Huawei T-DQ8FNS-N00 400G QSFP-DD Optical Transceiver Module

Huawei T-DQ8FNS-N00 is a high-speed 400G QSFP-DD optical transceiver module primarily manufactured by InnoLight and often utilized as an OEM part for NVIDIA Mellanox systems. It is designed for short-reach high-bandwidth data center applications using multimode fiber.

Core Technical Specifications
----------------------------------------
The module uses PAM4 modulation to achieve an aggregate 400G data rate across 8 channels.

* Form Factor: QSFP-DD (also referred to as QSFP56-DD or QSFP112 in some contexts)

* Interface: 400GBASE-SR8

* Data Rate: 400 Gbps (Aggregate); 425 Gbps (Line speed)

* Wavelength: 850 nm

* Maximum Reach: 100m over OM4 Multi-Mode Fiber (MMF) with FEC

* Connector Type: MPO-16 APC (some variants use MTP/MPO-12)

* Power Dissipation: < 10W (with DSP)

* Operating Temp: 0°C to 70°C (Commercial Grade)

Key Features
----------------------------------------
* Standards Compliance: The module is compliant with IEEE 802.3bs, QSFP-DD MSA, and CMIS standards.

* Diagnostics: Supports Digital Diagnostics Monitoring (DDM) and Digital Optical Monitoring (DOM), allowing real-time tracking of parameters like temperature and optical power.

* Performance: It features a Built-in Digital Signal Processor (DSP) and supports Host FEC (Forward Error Correction) to ensure data integrity over its reach.

* Broad Compatibility: While frequently used in NVIDIA Mellanox environments, compatible versions are available for various high-end networking vendors.

Common Applications
----------------------------------------
* Data Center Interconnects: High-density networking between aggregation switches and core routers.

* InfiniBand Networks: Supports InfiniBand NDR and high-speed Ethernet environments.

* Server Connectivity: Linking high-performance Network Interface Cards (NICs) to data center switches.