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by Cisco
Product Line: Cisco Series
Product Type: Transceiver
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Title: Surplus

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Product Description

The QDD-400G-FR4-S is a Cisco-based pluggable module supporting a nominal rate of 425 Gbps over a cable distance of 2 km using duplex SMF with wavelengths of 1270, 1290, 1310, and 1330 nm. It is designed for high-density networking, compatible with IEEE 802.3cd and IEEE 802.3bs standards, and offers backward compatibility with QSFP+ and QSFP28 modules. This module operates within a temperature range of 0 °C to 75 °C, supports hot swapping, has an optical budget of 4 dB, and consumes a maximum of 12 W.

FAQs for the QDD-400G-FR4-S

  • What is the maximum data rate supported by the device?
    The nominal rate is 425 Gbs.
  • Is the device compatible with older QSFP+ and QSFP28 modules?
    Yes, it offers backward compatibility with QSFP+ and QSFP28 modules.
  • What are the supported wavelengths for transmission?
    Wavelengths supported are 1270, 1290, 1310, and 1330 nm.
  • Can the device be used with Cisco Nexus 9316D-GX and Cisco N3432D-S switches?
    Yes, it is supported on Cisco Nexus 9316D-GX and Cisco N3432D-S.
  • What type of cable is required for this device?
    Duplex SMF (Single-Mode Fiber) is the required cable type.
  • Does the device support Digital Optical Monitoring (DOM)?
    Yes, DOM support is available.
  • What is the maximum allowable insertion loss?
    The maximum supported insertion loss is 4 dB.
  • What is the range of operating temperatures for this device?
    The operating temperature ranges from 0 °C to 75 °C.
  • What color is the pull tab for easy identification?
    The pull tab color is green.
  • What are the minimum and maximum power consumption values?
    Maximum power consumption is 12 W.

Product Review

The CISCO QDD-400G-FR4-S module, supporting a nominal rate of 425 Gbps and compatibility with IEEE 802.3cd and IEEE 802.3bs standards, ensures high-speed data transmission over duplex SMF with a reach of up to 2 km. Its backward compatibility with QSFP+ and QSFP28 modules, along with a broad operating temperature range (0 °C to 75 °C), offers flexibility in various network environments. However, its power consumption of 12 W may be a concern for energy-sensitive deployments, highlighting a need for efficient power management in high-density networking configurations.


The CISCO QDD-400G-FR4-S is a high-capacity, pluggable networking module designed to enhance data transmission over duplex single-mode fiber (SMF) networks. It is engineered to meet the rigorous demands of modern data centers and high-speed network infrastructures, offering a nominal rate of 425 Gbps, which ensures efficient data flow and superior performance across connected networks. This module is compliant with the IEEE 802.3cd and IEEE 802.3bs standards, ensuring compatibility and interoperability with existing network standards. It is designed to work flawlessly with a wide range of Cisco hardware, including the Cisco Nexus 9316D-GX and Cisco N3432D-S, making it a versatile choice for network upgrades or expansions. The QDD-400G-FR4-S supports modulation through PAM4, providing enhanced data integrity and signal quality over longer distances. Featuring backward compatibility with QSFP+ and QSFP28 modules, this device offers a seamless integration into existing network setups, minimizing the need for extensive hardware replacements and allowing for cost-effective network upgrades. Hot swap support ensures minimal downtime during installation or maintenance, as modules can be replaced or added without powering down the entire system.
  • Wavelengths supported include 1270, 1290, 1310, and 1330 nm, covering a broad spectrum for versatile network configurations.
  • The module supports a cable distance of up to 2 km on duplex SMF, providing flexibility in network design and infrastructure.
  • Features a green pull tab for easy identification and handling during installation or maintenance activities.
Optical performance is optimized within a power budget of 4 dB, with minimum and maximum transmit power per lane at -3.2 dBm and 3.5 dBm, respectively, and receive power per lane ranging from -7.3 dBm to 3.5 dBm. This ensures reliable data transmission even at the maximum supported insertion loss of 4 dB. The module's maximum power consumption is 12 W, balancing performance with energy efficiency to support sustainable network operations. The QDD-400G-FR4-S is designed for resilience and durability, capable of operating within a temperature range of 0 °C to 75 °C and stored in conditions ranging from -40 °C to 85 °C. This wide operating temperature range ensures reliability in various environmental conditions, from data centers to outdoor installations. In summary, the CISCO QDD-400G-FR4-S is a state-of-the-art networking module that offers high-speed, efficient, and reliable data transmission over long distances. Its support for advanced modulation techniques, compatibility with existing networking standards, and flexibility in network design make it an ideal solution for upgrading data center capacities or expanding high-speed network infrastructures.


Product NumberCISCO QDD-400G-FR4-S
Hot Swap CapabilityYes
Compatibility With Other EquipmentYes
Compliance with StandardsConforms to IEEE 802.3cd and IEEE 802.3bs
Support for Previous GenerationsCompatible with QSFP+ and QSFP28 Interfaces
Emission Wavelengths1270, 1290, 1310, 1330 nm
Type of FiberSingle-mode Fiber (SMF), Duplex
Maximum Transmission Distance2 kilometers
Identification Tab ColorGreen
Data Rate425 Gbps
Lowest Transmit Power (per channel)-3.2 dBm
Highest Transmit Power (per channel)3.5 dBm
Lowest Receive Power (per channel)-7.3 dBm
Highest Receive Power (per channel)3.5 dBm
Maximum Tolerable Insertion Loss4 dB
Energy Consumption Peak12 Watts
Operational Temperature Range Low0 °C
Operational Temperature Range High75 °C
Storage Temperature Range Low-40 °C
Storage Temperature Range High85 °C
Module TypePluggable
Port DensityDouble
Device Models SupportedCisco Nexus 9316D-GX, Cisco N3432D-S
Signal Encoding MethodPAM4
Digital Optical MonitoringYes
Optical Link Budget4 dB

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