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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

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

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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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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
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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  • 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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  • 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

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  • 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!

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

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

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