Network Cable BlueOptics DAC-QSFP-4SFP-10G-3M-BL QSFP28 4xSFP28 InfiniBand 3m Black

The BlueOptics DAC-QSFP-4SFP-10G-3M-BL is a 3 m direct attach cable (DAC) that connects a single QSFP28 port to four SFP28 ports. Designed for short-distance, high-throughput links, this passive twinax copper cable supports 10G per lane aggregation and is suitable for data center top-of-rack and adjacent-rack connections. The cable is supplied in black, weighs approximately 0.25 kg and follows common MSA form-factor practices to ensure interoperability with devices that support QSFP28 to 4×SFP28 DAC connections.

Advantages

This DAC provides low-latency, energy-efficient electrical connectivity for short-range server, switch and storage interconnects without the need for optical transceivers. Its QSFP28-to-4×SFP28 breakout design enables flexible port mapping and consolidation of a 100G interface into four 25G/10G links where supported. The passive twinax construction and 26 AWG conductor specification keep insertion loss low for reliable signal transfer within the specified 3 m range.

Suitable for

• High-density rack and adjacent-rack connections in data centers
• Linking switches, routers and storage systems that support QSFP28 and SFP28 ports
• Ethernet, FCoE and InfiniBand short-reach applications up to the supported bandwidth

Key specifications

• Cable length: 3 m
• Connector A: QSFP28
• Connector B: 4 × SFP28
• Conductor type: passive twinax copper, 26 AWG
• Typical use: direct attach for short-range high-bandwidth links
• Product colour: black
• Approximate weight: 0.25 kg

How to use

Install the cable by inserting the QSFP28 end into the host device QSFP28 port and the SFP28 ends into the target device SFP28 ports. Ensure both endpoints are powered down or that the vendor supports hot-plug insertion before connecting. Verify that each device’s firmware and port configuration support DAC-based links and the intended speed (for example 100G aggregated or 4×25G/10G lanes). After connection, check link status and interface counters in the device management interface to confirm proper operation.

Recommendations

Use this DAC for short-reach interconnects within the same rack or between adjacent racks. Confirm hardware compatibility with vendor documentation before deployment and avoid routing the cable near strong electromagnetic interference sources or sharp bends to maintain signal integrity.