What modulation scheme does the 400G NDR DR4 use?

Both the electrical and optical sides use a 4-channel 100G PAM4 modulation scheme.

NVIDIA/Mellanox MMS4X00-NS400 400G OSFP DR4 InfiniBand NDR Transceiver

Name: NVIDIA/Mellanox MMS4X00-NS400 Compatible 400G DR4 OSFP PAM4 1310nm 100m DOM Single MPO-12/APC InfiniBand NDR Transceiver Module for SMF (Flat Top)
Brand: Naddod
SKU: 101947
Price: 999.00 USD
Availability: OnlineOnly
Rating: 5.0 (18 reviews)

Description

NVIDIA/Mellanox® MMS4X00-NS400 Compatible 400G DR4 InfiniBand NDR Optical Transceiver Module (Single-port OSFP, 1310nm, 100m, Single MPO-12/APC, DOM, for SMF, Flat Top )

NADDOD OSFP-400G-DR4H Transceiver is a high performance, cost effective module for optical data communication applications supporting 400G InfiniBand and Ethernet. The OSFP-400G-DR4H is designed to operate in switch and router applications supporting OSFP MSA compliant traffic for up to 100m links.

Specifications

Form Factor

OSFP

Distance

100m

Wavelength

1310nm

Connector

MPO-12/APC

Power Consumption

≤9W

Transmitter

EML

Receiver

Media

SMF

Modulation（electrical）

4x106.25Gb/s PAM4

Modulation（Optical ）

4x106.25Gb/s PAM4

Case Temperature(℃)

0~70°C(32 to 158°F)

Protocol

IB NDR , 400G Ethernet Compliant

Applications

Product Highlights

400G OSFP DR4 Provides Unmatched Flexibility and Cost-Efficiency

NADDOD 400G OSFP DR4 single-mode parallel transceivers use a single, 4-channel MPO-12/APC optical connector with a maximum fiber reach of 100 meters. It is highly compatible with OSFP NICs, enabling interconnection to 800G switches and flexible link configuration with adaptive 200G speed reduction for 800G to 2x400G and 800G to 4x200G connections.

Why NADDOD

Module Availability

Worry-Free - Rigorous authentic testing!
Multi-version Device Compatibility

Multi-Version - Easy adaptation for each module!
High-Performance

Actual Test Data-Better results intuitively!

Our Approach

Test scene

Based on the experience in high-speed optical module design, NADDOD 400G OSFP DR4 modules use state-of-the-art thermal techniques to maintain superior operation in high-density, large-scale cluster settings, effectively averting overheating problems that could impact link stability.

Test result

QM9700 Version: 3.11.3002

MCX75310AAS-NEAT Version: 28.40.1000

Contact us for more version testing

Multi-Version

Switch Side Testing
NIC Side Testing

Multi-Version Testing

NADDOD 400G OSFP DR4 undergoes rigorous testing to ensure compatibility with various hardware and software, as well as long-term stability. This reduces incompatibility issues caused by firmware upgrades, providing reliable connectivity and exceptional performance.
Connectivity

Switch Side Testing
NIC Side Testing

Connectivity Testing

NADDOD optical modules are perfectly compatible with mainstream network devices in the market, seamlessly integrating and maintaining stable optical link connections, demonstrating unparalleled stability and reliability.
BER

Switch Side Testing
NIC Side Testing

BER Testing

NADDOD optical module features a low bit error rate (BER). In LL FEC (272,257) testing, the 400G OSFP DR4 module demonstrates a BER that remains relatively consistent with NVIDIA's original specifications (around -8~-10) before error correction. After error correction, the BER approaches zero. Maintaining a low BER helps prevent link jitter issues caused by high error rates, ensuring the stability of cluster performance and large-scale model training. This contributes to simplifying customer operations and maintenance while reducing costs.

Questions & Answers

Ask a Question

Q:

Can a 400G OSFP DR4 be interconnected with an 800G 2xDR4?

A:

Yes, it is possible. The 800G dual-port NDR 2xDR4 can be connected to two 400G NDR DR4 optical modules using two single-mode MPO-12/APC jumpers.

Q:

What is the maximum transmission distance of a 400G OSFP DR4?

A:

When paired with single-mode patch cords, the 400G OSFP DR4 can achieve a distance of up to 100 meters.

Q:

Why use MPO/APC (Angled Polished Connector)?

A:

The 100G-PAM4 optoelectronic devices are very sensitive to reflections that occur within the fiber. Approximately 10% of the light reflects back to the transmitter when passing through the optical connector, causing signal distortion. APC connectors can deflect these reflected light rays.

Resources

OSFP-400G-DR4H Datasheet