{"id":101750,"date":"2026-11-02T14:25:05","date_gmt":"2026-11-02T14:25:05","guid":{"rendered":"https:\/\/optics.carritech.com\/?p=101750"},"modified":"2026-11-02T17:14:06","modified_gmt":"2026-11-02T17:14:06","slug":"dac-aoc-cables","status":"publish","type":"post","link":"https:\/\/optics.carritech.com\/pt\/dac-aoc-cables\/","title":{"rendered":"DAC and AOC cables: what to buy when optics are the wrong answer"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Almost every buying guide on this site ends the same way: inside the rack, do not buy optics at all. This is the article that says what to buy instead.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The reasoning is hard to argue with. Two transceivers and a patch lead cost more than a cable, draw between two and forty watts depending on the speed, add two optical connectors and two ferrules to keep clean, and introduce an optical budget you have to manage. A direct attach copper cable does the same job for less money, draws essentially nothing, adds no optical interfaces at all and cannot be contaminated by dust. For a three-metre link between a server and the switch above it, there is no version of the arithmetic where optics win.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What the guides do not usually say is which cable, and that turns out to be less obvious than it looks. There are three different products here rather than two, the reach you can expect halves roughly every generation, the point at which copper stops working has moved, and at 25 gigabits and above these assemblies became full IEEE standard interfaces in a way the 10G ones never were. This guide covers all of it, and lists the 105 assemblies Carritech holds from 10G to 1.6T.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Three products, not two<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">&quot;DAC or AOC&quot; is the usual framing and it leaves out the one in the middle, which is increasingly the interesting one.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Passive DAC.<\/strong> Twinaxial copper with a connector shell at each end containing nothing but an EEPROM. No power, no electronics, no latency beyond propagation delay. The host&#8217;s own transmitter drives the copper directly. The cheapest and most reliable link available at any speed, within its reach.<\/li>\n<li><strong>Active copper (ACC or AEC).<\/strong> The same copper with signal conditioning built into the connector. A retimer or equaliser cleans up the signal, which buys back the reach that rising lane rates take away. It draws some power and adds a little latency, and it is the answer when the passive part is a metre short.<\/li>\n<li><strong>AOC.<\/strong> Not a cable with electronics in it but <strong>a pair of optical transceivers with the fibre permanently attached<\/strong>. It behaves like a cable &mdash; no connectors to clean, no polarity to get wrong, nothing to patch &mdash; but it draws transceiver power at both ends and it is an optical link in every other respect. Lighter and far more flexible than copper, which at high lane counts is the deciding factor more often than reach is.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Our guide to <a href=\"https:\/\/optics.carritech.com\/pt\/dac-vs-aoc\/\">DAC vs AOC<\/a> compares the first and the last in detail, and <a href=\"https:\/\/optics.carritech.com\/pt\/dac-cables\/\">direct attach cables<\/a> covers the general case. What follows is the part that decides which one goes in the purchase order.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The thing nobody tells you: a 10G DAC is not a standard, and a 25G one is<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the single most useful fact in this guide, and it explains a great deal of otherwise baffling behaviour.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Copper cable assemblies entered IEEE 802.3 early. <a href=\"https:\/\/www.ieee802.org\/3\/ak\/index.html\" target=\"_blank\" rel=\"noopener\">IEEE 802.3ak-2004<\/a>, approved on 9 February 2004, created the 10GBASE-CX4 task force and with it the first four-lane copper 10G interface &mdash; a bulky assembly on a connector nobody missed. But <strong>the SFP+ direct attach cable that actually took over the rack is not an IEEE PMD at all<\/strong>. It is specified in the SFP+ MSA document held in the <a href=\"https:\/\/www.snia.org\/technology-communities\/sff\/specifications\" target=\"_blank\" rel=\"noopener\">SNIA SFF specifications<\/a> library, alongside the rest of the SFP+ electrical specification. Copper at 10G in an SFP+ cage is an industry agreement, not a standard Ethernet port type.