BlueLAN Compatible Allied Telesis AT-QSFP-4SFP10G-2CU Passive 40GBASE-CR4 QSFP to 4x10GBASE-CR SFP+ Direct Attach Breakout Cable, 2m, AWG30 AT-QSFP-4SFP10G-2CU-BL

In high-density data centers and enterprise server rooms, network engineers often need to connect a 40G QSFP port to four separate 10G SFP+ ports. The BlueLAN AT-QSFP-4SFP10G-2CU-BL passive breakout cable does exactly that, linking an Allied Telesis switch or NIC to multiple downstream devices over a single 2-meter assembly.

Key specifications

• Connector A: QSFP (40GBASE-CR4)
• Connector B: 4x SFP+ (10GBASE-CR)
• Aggregate data rate: 40 Gbps (4x 10 Gbps lanes)
• Cable type: Passive Direct Attach Copper (DAC)
• Length: 2 meters
• Wire gauge: AWG30
• Impedance: 100 Ohm
• Protocol: Ethernet
• Hot-pluggable: Yes
• Compatibility: Allied Telesis AT-QSFP-4SFP10G-2CU equivalent

Why choose it

This breakout cable eliminates the need for separate optical transceivers and fiber patch cords, reducing cost and power consumption for short-reach 40G-to-10G connections. Its passive design draws no additional power and introduces near-zero latency, making it ideal for latency-sensitive applications.

Ideal use cases

• Connecting a 40G QSFP switch port to four 10G SFP+ server NICs
• Linking a 40G uplink to multiple 10G top-of-rack switches
• High-performance computing clusters requiring dense, short-reach interconnects

Good to know

The cable is built with AWG30 copper conductors for flexibility and easy routing in tight racks. It is fully compliant with the 40GBASE-CR4 and 10GBASE-CR standards and is hot-pluggable for quick installation or replacement.