The NVIDIA/Mellanox InfiniBand MCA7J70-N005 is a 2x 400Gb/s twin-port OSFP (Octal Small Form-factor Pluggable) IHS/finned top to 4x 200G OSFP RHS/flat top active direct attached copper breakout cable. The ACC contains eight high-speed electrical copper pairs, each operating at data rates of up to 100Gb/s using 100G-PAM4 modulation. It complies with IEEE 802.3ck, CMIS 5.0, and OSFP MSA Rev 5.0 standards.
The OSFP end has a IHS/finned top for additional cooling, while the other OSFP ends are RHS/flat top modules that rely on the cooling fins integrated into the adapter cages. It is primarily used to link an 800Gb/s Quantum-2 switch to four OSFP-based 200Gb/s NDR ConnectX-7.
ACC cables integrate a redriver chip that extends reach up to 5 meters while ensuring latency, enhancing port bandwidth, density, and configurability. These power-efficient links are ideal for medium-distance connectivity in data centers, AI/HPC clusters, and cross-rack deployments.
Note: "Finned top" transceivers are now called "Integrated Heat Sink" (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 system's internal cages. This is used for both air-cooled and liquid-cooled applications for DGX, ConnectX-7, and BlueField-3 DPUS.
