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    Home / Products / Transceivers / 400G/800G Ethernet Transceivers / 800G QSFP-DD / 102577

    Cisco Compatible 800GBASE-2FR4 Twin-port QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex CS/UPC SMF Optical Transceiver Module

    Product No: 102577
    20 Reviews
    196 Sold
    US$ 1,327.90
    Compatible
    Transceivers type
    5 in real-time stock, 04 Jun, 2026

    Free Shipping over US$ 79.8

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    5-Year Warranty 1-Year Exchange
    Warranty
    Providing industry-leading limited lifetime warranty.
    Please check our warranty policy for details.
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    Please ensure that the item you're returning is repackaged with all the cords, adapters, and documentation included when you receive it.
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    1. 8 optical channels, dual CS duplex connectors 
2. Support 800G to 2x 400G-FR4 QSFP-DD application, no breakout cables required
3. 8x 106.25G PAM4 modulation
4. EML + PIN Laser 
5. Max power consumption ≤18W
    See more

    Specifications

    Cisco Compatible 2x 400GBASE FR4 QSFP-DD PAM4 Optical Transceiver Module (1271nm, 1291nm, 1311nm, 1331nm, 2km, Dual Duplex CS, SMF, 0℃ to +70℃, DDM)

     

    Cisco Compatible 2x 400G FR4 QSFP-DD 800G transceiver module supports a max data rate of 850Gbps. It enables the fiber link of 2km over single-mode fiber (SMF) with dual duplex CS connectors. The 800 Gigabit Ethernet signal is carried over 4 wavelengths at 1271nm, 1291nm, 1311nm, and 1331nm. QSFPTEK manufactured  2x 400GBASE FR4 QSFP-DD complies with IEEE 802.3cu-2021, IEEE P802.3ck D3.0, QSFP-DD MSA HW Rev 6.01, CMIS Rev 5.0. DDM (digital diagnostics monitoring) function is supported on the 800G fiber optic transceiver to achieve real-time operating parameters monitoring. Adopting the Pulse-amplitude Modulation (PAM4) modulation, the FR4 QSFP-DD achieves 800 Gigabit Ethernet through 8x 106.25 PAM4 Retimed 2x400GAUI-4 C2M electrical interface. The 800G FR4 QSFP-DD is widely used for gigabit Ethernet, data centers, and 800G to 2x 400G applications.

     

    Part Number QT-QSFP-DD-800G-2FR4 Vendor Name QSFPTEK
    Form Factor QSFP-DD Max Data Rate 850 Gbps (8x 106.25 Gbps)
    Wavelength 1271nm, 1291nm, 1311nm and 1331nm Distance 2km
    Connector Dual CS Duplex Cable Type SMF
    Transmitter Type EML Receiver Type PIN
    TX Power -3.2-4.4dBm Receiver Sensitivity -7.7dBm
    Power Consumption ≤18W Modulation Format PAM4
    DDM/DOM Supported Temperature 0 to 70°C (32 to 158°F)
    Protocols IEEE 802.3cu-2021, IEEE P802.3ck D3.0, QSFP-DD800 MSA HW Rev 6.01, CMIS Rev 5.0 Warranty 1 Year
    Quality Testing Program
    Optical Transceivers Testing

    Take a look at our test program to get the reliable and high-performance optical transceivers.

    Quality Certifications

    Features

    • 1. Advanced Technology
      Features PAM4 modulation technology and built-in DSP chip.
    • 2. Best Price and High Quality
      Based on self-producing capacity and rigorous testing, QSFPTEK can provide cost-effective products with high reliability and performance at a trade price.
    • 3. Protocols
      Complies with IEEE 802.3cu-2021, IEEE P802.3ck D3.0, QSFP-DD MSA HW Rev 6.01, CMIS Rev 5.0 standard.
    • 4. Quality Certifications
      Backed by CE, FCC, ROSH, ISO9001.

