Cisco QSFP-100G-CU3M= 100GBASE-CR4 Passive Copper Cable, 3M | QSFP28

Move 100 GbE traffic across the rack without adding optical overhead. Cisco QSFP-100G-CU3M= is a 3 m passive copper cable for 100GBASE-CR4 direct attach connectivity, intended for compatible QSFP ports in dense enterprise and data center environments. The longer 3 m reach gives teams more routing flexibility than a 1 m assembly while preserving the simplicity of passive copper. That matters in real deployments: you can route around cable managers, cross a rack, or connect adjacent cabinets without introducing transceivers that add cost, heat, and inventory complexity. For short-distance 100 GbE, this is a practical way to keep the fabric clean and predictable. This cable is a strong fit when you want direct attach performance and a little more slack for installation tolerance. It helps standardize short-reach interconnects across switching, compute, and storage layers while keeping the bill of materials focused. For organizations that value dense cabling, lower power overhead, and fewer moving parts in the network path, the 3 m version offers the extra reach that often makes deployment easier.