Welcome to QSFPTEK Global     Free shipping on U.S. & EU orders over US$79.8     Global warehouse

Currency: USD
USD - US Dollar
EUR - Euro
JPY - Japanese Yen
KRW - Korean Won
English
Search

Cart

0
Free shipping on U.S. & EU orders over US$79.8
English
Currency: USD
Choose language
Back
  • USD - US Dollar
  • EUR - Euro
  • JPY - Japanese Yen
  • KRW - Korean Won
Back

-
+

Add to Cart

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
5 in real-time stock, 04 Jun, 2026

Free Shipping over US$ 79.8

Global warehouses in stock

5-Year Warranty 1-Year Exchange
Warranty
Providing industry-leading limited lifetime warranty.
Please check our warranty policy for details.
Returns & Exchange
Exchanges caused by the customer's reasons will not be accepted.
Please ensure that the item you're returning is repackaged with all the cords, adapters, and documentation included when you receive it.
Please check our Return Policy for details.
-
+
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
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

  • ALL (2)

Customer Reviews

Write a Review
Sign in to write a review
Write a Review

5 stars

19 Reviews

4 stars

1 Reviews

3 stars

0 Reviews

2 stars

0 Reviews

1 stars

0 Reviews

Reviews with images

See all photos

Read reviews that mention

  • 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
Contact us
Write a Review
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

* Review
0/1000
Allow files type of JPG, PNG, MP4. Maximum file size: 5MB

Maximum size: 5MB

Satisfaction
Customer Gallery
View All Customer Gallery

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

Helpful

8

Sign in to vote
Added to Cart
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
Cisco
Transceivers type
CO-QSFP-DD-800G-2FR4 | 2km | Dual Duplex CS/UPC
Quantity
Subtotal
View Cart
Check Out
Continue shopping

Confirmation

Successfully added shopping cart

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

  • Qty:

  • Name:

  • E-mail:

  • Country