Cisco QSFP-4SFP10G-CU5M Compatible 40G QSFP+ to 4x 10G SFP+ Passive Breakout DAC — 5m (16ft)
Warranty: Lifetime
Turn one 40G QSFP+ port into four 10G SFP+ links — at 5 meters, for the rack next door
Cisco QSFP-4SFP10G-CU5M compatible — 40GBASE-CR4 QSFP+ to 4x 10GBASE-CU SFP+, passive copper, 5m
→ The switch port must support breakout. Before you buy, confirm the QSFP+ port on your switch can be split into 4x 10G in software. Not every 40G port can.
Compatible with: Cisco QSFP-4SFP10G-CU5M
SKU: QSFP-4SFP10G-CU5M
Description: Passive direct-attach copper breakout cable, QSFP+ (40GBASE-CR4) to four SFP+ (10GBASE-CU), 5 m
A breakout cable splits one 40G QSFP+ port into four independent 10G SFP+ connections. The usual use is a 40G switch port feeding four 10G servers, or a 40G port feeding a 10G switch.
This is a passive cable, so it draws almost no power and adds no optics. At 5 m it is the longest typical passive length for this cable type; past that, use optics or an active cable.
Which One Do I Need?
| Distance and need | Part |
|---|---|
| 40G port to four 10G ports, up to 5 m | QSFP-4SFP10G-CU5M — this listing |
| 10G SFP+ to SFP+, up to 3 m | Cisco SFP-H10GB-CU3M |
| 100G port to four 25G ports | QSFP-4SFP25G-CU1M — 100G to 4x 25G |
| 40G over fiber instead of copper | Cisco QSFP-40G-SR4 transceiver |
Technical Specifications
| Specification | Value |
|---|---|
| Compatible part number | Cisco QSFP-4SFP10G-CU5M |
| Ends | 1x QSFP+ (40GBASE-CR4) to 4x SFP+ (10GBASE-CU) |
| Aggregate data rate | 40 Gb/s (4 x 10 Gb/s) |
| Cable type | Passive twinax copper |
| Length | 5 m (16.4 ft) |
| Coding | Coded for Cisco |
| Condition | New |
| Warranty | Lifetime, backed by Resilient Tec |
Source: Cisco 40GBASE QSFP modules data sheet (Cisco) for the QSFP-4SFP10G-CU5M part definition.
Good to Know
- Breakout is a port setting. On most Cisco switches you enable 4x10G on the QSFP+ port in the configuration; the cable alone does not do it.
- Four ends, four ports. Each SFP+ leg is its own 10G link with its own port on the far side.
- Plan cable slack. A 5 m twinax breakout is thick and fairly stiff; route it before you lock down the rack.
Quick Checklist — Is This the Right Cable?
Your switch has a 40G QSFP+ port that supports 4x10G breakout. You are connecting four 10G SFP+ ports within about 5 m. You want passive copper rather than optics.
Availability
New, coded and tested · Ships from Resilient Tec in Knoxville, TN · Free standard shipping on US orders.
We confirm stock and lead time with you before an order ships. Need a different length or a different coding on each end? We can build it. Request a quote →
Warranty: lifetime, backed by Resilient Tec — not a manufacturer term. When something fails you reach a named seller in the US, not a ticket queue.
You Might Also Need
- Cisco QSFP-40G-SR4 — 40G over multimode fiber
- Cisco SFP-H10GB-CU3M — 10G to 10G copper
- Custom dual-coded DAC and AOC builds
Related Guides
Turn one 40G QSFP+ port into four 10G SFP+ links — at 5 meters, for the rack next door
Cisco QSFP-4SFP10G-CU5M compatible — 40GBASE-CR4 QSFP+ to 4x 10GBASE-CU SFP+, passive copper, 5m
→ The switch port must support breakout. Before you buy, confirm the QSFP+ port on your switch can be split into 4x 10G in software. Not every 40G port can.
Compatible with: Cisco QSFP-4SFP10G-CU5M
SKU: QSFP-4SFP10G-CU5M
Description: Passive direct-attach copper breakout cable, QSFP+ (40GBASE-CR4) to four SFP+ (10GBASE-CU), 5 m
A breakout cable splits one 40G QSFP+ port into four independent 10G SFP+ connections. The usual use is a 40G switch port feeding four 10G servers, or a 40G port feeding a 10G switch.
This is a passive cable, so it draws almost no power and adds no optics. At 5 m it is the longest typical passive length for this cable type; past that, use optics or an active cable.
Which One Do I Need?
| Distance and need | Part |
|---|---|
| 40G port to four 10G ports, up to 5 m | QSFP-4SFP10G-CU5M — this listing |
| 10G SFP+ to SFP+, up to 3 m | Cisco SFP-H10GB-CU3M |
| 100G port to four 25G ports | QSFP-4SFP25G-CU1M — 100G to 4x 25G |
| 40G over fiber instead of copper | Cisco QSFP-40G-SR4 transceiver |
Technical Specifications
| Specification | Value |
|---|---|
| Compatible part number | Cisco QSFP-4SFP10G-CU5M |
| Ends | 1x QSFP+ (40GBASE-CR4) to 4x SFP+ (10GBASE-CU) |
| Aggregate data rate | 40 Gb/s (4 x 10 Gb/s) |
| Cable type | Passive twinax copper |
| Length | 5 m (16.4 ft) |
| Coding | Coded for Cisco |
| Condition | New |
| Warranty | Lifetime, backed by Resilient Tec |
Source: Cisco 40GBASE QSFP modules data sheet (Cisco) for the QSFP-4SFP10G-CU5M part definition.
Good to Know
- Breakout is a port setting. On most Cisco switches you enable 4x10G on the QSFP+ port in the configuration; the cable alone does not do it.
- Four ends, four ports. Each SFP+ leg is its own 10G link with its own port on the far side.
- Plan cable slack. A 5 m twinax breakout is thick and fairly stiff; route it before you lock down the rack.
Quick Checklist — Is This the Right Cable?
Your switch has a 40G QSFP+ port that supports 4x10G breakout. You are connecting four 10G SFP+ ports within about 5 m. You want passive copper rather than optics.
Availability
New, coded and tested · Ships from Resilient Tec in Knoxville, TN · Free standard shipping on US orders.
We confirm stock and lead time with you before an order ships. Need a different length or a different coding on each end? We can build it. Request a quote →
Warranty: lifetime, backed by Resilient Tec — not a manufacturer term. When something fails you reach a named seller in the US, not a ticket queue.
You Might Also Need
- Cisco QSFP-40G-SR4 — 40G over multimode fiber
- Cisco SFP-H10GB-CU3M — 10G to 10G copper
- Custom dual-coded DAC and AOC builds