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then it changed. The IEEE built out copper cable assembly PMDs properly, one generation at a time:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>Amendment<\/th><th>Approved<\/th><th>What it added<\/th><\/tr><\/thead>\n<tbody><tr><td><a href=\"https:\/\/www.ieee802.org\/3\/ak\/index.html\" target=\"_blank\" rel=\"noopener\">IEEE 802.3ak-2004<\/a><\/td><td>9 February 2004<\/td><td>10GBASE-CX4, the first copper 10G assembly<\/td><\/tr><tr><td><a href=\"https:\/\/www.ieee802.org\/3\/ba\/index.html\" target=\"_blank\" rel=\"noopener\">IEEE 802.3ba-2010<\/a><\/td><td>June 2010<\/td><td>40 and 100 Gigabit Ethernet, including four-lane copper<\/td><\/tr><tr><td><a href=\"https:\/\/www.ieee802.org\/3\/bj\/index.html\" target=\"_blank\" rel=\"noopener\">IEEE 802.3bj-2014<\/a><\/td><td>June 2014<\/td><td>O <strong>100 Gb\/s Backplane and Copper Cable<\/strong> task force &mdash; four-lane 100G copper<\/td><\/tr><tr><td><a href=\"https:\/\/www.ieee802.org\/3\/by\/index.html\" target=\"_blank\" rel=\"noopener\">IEEE 802.3by-2016<\/a><\/td><td>30 June 2016<\/td><td>25 Gigabit Ethernet, including single-lane copper<\/td><\/tr><tr><td><a href=\"https:\/\/www.ieee802.org\/3\/cd\/index.html\" target=\"_blank\" rel=\"noopener\">IEEE 802.3cd-2018<\/a><\/td><td>5 December 2018<\/td><td>50, 100 and 200 Gigabit Ethernet copper assemblies<\/td><\/tr><tr><td><a href=\"https:\/\/www.ieee802.org\/3\/ck\/index.html\" target=\"_blank\" rel=\"noopener\">IEEE 802.3ck-2022<\/a><\/td><td>21 September 2022<\/td><td>100 Gb\/s per electrical lane, which is what 400G copper rests on<\/td><\/tr><tr><td><a href=\"https:\/\/www.ieee802.org\/3\/df\/index.html\" target=\"_blank\" rel=\"noopener\">IEEE 802.3df-2024<\/a><\/td><td>16 February 2024<\/td><td>400 and 800 Gigabit Ethernet<\/td><\/tr><\/tbody>\n<\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Look at the name of the 2014 one. The task force was called <em>100 Gb\/s Backplane and Copper Cable<\/em> &mdash; copper assemblies were not an afterthought bolted onto an optical standard, they were half the project. From 25 gigabits onward a DAC is a first-class Ethernet interface with a defined channel, a defined compliance methodology and mandatory forward error correction. Three things follow for a buyer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Above 10G, cross-vendor interoperability is a standards question with an answer.<\/strong> At 10G it is a specification-overlap question, which is why 10G DACs are the ones that occasionally behave oddly between two vendors&#8217; switches.<\/li>\n<li><strong>Above 10G, the FEC is part of the interface and is not optional.<\/strong> A copper link at 25G and beyond assumes error correction is running. At 10G there is none &mdash; see <a href=\"https:\/\/optics.carritech.com\/pt\/forward-error-correction-explained\/\">forward error correction explained<\/a> for why that changes how you read an error counter.<\/li>\n<li><strong>The channel specification includes the host.<\/strong> A standards-compliant cable in a non-compliant port is still a failed link, which is why &quot;this cable works in our other switch&quot; is not an argument.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Reach halves as the lane rate rises, and the catalogue shows it<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The uncomfortable trend in this part of the market is that copper is being squeezed. Every generation doubles the signalling rate on each electrical lane, and twinax loss rises with frequency, so the distance a passive cable can carry falls. You can read the whole story off the stocked lengths in our own range.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>Speed and form factor<\/th><th>Lane arrangement<\/th><th>Longest stocked passive DAC<\/th><\/tr><\/thead>\n<tbody><tr><td>10G SFP+<\/td><td>1 &times; 10.3&nbsp;Gb\/s NRZ<\/td><td><strong>7&nbsp;m<\/strong><\/td><\/tr><tr><td>25G SFP28<\/td><td>1 &times; 25.78&nbsp;Gb\/s NRZ<\/td><td><strong>7&nbsp;m<\/strong><\/td><\/tr><tr><td>40G QSFP+<\/td><td>4 &times; 10.3&nbsp;Gb\/s NRZ<\/td><td><strong>7&nbsp;m<\/strong><\/td><\/tr><tr><td>100G QSFP28<\/td><td>4 &times; 25.78&nbsp;Gb\/s NRZ<\/td><td><strong>5&nbsp;m<\/strong><\/td><\/tr><tr><td>200G QSFP-DD<\/td><td>8 &times; 25.78&nbsp;Gb\/s NRZ<\/td><td><strong>5&nbsp;m<\/strong><\/td><\/tr><tr><td>400G QSFP-DD<\/td><td>8 &times; 53.125&nbsp;Gb\/s PAM4<\/td><td><strong>5&nbsp;m<\/strong><\/td><\/tr><tr><td>800G OSFP<\/td><td>8 &times; 106.25&nbsp;Gb\/s PAM4<\/td><td><strong>3&nbsp;m<\/strong><\/td><\/tr><tr><td>1.6T OSFP<\/td><td>8 &times; 212&nbsp;Gb\/s PAM4<\/td><td><strong>active only<\/strong><\/td><\/tr><\/tbody>\n<\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Seven metres at 10G reaches across an aisle. Three metres at 800G reaches the switch at the top of your own rack and not much else. And at 1.6T the passive option has run out altogether: <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/optical-transceivers\/direct-attached-cable-dac-optical-transceivers\/1-6t-osfp-dac\/ct-1-6t-dac-x\/\">CT-1.6T-DAC-X<\/a> is an <em>active<\/em> electrical cable &mdash; eight 212&nbsp;Gb\/s PAM4 lanes each way over 16-pair 30AWG copper with 60-pin OSFP connectors, 0.5 to 3&nbsp;m, with integrated signal conditioning because without it the link would not close at all.