{"id":22604,"date":"2026-08-31T10:33:52","date_gmt":"2026-08-31T10:33:52","guid":{"rendered":"https:\/\/www.tarluz.com\/?p=22604"},"modified":"2026-08-31T10:33:52","modified_gmt":"2026-08-31T10:33:52","slug":"introduction-to-dac-acc-aec-and-aoc","status":"publish","type":"post","link":"https:\/\/www.tarluz.com\/fr\/aoc\/introduction-to-dac-acc-aec-and-aoc\/","title":{"rendered":"Introduction to DAC, ACC, AEC, and AOC"},"content":{"rendered":"

These four cable types are common interconnect solutions used in data centers and AI clusters for high\u2011speed data transmission. Their primary differences lie in the\u00a0<\/span>transmission medium<\/span><\/strong>\u00a0(copper or optical fiber) and the\u00a0<\/span>signal enhancement method<\/span><\/strong>\u00a0(passive, active analog, or active digital), which determine their performance in terms of\u00a0<\/span>transmission distance, cost, and power consumption<\/span><\/strong>.<\/span><\/p>\n

Core Concepts<\/span><\/h3>\n
    \n
  • \n

    DAC (Direct Attach Copper Cable)<\/span><\/strong>\u00a0\u2013\u00a0<\/span>Passive copper cable<\/span><\/strong>. This is the most basic solution, consisting only of copper wire and connectors at both ends, with no active electronic components. Signals are transmitted directly over the copper without any external power.<\/span><\/p>\n<\/li>\n

  • \n

    ACC (Active Copper Cable)<\/span><\/strong>\u00a0\u2013\u00a0<\/span>Active copper cable<\/span><\/strong>. It builds on DAC by integrating\u00a0<\/span>signal driver (Redriver)<\/span><\/strong>\u00a0chips at both ends. These chips use\u00a0<\/span>analog<\/span><\/strong>\u00a0amplification and equalization to compensate for signal attenuation over copper.<\/span><\/p>\n<\/li>\n

  • \n

    AEC (Active Electrical Cable)<\/span><\/strong>\u00a0\u2013\u00a0<\/span>Active copper cable<\/span><\/strong>. Similar to ACC, but it incorporates more advanced\u00a0<\/span>Retimer<\/span><\/strong>\u00a0chips. Retimers use\u00a0<\/span>digital<\/span><\/strong>\u00a0signal processing to not only amplify but also\u00a0<\/span>retime, reshape, and re\u2011drive<\/span><\/strong>\u00a0the signal, effectively eliminating jitter and noise.<\/span><\/p>\n<\/li>\n

  • \n

    AOC (Active Optical Cable)<\/span><\/strong>\u00a0\u2013\u00a0<\/span>Active optical cable<\/span><\/strong>. It uses\u00a0<\/span>optical fiber<\/span><\/strong>\u00a0as the transmission medium, with electro\u2011optical conversion modules at both ends. Electrical signals are converted to optical signals for transmission over fiber and then converted back to electrical signals at the receiver.<\/span><\/p>\n<\/li>\n<\/ul>\n

