{"id":6420,"date":"2024-08-23T02:42:21","date_gmt":"2024-08-23T06:42:21","guid":{"rendered":"https:\/\/mvslinks.com\/?p=6420"},"modified":"2024-11-28T12:58:34","modified_gmt":"2024-11-28T04:58:34","slug":"dac-vs-acc-what-are-they-and-their-differences","status":"publish","type":"post","link":"https:\/\/mvslinks.com\/it\/news\/blog\/dac-vs-acc-what-are-they-and-their-differences\/","title":{"rendered":"DAC vs ACC: what are they and their differences"},"content":{"rendered":"<p><span style=\"font-weight: 400\">Many connection schemes can be used to switch networks and achieve high-speed connections in different scenarios. Include Optical Module + Fiber, Active Optical Cable (AOC) and Direct Attach Cable (DAC). Direct Attach Cable can be further classified into Active ACC, AEC, and Passive DAC.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Below we will explore what DAC and ACC are and what are the differences between them.<\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mvslinks.com\/it\/news\/blog\/dac-vs-acc-what-are-they-and-their-differences\/#What_is_DAC\" >What is DAC?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mvslinks.com\/it\/news\/blog\/dac-vs-acc-what-are-they-and-their-differences\/#What_is_ACC\" >What is ACC?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mvslinks.com\/it\/news\/blog\/dac-vs-acc-what-are-they-and-their-differences\/#Comparison_of_Direct_Attach_Cable_and_Active_Copper_Cable\" >Comparison of Direct Attach Cable and Active Copper Cable<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mvslinks.com\/it\/news\/blog\/dac-vs-acc-what-are-they-and-their-differences\/#Transmission_Distance\" >Transmission Distance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mvslinks.com\/it\/news\/blog\/dac-vs-acc-what-are-they-and-their-differences\/#Redriver_and_Retimer_Chips\" >Redriver and Retimer Chips<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mvslinks.com\/it\/news\/blog\/dac-vs-acc-what-are-they-and-their-differences\/#Cost\" >Cost<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mvslinks.com\/it\/news\/blog\/dac-vs-acc-what-are-they-and-their-differences\/#Weight\" >Weight<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mvslinks.com\/it\/news\/blog\/dac-vs-acc-what-are-they-and-their-differences\/#Application\" >Applicazione<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mvslinks.com\/it\/news\/blog\/dac-vs-acc-what-are-they-and-their-differences\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_DAC\"><\/span><span style=\"font-weight: 400\">What is DAC?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400\"><a href=\"https:\/\/mvslinks.com\/it\/\" target=\"_blank\" rel=\"noopener\">DAC (Direct Attach Cable)<\/a> are primarily used for high-speed, short-distance connections, such as servers and GPU connecting to TOR switches<\/span><\/p>\n<p><span style=\"font-weight: 400\">It directly connects two devices through copper media and provides efficient and low-latency data transmission.<\/span><\/p>\n<figure id=\"attachment_6423\" aria-describedby=\"caption-attachment-6423\" style=\"width: 392px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-6423\" src=\"https:\/\/mvslinks.com\/wp-content\/uploads\/2024\/08\/MVSLINK-10G-SFP-to-SFP-Passive-Direct-Attach-Copper-Cable.jpg\" alt=\"MVSLINK-10G SFP+ to SFP+ Passive Direct Attach Copper Cable 10G ACC\" width=\"392\" height=\"392\" srcset=\"https:\/\/mvslinks.com\/wp-content\/uploads\/2024\/08\/MVSLINK-10G-SFP-to-SFP-Passive-Direct-Attach-Copper-Cable.jpg 900w, https:\/\/mvslinks.com\/wp-content\/uploads\/2024\/08\/MVSLINK-10G-SFP-to-SFP-Passive-Direct-Attach-Copper-Cable-500x500.jpg 500w, https:\/\/mvslinks.com\/wp-content\/uploads\/2024\/08\/MVSLINK-10G-SFP-to-SFP-Passive-Direct-Attach-Copper-Cable-100x100.jpg 100w, https:\/\/mvslinks.com\/wp-content\/uploads\/2024\/08\/MVSLINK-10G-SFP-to-SFP-Passive-Direct-Attach-Copper-Cable-768x768.jpg 768w\" sizes=\"(max-width: 392px) 100vw, 392px\" \/><figcaption id=\"caption-attachment-6423\" class=\"wp-caption-text\">MVSLINK-10G SFP+ to SFP+ Passive Direct Attach Copper Cable 10G ACC<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"What_is_ACC\"><\/span><span style=\"font-weight: 400\">What is ACC?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400\"><a href=\"https:\/\/mvslinks.com\/it\/\" target=\"_blank\" rel=\"noopener\">ACC (Active Copper Cable)<\/a> can transmit over distances 2-3 times longer than DAC. The active chips used in ACC can be divided into Redriver and Retimer, which are used to compensate for the attenuation and distortion of the signal in the transmission process, to ensure the integrity and stability of the signal.<\/span><\/p>\n<p><span style=\"font-weight: 400\">ACC performs well in short &#8211; and medium-distance connections inside the data center, especially for scenarios that require high-speed transmission over long distances.