InfiniBand 200Gbps QSFP56 DAC/AOC Cable and Transceiver Solutions

Posted on Dec 21, 2023 by

In the rapidly evolving landscape of data centers and artificial intelligence, the demand for high-speed, low-latency, and low-power data transmission has become indispensable. FS offers a diverse range of InfiniBand cables and transceiver products tailored to various high-performance computing scenarios. This article aims to outline the features and application environments of FS 200G InfiniBand HDR AOC cables, DAC cables, and transceivers, providing insights into the latest advancements.

InfiniBand 200G QSFP56 AOC

The InfiniBand 200G QSFP56 AOC cables seamlessly integrate fiber optic and electronic chip technologies, delivering benefits such as high-speed transmission, long-distance capability, low power consumption, robust anti-interference, and flexible installation. Widely applied in data communication, data centers, and high-performance computing, FS offers two types of InfiniBand HDR AOC: direct and breakout. These AOC ensure high transmission reliability through their low power consumption, minimal electromagnetic interference, and effective heat dissipation.


The NVIDIA InfiniBand QSFP56 200G AOC cable, an active optical cable based on QSFP56 VCSEL, provides extended transmission distances compared to passive copper cables within data centers. Available in lengths of 1m, 2m, 3m, 5m, 10m, 15m, 20m, and 30m, 50m, 100m, it is designed for 200Gb/s InfiniBand HDR systems. Supporting hot-plugging, these AOC facilitate easy installation and replacement, offering higher port bandwidth, density, and configurability at a lower cost. However, they are not suitable for inter-cabinet cabling due to modules on both ends, typically used in scenarios with distances less than 30 meters.

InfiniBand QSFP56 200G AOC

HDR 200G QSFP56 to 2x 100G QSFP56 AOC

The NVIDIA InfiniBand 200G QSFP56 to 2x100G QSFP56 breakout AOC cable, an economical 200Gb/s HDR to 2x100Gb/s HDR100 active breakout AOC, is based on QSFP56 VCSEL. With lengths ranging from 1m to 30m, it facilitates interconnection between a 200G port and two 100G ports, offering efficient connectivity for short-distance interconnects. This setup achieves higher port bandwidth, density, and configurability at a reduced cost, lowering power requirements in data centers.200G QSFP56 to 2x100G Breakout AOC

HDR 2x200G QSFP56 to 2x 200G QSFP56 AOC

The NVIDIA InfiniBand 2x200G QSFP56 to 2x200G QSFP56 breakout AOC cable is based on QSFP56 VCSEL. With lengths ranging from 3m to 30m. This breakout cable is compliant with SFF-8665, SFF-8636 and InfiniBand HDR. It provides a connection from the two QSFP56 200G ports on one end to two QSFP56 200G ports on the other end and is suitable for connections between ToR/leaf switches and spine switches with fat-tree spine redundancy.

2x200G QSFP56 to 2x200G QSFP56 Breakout AOC

Connection Environment

The diagram illustrates a high-bandwidth, low-latency, and highly reliable InfiniBand connection scheme. Breakout AOC cables connect Leaf switches to GPU servers with HCA cards and storage devices, while direct AOC cables link to the Spine Switch at the same rate.

AOC cconnection

InfiniBand 200G QSFP56 DAC

FS provides InfiniBand 200G QSFP56 DAC cables, offering a cost-effective solution for creating high-speed, low-latency 200G/HDR connections in InfiniBand switching networks. Different lengths are available to meet the distance requirements of NVIDIA GPU-accelerated HPC end-to-end systems.


The passive NVIDIA InfiniBand QSFP56 200G DAC cable is a direct attach copper cable adhering to the 200Gb/s InfiniBand HDR standard. Comprising eight high-speed copper pairs, each capable of transmitting data at up to 50Gb/s, cable lengths range from 0.5m to 2m.

InfiniBand QSFP56 200G DAC cable

HDR 200G QSFP56 to 2xQSFP56 DAC

The NVIDIA InfiniBand QSFP56 200G to QSFP56 2x100G DAC cable is a breakout cable designed in accordance with the 200Gb/s InfiniBand HDR standard. Distinguishing itself from the 200G HDR QSFP56 to QSFP56 DAC, this DAC cable establishes a connection with a 200G QSFP56 port on one end and can concurrently connect to two 100G QSFP56 ports on the other end. This configuration facilitates high-speed data transmission, bridging the gap from 200G to 100G. Available in cable lengths of 0.5m, 1m, 1.5m, and 2m, it offers flexibility to suit various deployment scenarios.

