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    Home / Products / Transceivers / 400G/800G Ethernet Transceivers / 800G QSFP-DD / 102580

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

    Product No: 102580
    20 Reviews
    149 Sold
    US$ 1,327.90
    Compatible
    Transceivers type
    6 in real-time stock, 04 Jun, 2026

    Free Shipping over US$ 79.8

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    5-Year Warranty 1-Year Exchange
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    Providing industry-leading limited lifetime warranty.
    Please check our warranty policy for details.
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    Add to Cart Bulk Order Quotes 
    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

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

     

    Arista 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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    • Premium Service (2)
    • Customer Support (1)
    • Excellent Quality (2)
    • Good Price (2)
    • Shopping Experience (1)
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    • Stable (1)
    • High Reliability (2)
    • Compatibility (3)
    • High Performance (3)
    • Niz United States of America
      2026-05-27

      My Arista 7060X5-64 switch gets along great with this module. Been running for about two months now, and not a single dropout.

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

      CompatibleArista

      Verified Purchase

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      0

    • Irate Harry United States of America
      2026-05-24

      The optics worked perfectly with the switch, no problems at all. Super happy to grab high-quality compatible modules without breaking the bank. Plus, the business discount from the sale ended up saving me a ton.

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

      CompatibleArista

      Verified Purchase

      Helpful

      0

    • Bruce United States of America
      2026-05-22

      They were very professional and recommended the right products for me, it was simple and convenient.

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

      CompatibleArista

      Verified Purchase

      Helpful

      0

    • Jay Philip United States of America
      2026-05-20

      Packaging was simple but professional!

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

      CompatibleArista

      Verified Purchase

      Helpful

      0

    • Simon United States of America
      2026-05-19

      The modules arrived well packaged and worked perfectly right after installation. Signal performance over the 2km link has been stable, and support was quick to answer our setup questions.

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

      CompatibleArista

      Verified Purchase

      Helpful

      0

    • Honey Lucia United States of America
      2026-05-18

      I bought this 2FR4 mainly to replace an old link for peace of mind. The packaging was quite neat upon arrival, and the anti-static measures were well done. After installation, it was basically "plug and play," without much hassle. The price is significantly more friendly than the original manufacturer's, and so far, I haven't encountered any problems.

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

      CompatibleArista

      Verified Purchase

      Helpful

      0

    • Laura Daniel United States of America
      2026-05-15

      We use the FR4 for longer data center interconnects, approximately 1-2 kilometers. It demonstrated good stability during actual business traffic operation, with consistently balanced power and signal strength over extended periods, without significant attenuation or fluctuations. This makes it suitable for scenarios requiring longer distances without excessive complexity.

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

      CompatibleArista

      Verified Purchase

      Helpful

      0

    • Eliot United States of America
      2026-05-12

      The connection was stable, and the transmission speed met expectations. This is undoubtedly an excellent product, and I will continue to work with them.

      Transceivers typeAR-QDD-800G-2FR4 | 2km | Dual Duplex CS/UPC

      CompatibleArista

      Verified Purchase

      Helpful

      0

    • Jess Meaden United States of America
      2026-05-07

      I installed these 800G QSFP-DD transceivers on our data center switches. They run stably with zero packet loss under full load. I’m really satisfied with QSFPTEK and will keep purchasing their products for future upgrades.

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

      CompatibleArista

      Verified Purchase

      Helpful

      0

    • Ed Christie United States of America
      2026-05-01

      Overall, it went smoothly, without any compatibility or recognition issues.

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

      CompatibleArista

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

    Compatible Arista

    Transceivers type AR-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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    Arista 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
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    AR-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC
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    Bulk Order Quotes
    Arista Compatible 800GBASE-2FR4 Twin-port QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex CS/UPC SMF Optical Transceiver Module

    Compatible Arista

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

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