Cisco QDD-400G-LR4-S Compatible 400G QSFP-DD LR4 Optical Transceiver Module | HYTOPTODEVICE

This fiber transceiver is 100% compatible with Cisco 400G routing and switching platforms that feature QSFP-DD ports. It seamlessly integrates into below platforms to utilize high speed 400G Network Transmission:

• Cisco Nexus 9000 Series Data Center Switches:

  • Nexus 9332D-GX2B / 9364C-GX / 9316D-GX

  • Nexus 9408 (with compatible line cards)

• Cisco 8000 Series Backbone Routers:

  • Cisco 8201-32FH

  • Cisco 8800 Series (via 88-LC0-32FH line cards)

• Cisco ASR 9000 Series Aggregation Services Routers:

  • ASR 9900 Series (via 400G-capable line cards like A8K-400G-100G-SE)

• Cisco NCS 5500 Series Network Convergence System:

  • NCS-55A1-32H

The Cisco QDD-400G-LR4-S is a high-performance, long-reach (10km) optical transceiver, designed to meet the massive bandwidth demands of modern networking infrastructures. Key use cases include:

• Hyperscale Data Centers: Deployed in core and aggregation layers to handle massive East-West traffic and AI/ML workload routing.

• Data Center Interconnect (DCI): Enables high-capacity, low-latency 400G links between localized data center campuses up to 10km apart over single-mode fiber.

• Service Provider & Cloud Networks: Upgrades edge and metropolitan networks to handle 5G, cloud services, and ultra-high-definition video streaming.

• Enterprise Backbones: Connects core switches and high-performance computing (HPC) environments within large corporate networks or financial institutions.

Connectivity Solutions(Applications) of 400G QSFP-DD Optical Module：
 







FAQ for 400G QSFP-DD Optical Transceiver Module       

Q1: What is the maximum transmission distance supported by the Cisco QDD-400G-LR4-S? A1: This transceiver is engineered for long-reach transmission, supporting link lengths up to 10 kilometers (10km) over standard G.652 single-mode fiber (SMF).

Q2: What wavelengths does the QDD-400G-LR4-S use? A2: It operates over a CWDM4 wavelength grid, splitting the 400G signal across four optical channels: 1271nm, 1291nm, 1311nm, and 1331nm.

Q3: What type of fiber connector and patch cable does this module require? A3: It features a standard duplex LC. You will need a single-mode duplex LC-to-LC fiber optic patch cable to establish the connection.

Q4: Which modulation technology does this transceiver utilize? A4: It uses advanced OIF 56G PAM4 (Pulse Amplitude Modulation 4-level) technology, converting 8 channels of 50Gbps electrical signals into 4 channels of 100Gbps optical signals.

Q5: Does the QDD-400G-LR4-S support Digital Diagnostics Monitoring (DDM/DOM)? A5: Yes. Real-time DDM/DOM is fully supported, allowing network administrators to monitor critical metrics such as optical launch/receive power, temperature, voltage, and laser bias current.

Q6: What does the "-S" suffix stand for, and how does it differ from "-I"? A6: The "-S" denotes Commercial/Standard temperature range ($0^\circ\text{C}$ to $70^\circ\text{C}$). Modules with an "-I" suffix are Industrial-grade, designed to handle wider temperature fluctuations.

Q7: Can I plug a QDD-400G-LR4-S module into a standard 100G QSFP28 port? A7: No. While QSFP-DD ports are backward-compatible with 100G QSFP28 optics, a 400G QSFP-DD module cannot physically fit or operate in a legacy QSFP28 port due to mechanical and electrical limitations.

Q8: Is Forward Error Correction (FEC) required for this module? A8: Yes. Per the IEEE 802.3bs standard, host platforms must enable KP4 FEC (Forward Error Correction) on the port to ensure low Bit Error Rates (BER) and link stability over the 10km distance.

Q9: Will using a third-party compatible module void my Cisco hardware warranty? A9: No. Under consumer protection laws like the Magnuson-Moss Warranty Act, OEMs cannot void your system warranty simply for using third-party peripherals. Our modules are programmed with correct EEPROM signatures to avoid "Non-Cisco transceiver" system warnings.

Q10: How do you guarantee the compatibility of this transceiver before shipping? A10: Each compatible QDD-400G-LR4-S undergoes strict 100% hardware testing on original Cisco Nexus switches and ASR routers. Live video verification of compatibility and link tests can be provided before dispatch.
  
Q11:Is QDD-400G-LR4-S hot-swappable?A11:Yes,HYTOPTODEVICE fiber transceiver modules are hot-pluggable, hot Pluggable QSFP-DD MSA Compliant.you can plug or unplug the optical module, while the device is powered on, without any damage

Q12:Why Choose HYTOPTODEVICE for  QSFP-DD-400G-LR4-S?A12: High-Speed Optical Transceiver Manufacturer China HYTOPTODEVICE ensures that the QDD-400G-LR4-S 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.

Why Network Engineers Choose HYTOPTODEVICE

HYTOPTODEVICE has supplied over 5000,000 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.

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：

   

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