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The clearest illustration of what active copper buys you is sitting in the 800G range. The passive <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/800g-osfp-dac\/ct-800g-odac-3\/\">CT-800G-ODAC-3<\/a> stops at 3&nbsp;m. The active <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/optical-transceivers\/direct-attached-cable-dac-optical-transceivers\/800g-osfp-dac-direct-attached-cable-dac-optical-transceivers\/ct-8osfp-acc-x\/\">CT-8OSFP-ACC-X<\/a> is the same eight 106G PAM4 lanes over the same 16-pair 30AWG construction, and <strong>integrated signal conditioning takes it to 5&nbsp;m<\/strong>. Two extra metres does not sound like much until you are trying to reach a leaf switch two racks over, at which point it is the difference between a cable and a pair of transceivers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Where this is going is worth a glance. <a href=\"https:\/\/www.ieee802.org\/3\/dj\/index.html\" target=\"_blank\" rel=\"noopener\">IEEE P802.3dj<\/a>, the task force working on 200, 400, 800&nbsp;Gb\/s and 1.6&nbsp;Tb\/s Ethernet, was still in ballot at the end of 2025, and the <a href=\"https:\/\/ethernetalliance.org\/\" target=\"_blank\" rel=\"noopener\">Ethernet Alliance<\/a> tracks the broader direction. The practical expectation is that passive copper keeps shrinking and active copper keeps absorbing what it loses.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to choose, in four lines<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The comparison is in <a href=\"https:\/\/optics.carritech.com\/pt\/dac-vs-aoc\/\">DAC vs AOC<\/a>. The decision is simpler than the comparison:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Under 3&nbsp;m, same rack: passive DAC.<\/strong> Cheapest, no power, lowest latency, nothing to clean, nothing to fail. At any speed in our range this is the right answer if the distance allows it.<\/li>\n<li><strong>Past the passive reach but still copper distance: active copper.<\/strong> At 800G that is the 3-to-5&nbsp;m band, and the part exists specifically for it.<\/li>\n<li><strong>Across a row, or where the copper is physically impossible: AOC.<\/strong> This is more often a mechanical decision than an optical one. A 400G or 800G DAC is a thick, stiff, heavy assembly, and thirty-two of them emerging from one 1U faceplate is a cable-management and airflow problem before it is anything else. An AOC weighs a fraction as much and bends.<\/li>\n<li><strong>Between racks, through a patch panel, or past AOC reach: transceivers and fibre.<\/strong> A cable assembly is a single part with no serviceable middle. If the path needs to be patched, cross-connected or re-routed later, you want structured fibre and pluggable optics.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">That last point is the honest case against everything in this article and it deserves stating properly. <strong>A DAC or AOC cannot be repaired, re-terminated or patched through.<\/strong> Damage one connector and the whole assembly is scrap, including the perfectly good transceiver at the other end of an AOC. Fibre plus modules costs more up front and is serviceable for a decade. Inside a rack that trade is clearly worth making; across a building it clearly is not.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Breakout: one port, four links<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A breakout assembly splits a multi-lane port into independent slower links &mdash; the densest and cheapest way to get lower-rate ports out of a modern line card. Carritech stocks breakout at the two speeds where it does the most work: <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdacbo-5\/\">CT-40G-QDACBO-5<\/a> and its siblings take a 40G QSFP+ port to four SFP+ links, and <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdacbo-5\/\">CT-100G-QDACBO-5<\/a> takes a 100G QSFP28 port to four 25G SFP28 links, with <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaocbo-x\/\">CT-40G-QAOCBO-X<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaocbo-x\/\">CT-100G-QAOCBO-X<\/a> doing the same in optical form including custom lengths.