400G OSFP DAC ( Passive Direct Attach Copper) enables high-bandwidth 400G links and supports 400G Ethernet rate. It is high-speed, cost-effective alternatives to OSFP optics in 400G Ethernet applications. The 400G OSFP DAC cable contains 16 (8 transmitting and 8 receiving) high-speed copper pairs, each operating at data rates of up to 53Gb/s, which are suitable for very short links and offer a cost-effective and power-efficient way to establish a 400-Gigabit link between QSFP-400G ports of switches/routers within racks and across adjacent racks. The cable assembly meets IEEE 802.3cd 200GBase-CR4, 100Gbase-CR2 and 50GBase-CR standards with substantial signal integrity margin providing high performance and bandwidth interconnect solutions for high-density applications. AscentOptics provide high performance OSFP-to-OSFP copper direct-attach cables in lengths of 1, 2, 2.5, and 3 meters.