Direct Attach Cable UBIQUITI UACC-DAC-QSFP28-0.5M 100G 0.5 m copper DAC

Ubiquiti UACC-DAC-QSFP28-0.5M is a 0.5 m direct attach copper cable with QSFP28 connectors rated for 100G data throughput. The cable provides a short-reach connection between compatible 100G switches, routers or network interface cards without needing optical transceivers. Its compact length and copper construction offer a cost-effective, low-latency link for dense server racks and top-of-rack installations.

Advantages

The Direct Attach Cable delivers native 100G performance with reduced power consumption compared to transceiver-based links, while eliminating the need for separate optics. The short 0.5 m length minimizes signal loss and latency for adjacent ports, and the QSFP28 connectors ensure mechanical compatibility with equipment that supports the QSFP28 interface. The copper DAC design simplifies installation and reduces overall cabling costs in high-density environments.

Suitable for

• Short-reach interconnects between 100G compatible switches and routers
• High-speed server-to-switch connections in data centers
• Top-of-rack or leaf-spine network topologies with adjacent ports
• Scenarios where low latency and reduced power/space are priorities

Key specifications

• Connector type: QSFP28 to QSFP28
• Length: 0.5 m
• Data rate: 100 Gigabit per second
• Medium: Copper direct attach cable (DAC)
• Typical application: Short-reach, point-to-point links in rack environments
• Form factor: Passive copper cable for adjacent port connections

How to use

Insert each QSFP28 connector into the corresponding 100G QSFP28 port on your switches, routers or NICs until the latch engages. Use the 0.5 m cable to connect adjacent ports within the same rack or immediately neighboring racks. No transceivers, additional modules or fiber patching are required. Verify link status on connected devices and ensure that the equipment firmware and port settings support passive DAC connections at 100G.

Recommendations

Keep the cable within recommended bend radius limits and avoid sharp kinks to maintain signal integrity. Use the 0.5 m DAC for short-distance connections only; for longer runs, select appropriate active cables or fiber optic solutions. Confirm compatibility with your equipment vendor's supported list for QSFP28 passive copper cables and monitor port temperature and link stability during initial deployment.