Network Cable BlueLAN Q28-4S28-DAC-2M QSFP28 to 4xSFP28 100GBASE-CR4 2m Blue

The BlueLAN Q28-4S28-DAC-2M QSFP28 to 4xSFP28 100GBASE-CR4 2m Blue is a passive direct attach breakout cable designed for short-reach, high-bandwidth interconnects. With a 2 meter length and AWG26 conductor specification, this cable splits a single QSFP28 100G interface into four 25G SFP28 channels, providing low-latency connectivity for top-of-rack switches, aggregation devices and server ports. The passive design requires no external power or transceivers, simplifying rack deployments and reducing component count.

Advantages

This breakout DAC offers predictable electrical performance with minimal signal loss across a 2 m link, facilitating reliable 100G to 4×25G connectivity. The AWG26 conductors ensure adequate signal integrity for short-range links while keeping cable diameter and weight low. As a passive cable, it reduces power consumption compared with active optical transceivers and eliminates the need for separate SFP28 transceiver modules. The integrated QSFP28 and four SFP28 plugs are keyed for secure insertion and straightforward installation.

Suitable for

• Top-of-rack switch to server connections in data centers
• High-performance computing clusters requiring 100G breakout to 25G lanes
• Network aggregation and spine-leaf fabrics with short-reach links
• Lab and test environments for validating multi-lane 25G configurations

Key specifications

• Connector configuration: QSFP28 to 4 × SFP28
• Nominal data rate: 100GBASE-CR4 total (4 × 25GBASE-CR)
• Cable type: Passive Direct Attach Breakout Cable (DAC)
• Length: 2 meters
• Conductor: AWG26
• Application: Short-reach copper interconnect for racks and switches

How to use

Select compatible QSFP28 and SFP28 ports on your switch or server that support 100GBASE-CR4 to 4×25GBASE-CR breakout operation. Insert the QSFP28 end into the 100G host port and route the cable to the destination device, then insert each SFP28 plug into the corresponding 25G ports. Ensure ports are powered down or disabled if your equipment vendor recommends this for hot-plugging. After physical connection, verify lane mapping and link status in the device management interface and adjust switch configuration if required for breakout mode.

Usage recommendations

Use this cable for short-distance rack and row interconnects within the same equipment room; avoid running it alongside high-power electrical lines to minimize potential interference. Confirm switch and server firmware support for QSFP28-to-4×SFP28 breakout operation and check port settings after installation. For longer distances or environments requiring optical isolation, consider active or optical transceiver alternatives.