The Cisco SFP‑H25G‑CU1M is an original 25GBASE‑CR1 SFP28 Passive Copper DAC (Direct Attach Copper) cable for Cisco switches, routers, servers, and storage systems. It supports data rates of up to 25 Gbps over a maximum distance of 1 m and uses a passive twinax copper cable for reliable short-range connections with minimal latency.

The cable is designed for use in data centers, enterprise networks, and high-performance computing environments, offering high reliability while maintaining low power consumption (no active chip). It supports hot-plugging and is compatible with a wide range of Cisco platforms that support SFP28 ports for 25GbE.