DAC cable CBO QSFP28-DAC-2M 2 m passive QSFP28 to QSFP28

CBO QSFP28-DAC-2M is a 2-meter passive direct attach copper (DAC) cable with QSFP28 connectors on both ends. It is intended for short-range 100G interconnects in data center environments and supports direct connections between switches, routers and servers without additional transceivers or external power. The cable provides a straightforward physical link for top-of-rack and rack-to-rack deployments where low latency and predictable signal performance are required.

Advantages

The passive QSFP28 to QSFP28 design reduces component count and simplifies installation by eliminating the need for separate optical transceivers. As a direct attach copper solution, this cable typically offers lower cost per link and lower latency compared with active optical alternatives for short distances. Its fixed 2 m length supports tidy cable management in rack environments and ensures consistent electrical performance for 100G connections.

Suitable for

• Short-reach 100G links between top-of-rack switches and aggregation switches
• Direct server-to-switch or server-to-router connections in dense rack deployments
• Patch or permanent links inside data center cabinets and equipment racks

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Passive direct attach copper (DAC)
• Nominal length: 2 m
• Data rate support: 100 Gigabit Ethernet (100G)
• Usage environment: Short-range, intra-rack and adjacent-rack connections

How to use

Install the cable by inserting each QSFP28 connector firmly into the corresponding QSFP28 port on the networking devices until the retention mechanism engages. Ensure devices are powered down or link negotiation is handled according to the equipment vendor guidance if hot-plugging is not supported. Verify link status and speed on connected devices after installation and organize the cable to avoid sharp bends or mechanical strain near the connector heads.

Recommendations

For reliable operation, avoid routing the cable next to high-EMI sources and maintain the specified bend radius. Use this passive 2 m QSFP28-DAC cable for short-distance 100G connections; for longer spans or requirements for optical isolation, consider active cables or optical transceivers with fiber cabling.