DAC cable CBO QSFP28-DAC-2M 2 m passive QSFP28 direct-attach copper

The CBO QSFP28-DAC-2M is a passive 2‑meter direct-attach copper (DAC) cable designed for QSFP28 ports. It provides a short-range, low-latency physical link for 100 Gigabit Ethernet and compatible connections without the need for optical transceivers. The cable is intended for high-density rack environments and top-of-rack connections where reduced power consumption and lower per-link cost are priorities.

Advantages

This passive DAC cable delivers low latency and low power consumption compared with active optical solutions, while offering a simple plug-and-play installation for QSFP28 interfaces. Its 2 m length suits short interconnects inside racks or between adjacent racks, enabling cost-effective 100GbE links with consistent electrical performance and minimal setup complexity.

Suitable for

• Top-of-rack (ToR) switch to server connections
• Switch-to-switch links within the same rack or adjacent racks
• High-density data centre interconnects where space and power are constrained
• Environments that require 100GbE or compatible direct copper connections without transceivers

Key specifications

• Cable type: Passive direct-attach copper (DAC)
• Connector format: QSFP28 to QSFP28 compatible
• Length: 2 meters
• Supported data rate: Designed for 100 Gigabit Ethernet and compatible standards
• Use case: Short-range, intra-rack or adjacent-rack connections

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on your devices until the latch engages. Ensure both ends are fully seated and that the host devices support passive DAC links at the intended data rate. No additional transceivers, optical modules, or power sources are required for standard passive operation. When removing the cable, release the connector latch before pulling to avoid damaging the port.

Recommendations

Verify compatibility with your switch or server vendor's QSFP28 port firmware and supported copper cable lists before deployment. Use this 2 m passive DAC for short-distance links inside racks or between adjacent racks; for longer runs or different power/latency profiles, consider active cables or optical transceivers.