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two caveats apply at every speed and both catch people out. <strong>The host has to support the split, and that is a platform capability rather than a property of the cable<\/strong> &mdash; a breakout assembly in a switch that will not divide the port simply does not come up. And the four tails are four independent links, which means four port configurations, four sets of counters and four things to monitor. Our guide to <a href=\"https:\/\/optics.carritech.com\/pt\/400g-breakout-explained\/\">400G breakout<\/a> covers the mechanics, and at the higher speeds the split is done with transceivers and fan-out harnesses rather than cable assemblies &mdash; see <a href=\"https:\/\/optics.carritech.com\/pt\/400g-qsfp-dd-transceivers\/\">400G QSFP-DD transceivers<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/800g-osfp-transceivers\/\">800G OSFP transceivers<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Five things that catch people out<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. A cable has two identities, and both hosts check them<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This is the problem unique to cable assemblies and the one most often discovered on site. A transceiver has one EEPROM and faces one host. <strong>A DAC or AOC has an EEPROM at each end, and each end faces a different switch.<\/strong> If the two ends of the link are different vendors&#8217; equipment &mdash; a server NIC and a top-of-rack switch, a storage fabric and a host bus adapter, two switch generations from the same vendor with different policies &mdash; then the assembly needs the correct identification at each end independently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Plenty of suppliers can code one end. Being able to code both, to different vendors, is the difference between a cable that works and a cable that comes up on one side only. That is what <a href=\"https:\/\/optics.carritech.com\/pt\/transceiver-coding-explained\/\">transceiver coding<\/a> means for cable assemblies, and it is what the <a href=\"https:\/\/optics.carritech.com\/pt\/transceiver-coding-box\/\">Carritech Opticode coding box<\/a> does at the point of deployment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Airflow, weight and bend radius are engineering constraints, not preferences<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A fully populated row of high-speed copper is a solid wall behind the switch. It blocks exhaust air, it loads the cable management arms, and twinax has a minimum bend radius that a rack&#8217;s rear channel frequently does not respect. The failure mode is not a bad link; it is thermal shutdown of ports elsewhere in the chassis, or a cable with a kink in it that degrades over months. Our note on <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceiver-power-consumption\/\">optical transceiver power consumption<\/a> covers the heat the optics add; copper adds no heat of its own but stops you getting rid of anyone else&#8217;s.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. An AOC draws module power at both ends<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It looks like a cable and bills like a cable, but an AOC is two transceivers. At 10G that is a watt or two a side and nobody notices. At 400 and 800G it is a real contribution to a chassis power budget that may already be the binding constraint, and it is the reason the in-rack recommendation is copper first and optics second rather than the other way round.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Diagnostics vary from full to none<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A passive DAC has nothing to report beyond its own identity &mdash; no optical power, no temperature, no bias current, because there is no transmitter in it. An AOC reports as the pair of transceivers it is. Active copper sits in between: <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/optical-transceivers\/direct-attached-cable-dac-optical-transceivers\/800g-osfp-dac-direct-attached-cable-dac-optical-transceivers\/ct-8osfp-acc-x\/\">CT-8OSFP-ACC-X<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/optical-transceivers\/direct-attached-cable-dac-optical-transceivers\/1-6t-osfp-dac\/ct-1-6t-dac-x\/\">CT-1.6T-DAC-X<\/a> both expose diagnostics through the two-wire management interface, managed under the <a href=\"https:\/\/www.oiforum.com\/technical-work\/hot-topics\/management\/\" target=\"_blank\" rel=\"noopener\">OIF Common Management Interface Specification<\/a> at these speeds. If your monitoring expects optical power from every port, a rack full of passive DACs will look like a rack full of faults. It is not.