DAC cable CBO DEM-CB100Q28 100G QSFP28, 30 m

Direct Attach Copper (DAC) cable CBO DEM-CB100Q28 100G QSFP28, 30 m is a passive copper assembly with QSFP28 connectors that supports 100G data rates over a 30-meter channel. Intended for short-reach, high-bandwidth connections, this cable links switches, routers and servers in data center topologies and aggregation racks where reliable, low-latency copper connectivity is required.

Advantages

The cable delivers a low-latency electrical connection with no external transceivers required, reducing power consumption and simplifying deployment. Its QSFP28 interface provides compatibility with standard 100G ports, and the passive copper design offers predictable signal performance for short-reach interconnects. The fixed 30 m length helps maintain consistent link characteristics in aggregation and top-of-rack installations.

Suitable for

• Short-reach 100G links between switches and aggregation equipment
• Direct server-to-switch connections in data center racks
• High-bandwidth interconnects in top-of-rack and spine-leaf architectures
• Environments where low latency and reduced power draw are priorities

Key specifications

• Connector type: QSFP28 to QSFP28
• Data rate: 100 Gbit/s
• Cable type: Passive direct-attach copper (DAC)
• Length: 30 m
• Compatibility: Designed for 100G-capable ports and equipment supporting QSFP28 electrical interfaces
• Application: Short-reach, rack-level and aggregation links in data centers

How to use

Install the cable by inserting QSFP28 plugs into the corresponding 100G ports on networking equipment until the connectors latch. Ensure both ends are seated firmly and that the connected devices are configured to recognize a direct attach copper link. No separate optical transceivers or additional power are required. Verify link status in the devices' management interface and run any required diagnostics to confirm expected throughput and error rates.

Recommendations

Avoid tight bends and excessive pulling force; follow standard cable management practices to preserve signal integrity. Use this passive DAC for distances up to 30 m within racks and between adjacent racks; for longer or fiber runs, consider appropriate active copper or optical solutions. Verify compatibility with your switch or server vendor's supported transceiver/cable list before deployment.