BlueLAN 40GBASE-CR4 QSFP to 4x 10GBASE-CR SFP+ Passive Direct Attach Breakout Cable, 2 m, AWG30, Centec Compatible CAB-Q-S-1M-CT-BL

Aggregate 40 Gbps over a single QSFP connector, fanned out to four 10 Gbps SFP+ links—this passive copper breakout cable is built for dense, high-speed data center interconnects. The BlueLAN CAB-Q-S-1M-CT-BL is a Centec-compatible direct attach breakout cable with a 2-meter reach and slim AWG30 twinax construction.

Overview

This cable connects a 40GBASE-CR4 QSFP port to four separate 10GBASE-CR SFP+ ports, eliminating the need for separate transceivers and reducing power consumption. It is a passive assembly, meaning it draws no power and relies on the host equipment for signal conditioning. The 2-meter length is ideal for top-of-rack to server or switch-to-switch connections within a rack or adjacent racks.

What stands out

• Aggregate 40 Gbps bandwidth with 4x 10 Gbps breakout
• Passive design: zero power draw, lower latency
• AWG30 thin twinax cable for improved airflow and cable management
• Hot-swappable QSFP and SFP+ connectors for easy maintenance
• Centec CAB-Q-S-1M-CT compatibility reference

Technical details

• Cable Type: Direct Attach Breakout Cable (DAC)
• Length: 2 meters
• Wire Gauge: AWG30
• Active/Passive: Passive
• Connector A: QSFP (40GBASE-CR4)
• Connector B: 4x SFP+ (10GBASE-CR)
• Media: Copper Twinax
• Protocol: Ethernet
• Application: Data Center, Network Interconnect, Server Connectivity

Our verdict

A straightforward, reliable passive breakout DAC for Centec environments. It delivers the expected 40G-to-4x10G fan-out without active electronics, keeping both cost and power low. The 2-meter length and thin gauge make it a practical choice for tidy rack deployments.