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Length is not a dimension you can adjust later<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Assemblies come in fixed lengths and the one you ordered is the one you have. Too short and it does not reach; too long and you have a coil of stiff copper to find somewhere for, which at 400G and above is a genuine nuisance. Measure the route rather than the rack gap, and where a stocked length does not fit, the <strong>-X<\/strong> parts throughout the AOC range and at the top of the copper range are <strong>made to the length you specify<\/strong>. That is usually the cheaper answer than buying long and coiling.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Six checks before you order<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Measure the real cable route,<\/strong> not the straight-line distance. Rear channels, cable arms and bend radius add more than people expect.<\/li>\n<li><strong>Check the passive reach at your lane rate, not at your headline speed.<\/strong> Three metres at 800G is not five metres at 400G.<\/li>\n<li><strong>Confirm both ends&#8217; coding requirements separately.<\/strong> Two different vendors at the two ends of one cable is the normal case, not the exception.<\/li>\n<li><strong>Confirm the host supports breakout<\/strong> before buying a breakout assembly. It is a platform capability, not a cable feature.<\/li>\n<li><strong>Check the chassis power and airflow budget fully populated,<\/strong> with the cable bundle in place rather than on paper.<\/li>\n<li><strong>Decide whether the path will ever need patching.<\/strong> If it will, buy fibre and transceivers instead &mdash; a cable assembly has no serviceable middle.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">The DAC and AOC assemblies Carritech stocks<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">One hundred and five tested assemblies from 10G to 1.6T, every one coded for the equipment at both ends and tested before despatch. Lengths are the number at the end of the part code in metres; <strong>-X<\/strong> denotes a custom length made to order, <strong>BO<\/strong> a breakout assembly and <strong>ACC<\/strong> an active copper cable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Passive direct attach copper<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>10G SFP+ to SFP+, 1 to 7&nbsp;m.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/10g-sfp-dac\/ct-10g-sdac-1\/\">CT-10G-SDAC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/10g-sfp-dac\/ct-10g-sdac-2\/\">CT-10G-SDAC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/10g-sfp-dac\/ct-10g-sdac-3\/\">CT-10G-SDAC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/10g-sfp-dac\/ct-10g-sdac-4\/\">CT-10G-SDAC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/10g-sfp-dac\/ct-10g-sdac-5\/\">CT-10G-SDAC-5<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/10g-sfp-dac\/ct-10g-sdac-6\/\">CT-10G-SDAC-6<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/10g-sfp-dac\/ct-10g-sdac-7\/\">CT-10G-SDAC-7<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>25G SFP28 to SFP28, 1 to 7&nbsp;m.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/25g-sfp28-dac\/ct-25g-s28dac-1\/\">CT-25G-S28DAC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/25g-sfp28-dac\/ct-25g-s28dac-2\/\">CT-25G-S28DAC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/25g-sfp28-dac\/ct-25g-s28dac-3\/\">CT-25G-S28DAC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/25g-sfp28-dac\/ct-25g-s28dac-4\/\">CT-25G-S28DAC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/25g-sfp28-dac\/ct-25g-s28dac-5\/\">CT-25G-S28DAC-5<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/25g-sfp28-dac\/ct-25g-s28dac-6\/\">CT-25G-S28DAC-6<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/25g-sfp28-dac\/ct-25g-s28dac-7\/\">CT-25G-S28DAC-7<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>40G QSFP+ to QSFP+, 1 to 7&nbsp;m, plus 4 &times; SFP+ breakout to 5&nbsp;m.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdac-1\/\">CT-40G-QDAC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdac-2\/\">CT-40G-QDAC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdac-3\/\">CT-40G-QDAC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdac-4\/\">CT-40G-QDAC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdac-5\/\">CT-40G-QDAC-5<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdac-6\/\">CT-40G-QDAC-6<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdac-7\/\">CT-40G-QDAC-7<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdacbo-1\/\">CT-40G-QDACBO-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdacbo-2\/\">CT-40G-QDACBO-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdacbo-3\/\">CT-40G-QDACBO-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdacbo-4\/\">CT-40G-QDACBO-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/40g-qsfp-dac\/ct-40g-qdacbo-5\/\">CT-40G-QDACBO-5<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>100G QSFP28 to QSFP28, 1 to 5&nbsp;m, plus 4 &times; SFP28 breakout to 5&nbsp;m.