DAC optical module interface type
The module interfaces at both ends of DAC are the same as those of ordinary optical modules, mainly including two types: SFP and QSFP. DAC, short for Direct Attach Cable, is generally translated as Direct Attach Cable or Direct Attach Copper Cable. Each type follows distinct IEEE standards, electrical interfaces, and physical layer constraints, which directly impact transmission reach, power consumption, latency, and compatibility with switches and NICs. Understanding the differences between optical, copper, and direct attach SFP+ types is. This comparison focuses on three dominant choices— DAC/AOC pairings (Direct Attach Copper and Active Optical Cables) and Optical Modules (standalone transceivers + fiber)—to help architects pick the right solution for spine-leaf and rack-to-rack links.
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