25GBASE-CR1 passive DAC — SFP28 to SFP28 copper twinax, not optical AOC
Cisco SFP-H25G-CU2.5M — 25G SFP28 passive Direct Attach Copper cable, 2.5 meter
Cisco Part Number: SFP-H25G-CU2.5M
Common aliases / related PIDs: SFP-H25G-CU2M · SFP-H25G-CU3M · SFP-H25G-CU1M · 25GBASE-CR1
Description: Passive SFP28-to-SFP28 twinax DAC for short-reach 25 Gigabit Ethernet (25GBASE-CR1)
This is a genuine Cisco 2.5-meter 25GBASE-CR1 passive copper DAC — SFP28 connectors on both ends, yellow pull tab per Cisco’s length color code. It bridges short inter-rack 25G links without optics, with near-zero power draw and ultra-low latency.
Important: Cisco requires BASE-R FEC (FC-FEC) on the host ports for 2.5 m and 3 m passive DACs. Confirm your Nexus/Catalyst software and port FEC settings before production cutover.
Lifetime warranty from Resilient Tec.