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    Products / Transceivers / 400G/800G/1.6T Ethernet Transceivers / 400G QSFP-DD / 202940
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    Cisco QDD-400G-VR4 Compatible 400GBASE-SR4 QSFP-DD PAM4 850nm 50m DOM MPO-12/APC MMF Optical Transceiver Module

    Product No: 202940
    0 Reviews
    128 Sold
    $659.90
    Compatible
    Transceivers type
    12 in real-time stock, 26Oct, 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.
    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.
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    1. Tested in the host devices to prove interoperability and reliability
2. Built-in Macom DSP Chip, 4x 100G PAM4 modulation
3. Maximum link length of 50m on OM4/OM5 fiber with FEC
4. Maximum Power Dissipation < 9W
5. Backward compatible with QSFP+, QSFP28 and QSFP56 modules
6. Compliant to 400GBASE-SR4, 2x200GBASE-SR2, 4x100GBASE-SR1
    See more

    Specifications

    Cisco QDD-400G-VR4 Compatible 400G QSFP-DD SR4 PAM4 Optical Transceiver Module (MMF, 850nm, 50m, MPO-12 Connector, DOM)

     

    The Cisco QDD-400G-VR4 Compatible 400GBASE-SR4 QSFP-DD optical module supports speeds up to 425Gbps, short-range distances reach up to 50m over 12 parallel multimode fiber (MMF) OM4. QDD-400G-VR4 has an MTP/MPO-12 connector. 400G SR4 is designed based on PAM4 (Pulse Amplitude Modulation 4-level) modulation technology, DSP (Digital Signal Processing) chip, and QSFP-DD form factor. QSFPTEK 400G QSFP-DD SR4 transceiver is fully compliant with QSFP-DD MSA HW7.0, IEEE 802.3df-2024:- 4x100GBASE-SR1/2x200GBASE-SR2/1x400GBASE-SR4 optical interface, IEEE 802.3:- 4x100GAUI-2/2x200GAUI-4/1x400GAUI-8 C2M electrical interface, CMIS Rev 5.0, and 400GAUI-8-PAM4 standard.

     

    Part Number QT-QSFP-DD-SR4-50M Vendor Name QSFPTEK
    Form Factor QSFP-DD Interface Type SR4
    Max Data Rate 425Gbps (4×100 Gb/s) Wavelength 850nm
    Connector MTP/MPO-12/APC Cable Type MMF
    Max Cable Distance 50m (over OM4/OM5) with FEC Modulation PAM4
    TX Power -4.6 to 4 dBm Receiver Sensitivity <-6.4 dBm
    Transmitter Type VCSEL 850nm Receiver Type PIN
    Power Consumption ≤8W Temperature Range 0 to 70°C (32 to 158°F)
    DDM/DOM Supported Forward Error Correction (FEC) Host FEC Supported
    Protocols QSFP-DD MSA, IEEE 802.3bs 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

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    Features

    • 1. Advanced Technology
      Features with PAM4 modulation technology, DSP chip and COB packaging technology.
    • 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
      Compliant with QSFP-DD MSA, IEEE 802.3bs and 400GAUI-8-PAM4.
    • 4. Quality Certifications
      Backed by CE, FCC, ROSH, ISO9001.

    Applications

    Scenario 1: 400G to 400G Direct Connectivity

    QT-QSFP-DD-SR4 Scenario 1 400G to 400G Direct Connectivity

    Product details

    Various Switch Tests

     

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

     

     

     

    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.

     

    QDD-400G-SR4-S compatibility test

     

     

    Comprehensive Testing

     

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

     

     

     

    Short to Medium Reach 400G QSFP-DD Optics Contrast Table

     

    Part Number

    QT-QSFP-DD-SR4

    QT-QSFP-DD-SR8

    QT-QSFP-DD-DR4

    QT-QSFP-DD-DR4+

    QT-QSFP-DD-FR4

    Image

    Center Wavelength

    850nm

    850nm

    1310nm

    1310nm

    1310nm

    Connector

    MTP/MPO-12

    MTP/MPO-16

    MTP/MPO-12

    MTP/MPO-12

    Duplex LC

    Cable Distance (Max.)

