Thank you for posting your question on the Mellanox Community.
Based on the information provided, unfortunately we do not support the cable in the current line of adapters. From a previous post, we noticed that you are using a ConnectX-2, also this adapter is not supported anymore as it is EOL and EOS.
For supported cables, please refer to the firmware RN of the ConnectX-5 EN -> http://www.mellanox.com/pdf/firmware/ConnectX5-FW-16_23_1020-release_notes.pdf
Thanks and regards,
~Mellanox Technical Support