Cisco QDD-400G-SR8-S Compatible 400GBASE-SR8 400G QSFP-DD SR8 Optical Transceiver Module-HYTOPTODEVICE

• Cisco Nexus 9000 Series: N9K-C9316D-GX, N9K-C93600CD-GX, N9K-C9332D-GX2B.

• Cisco 8000 Series Routers: 8201-32FH, 8202-32FH, 8800-LC-36FH.

• Cisco ASR 9000 Series: A99-10X400GE-X-SE, A99-10X400GE-X-TR.

• Cisco Nexus 3000 Series: N3K-C3408-S, N3K-C3432D-S.

• Operating Systems: Native support in Cisco NX-OS and IOS XR, featuring full DDM/DOM monitoring for real-time power and temperature diagnostics.

• Intra-Rack & Rack-to-Rack: The primary 400G solution for short-distance server-to-switch or switch-to-switch links in high-density racks.

• 400G to 2x200G Breakout: Can be configured to breakout into two 200G-SR4 signals for flexible fabric scaling.

• 400G to 8x50G Breakout: Supports high-density fan-out to 50G endpoints using MPO-16 to 8x LC breakout cables.

• HPC Clusters: Ideal for low-latency interconnects in Artificial Intelligence (AI) and Machine Learning (ML) compute pods.

           
Connectivity Solutions(Applications)：

 Scenarios 1:400G Switch Link 400G Switch


Scenarios 2:400G Switch Link 50G Switch



Scenarios 3:400G Switch Link 200G NIC

FAQ for Cisco QDD-400G-SR8-S Compatible QSFP-DD Transceiver Modules

Q1:What is QDD-400G-SR8? A:The 400G QSFP-DD SR8 is a hot pluggable optical transceiver module with a speed of 400Gbps, a wavelength of  850nm, and a transmission distance of up to 100m with OM4 MMF. It is ideal for data centre, 400G Ethernet and Infiniband Interconnects.

Q2:What is the maximum distance of the QDD-400G-SR8-S? A:The HYTOPTODEVICE QDD-400G-SR8-S supports up to 100m over OM4 MMF and 70m over OM3 MM

Q3:What fiber connector is required for the Huawei QSFP-DD-400G-SR8?A:The 400G QSFP DD SR8 module uses an MPO-16/APC connector. It is very important for 400G/800G MMF links to use the APC (Angled Physical Contact) polish. that can minimize back-reflection and maintain signal quality.

Q4:How does this differ from the 400G-DR4 or SR8 modules?A:DR4 is for single-mode fiber (500m), the SR8 is a short-reach (100m) multimode solution. Unlike the DR4 (4-lane), the 400G QSFP-DD SR8 uses 8 parallel lanes, providing better granularity for 50G/100G breakout applications in high-density AI clusters.

Q5:Does the HYTOPTODEVICE QSFP-DD-400G-SR8 support breakout to 50G?A:Yes. The 400G QSFP-DD SR8 utilizes parallel  SR8 architecture, supporting 8x50G breakout. that allows you to connect one 400G OSFP port to eight separate 50G SFP56 SR ports with an MPO-16 breakout cable. 400G QSFP-DD SR8 manufacturer china HYTOPTODEVICE support breakout to 50G.

Q6:Where to buy 400G QSFP DD SR8 optical transceiver?A:There are many manufacturers that produce and sell 400G  fiber optical modules, but 400G QSFP-DD SR8 manufacturer china HYTOPTODEVICE is the excellent provider: a source factory, fully controllable process, reliable performance, 100% compatible, sufficient inventory, fast delivery, and quick response.

Q7:The link is "Up" but I have high packet loss. Why? A:There could be two reasons,1. Dirty connectors:tiny dust particles can obstruct signal transmission. Please use  fiber optic cleaner to clean the connector. 2. Fiber optic cable bending: avoid  severe bending of the fiber optic cable.

Q8:Is the 400G QSFP-DD SR8 backward compatible with lower-speed modules,such as 100G?A:Yes,The 400G SR8 is backward compatible with lower-speed optical transceivers, such as 200G,100G and 50G, but the performance will be reduced.

 Q9:How do HYTOPTODEVICE ensure 400G QSFP-DD SR8 module compatibility with network switch?A:Ensuring 100% compatibility, optical modules must be coded to match the switch's requirements. Source-factory HYTOPTODEVICE was equipped with various high-speed switch,the brands include such as Cisco,NVIDIA,Huawei. highly professional in coding equipment for various brands to ensure they are recognized and running in your  device.
 
Q10:Is QDD-400G-SR8 hot-swappable?A:HYTOPTODEVICE fiber transceiver modules are hot-pluggable, hot Pluggable QSFP-DD MSA Compliant.you can plug or unplug the optical transceiver, while the device is powered on without damaging the hardware.

Q11:Why Choose HYTOPTODEVICE for Huawei QSFP-DD-400G-SR8?A: High-Speed Optical Transceiver Manufacturer China HYTOPTODEVICE ensures that the QDD-400G-SR8 is coded and tested for full compatibility with major switch vendors (such as Cisco, Juniper, NVIDIA/Mellanox, and huawei). They verify the EEPROM settings to ensure "plug-and-play" functionality without port-recognition errors.

Q12：Does it use MPO-12 or MPO-16？A:The 400G QSFP-DD SR8  must use MPO-16 (APC) connectors. The reason is that SR8 uses 8 channels for transmission (Tx) and 8 channels for reception (Rx) (a total of 16 optical fibers). and  MPO-12 fiber optic cables were not suitable.

Why Network Engineers Choose HYTOPTODEVICE

HYTOPTODEVICE has supplied over 500,000 optical transceiver modules to data centers, ISPs, and enterprise networks across 100+ countries since 2011. Every module undergoes a 72-hour burn-in test and full DDM/DOM validation before shipment.

• 100% MSA-compliant modules with Cisco, Huawei,Dell,Juniper, and Arista compatibility
• ISO 9001:2015 certified manufacturing facility in Shenzhen
• Average lead time of 3–5 business days with DHL/FedEx express options
• Dedicated pre-sales engineering support for custom configurations
• Actual hardware,actual switches,actual results.we publish compatibility test video,eliminate compatibility anxiety. you can watch before you buy. 
• We can provide inspection and shipping videos to make you feel as if you are right here with the product.

"We replaced 200 Cisco-branded SFPs with HYTOPTODEVICE equivalents across our spine layer — zero compatibility issues, 40% cost reduction."— Network Architect, Tier-2 ISP, Germany

Quality Certification & Compliance：

 At HYTOPTODEVICE, our quality commitment is backed by industry-standard validations. From fiber optical transceiver manufacturing to final inspection, our processes ensure global compliance and reliability.

We adhere to rigorous standards for our SFP modules and network solutions:

• ISO 9001: Certified quality management and production consistency.

• CE & FCC: Fully compliant for seamless Global Market Access.

• RoHS: Committed to environmental responsibility and hazardous material control.

• Proven Reliability: Rigorous testing to reduce compliance risk and ensure safety.

Certified Quality. Global Standards. Guaranteed Performance.

Rigorous Industrial Product Testing：

   

100% 3rd Party Compatible：

Partial Test Demonstration：

Others: