BlueOptics QSFP56 Direct Attach Cable 200GBASE-CR4, 30AWG, 3m

BlueOptics QSFP56 Direct Attach Cable 200GBASE-CR4, 30AWG, 3m is a copper twinax cable assembly with QSFP56 terminations designed for 200 Gbit/s short-reach Ethernet links. The 3-meter length and 30AWG conductors make it suitable for high-density data centre topologies where reliable, low-latency server, switch and storage interconnects are required. This cable implements the 200GBASE-CR4 electrical interface and is intended for direct attach connections between compatible QSFP56 ports.

Advantages

The cable offers a compact, low-power alternative to optical transceivers for short-distance links, enabling dense port-to-port connections with minimal footprint. Copper twinax construction and QSFP56 terminations deliver full 200 Gbit/s aggregated bandwidth with low latency and predictable signal integrity. The fixed 3 m length simplifies rack planning and reduces the need for intermediate patching when connecting adjacent equipment.

Suitable for

• Short-reach interconnection between servers, switches and storage within the same rack or neighbouring racks
• High-density data centre top-of-rack and spine-leaf fabrics requiring 200G links
• Low-latency applications such as high-performance computing clusters and financial trading systems
• Environments where power efficiency and minimal port space are priorities

When it may not be suitable

This direct attach cable is intended for short-reach copper connections and is not suitable where longer distances or fibre connectivity are required. It does not replace optical transceivers for runs beyond the supported copper reach or for environments that require optical isolation or specific optical link budgets.

Key specifications

• Interface: QSFP56 to QSFP56
• Standard: 200GBASE-CR4 electrical
• Cable type: Copper twinax (direct attach)
• Conductor gauge: 30 AWG
• Data rate: 200 Gbit/s aggregated
• Length: 3 metres

How to use

Ensure both devices support QSFP56 200GBASE-CR4 direct attach connections before installation. Power down or follow hot-plug guidance from your equipment vendor if required. Align the QSFP56 connectors with the ports and insert firmly until the latch engages; ensure the cable is not under tension and route it to avoid sharp bends. Monitor link status on connected devices to confirm a 200G link. For removal, release the latch and pull straight out to avoid damaging the connector or port.

What to consider before purchase

• Confirm that your switches, servers or storage devices support QSFP56 200GBASE-CR4 DACs and that vendor compatibility is acceptable
• Verify the 3 m length fits your rack layout and cable management plan
• Consider whether copper reach and electrical performance meet your environment's distance and interference requirements

Usage recommendations

Use this QSFP56 direct attach cable for short, high-bandwidth links inside racks or between adjacent racks; avoid tight bending radii and keep the cable clear of high-heat sources. For longer runs or where optical connectivity is required, choose appropriate fiber transceivers and cabling.