QSFP56 200G to QSFP56 2x100G DAC

Shared Features:

  • Each QSFP56 port includes an EEPROM providing host-readable product information.

  • Efficient short-distance interconnectivity for higher port bandwidth, density, and configurability.

  • Low latency, high bandwidth, low power consumption, and exceptional reliability.

  • Applications in data centers, artificial intelligence, and other fields, especially in scenarios requiring high-speed data transmission.

Connectivity Environment

The diagram showes the utilization of FS HDR InfiniBand DAC cables for short-distance connections between ToR switches and switches/servers.

HDR DAC connection1

HDR DAC connection2

InfiniBand HDR QSFP56 Transceivers

200Gbase SR4 QSFP56

The NVIDIA InfiniBand MMA1T00-HS compatible QSFP56 200G SR4 optical transceiver, featuring a QSFP56 form factor and MPO/MTP-12 UPC connectors, is purpose-built for short-distance applications in 200Gb/s InfiniBand environments. Employing 4 channels of 53Gb/s PAM4 850nm VCSEL transmitters and PIN receivers, it incorporates built-in CDR chips for both transmit and receive channels with power consumption below 5W. This transceiver can transmit up to 100m over OM4 multimode fiber cable with FEC enabled.

200G SR4 QSFP56

200Gbase FR4 QSFP56

The NVIDIA InfiniBand MMS1W50-HM compatible QSFP56 200G FR4 optical module, designed for medium to long-distance applications in 200Gb/s HDR InfiniBand, utilizes duplex LC connectors and the QSFP56 form factor. Employing a non-cpoled EML CWDM transmitter, it multiplexes into a single optical data stream using wavelength division multiplexing technology and demultiplexes into four optical data streams at the receiving end with an optical demultiplexer. This transceiver can transmit distances of up to 2km over 1310nm OS2 single-mode fiber, effectively reducing fiber cabling costs for customers.

200G FR4 QSFP56

Application Environment of HDR InfiniBand Transceivers

The specific application of these optical modules depends on the requirements of the current environment, considering the different features and functions of each module. The 200G HDR SR4 is suitable for interconnectivity between InfiniBand HDR devices, like switch-to-network cards or switch-to-switch connections, with transmission distance requirements ranging from 30m to 100m.

The 200Gbase HDR FR4 is specifically designed for network environments with transmission distances of 500 meters to 2 kilometers. It is ideal for medium to long-distance systems in InfiniBand, extending InfiniBand to remote infrastructures and edges. This allows for local and encrypted InfiniBand connections between remote data centers or data centers and remote storage infrastructures, facilitating high availability.

200G HDR SR4 connection


In summary, FS HDR InfiniBand AOC cables, DAC cables, and optical transceivers offer low latency, high bandwidth, low power consumption, and high reliability. They have found widespread applications in data centers, artificial intelligence, and various fields, earning acclaim from customers.


Q1: Can InfiniBand cables be used on switches that are not Mellanox?

FS provides InfiniBand cables compatible with devices other than Mellanox switches, as long as the switches are reasonably compatible, such as Huasan and Huawei.

Q2: Can InfiniBand cables be used on Ethernet switches?

InfiniBand cables provided by FS are compatible with both InfiniBand and Ethernet, while Ethernet cables are only compatible with Ethernet.

Q3: What is the latency and bandwidth of HDR InfiniBand cables?

The latency of InfiniBand cables provided by FS is 1.27μs, and the bandwidth is 200Gbps.

Q4: What lasers are used in 200G transceivers?

Lasers are divided into two categories: Direct Modulation (DML) and External Modulation (EML). Directly modulated lasers include VCSEL, FP, DFB, mainly for close range and low-power scenarios. EML lasers, consisting of CW laser and EAM modulator, are used for high-speed or long-distance scenarios.

Q5: How many modulation methods are available for 200G transceivers?

There are two modulation methods: PAM4 modulation and NRZ modulation. The 200G QSFP56 adopts 4x50G PAM4 modulation, while 200G QSFP-DD adopts 8x25G NRZ modulation.

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