    Comparison Table<\/span><\/h3>\n\n\n\n\n\n\n\n\n\n\n\n
    Feature<\/span><\/th>\nDAC (Passive Copper)<\/span><\/th>\nACC (Active Copper)<\/span><\/th>\nAEC (Active Electrical Cable)<\/span><\/th>\nAOC (Active Optical Cable)<\/span><\/th>\n<\/tr>\n<\/thead>\n
    Transmission Medium<\/span><\/strong><\/td>\nCopper<\/span><\/td>\nCopper<\/span><\/td>\nCopper<\/span><\/td>\nOptical Fiber<\/span><\/td>\n<\/tr>\n
    Signal Enhancement<\/span><\/strong><\/td>\nNone<\/span><\/td>\nActive, analog amplification (Redriver)<\/span><\/td>\nActive, digital retiming (Retimer)<\/span><\/td>\nActive, electro\u2011optical conversion<\/span><\/td>\n<\/tr>\n
    Power Required<\/span><\/strong><\/td>\nNo<\/span><\/td>\nYes<\/span><\/td>\nYes<\/span><\/td>\nYes<\/span><\/td>\n<\/tr>\n
    Transmission Distance<\/span><\/strong><\/td>\nShort (2\u20113 m, up to 5\u20117 m)<\/span><\/td>\nShort\u2011medium (2\u20115 m)<\/span><\/td>\nMedium (4\u20119 m)<\/span><\/td>\nLong (100 m \u2013 10 km)<\/span><\/td>\n<\/tr>\n
    Cost Level<\/span><\/strong><\/td>\nLow<\/span><\/td>\nMedium\u2011low<\/span><\/td>\nMedium\u2011high<\/span><\/td>\nHigh<\/span><\/td>\n<\/tr>\n
    Power Consumption<\/span><\/strong><\/td>\nVery low (~0 W)<\/span><\/td>\nLow<\/span><\/td>\nModerate<\/span><\/td>\nHigh<\/span><\/td>\n<\/tr>\n
    Cable Bulk \/ Weight<\/span><\/strong><\/td>\nBulky, heavier<\/span><\/td>\nBulky<\/span><\/td>\nCompact, lighter<\/span><\/td>\nVery compact, lightweight<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    The decision depends mainly on your\u00a0<\/span>transmission distance, budget, and power constraints<\/span><\/strong>.<\/span><\/p>\n

      \n
    • \n

      DAC<\/span><\/strong>\u00a0\u2013\u00a0<\/span>The optimal choice<\/span><\/strong>\u00a0for very short connections\u00a0<\/span>within the same rack<\/span><\/strong>. It offers the best cost\u2011performance and energy efficiency.<\/span><\/p>\n<\/li>\n

    • \n

      ACC \/ AEC<\/span><\/strong>\u00a0\u2013\u00a0<\/span>Balanced options<\/span><\/strong>\u00a0for\u00a0<\/span>between racks<\/span><\/strong>\u00a0or\u00a0<\/span>adjacent racks<\/span><\/strong>\u00a0(medium distances). They provide lower cost and power than AOC, and better signal integrity than DAC over longer runs.<\/span><\/p>\n<\/li>\n

    • \n

      AOC<\/span><\/strong>\u00a0\u2013\u00a0<\/span>The only choice<\/span><\/strong>\u00a0for\u00a0<\/span>long\u2011distance connections across racks or between buildings<\/span><\/strong>, but it comes with the highest cost and power consumption.<\/span><\/p>\n<\/li>\n<\/ul>\n

      Decision Logic<\/span><\/strong><\/p>\n

        \n
      • \n

        Distance is the primary factor<\/span><\/strong>. For the shortest distances where DAC works, it is the clear winner.<\/span><\/p>\n<\/li>\n

      • \n

        When distance increases and signal boosting is needed, choose between ACC and AEC based on your tolerance for cost, power, and performance.<\/span><\/p>\n<\/li>\n

      • \n

        Once the distance exceeds the copper limit (roughly 7\u20139 m), AOC becomes the only viable option.<\/span><\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

        These four cable types are common interconnect solutions used in data centers and AI clusters for high\u2011speed data transmission. Their primary differences lie in the\u00a0transmission medium\u00a0(copper or optical fiber) and the\u00a0signal enhancement method\u00a0(passive, active analog, or active digital), which determine their performance in terms of\u00a0transmission distance, cost, and power consumption. Core Concepts DAC (Direct Attach […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1928,1934,1927],"tags":[],"class_list":["post-22604","post","type-post","status-publish","format-standard","hentry","category-aoc","category-cable","category-dac"],"yoast_head":"\nIntroduction to DAC, ACC, AEC, and AOC - TARLUZ - FIBER OPTIC SUPPLIERS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tarluz.com\/fr\/aoc\/introduction-to-dac-acc-aec-and-aoc\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Introduction to DAC, ACC, AEC, and AOC\" \/>\n<meta property=\"og:description\" content=\"These four cable types are common interconnect solutions used in data centers and AI clusters for high\u2011speed data transmission. 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