Can you share the serial number of this network adapter? (located at the network adapter itself, containing three parts, 15 digits + 6 digits + 6 digits - xxx) Is this an OEM Dell NIC?
What is the 1000 LX device that you try to connected to?
I sent a PM to you also.
I'll send the Serial Number via PM.
The NIC is a Dell OEM part.
The remote side is an Omnitron Systems iConverter 10GXT with a genuine Omnitron LX optic.
We have also tested with a cheap HP switch and 3rd party optics - X710 won't work, X520 does.
As this is an OEM part from Dell, have you check with Dell also? What is the LR fiber you used for the XL710? Is it from Dell* supported fiber module?
There might be compatibility issue connecting to the device mentioned.
Have you check with the Omniron system vendor?