DAC cable CBO QSFP28-DAC-0.5M 0.5 m passive direct attach, QSFP28 to QSFP28, 50 cm

The BlueOptics CBO QSFP28-DAC-0.5M is a passive direct-attach copper (DAC) cable with a 0.5 m length, engineered for QSFP28 ports. It provides a straightforward, low-latency electrical connection between compatible 100GbE devices such as switches, routers and network interface cards. As a short-reach interconnect, this 50 cm cable is intended for in-rack or adjacent-rack use where high-throughput and minimal latency are required while avoiding the higher power consumption and cost of active optical transceivers.

Advantages

This passive QSFP28 cable delivers reliable 100GbE connectivity with plug-and-play simplicity and no external power requirements. Its short copper link reduces latency compared with optical alternatives and supports high-density installations by keeping port configurations compact. The cable’s fixed length and integrated QSFP28 connectors simplify replacement and maintenance while offering a cost-effective option for short-distance data center interconnects.

Suitable for

• Short-range 100GbE connections within server racks
• Interconnects between adjacent racks in data centers
• Direct links between QSFP28 ports on switches, routers or NICs
• High-throughput, low-latency applications such as east-west traffic

Key specifications

• Connector type: QSFP28 to QSFP28
• Length: 0.5 m (50 cm)
• Cable type: Passive direct-attach copper (DAC)
• Supported data rate: 100GbE (QSFP28)
• Use case: Short-range, rack-level interconnect

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on your devices until the latch engages, ensuring a secure mechanical connection. No driver installation or external power is required; devices will negotiate link parameters automatically when supported. Use the cable for short runs within racks or between adjacent racks and verify link status via the device interface to confirm proper operation.

Recommendations

For reliable performance, avoid tight bends and excessive pulling on the cable. Keep the cable within recommended bend radius and ensure connectors are free of debris before insertion. Use this passive DAC for short-distance interconnects; for longer runs or fiber-based infrastructure, consider optical transceivers and fiber cabling.