Direct Attach Cable (DAC) is an integrated high-speed copper cable assembly with fixed module heads at both ends, delivering a low-cost, low-power solution for short-distance high-speed interconnection in data centers. Direct attach cables require no additional optical transceivers or fiber patch cords, supporting plug-and-play and hot swapping. Direct attach cables support data rates of 10G/25G/40G/100G in passive and active types; passive versions cover 1–5 meters, while active versions reach 7–15 meters, compatible with SFP+, SFP28, QSFP+, QSFP28 and other mainstream packages. Featuring ultra-low latency, high signal integrity, anti-electromagnetic interference and flexible cabling, they are compatible with mainstream switches, servers and storage devices, comply with industry standards, and are widely used in in-cabinet interconnection, rack-to-rack links and server clusters, serving as a cost-effective alternative to fiber solutions for short-reach applications.