CBO DAC cable X2121A-2M-N-BL QSFP direct attach, 30 m, BlueLAN

The CBO DAC cable X2121A-2M-N-BL QSFP direct attach, 30 m, BlueLAN is a shielded direct-attach copper (DAC) cable designed for QSFP ports. It provides a fixed, low-latency physical connection between compatible network devices in data centers and server rooms. The 30-meter length supports short-range links where QSFP direct-attach cabling is supported and simplifies rack-to-rack or switch-to-switch cabling by offering a single, shielded copper assembly that requires no separate transceivers.

Advantages

This shielded DAC cable delivers consistent signal integrity and reduced electromagnetic interference thanks to its shielding, making it suitable for dense installations. The cable offers low latency and predictable performance compared to optical transceivers with external modules, and it reduces power consumption by removing the need for separate optical transceivers. Its pre-terminated design ensures straightforward installation and reliable mechanical connection between QSFP ports.

Suitable for

• High-throughput short-range links between switches and routers in data centers
• Direct connections between servers and top-of-rack or spine switches
• Environments requiring low-latency, deterministic cabling
• Racks and equipment layouts where shielded copper cabling prevents EMI issues

Key specifications

• Connector type: QSFP direct-attach copper
• Cable length: 30 m
• Construction: Shielded copper assembly for reduced interference
• Latency: Low, fixed-link characteristics suitable for high-throughput applications
• Compatibility: Designed for devices with QSFP ports supporting direct-attach copper cabling

How to use

Install the cable by inserting each QSFP connector into the corresponding QSFP port on the network devices until the latch engages. Ensure both ends are fully seated and the cable is routed to avoid sharp bends and mechanical strain. Confirm the connected devices recognize the link and verify link status through device management interfaces or LEDs. For optimal performance, keep the cable away from high-power electrical sources when possible and follow the host equipment guidelines for QSFP direct-attach connections.

Recommendations

Use the shielded DAC cable for short-range, high-bandwidth links where QSFP direct-attach cabling is supported. Maintain proper bend radius, provide strain relief at patch points, and avoid exposing connectors to dust or contaminants when not in use.