Direct Attach Copper (DAC) Cable CBO DEM-CB100Q28-0.5 0.5 m QSFP28

CBO DEM-CB100Q28-0.5 is a 0.5 m Direct Attach Copper (DAC) cable fitted with QSFP28 connectors for short-reach, high-bandwidth interconnections. The cable provides a fixed electrical connection between QSFP28 ports on switches, routers and servers, enabling 100Gbps-class links with low latency and low power consumption compared with active optical solutions. Its short, pre-terminated design supports plug-and-play installation in rack-to-rack and intra-rack layouts in data centers and telecom environments.

Advantages

This DAC cable delivers a reliable, low-latency connection optimized for high-density networking equipment. The passive copper assembly eliminates the need for separate transceivers and reduces power draw and heat generation. With QSFP28 terminations it supports native 100Gbps signaling and interoperates with devices that accept QSFP28 electrical interfaces. The fixed-length, rugged construction simplifies cable management and reduces potential points of failure compared with field-terminated options.

Suitable for

• Short-reach connections between QSFP28 ports on switches and routers
• Server-to-switch links in rack and top-of-rack deployments
• High-density data center aggregation and spine-leaf fabrics
• Testing and staging environments requiring consistent electrical links

Key specifications

• Connector type: QSFP28 to QSFP28
• Length: 0.5 meter
• Data rate support: up to 100 Gbps (native QSFP28 electrical signaling)
• Cable medium: copper (direct attach passive)
• Form factor: pre-terminated fixed-length twinax assembly
• Typical use: short-reach, rack-to-rack and intra-rack interconnects

How to use

Install the DAC cable by inserting each QSFP28 connector into the corresponding port until the latch clicks. Ensure both devices are powered down or follow hot-plug procedures recommended by the equipment vendor. Verify link status on connected devices and confirm negotiated speed and lane configuration. For best signal integrity, avoid sharp bends and maintain recommended bend radius; route the cable along existing cable management channels to prevent strain on connectors.

Recommendations

Use this 0.5 m QSFP28 DAC cable for short-distance, high-throughput links within racks or between adjacent racks. Avoid extended outdoor exposure, excessive mechanical stress, and environments outside the specified temperature and humidity range of connected equipment. When replacing active transceivers with a DAC, confirm compatibility with the switch or server vendor and any firmware requirements.