Hi, I just received an X410 and I am having trouble getting the 100Gb link to work. - On the workstation side, my NIC is an Intel E810 CQDA2 and I am using UHD-4.8 with Ubuntu 24.04 LTS - On the X410 side, I loaded the UHD-4.8 file system and the UC_200 FPGA image which implements 100Gb on SFP1. - Finally, I am using Fiberstore CWDM4 100Gb <https://www.fs.com/products/65219.html?now_cid=1159> optical transceivers with a duplex single-mode fiber. This item is my current suspected culprit - it's not clear to me whether the operation of this optical transceiver is transparent to the 100Gb port or if the port needs to handle things differently for this type of CWDM transceiver The problem is that I never even get link lights on the workstation NIC when I connect to the X410. However, if I move the QSFP28 transceiver from the X410 to another workstation (with a Mellanox 100Gb NIC), the link lights come right up on both sides and the OS sees a 100Gb Ethernet link. So, the problem "appears" to be that the X410 does not like this optical transceiver. Does anyone have any experience using this optical transceiver with the X410? Thanks. Rob

- On the workstation side, my NIC is an Intel E810 CQDA2 and I am
using UHD-4.8 with Ubuntu 24.04 LTS
- On the X410 side, I loaded the  UHD-4.8 file system and the UC_200
FPGA image which implements 100Gb on SFP1.
- Finally, I am using Fiberstore CWDM4 100Gb
<https://www.fs.com/products/65219.html?now_cid=1159> optical
transceivers with a duplex single-mode fiber.  This item is my current
suspected culprit - it's not clear to me whether the operation of this
optical transceiver is transparent to the 100Gb port or if the port needs
to handle things differently for this type of CWDM transceiver

Update. The optical transceiver model that I was using is labeled "QSFP-CWDM4-100G". I also have some older models "QSFP28-IR4-100G" which I believe are the same item (just with the model renamed at some point). In any case, if I use the IR4 model in the X410 with either the IR4 or the CWDM4 model in the workstation E810 NIC, it now works! So, the fact that the 2 different model names can talk to each other must imply that the technology (CWDM x4) is the same. And, the fact that the X410 is happy with the IR4 model means that it can handle this technology. I don't really have an explanation why the CWDM4 model does not work in the X410. Rob On Fri, Jun 20, 2025 at 4:19 PM Rob Kossler <rkossler@nd.edu> wrote: > Hi, > I just received an X410 and I am having trouble getting the 100Gb link to > work. > > - On the workstation side, my NIC is an Intel E810 CQDA2 and I am > using UHD-4.8 with Ubuntu 24.04 LTS > - On the X410 side, I loaded the UHD-4.8 file system and the UC_200 > FPGA image which implements 100Gb on SFP1. > - Finally, I am using Fiberstore CWDM4 100Gb > <https://www.fs.com/products/65219.html?now_cid=1159> optical > transceivers with a duplex single-mode fiber. This item is my current > suspected culprit - it's not clear to me whether the operation of this > optical transceiver is transparent to the 100Gb port or if the port needs > to handle things differently for this type of CWDM transceiver > > The problem is that I never even get link lights on the workstation NIC > when I connect to the X410. However, if I move the QSFP28 transceiver from > the X410 to another workstation (with a Mellanox 100Gb NIC), the link > lights come right up on both sides and the OS sees a 100Gb Ethernet link. > > So, the problem "appears" to be that the X410 does not like this optical > transceiver. Does anyone have any experience using this optical transceiver > with the X410? > > Thanks. > Rob >

- On the workstation side, my NIC is an Intel E810 CQDA2 and I am
using UHD-4.8 with Ubuntu 24.04 LTS
- On the X410 side, I loaded the  UHD-4.8 file system and the UC_200
FPGA image which implements 100Gb on SFP1.
- Finally, I am using Fiberstore CWDM4 100Gb
<https://www.fs.com/products/65219.html?now_cid=1159> optical
transceivers with a duplex single-mode fiber.  This item is my current
suspected culprit - it's not clear to me whether the operation of this
optical transceiver is transparent to the 100Gb port or if the port needs
to handle things differently for this type of CWDM transceiver

Hey Rob, thanks for getting back to us on the resolution. Yeah, we have seen issues with different (Q)SFP modules over the years -- not all work with USRPs. --M On Sat, Jun 21, 2025 at 12:22 AM Rob Kossler via USRP-users < usrp-users@lists.ettus.com> wrote: > Update. The optical transceiver model that I was using is labeled > "QSFP-CWDM4-100G". I also have some older models "QSFP28-IR4-100G" which I > believe are the same item (just with the model renamed at some point). In > any case, if I use the IR4 model in the X410 with either the IR4 or the > CWDM4 model in the workstation E810 NIC, it now works! So, the fact that > the 2 different model names can talk to each other must imply that the > technology (CWDM x4) is the same. And, the fact that the X410 is happy > with the IR4 model means that it can handle this technology. I don't > really have an explanation why the CWDM4 model does not work in the X410. > Rob > > On Fri, Jun 20, 2025 at 4:19 PM Rob Kossler <rkossler@nd.edu> wrote: > >> Hi, >> I just received an X410 and I am having trouble getting the 100Gb link to >> work. >> >> - On the workstation side, my NIC is an Intel E810 CQDA2 and I am >> using UHD-4.8 with Ubuntu 24.04 LTS >> - On the X410 side, I loaded the UHD-4.8 file system and the UC_200 >> FPGA image which implements 100Gb on SFP1. >> - Finally, I am using Fiberstore CWDM4 100Gb >> <https://www.fs.com/products/65219.html?now_cid=1159> optical >> transceivers with a duplex single-mode fiber. This item is my current >> suspected culprit - it's not clear to me whether the operation of this >> optical transceiver is transparent to the 100Gb port or if the port needs >> to handle things differently for this type of CWDM transceiver >> >> The problem is that I never even get link lights on the workstation NIC >> when I connect to the X410. However, if I move the QSFP28 transceiver from >> the X410 to another workstation (with a Mellanox 100Gb NIC), the link >> lights come right up on both sides and the OS sees a 100Gb Ethernet link. >> >> So, the problem "appears" to be that the X410 does not like this optical >> transceiver. Does anyone have any experience using this optical transceiver >> with the X410? >> >> Thanks. >> Rob >> > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-leave@lists.ettus.com >