Cisco 10GBASE-CU SFP+ Direct Attach Copper Cable, Passive Twinax, SFP+ to SFP+, 1.5m, 10Gbps

The Cisco SFP-H10GB-CU1-5M= is a 1.5 m passive twinax direct attach copper cable with SFP+ connectors fixed to both ends, made for 10 Gigabit Ethernet links between Cisco switches, routers and servers in the same rack or across to the next one.

A DAC replaces two optical transceivers and a fibre patch cord with a single factory-terminated assembly: lower cost, negligible power draw and no fibre end-faces to clean. The trade-off is reach and flexibility — the length is fixed, and copper twinax is meant for links inside one rack or to the rack next to it.

• 1 × Cisco SFP-H10GB-CU1-5M= passive twinax cable, 1.5 m, with SFP+ connectors attached at both ends
• No separate transceivers are needed — the SFP+ connectors are part of the cable

• 1.5 m suits a top-of-rack switch to servers in the upper part of the rack, or switch-to-switch links within one rack.
• Passive copper draws at most 0.1 W, so it adds practically nothing to the port power budget.
• Hot-swappable: plug it in or pull it out while both devices are running; the port recognises the cable and brings the link up without separate optics.
• Measure the real cable route (through cable managers, around the rack posts) before choosing the length — a DAC cannot be shortened, and a long cable coiled inside the rack blocks airflow.

• It will not link in 1G-only SFP ports: both ends must be SFP+ (10G) ports.
• Non-Cisco switches or NICs that enforce their own coding may reject it — it is meant for the Cisco platforms in the compatibility matrix.
• It cannot be extended or joined to another cable — if the distance grows, the answer is optics plus fibre, not a second DAC.
• It is not a breakout cable: it connects one port to one port of the same type.