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QSFP-DD 400G to 100G Breakout Options Connections

Posted by Fouad Mazhar on 2025 Jan 22nd

QSFP-DD 400G to 100G Breakout Options Connections

Introduction

As data center networks transition to higher speeds, QSFP-DD 400G modules are becoming the go-to solution for meeting increased bandwidth demands. However, many existing infrastructures still operate on 100G links, creating a need for effective breakout options that ensure compatibility and maximize resource utilization.

In this blog, we explore the key breakout configurations for QSFP-DD 400G to 100G connections, their technical details, and the innovative 4xSN breakout connector option for enhanced density and scalability.


Why QSFP-DD Breakout Configurations Matter

Breakout configurations allow network operators to fully leverage high-capacity 400G QSFP-DD ports by connecting them to multiple 100G QSFP28 transceivers. These options are critical for:

  • Flexibility: Supporting seamless integration of 400G technology with existing 100G deployments.
  • Cost Efficiency: Reducing the need for expensive infrastructure upgrades.
  • Scalability: Enabling gradual, low-disruption upgrades to high-speed networks.
  • Density Optimization: Improving port utilization for better performance and ROI.


Key Breakout Options

The table below summarizes the most popular breakout configurations for QSFP-DD to 100G:

OptionModule/CableBreakout TransceiversCabling requiredReachFiber TypeModulation
1QSFP-DD 400G-SRBD4x QSFP28 100G-SRBD or SR1.2MPO to 4x LC breakout cable100mMMF50G PAM-4
2QSFP-DD 400G-SR82x QSFP28 100G-SR4MPO-16F to 2x MPO-8 breakout cable100mMMF25G NRZ
3QSFP-DD 400G-DR44x QSFP28 100G-DR1MPO to 4x LC breakout cable500mSMF100G PAM-4
4QSFP-DD 400G-xDR4/DR4+4x QSFP28 100G-FR1MPO to 4x LC breakout cable2kmSMF100G PAM-4
5QSFP-DD 400G-2FR42x QSFP28 100G-CWDM4Duplex SMF2kmSMF25G NRZ
6QSFP-DD 400G-PLR44x QSFP28 100G-LR1MPO to 4x LC breakout cable10kmSMF100G PAM-4
7QSFP-DD 400G-DR4-4xSN connectors4x QSFP28 100G-DR1SN to duplex LC cable (4x)500mSMF100G PAM-4
8QSFP-DD 400G-xDR4/DR4+-4xSN connectors4x QSFP28 100G-FR1SN to duplex LC cable (4x)2kmSMF100G PAM-4
9QSFP-DD 400G-PLR4-4xSN connectors4x QSFP28 100G-LR1SN to duplex LC cable (4x)10kmSMF100G PAM-4
10QSFP-DD 400G-LR4 to LR14x QSFP28 100G-LR1MUX/DEMUX10kmSMF50G PAM-4
11QSFP-DD AEC cable4x QSFP28 100G (4x28G NRZ)Inbuilt QSFP-DD-4xQSFP281-5mCopperPAM4 to NRZ
12QSFP-DD Active Copper DAC4x QSFP28 100G PortsInbuilt QSFP-DD-4xQSFP281-3mCopperPAM4
13QSFP-DD Passive DAC2x QSFP28 100G PortsInbuilt QSFP-DD-4xQSFP281-5mCopperPAM4
14QSFP-DD Active AOC4x QSFP28 100G-LR1Inbuilt QSFP-DD-4xQSFP2820mSMFNRZ


The SN Connector: Revolutionizing Breakout Configurations

Our 400G QSFP-DD DR4/xDR4/PLR4 modules now support 4xSN connectors, offering a modern alternative to MPO connectivity. The SN connector, developed by SENKO, is designed for individual, independent duplex fiber breakout, providing unmatched density and scalability.

Key Features of the SN Connector:

  • Compact Design: Four individual connectors with eight fibers total in a single QSFP-DD transceiver interface.
  • Enhanced Density: Configure a 32x 400G switch as a 128x 100G switch within a 1U rack space.
  • Simplified Cabling: Eliminates the complexity of MPO cables, making it easier to manage connections.


Conclusion

QSFP-DD breakout options, including the innovative 4xSN connector, offer a powerful solution for bridging the gap between 400G and 100G networks. These configurations ensure that your network is flexible, scalable, and ready for future demands.

For assistance with implementation or to learn more about our breakout solutions, contact us today!