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdac-1\/\">CT-100G-QDAC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdac-2\/\">CT-100G-QDAC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdac-3\/\">CT-100G-QDAC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdac-4\/\">CT-100G-QDAC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdac-5\/\">CT-100G-QDAC-5<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdacbo-1\/\">CT-100G-QDACBO-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdacbo-2\/\">CT-100G-QDACBO-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdacbo-3\/\">CT-100G-QDACBO-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdacbo-4\/\">CT-100G-QDACBO-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/100g-qsfp28-dac\/ct-100g-qdacbo-5\/\">CT-100G-QDACBO-5<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>200G QSFP-DD to QSFP-DD, 1 to 5&nbsp;m.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/200g-qsfp-dd-dac\/ct-200g-qdddac-1\/\">CT-200G-QDDDAC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/200g-qsfp-dd-dac\/ct-200g-qdddac-2\/\">CT-200G-QDDDAC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/200g-qsfp-dd-dac\/ct-200g-qdddac-3\/\">CT-200G-QDDDAC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/200g-qsfp-dd-dac\/ct-200g-qdddac-4\/\">CT-200G-QDDDAC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/200g-qsfp-dd-dac\/ct-200g-qdddac-5\/\">CT-200G-QDDDAC-5<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>400G QSFP-DD to QSFP-DD, 1 to 5&nbsp;m.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/400g-qsfp-dd-dac\/ct-400g-qdddac-1\/\">CT-400G-QDDDAC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/400g-qsfp-dd-dac\/ct-400g-qdddac-2\/\">CT-400G-QDDDAC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/400g-qsfp-dd-dac\/ct-400g-qdddac-3\/\">CT-400G-QDDDAC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/400g-qsfp-dd-dac\/ct-400g-qdddac-4\/\">CT-400G-QDDDAC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/400g-qsfp-dd-dac\/ct-400g-qdddac-5\/\">CT-400G-QDDDAC-5<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>800G OSFP to OSFP, 1 to 3&nbsp;m.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/800g-osfp-dac\/ct-800g-odac-1\/\">CT-800G-ODAC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/800g-osfp-dac\/ct-800g-odac-2\/\">CT-800G-ODAC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/direct-attached-cable-dac\/800g-osfp-dac\/ct-800g-odac-3\/\">CT-800G-ODAC-3<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>800G and 1.6T OSFP, active copper.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/optical-transceivers\/direct-attached-cable-dac-optical-transceivers\/800g-osfp-dac-direct-attached-cable-dac-optical-transceivers\/ct-8osfp-dac-x\/\">CT-8OSFP-DAC-X<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/optical-transceivers\/direct-attached-cable-dac-optical-transceivers\/800g-osfp-dac-direct-attached-cable-dac-optical-transceivers\/ct-8osfp-acc-x\/\">CT-8OSFP-ACC-X<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/optical-transceivers\/direct-attached-cable-dac-optical-transceivers\/1-6t-osfp-dac\/ct-1-6t-dac-x\/\">CT-1.6T-DAC-X<\/a> &mdash; the 800G active cable reaching 5&nbsp;m against the passive part&#8217;s 3&nbsp;m, and the 1.6T assembly available only as an active design. All three are custom-length parts specified to the run.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Active optical cable<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>10G SFP+ to SFP+, 1 to 6&nbsp;m plus custom lengths.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/10g-sfp-aoc\/ct-10g-saoc-1\/\">CT-10G-SAOC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/10g-sfp-aoc\/ct-10g-saoc-2\/\">CT-10G-SAOC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/10g-sfp-aoc\/ct-10g-saoc-3\/\">CT-10G-SAOC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/10g-sfp-aoc\/ct-10g-saoc-4\/\">CT-10G-SAOC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/10g-sfp-aoc\/ct-10g-saoc-5\/\">CT-10G-SAOC-5<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/10g-sfp-aoc\/ct-10g-saoc-6\/\">CT-10G-SAOC-6<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/10g-sfp-aoc\/ct-10g-saoc-x\/\">CT-10G-SAOC-X<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>25G SFP28 to SFP28, 1 to 6&nbsp;m plus custom lengths.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/25g-sfp28-aoc\/ct-25g-s28aoc-1\/\">CT-25G-S28AOC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/25g-sfp28-aoc\/ct-25g-s28aoc-2\/\">CT-25G-S28AOC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/25g-sfp28-aoc\/ct-25g-s28aoc-3\/\">CT-25G-S28AOC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/25g-sfp28-aoc\/ct-25g-s28aoc-4\/\">CT-25G-S28AOC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/25g-sfp28-aoc\/ct-25g-s28aoc-5\/\">CT-25G-S28AOC-5<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/25g-sfp28-aoc\/ct-25g-s28aoc-6\/\">CT-25G-S28AOC-6<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/25g-sfp28-aoc\/ct-25g-s28aoc-x\/\">CT-25G-S28AOC-X<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>40G QSFP+ to QSFP+, 1 to 6&nbsp;m, plus 4 &times; SFP+ breakout, all with custom lengths.