InfiniBand/fibre optic cable BlueOptics 720199-B21-BL 3 m QSFP Male/Male

The BlueOptics 720199-B21-BL is a 3 m InfiniBand/fibre optic direct attach cable with QSFP connectors on both ends, designed for 40G data links in rack and adjacent-rack environments. This BlueOptics cable implements a QSFP-to-QSFP passive twinax copper connection (40GBase-CR4) using 30 AWG wiring and complies with MSA specifications for reliable short-reach high-speed transmission. It is suitable for linking switches, routers, storage systems and other hardware platforms that accept QSFP passive direct attach cables and supports Ethernet, FCoE, Fibre Channel and InfiniBand protocols up to 40 Gbit/s over the specified distance.

Advantages

The cable provides a standardized QSFP male-to-male interface for straightforward rack-to-rack or within-rack connections and is manufactured to MSA guidelines to ensure compatibility with major hardware vendors. As a passive direct attach twinax solution it offers low power consumption and low latency, while using high-quality components for improved longevity and stable signal integrity. Built with 30 AWG conductors and tested for vendor interoperability, the cable is intended to deliver predictable performance for short-distance 40G links.

Suitable for

• 40G uplinks between switches within the same rack or adjacent racks
• Interconnections for storage arrays and networked storage systems
• Short-reach InfiniBand, Ethernet, FCoE or Fibre Channel links
• High-density rack environments requiring QSFP-to-QSFP direct attach connections

Key specifications

• Length: 3 meters
• Connector type: QSFP male to QSFP male
• Supported data rate: up to 40 Gbit/s
• Media type: passive twinax copper (DAC)
• AWG: 30
• Standards compliance: MSA-compliant QSFP direct attach
• Supported protocols: Ethernet, FCoE, Fibre Channel, InfiniBand

How to use

Install the BlueOptics 3 m QSFP-to-QSFP cable by inserting each QSFP male connector into the corresponding QSFP port on the devices to be linked. Ensure that the connected hardware platform supports passive 40GBase-CR4 direct attach twinax cables and that ports are configured for the intended protocol. Route the cable within the rack to avoid sharp bends and mechanical strain; secure the cable with rack management accessories if necessary. After physical connection, verify link status and speed in the device management interface and, if required, adjust port settings or firmware to match vendor interoperability requirements.

Recommendations

Use this passive QSFP twinax cable for short-distance 40G connections inside racks or to adjacent racks. Avoid exceeding recommended bend radius, maintain clean connector interfaces, and confirm device compatibility for passive DAC operation. For longer distances or active transceiver-based links, select appropriate fiber optic or active cabling solutions.