Introduction
The NVIDIA MMS4A20 is an 800Gb/s single-mode optical transceiver supporting the XDR 800Gb/s InfiniBand protocol. It is used to link the Quantum-X800 QM3x00 switches using Twin-port OSF
PL 2x800Gb/s transceivers to the dual 800Gb/s ConnectX-8 mezzanine card located internally in the GB200-based, liquid cooled system. OSFP cages are located in the compute tray front-panel.
The line rate is 200Gb/s using Pulse Amplitude Modulation of 4- channels denoted as 200G-PAM4, enabling two data bits to be transferred per clock pulse. The electrical configuration is 4-channels of 200G-PAM4. The optical configuration has one, 500-meter, Datacenter Reach, 4-channel (DR4), 800Gb/s optical connector, and is a single Multiple Push-On 12-fiber, Angled Polished Connector or MPO-12/APC. One MPO-12/APC optical connector is used per transceiver.
Based on 9-um, single mode fibers, the 800G transceiver can reach up to 500-meters, supporting large GPU clusters.
The plug formfactor is a single-port OSFP (Octal Small Formfactor Plug) and uses a Riding Heat Sink (RHS) or flat-top OSFP connector with the cooling fins on top of the ConnectX-8 cage. This can also be used in liquid-cooled Riding Heat Sink (RHS) applications.
NVIDIA’s transceivers guarantee optimal operation in NVIDIA end-to- end InfiniBand systems and rigorous production testing ensures the lowest bit error rates, low-latency, and best out-of-the-box installation experience, performance, and durability.
Flat Top Transceiver
Images are for illustration purposes only. Product labels, colors, and lengths may vary.
Key Features
800G single mode transceiver
4-channels and optical modulation
OSFP Riding Heat Sink, flat top connector
1310nm EML single mode laser
Single MPO-12/APC optical connector
500m max reach
Maximum reach: 500-meters
20.5W max power
2W low-power mode
Single 3V power supply
Class 1 laser safety
Hot pluggable, RoHS compliant
OSFPmsa.org compliant
Supports CMIS 5.3 functions
Secure Firmware boot and update features
Applications
NVL72 GB200 compute trays linking ConnectX-8 mezz