The NVIDIA/Mellanox MCA7J75-N001 is an 800Gb/s twin-port OSFP to 4x 200Gb/s QSFP112 Active Copper Cable (ACC) quad breakout (aka splitter) cable for Ethernet networking. The ACC contains eight high-speed electrical copper pairs, each operating at data rates of up to 100Gb/s using 100G-PAM4 modulation. It is compliant with OSFP MSA, QSFP112 MSA (Multi-Source Agreement) and IEEE 802.3ck standards.
The OSFP end has a IHS/finned top for additional cooling, while the QSFP112 end is without cooling fins on top and uses the cooling fins located on the adapter cages. It is primarily used to link an 800Gb/s Spectrum-4 switch to four QSFP112-based 200Gb/s 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.
