Product Detail
Cisco Compatible 400GBASE-SR4 QSFP-DD 850NM 100M PAM4 Optical Transceiver Module
The Cisco compatible QDD-400G-SR4-S is a cutting-edge 400GBASE-SR4 QSFP-DD optical module. designed for high-density, short-reach data center applications. While traditional SR8 modules require 16-fiber cabling, it leverages advanced 4-lane 100G PAM4 technology, allowing for 400Gbps transmission over standard MPO-12 multimode fiber (MMF) infrastructure.it supports distances up to 100m over OM4 and 60m over OM3. By integrating the 400g qsfp-dd module into your network, you can upgrade legacy 100G MPO-12 cabling to 400G without the expense of a complete fiber plant overhaul. Fully compliant with QSFP-DD MSA and IEEE 802.3db standards, 400G Transceivers Manufacturer China HYTOPTODEVICE ensures 100% interoperability with Cisco’s flagship switching and routing platforms, delivering a stable long-term supply for AI-driven and cloud-scale networks.
Compatibility and Supported Devices
The HYTOPTODEVICE Cisco QDD-400G-SR4-S pluggable transceiver is rigorously tested and firmware-optimized for seamless "Plug-and-Play" integration with:
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Cisco Nexus 9000 Series Switches: N9K-C9316D-GX, N9K-C93600CD-GX, N9K-C9332D-GX2B, N9K-X9716D-GX.
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Cisco 8000 Series Routers: 8201-32FH, 8202-32FH, 8800-LC-36FH.
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Cisco ASR 9000 Series: High-density 400G line cards like A99-10X400GE-X-SE.
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Cisco NCS 5500/5700 Series: NC57-24DD, NC57-18DD-SE.
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Software Compatibility: Full support for Cisco NX-OS and IOS XR, ensuring native Digital Optical Monitoring (DOM) and zero "unsupported transceiver" errors.
Primary Application Scenarios
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100G to 400G Infrastructure Upgrade: Use the HYTOPTODEVICE QDD-400G-SR4-S transceiver module to leverage existing MPO-12 OM4 trunk cables for 400G throughput.
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AI and Machine Learning Clusters: High-bandwidth, low-latency 400G connectivity for GPU compute pods within the same rack or across adjacent racks.
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Hyperscale Leaf-Spine Architecture: Efficient 400G links between Leaf and Spine switches in high-radix Cisco Nexus environments.
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Data Center Rack Consolidation: Utilizing the HYTOPTODEVICE QDD-400G-SR4-S for high-density top-of-rack (ToR) switch-to-switch stacking.
Key Product Parameters of 400G SR4 Fiber Transceiver
| Cisco Compatible |
QDD-400G-SR4-S |
Vendor Name |
HYTOPTODEVICE |
| Form Factor |
QSFP-DD |
Wavelength |
850nm |
| Max Distance |
60m on OM3/100m on OM4 |
Modulation Format |
PAM4 |
| Host Required |
FEC |
Connector |
MTP/MPO-12 |
| Voltage Supply |
3.3V |
Cable Type |
MMF |
| Modulation (electrical) |
8x53.125Gb/s PAM4 |
Modulation (Optical) |
4x106.25Gb/s PAM4 |
| TX Power |
-4.6~+4.0dBm |
Receiver Sensitivity |
<-6.4dBm |
| DDM Support |
Yes |
Receiver Type |
PIN |
| Operation Temperature |
0 to 70°C (32 to 158°F) |
Maximum Power |
<9W |
| Protocols |
QSFP-DD MSA, IEEE 802.3bs |
Application |
400G Ethernet, Data Center Interconnect |
FAQ for 400G QSFP-DD Optical Transceiver Modules
Q1:What is QDD-400G-SR4? A:The 400G QSFP-DD SR4 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 MPO-12,OM4 MMF. It is ideal for data centre, 400G Ethernet and Infiniband Interconnects.
Q2:What is the maximum transmission distance of the 400G QSFP-DD SR4 transceiver?A:HYTOPTODEVICE QSFP-DD 400G SR4 module supports the maxium transmitting distance of up to 100m with MPO-12, OM4 MMF
Q3:What fiber connector is required for the HYTOPTODEVICE QSFP-DD-400G-SR4?A:The 400G QSFP DD SR4 module uses an MPO-12 connector with MMF.
Q4:Does the HYTOPTODEVICE QDD-400G-SR4-S require FEC?A:Yes. According to the IEEE 802.3db standard, Host KP4 FEC must be enabled on the Cisco switch port to achieve the 100m distance with a reliable Bit Error Rate (BER).
Q5:Does the HYTOPTODEVICE QSFP-DD-400G-SR4 support breakout to 100G?A:Yes, The 400G SR4 module operates by using 4 independent channels, each channel running at 100G PAM4. so the HYTOPTODEVICE QSFP-DD-400G-SR4 transceiver fully supports breakout applications to 4x 100G.
Q6:Where to buy 400G QSFP DD SR4 optical transceiver?A:There are many factories that produce and sell 400G fiber optical modules, but 400G optical transceiver 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 SR4 backward compatible with lower-speed modules,such as 100G?A: Yes. QSFP-DD 400G SR4 uses parallel fiber (MPO-12). Using an MPO-to-4xLC breakout cable, you can link it to four 100G-SR (PAM4) transceivers.
Q9:How do HYTOPTODEVICE ensure 400G QSFP-DD SR4 module compatibility with network switch?A:Ensuring 100% compatibility, optical transceiver modules must be coded to match the switch's requirements. 400G Optical Transceiver Manufacturer China HYTOPTODEVICE was equipped with various high-speed switch,the brands include such as Cisco,NVIDIA,Arista,Juniper. highly professional in coding equipment for various brands to ensure they are recognized and running in your device.
Q10:Is QDD-400G-SR4 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 QSFP-DD-400G-SR4?A: High-Speed Optical Transceiver Manufacturer China HYTOPTODEVICE ensures that the QDD-400G-SR4 is coded and tested for full compatibility with major switch vendors (such as Cisco, Juniper, Arista, 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 SR4 uses MPO-12 connector. There are 4 transmit and 4 receive channels (8 fibers total). An MPO-12 connector is used, with the 4 middle fibers typically remaining unused.
Q13:Who is the best optical transceiver manufacturer in china? A:HYTOPTODEVICE is the best optical transceiver manufacturer in china with high-performance,100% compatibility, fast and stable delivery,sour factory price.
Q14:Q:Can a 400G SR8 module to a 400G SR4 module be connected?A:No. they can not interconnect.SR8 use the MPO-16 connector, SR4 for MPO-12. the connector mismatch. their wavelength and lane speed mismatch.
Q15: What difference is SR4 vs SR8 for 400G QSFP-DD modules?
| Feature |
400G SR4 |
400G SR8 |
| Lanes ways |
4-lane transmit + 4-lane receive |
8-lane transmit + 8-lane receive |
| Lane Rate |
100G PAM4 per lane |
50G PAM4 per lane |
| Optical Connector |
MPO-12 |
MPO-16 (or MPO-24) |
| Fiber Type |
Multi-mode (OM5 recommended) |
Multi-mode (OM3/OM4/OM5) |
| Transmission Tech |
BiDi (Bi-directional) + WDM |
Parallel transmission |
| Lane Wavelength |
850-910nm |
850nm |
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, 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:
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ISO 9001: Certified quality management and production consistency.
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CE & FCC: Fully compliant for seamless Global Market Access.
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RoHS: Committed to environmental responsibility and hazardous material control.
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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:
