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

[Zdeněk_Pala]

Let me correct the post above:
B5K does have two ports fixed 10G.
C5K does have two ports 1G/10G = dual speed. = http://learn.extremenetworks.com/rs/extreme/images/C-Series-DS.pdf

[Daniel_Coughlin]

The 10g ports on the C5/B5 platforms are fixed. S/K may support both 1g and 10g optics.

[Rich_Plummer]

I think that switch only supports 10GB

CHS-MDF-B5(su)->show port status tg.1.49 Alias Oper Admin Speed
Port (truncated) Status Status (bps) Duplex Type
--------- ------------ ------- ------- --------- ------- ------------
tg.1.49 CHS-MDF-710 Down Up 10G full SFP+

[Rich_Upshaw]

I was referring to his statement that he forced his server NIC to 10G. I'd let it autonegotiate.
Also, how do you force the B switch to 10G full?

[Rich_Upshaw]

I would let your NIC on the server autonegotiate first. It should negotiate at 10G.
I was going to tell you to force the port on the B5 to 10G but I'm not sure you can do that at that rate. I'm only seeing options for 1000.