The SFP cable assemblies are high performance understanding the differences

SFP Cables (Mini-GBIC Cables) Factory Direct from Amphenol [15% OFF SALE] - Genuine Amphenol SFP cables offer an ultra-high performance, cost effective copper interface solution for gigabit speed applications in switched fabric I/O, switches, routers, data storage arrays, and high performance computer (HPC) clusters. All of our SFP cable feature Amphenol brand SFP cable for Twinax cables connectors for the most reliable connection possible.The Sealed SFP optical and electrical integrated assemblies are designed to maximize valuable space on the PCB while providing an environmentally rugged interface. Featuring a panel feed-through design, the assemblies incorporate an internally-mounted SFP cage and related electrical circuitry.
The SFP cable assemblies are high performance, cost effective I/O solutions for 10G Ethernet and 10G Fiber Channel applications.SFP copper modules allow hardware manufactures to achieve high port density,con-figurability and utilization at a very low Matching Products cast and reduced power budget. The high speed cable assemblies meet and exceed.I have two machines, each with a 10 Gb adapter, directly connected with an SFP cable. I purchased three SFP cable that look exactly alike (physically and specs), but only one works. I'm having trouble finding clear information about SFP cables, so I appreciate the help in understanding the differences.