Direct Attach Cable BlueOptics CBL-NTWK-0942-MQ28E30M 100GBASE-CR4 Copper DAC 3 m

Direct Attach Cable BlueOptics CBL-NTWK-0942-MQ28E30M 100GBASE-CR4 Copper DAC 3 m is a 3-meter passive copper twinaxial cable assembly engineered for 100GBASE-CR4 short-reach connections. The cable offers a direct electrical link between devices with QSFP28/CR4-compatible ports, delivering low-latency, fixed-length connectivity suited to dense rack-to-rack and switch-to-server topologies in data centers where predictable 100 Gbps links are required.

Advantages

The cable provides a cost-effective alternative to optical modules for short distances, with low power consumption and minimal signal conversion overhead. Its fixed 3 m length simplifies cabling planning and reduces clutter in patching aisles. Compatibility with QSFP28/CR4 ports ensures straightforward plug-and-play installation and stable electrical performance for high-throughput environments.

Suitable for

• Rack-to-rack interconnects in data centers
• Switch-to-server connections with QSFP28/CR4 ports
• Top-of-rack and spine-leaf architectures requiring 100 Gbps short-reach links
• Closely spaced equipment where fixed-length, low-latency links are preferred

Key specifications

• Standard: 100GBASE-CR4 electrical specification
• Connector type: QSFP28/CR4-compatible twinax connectors
• Length: 3 meters fixed
• Cable type: Passive copper twinax
• Data rate: 100 Gbps aggregate
• Latency: Low, direct electrical link (no optical conversion)

How to use

Insert each QSFP28/CR4-compatible connector into the corresponding port on the two devices to be connected, ensuring secure seating and that port release latches engage. Use the fixed 3 m length to map rack or equipment layout and avoid excess cable that could obstruct airflow. No additional configuration is required at the physical layer beyond verifying port settings and link negotiation on the devices. Follow device vendor guidance for port speed and lane configuration if manual adjustments are needed.

Usage recommendations

For reliable operation, use the cable within the specified rack and equipment spacing where 3 m is appropriate; avoid sharp bends and excessive mechanical stress near the connector boots. Verify that the connected ports support 100GBASE-CR4 or QSFP28 electrical interfaces and that firmware and drivers on both ends are up to date to ensure proper link negotiation and performance.