    Applications

    Scenario 1: 800G to 800G Direct Connectivity

     

    QT-QSFP-DD-800G-2FR4 Scenario 1 800G to 800G Direct Connectivity 

      

    Scenario 2: 800G to 2x 400GE Connectivity

      

    QT-QSFP-DD-800G-2FR4 Scenario 2 800G to 2x 400GE Breakout Connectivity

     

    Product details

    8x 100Gbps PAM4 Modulation Technology

       

    Utilize 8x electrial lanes and 8x optical lanes modulated at 100G PAM-4 per lane. On the output side, it convert 8x 106.25Gb/s electrical signal to 8x 106.25Gb/s optical signals. On the receiver side, it convert 8x 100Gb/s optical signal to 8x 100Gb/s electrical signals.

     

      

       

    Easy 800G to 2x 400G breakout with OS2 SMFs

       

    The QSFP-DD-800G-2FR4 module is designed with dual duplex CS connectors, while each connector can connect to a physically separate 400G FR4 module via a CS to LC OS2 duplex single-mode fiber. This enables 800G to 2x 400G breakout links without the need for using breakout fiber optic cables. 

     

          

     

    Various Switch Tests

     

    Every module is quality tested for compatibility in the multi-brand switches environment, which guarantees flawless operations.

     

    QSPFTEK LAB All Brands Switches Show

     

     

    Tested in The Host Device to Prove Interoperability

     

    Every unit sold undergoes rigorous quality testing, to ensure compatibility in the target switch environment, guaranteeing perfect operation.

     

    QSFPTEK Test Rack

     

     

    Comprehensive Testing

     

    Every module is qualified through rigorous procedures and advanced equipment to ensure high-quality and reliable optical devices for you.

     

    QSFPTEK Test Devices

      

     

    800G QSFP-DD Optical Transceivers Contrast Table

     

    Part Number

    QT-QSFP-DD-800G-SR8

    QT-QSFP-DD-800G-2VR4

    QT-QSFP-DD-800G-DR8

    QT-QSFP-DD-800G-2DR4

    Image

    Data Rate

    800G

    800G

    800G

    800G

    Optical Connector

    Single MPO-16/APC

    Dual MPO-12/APC

    Single MPO-16/APC

    Dual MPO-12/APC

    Cable Type

    MMF

    MMF

    SMF

    SMF

    Wavelength

    850nm

    850nm

    1310nm

    1310nm

    Reach

    50m

    50m

    500m

    500m

    Modulation

    PAM4

    PAM4

    PAM4

    PAM4

    Max Power Consumption

    < 16W

    < 16W

    < 16.5W

    < 18W

    Application

    800G to 800G, 800G to 2x400G breakout

    800G to 800G, 800G to 2x400G breakout

    800G to 800G, 800G to 2x400G breakout, 800G to 8x100G breakout

    800G to 800G, 800G to 2x400G breakout

    Matching Downlink  Transceivers

    QT-QSFP-DD-SR4 (400G)

    QT-Q112-400G-SR4

    QT-OSFP-400G-SR4

    QT-QSFP-DD-SR4 (400G)

    QT-Q112-400G-SR4

    QT-OSFP-400G-SR4

    QT-QSFP-DD-DR4 (400G)

    QT-Q112-400G-DR4

    QT-OSFP-400G-DR4

    QT-QSFP28-DR1

    QT-QSFP-DD-DR4 (400G)

    QT-Q112-400G-DR4

    QT-OSFP-400G-DR4

    Part Number

    QT-QSFP-DD-800G-2XDR4

    QT-QSFP-DD-800G-2FR4

    QT-QSFP-DD-800G-2LR4

    		  

    Image

    		 

    Data Rate

    800G

    800G

    800G

    		  

    Optical Connector

    Dual MPO-12/APC

    Dual Duplex CS/UPC

    Dual Duplex LC/UPC

    		  

    Cable Type

    SMF

    SMF

    SMF

    		  

    Wavelength

    1310nm

    1271nm, 1291nm, 1311nm and 1331nm

    1271nm, 1291nm, 1311nm and 1331nm

    		  

    Reach

    2km

    2km

    10km

    		  

    Modulation

    PAM4

    PAM4

    PAM4

    		  

    Max Power Consumption

    < 18W

    < 18W

    ≤ 18W

    		  

    Matching Transceivers

    QT-QSFP-DD-DR4+ (400G)

    QT-Q112-400G-DR4+

    QT-QSFP28-FR1

    QT-QSFP-DD-FR4 (400G)