    100m

    100m

    500m

    2km

    2km

    Modulation

    PAM4

    PAM4

    PAM4

    PAM4

    PAM4

    Transmitter + Receiver Type

    VCSEL 850nm + PIN

    VCSEL 850nm + PIN

    EML + PIN

    EML + PIN

    CWDM EML + PIN

    TX Power

    -4.6~4.0dBm

    -6.5~4.0dBm

    -2.9~4.0dBm

    -3.1~4.0dBm

    -3.2~3.5dBm

    Receiver Sensitivity

    <-6.3dBm

    <-8.4dBm

    <-5.9dBm

    <-7.1dBm

    <-7.3dBm

    Power Consumption

    ≤8W

    ≤12W

    ≤12W

    ≤12W

    ≤12W

    Temperature

    0 to 70°C (32 to 158°F)

    0 to 70°C (32 to 158°F)

    0 to 70°C (32 to 158°F)

    0 to 70°C (32 to 158°F)

    0 to 70°C (32 to 158°F)

    Application

    Data Center

    Data Center

    400G to 2x200G Breakout

    400G to 8x50G Breakout

    Data Center

    400G to 4x100G Breakout

    800G to 2x400G Breakout

    Data Center

    400G to 4x100G Breakout

    800G to 2x400G Breakout

    Data Center

    800G to 2x400G Breakout

      

    Questions & Answers

    • All (11)
    • 400G QSFP-DD (2)
    • QT-QSFP-DD-DR4 (3)
    • QT-QSFP-DD-SR8 (4)
    • QT-QSFP-DD-FR4 (1)
    • QT-OSFP-400G-SR8 (1)
    • What is the difference between using 4x100 vs 8x50 of 400G QSFP-DD transceivers?
      The main difference is that the optical signal transmission method, 4x100G means transmitting optic signals in 4 channels, and 100G each channel, while 8x50G is transmitted optic signal in 8 channels, and 50G each channel.
    • What's the meaning of ''DR4''?
      ''DR'' means that the 500m transmission distance and using Singlemode fiber, ''4'' implies there refers to 4 optical channels. The 4 independent optical channels inside the DR4 modules transmitting data on separate fibers make up a total of 8 fibers(4 Tx and 4 Rx). Each of the optical channel transmission rates is 100Gb/s.
    • What type of optical cable should be used with 400G-SR8?
      The 400G-SR8 optical module employs a single-row, angled (APC) MTP16 connector to establish a connection with parallel multi-mode fiber, facilitating the linkage of 8 fiber pairs. We recommend utilizing the QSFPTEK MTP-16 APC OM4 Cable for optimal performance.

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    Video

    Resources

    • PDF Document
      QT-QSFP-DD-SR4-50M 400G Datasheet.pdf
    • PDF Document
      Transceiver Module User Guide.pdf
    Check Test Reports on Target Device
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    Cisco QDD-400G-VR4 Compatible 400GBASE-SR4 QSFP-DD PAM4 850nm 50m DOM MPO-12/APC MMF Optical Transceiver Module

    Compatible Cisco

    Transceivers type QDD-400G-VR4 | 50m | MPO-12/APC

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    Satisfaction
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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 QDD-400G-VR4 Compatible 400GBASE-SR4 QSFP-DD PAM4 850nm 50m DOM MPO-12/APC MMF Optical Transceiver Module
    $659.90
    Compatible
    Cisco
    Transceivers type
    QDD-400G-VR4 | 50m | MPO-12/APC
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    Product image
    Cisco QDD-400G-VR4 Compatible 400GBASE-SR4 QSFP-DD PAM4 850nm 50m DOM MPO-12/APC MMF Optical Transceiver Module

    Compatible Cisco

    Transceivers type QDD-400G-VR4 | 50m | MPO-12/APC

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