >> you get 1x or 2x 10 Gb links via the QSFP+ port: lanes 0 and 1 (or 1 and 2 >> if you count lanes as 1's-based). In theory you could use 2x SFP+ 10 Gb >> links on a host NIC and aggregate them via fiber into a QSFP+ adapter >> attached to the USRP; I've never tried this directly, but I can say that >> taking QSFP+ off a host NIC and switching lanes works fine using the >> appropriate adapters and fiber cables and connectors. Just make sure that >> lanes 0 &/or 1 on the USRP side match up correctly with the other side >> coming in (whatever lane[s] you choose to use, so long as it/they are valid >> on the NIC). >> >> 3) When using the WX FPGA image with an N3xy, "ifconfig" will report back >> just "sfp1" as the 10 Gb data link that is connected to SFP+ port 1 on the >> USRP; not the QSFP+ port (which is, again, on just the N32x); this single >> link is set that up as you would any data link on a USRP and host. If you >> use the XQ FPGA image with an N32x, "ifconfig" will report back "sfp0" and >> "sfp1" as the 2 10 Gb data links, and you set those up just as you would if >> you were using the XG FPGA image. The FPGA maps between the data link (SFP+ >> or QSFP+) and the OS, so that the OS "sees" 1 or 2 10 Gb links; or that's >> how I understand this to work ... the end result is the same regardless of >> where the mapping happens :) >> >> >> On Fri, Jun 4, 2021 at 2:26 PM Jason Matusiak < >> ja...@gardettoengineering.com> wrote: >> >>> I have been away from USRPs for a while but am back to using some N3x0 >>> units and am having some issues. >>> >>> 1 - Does QSFP work with UHD 3.15? We'd prefer not to go up to v4 yet >>> due to some issues we've seen in testing it, but I am not sure how well >>> supported QSFP is on 3.15. >>> >>> 2 - When using the QSFP with White Rabbit (WX image), is it correct to >>> say that the QSFP link is really x2 10Gb links, not a single 20Gb? Meaning >>> that we would need a 40Gb QSFP that can handle 4 10G outputs, correct? >>> >>> 3 - Lastly, I cannot find any documentation on setting up the QSFP. >>> I've downloaded a new WX image over Mender, but I don't see where/how to >>> configure the QSFP. Is there an article or writeup anywhere that walks >>> through the steps? >>> >>> Thank you >>> _______________________________________________ >>> USRP-users mailing list -- usrp-users@lists.ettus.com >>> To unsubscribe send an email to usrp-users-le...@lists.ettus.com >>> >>
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