    QT-Q112-400G-FR4

    QT-OSFP-400G-FR4

    QT-QSFP-DD-LR4 (400G)
    QT-OSFP-400G-LR4

    		  

    Application

    800G to 800G, 800G to 2x400G breakout, 800G to 8x100G breakout

    800G to 800G, 800G to 2x400G breakout

    800G to 800G, 800G to 2x400G breakout

    		  

    Questions & Answers

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    Customer Reviews

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    • ALL (13)
    • Premium Service (4)
    • Customer Support (2)
    • Excellent Quality (2)
    • Stable (2)
    • High Reliability (2)
    • Compatibility (4)
    • High Performance (1)
    • Neox United States of America
      2026-05-27

      I reached out through the chat box asking which products would work for my connection setup, and the sales rep, Talia, recommended this 800G QSFP-DD module. Really appreciate it!

      Transceivers typeCO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Matthew United Kingdom
      2026-05-25

      I ordered just one to try out first, and it worked great with my Cisco switch. So I ended up buying 30 more and got a discount. Thanks a lot!

      Transceivers typeCO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Calvin United States of America
      2026-05-22

      The account manager responds promptly, and the product offers stable transmission and excellent performance.

      Transceivers typeCO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Elsa Henry United States of America
      2026-05-20

      Bought a pair of these mainly for a lab expansion project. We move hardware around pretty often during testing, and the modules have held up fine through multiple reinsertions. One small thing I liked is the latch feels solid, doesn’t have that loose feeling some cheaper optics do.

      Transceivers typeCO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Samuel United States of America
      2026-05-19

      Installed these on a long-distance interconnect and they've been working flawlessly. Compatibility was smooth, signal quality has stayed stable, and the CS connectors made cable management much cleaner.

      Transceivers typeCO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Kenneth United States of America
      2026-05-12

      The sales manager responded promptly, providing excellent service! Because I was continuing with this module, the QSFPTEK sales manager helped me ship the module in a timely manner. I will definitely choose them again!

      Transceivers typeQDD-2X400G-FR4 | 2km | Dual Duplex CS/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Isaac United States of America
      2026-05-11

      Installed these 800G 2FR4 modules in our AI cluster interconnect last month and they've been running reliably ever since. Link stability and DDM readings have been solid, and compatibility with our switches was seamless. The dual CS design also helped reduce cable congestion in a high-density rack. Good performance for the price.

      Transceivers typeQDD-2X400G-FR4 | 2km | Dual Duplex CS/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Bess Morrison United States of America
      2026-05-06

      This 2FR4 is actually our second purchase. The first was for testing, this time it's going straight to production. To be honest, there weren't any surprises, just stability.

      Transceivers typeCO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Marcus United States of America
      2026-04-27

      The on-site installation was successful due to smooth compatibility recognition, which greatly accelerated the deployment process.

      Transceivers typeCO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Gilberto M United States of America
      2026-04-07

      Compared to the previous solution, this 800G optical module is much easier to install and deploy, and there were virtually no compatibility issues when upgrading the network.

      Transceivers typeQDD-2X400G-FR4 | 2km | Dual Duplex CS/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    Video

    Resources

    • PDF Document
      QT-QSFP-DD-800G-2FR4 Datasheet.pdf
    • PDF Document
      Transceiver Module User Guide.pdf
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    Cisco Compatible 800GBASE-2FR4 Twin-port QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex CS/UPC SMF Optical Transceiver Module

    Compatible Cisco

    Transceivers type CO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC

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    Mark

    2023-12-15
    This product works well with my switch, and I plan to buy some DWDM transceivers from QT. Excellent value fo ct works well with my switch, and I plan to buy some DWDM transceivers from QT. Excellent valur money!

    Verified Purchase

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    Cisco Compatible 800GBASE-2FR4 Twin-port QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex CS/UPC SMF Optical Transceiver Module
    US$ 1,327.90
    Compatible
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    CO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC
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    Bulk Order Quotes
    Cisco Compatible 800GBASE-2FR4 Twin-port QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex CS/UPC SMF Optical Transceiver Module

    Compatible Cisco

    Transceivers type CO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC

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