BlueLAN 40GBASE-CR4 QSFP to 4x10GBASE-CR SFP+ Passive Direct Attach Breakout Cable, 2m, AWG30, Compatible with Chelsio OCTTAPCABLE2M OCTTAPCABLE2M-BL

Aggregate 40 Gbps over four 10 Gbps lanes, delivered through a passive copper twinax breakout cable with QSFP on one end and four SFP+ connectors on the other. The BlueLAN OCTTAPCABLE2M-BL is a direct attach cable engineered for high-density data center interconnects, HPC clusters, and network storage environments where short-reach, low-latency links are required.

Overview

This 2-meter breakout cable connects a single QSFP port to four separate SFP+ ports, enabling flexible topology designs without active signal conditioning. Its passive design consumes no power and introduces minimal latency, making it ideal for top-of-rack switching and server aggregation. The AWG30 wire gauge balances flexibility with signal integrity over the 2-meter length, while the 100-ohm impedance ensures reliable transmission. The cable is hot-swappable and compliant with SFF-8436 (QSFP) and SFF-8431 (SFP+) standards, supporting Ethernet and InfiniBand protocols.

What stands out

• Aggregate data rate of 40 Gbps (4x 10 Gbps per lane)
• Passive copper twinax design – zero power consumption, ultra-low latency
• Breakout configuration: QSFP to 4x SFP+ for flexible port mapping
• 2-meter length with AWG30 wire gauge for easy routing
• Compatible alternative to Chelsio OCTTAPCABLE2M

Technical details

• Cable type: Direct Attach Cable (DAC), passive
• Connector A: QSFP (Quad Small Form-Factor Pluggable)
• Connector B: 4x SFP+ (Small Form-Factor Pluggable Plus)
• Data rate: 40 Gbps aggregate, 4x 10 Gbps per lane
• Length: 2 meters
• Wire gauge: AWG30
• Impedance: 100 Ohm
• Standard compliance: SFF-8436 (QSFP), SFF-8431 (SFP+)
• Protocol support: Ethernet, InfiniBand
• Hot-swappable: Yes
• Application: Data center interconnect, HPC, network storage

Our verdict

A reliable, power-free way to split a 40G QSFP port into four 10G SFP+ links over a short distance. The passive design and standard compliance make it a straightforward drop-in for compatible Chelsio environments.