
I'm giving 4 stars because I'm not entirely sure if the modules are to blame, it could be an incompatibility or other hardware related to my setup. working after several transplants, maybe i did something to get them working but i'm not sure what it was at the moment. I use the same module on both ends. 1 on my Mikrotik CRS317 and 1 on my Mellanox ConnectX-3 (Dell OEM if that matters) connected with a 75ft Cat7 cable. I've given up trying to figure out what the problem was. There is, and I hope it will work until I can isolate another solution. I guess I'll keep them, just frustrated because they work fine, until I remove and put them back. Will update my review if there are further developments. I would recommend using fiber optic or DAC cables instead unless copper is required in your situation (in my case it is).

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