Fiber connection from switch to server-No Link

[Rich_Plummer]

Hello Everyone,
I have an Enterasys B5K124-48P2 with a FTLX8571D3BCL-EX SR SFP+ module installed in port 49.
On the other end is a Lenovo 650 with an Intel x520 card and an Intel FTLX8571D3BCV-IT module.
I am using MM 50/125 Tripp Lite patch cable.

The switch recognizes the SFP and no issues jump out that I can see. The card in the server appears to be working fine as well. I did manually set the speed on the server card to 10GB instead of Auto.

Added bonus, I'm pretty new to Extreme/Enterasys and my knowledge of fiber is weak.

I'm not getting a link light between the two of them. Windows reports the cable is unplugged, and the switch is giving me "operator down".

Can anyone give me an idea as to what my next steps would be?
Thanks

[Roger_Green]

valid thought Rich...what is the fiber interface type...I would assume LX connectors, so switch pairs at the LIU

[Rich_Plummer]

LC

[Rich_Upshaw]

Roger, might he need to flip the A and B on the fiber strands? Just another thought.

[Roger_Green]

I disagree. auto speed/dupex rarely works. specify on both ends, switch and nic

[Daniel_Coughlin]

I stand corrected on the C5