NVIDIA/Mellanox MMS4A50-XM (980-9IAS0-00XM00) Compatible 1.6T OSFP 2x FR4 PAM4 InfiniBand XDR Optical Transceiver (SMF, 1271nm, 1291nm, 1311nm and 1331nm, 2km, Dual Duplex LC/UPC, DOM, IHS/Closed Finned Top)
The NVIDIA/Mellanox MMS4A50-XM (980-9IAS0-00XM00) Compatible OSFP IHS/Closed Finned Top Optical Transceiver is an InfiniBand 1.6T 2x 800Gb/s Twin-port OSFP, 2x FR4 single mode, Multiplexed, 8-channel transceiver using two, 2-fiber, LC Duplex optical connectors each carrying 4-channels of 200G-PAM4. The dual far reach 8-channel (2x FR4) design uses 200G-PAM4 electrical and optical modulation based on the CWDM4 serial, multiplexed 1310nm wavelength grid. It is qualified for use in InfiniBand XDR end-to-end systems.
The IHS/Closed Finned Top version is suitable for Quantum-X800 air-cooled and liquid-cooled switches. It is the ideal solution for supercomputing and HPC industries, seamlessly integrating into computing and storage infrastructure to ensure efficient high-performance interconnectivity. The main application is linking two switches together up to 2km.
Note: “Finned-top” transceivers are now called “Integrated HeatSink” (IHS) as the cooling fins are integrated into the OSFP connector metal top. Commonly used in air-cooled switches. “Flat-top” transceivers are now called “Riding Heat Sink” (RHS) as the cooling fins ride on top of the network card or systems internal cages. This is used for both air-cooled and liquid-cooled applications for DGX, ConnectX-7, and BlueField-3 DPUS.
| Cisco Compatible | QDD-400G-DR4-S | Vendor Name | FS |
| Form Factor | QSFP-DD | Max. Data Rate | 425Gbps (4×106.25Gb/s) |
| Wavelength | 1310nm | Max. Cable Distance | 500m |
| Connector | MPO-12 (APC) | Media | SMF |
| Transmitter Type | DFB | Receiver Type | PIN |
| TX Power | -2.9~4.0dBm | Minimum Receiver Power | -5.9dBm |
| Power Budget | 3dB | Receiver Overload | 4dBm |
| Max. Power Consumption | 10W | Extinction Ratio | 3.5dB |
| DDM/DOM | Supported | Commercial Temperature Range | 0 to 70°C (32 to 158°F) |
| Modulation (Electrical) | 8x50G-PAM4 | Modulation (Optical) | 4x100G-PAM4 |
| DSP | TX and RX | Host FEC | Supported |
| Protocols | QSFP-DD MSA, IEEE 802.3bs, CMIS 4.1 | Warranty | 5 Years |