<\/span><\/p>\n<figure id=\"attachment_6422\" aria-describedby=\"caption-attachment-6422\" style=\"width: 413px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-6422\" src=\"https:\/\/mvslinks.com\/wp-content\/uploads\/2024\/08\/MCA7J75-product-picture.jpg\" alt=\"NVIDIA MCA7J75 Compatible 800G Twin-port OSFP to 4x200G QSFP112 InfiniBand NDR Breakout Active Copper Cable 800G ACC\" width=\"413\" height=\"413\" srcset=\"https:\/\/mvslinks.com\/wp-content\/uploads\/2024\/08\/MCA7J75-product-picture.jpg 1000w, https:\/\/mvslinks.com\/wp-content\/uploads\/2024\/08\/MCA7J75-product-picture-500x500.jpg 500w, https:\/\/mvslinks.com\/wp-content\/uploads\/2024\/08\/MCA7J75-product-picture-100x100.jpg 100w, https:\/\/mvslinks.com\/wp-content\/uploads\/2024\/08\/MCA7J75-product-picture-768x768.jpg 768w\" sizes=\"(max-width: 413px) 100vw, 413px\" \/><figcaption id=\"caption-attachment-6422\" class=\"wp-caption-text\">NVIDIA MCA7J75 Compatible 800G Twin-port OSFP to 4x200G QSFP112 InfiniBand NDR Breakout Active Copper Cable 800G ACC<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Comparison_of_Direct_Attach_Cable_and_Active_Copper_Cable\"><\/span><span style=\"font-weight: 400\">Comparison of Direct Attach Cable and Active Copper Cable<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Transmission_Distance\"><\/span><span style=\"font-weight: 400\">Transmission Distance<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">400G DAC transmission distance is usually less than 3 meters, while ACC transmission range is usually 5-6 meters. 800G DAC typically has a transmission distance of less than 2 meters, while ACC can transmit 4-5 meters.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Redriver_and_Retimer_Chips\"><\/span><span style=\"font-weight: 400\">Redriver and Retimer Chips<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">ACC has Redriver and Retimer chips, while DAC does not.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cost\"><\/span><span style=\"font-weight: 400\">Cost<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">DAC costs less than ACC and ACC costs less than AOC. ( DAC&lt; ACC&lt;AOC)<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Weight\"><\/span><span style=\"font-weight: 400\">Weight<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">Both of them are heavy. The weight of the DAC depends on the bandwidth and the diameter of the cable. For ACC, it adds Retimer chips, etc. so it gets heavier.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Application\"><\/span><span style=\"font-weight: 400\">Applicazione<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">DAC is usually used for short-distance connections, such as connections within or between cabinets. While ACC is more suitable for slightly longer transmission distances, such as cross-cabinet connections in data centers. In addition, ACC has a higher data rate.<\/span><\/p>\n<p><span style=\"color: #3366ff\">More details of the Comparison are listed in the following Table 1.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400\">Comparison Item<\/span><\/td>\n<td><span style=\"font-weight: 400\">Direct Attach Cable(Passive)<\/span><\/td>\n<td><span style=\"font-weight: 400\">Active Copper Cable<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400\">400G Transmission Distance<\/span><\/td>\n<td><span style=\"font-weight: 400\">&lt;3m<\/span><\/td>\n<td><span style=\"font-weight: 400\">5-6m<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400\">800G Transmission distance<\/span><\/td>\n<td><span style=\"font-weight: 400\">&lt;2m<\/span><\/td>\n<td><span style=\"font-weight: 400\">4-5m<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400\">Consumo di energia<\/span><\/td>\n<td><span style=\"font-weight: 400\">Low<\/span><\/td>\n<td><span style=\"font-weight: 400\">Low<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400\">Cost<\/span><\/td>\n<td><span style=\"font-weight: 400\">Low<\/span><\/td>\n<td><span style=\"font-weight: 400\">Medium<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400\">Weight<\/span><\/td>\n<td><span style=\"font-weight: 400\">The higher the bandwidth, the larger the wire diameter, and the heavier the weight.<\/span><\/td>\n<td><span style=\"font-weight: 400\">heavy<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400\">Applicazione<\/span><\/td>\n<td><span style=\"font-weight: 400\">Short Range, such as connections inside cabinets or between cabinets<\/span><\/td>\n<td><span style=\"font-weight: 400\">Mid-range, extending the DAC&#8217;s distance to longer<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400\">\u00a0Table 1<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><span style=\"font-weight: 400\">Conclusion<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400\">\u00a0Direct Attach Cable and Active Copper Cable are both connection schemes used in switched networks, but they differ in transmission distance, cost, and weight. Therefore, users can choose them according to the applications.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Many connection schemes can be used to switch networks and achieve high-speed connections in different scenarios. Include Optical Module + Fiber, Active Optical Cable (AOC) and Direct Attach Cable (DAC). Direct Attach Cable can be further classified into Active ACC, AEC, and Passive DAC. Below we will explore what DAC and ACC are and what [&hellip;]<\/p>","protected":false},"author":2,"featured_media":6424,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"postBodyCss":"","postBodyMargin":[],"postBodyPadding":[],"postBodyBackground":{"backgroundType":"classic","gradient":""},"footnotes":""},"categories":[1],"tags":[],"post_folder":[],"class_list":["post-6420","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v24.8.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>DAC vs ACC: what are they and their differences - mvslinks.com<\/title>\n<meta name=\"description\" content=\"What is DAC? What is ACC? 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