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Dell Compatible Q56DD-400G-SR8 400G QSFP-DD SR8 PAM4 850nm 100m DOM MTP/MPO-16 MMF Optical Transceiver Module

Product No :100167
US$ 399.00  US$ 499.00
100 in stock
1. Max data rate up to 425Gbps. QSFP-DD form factor.
2. Reach up to 100m over OM4.
3. DSP Chip.
4. 8x 50G PAM4 modulation.
5. Compliant to QSFP-DD MSA, IEEE 802.3bs and 400GAUI-8/CEI-56G-VSR-PAM4.
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Dell Compatible Q56DD-400G-SR8 400G QSFP-DD SR8 PAM4 Optical Transceiver Module (MMF, 850nm, 100m, MTP/MPO-16 Connector, DOM)


The 400G QSFP-DD SR8 optical module supports speed up to 425Gbps, short-range distance reach up to 100m over 16 parallel multimode fiber (MMF) OM4. QDD-400G-SR8 has an MTP/MPO-16 connector. 400G SR8 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 SR8 transceiver is fully compliant with QSFP-DD Multi-Source Agreement (MSA), IEEE 802.3bs protocol, and 400GAUI-8/CEI-56G-VSR-PAM4 standard.


Part Number QT-QSFP-DD-SR8 Vendor Name QSFPTEK
Form Factor QSFP-DD Interface Type SR8
Max Data Rate 425Gbps (8×53.125Gb/s) Wavelength 850nm
Connector MTP/MPO-16 Cable Type MMF
Max Cable Distance

70m (over OM3)

100m (over OM4)

Modulation PAM4
TX Power -6~4dBm Rx Power <-7.9dBm
Transmitter Type VCSEL 850nm Receiver Type PIN
Power Consumption ≤10W 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 2 Years
Quality Certifications


  • 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/CEI-56G-VSR-PAM4
  • 4. Quality Certifications
    Backed by CE, FCC, ROSH, ISO9001.


Product details

Various Switch Tests


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


transceiver compatibility tests



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.




Comprehensive Testing


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



Questions & Answers

  • 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.

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  • Laura Germany

    To trial a 400G connection between our Cisco Nexus 3000 switches, we required multiple 400G optical transceivers. Before placing the order, I consulted my account manager regarding compatibility concerns. Fortunately, the QDD-400G-DR4-S transceivers we purchased were fully compatible with our switches, and we have not encountered any issues thus far.

    Transceivers typeQDD-400G-DR4-S




  • Amber United States of America

    A few years ago, we collaborated with QSFPTEK to deploy our 10G network, primarily because their products were cost-effective. I never thought that I could depend on QSFPTEK for our high-speed transmission needs as well. To my surprise, QSFPTEK continued to make progress, and their 400G modules and MTP cables worked seamlessly with our Cisco switches, resulting in a smooth 400G direct connection.

    Transceivers typeQDD-400G-SR8




  • Austin United States of America

    Our goal was to upgrade our network system to achieve higher speeds, so we opted for a 400G upgrade and needed to select appropriate transceivers. Since we didn't require long-distance transmission, the 400GBASE-SR8 transceivers were the perfect fit for us. Initially, we were apprehensive that these modules might not be compatible with our Cisco switches, but to our delight, they exhibited outstanding connectivity, and all performance metrics were within normal parameters. I highly recommend them!

    Transceivers typeQDD-400G-SR8




  • Darlene Robinson United States of America

    Ordered items for a very important project for the company. The inventory is sufficient and the service attitude is good, and it works well with the company's switches.

    Transceivers typeQDD-400G-DR4-S




  • Maurice Spencer United States of America

    I finally received it after 2 weeks, it's very easy to use, faster and more energy efficient than buying other transceivers before.

    Transceivers typeQSFP-DD-DR4




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  • QT-QSFP-DD-SR8.pdf

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Dell Compatible Q56DD-400G-SR8 400G QSFP-DD SR8 PAM4 850nm 100m DOM MTP/MPO-16 MMF Optical Transceiver Module

Compatible Dell

Transceivers type Q56DD-400G-SR8