QSFP28 DAC kabel BlueOptics QSFP28-DAC-2M-AT-BL 2 m samec/samec

The BlueOptics QSFP28-DAC-2M-AT-BL is a 2 meter passive direct-attach copper (DAC) cable with QSFP28 male connectors on both ends. Designed for short-reach 100G connections, this MSA-compliant twinax cable supports 100GBase-CR4 electrical signaling and is intended for linking switches, routers and servers inside racks or between adjacent racks. The cable uses 30 AWG twinax conductors and is suitable for data center and high-density networking environments where a compact, low-power 100 Gigabit connection is required.

Advantages

The cable provides a cost-effective, low-latency and low-power (passive) solution for short-distance 100G links without the need for separate transceivers. MSA compliance ensures broad interoperability with hardware platforms that support QSFP28 passive DACs. Construction with high-quality components and tested compatibility helps deliver stable signal transmission and long service life for typical data center use.

Suitable for

• Short-reach 100G connections between switches and top-of-rack devices
• Interconnects between adjacent racks in data centers
• Direct links to servers and storage systems that accept QSFP28 passive DACs
• High-density patching in aggregation and spine-leaf network architectures

Key specifications

• Connector type: QSFP28 male to QSFP28 male
• Length: 2 meters
• Cable type: Passive twinax copper (DAC)
• Supported protocol: 100GBase-CR4 electrical signaling
• Conductor gauge: 30 AWG twinax
• MSA compliance: QSFP28 DAC standard
• Typical applications: Ethernet, FCoE, Fibre Channel, InfiniBand up to 100 Gbps

How to use

Install the QSFP28-DAC-2M-AT-BL by inserting each QSFP28 connector into the corresponding QSFP28 port on your network devices until the latch engages. Confirm that both devices support passive QSFP28 DACs and the 100GBase-CR4 electrical interface. No additional power or configuration on the cable is required; link negotiation and lane settings are handled by the connected hardware. When removing the cable, release the connector latches and extract the cable straight out to avoid stress on the connectors or ports.

Recommendations

Use this passive 2 m QSFP28 DAC for short, rack-to-rack or within-rack 100G links only. Verify vendor compatibility with your switches, routers or servers before deployment and avoid routing the cable near high-heat sources or sharp bends to preserve signal integrity and mechanical life.