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaoc-1\/\">CT-40G-QAOC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaoc-2\/\">CT-40G-QAOC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaoc-3\/\">CT-40G-QAOC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaoc-4\/\">CT-40G-QAOC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaoc-5\/\">CT-40G-QAOC-5<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaoc-6\/\">CT-40G-QAOC-6<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaoc-x\/\">CT-40G-QAOC-X<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaocbo-1\/\">CT-40G-QAOCBO-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaocbo-2\/\">CT-40G-QAOCBO-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaocbo-3\/\">CT-40G-QAOCBO-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaocbo-4\/\">CT-40G-QAOCBO-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaocbo-5\/\">CT-40G-QAOCBO-5<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/40g-qsfp-aoc\/ct-40g-qaocbo-x\/\">CT-40G-QAOCBO-X<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>100G QSFP28 to QSFP28, 1 to 5&nbsp;m, plus 4 &times; SFP28 breakout, all with custom lengths.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaoc-1\/\">CT-100G-QAOC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/100g-qsfp28-aoc-2m\/\">CT-100G-QAOC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaoc-3\/\">CT-100G-QAOC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaoc-4\/\">CT-100G-QAOC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/100g-qsfp28-aoc-5m\/\">CT-100G-QAOC-5<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaoc-x\/\">CT-100G-QAOC-X<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaocbo-1\/\">CT-100G-QAOCBO-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaocbo-2\/\">CT-100G-QAOCBO-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaocbo-3\/\">CT-100G-QAOCBO-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaocbo-4\/\">CT-100G-QAOCBO-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaocbo-5\/\">CT-100G-QAOCBO-5<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/100g-qsfp28-aoc\/ct-100g-qaocbo-x\/\">CT-100G-QAOCBO-X<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>200G QSFP-DD to QSFP-DD, 1 to 4&nbsp;m plus custom lengths.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/200g-qsfp-dd-aoc\/ct-200g-qddaoc-1\/\">CT-200G-QDDAOC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/200g-qsfp-dd-aoc\/ct-200g-qddaoc-2\/\">CT-200G-QDDAOC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/200g-qsfp-dd-aoc\/ct-200g-qddaoc-3\/\">CT-200G-QDDAOC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/200g-qsfp-dd-aoc\/ct-200g-qddaoc-4\/\">CT-200G-QDDAOC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/200g-qsfp-dd-aoc\/ct-200g-qddaoc-x\/\">CT-200G-QDDAOC-X<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>400G QSFP-DD to QSFP-DD, 1 to 4&nbsp;m plus custom lengths.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/400g-qsfp-dd-aoc\/ct-400g-qddaoc-1\/\">CT-400G-QDDAOC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/400g-qsfp-dd-aoc\/ct-400g-qddaoc-2\/\">CT-400G-QDDAOC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/400g-qsfp-dd-aoc\/ct-400g-qddaoc-3\/\">CT-400G-QDDAOC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/400g-qsfp-dd-aoc\/ct-400g-qddaoc-4\/\">CT-400G-QDDAOC-4<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/400g-qsfp-dd-aoc\/ct-400g-qddaoc-x\/\">CT-400G-QDDAOC-X<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>800G OSFP to OSFP, 1 to 3&nbsp;m plus custom lengths.<\/strong> <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/800g-osfp-aoc\/ct-800g-oaoc-1\/\">CT-800G-OAOC-1<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/800g-osfp-aoc\/ct-800g-oaoc-2\/\">CT-800G-OAOC-2<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/800g-osfp-aoc\/ct-800g-oaoc-3\/\">CT-800G-OAOC-3<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/active-optical-cable-aoc\/800g-osfp-aoc\/ct-800g-oaoc-x\/\">CT-800G-OAOC-X<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Every AOC range carries an <strong>-X<\/strong> part, which is the one to ask about when a stocked length does not fit the route. Tell us the run and we will make it to length.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where cable stops and optics start<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For completeness, the point at which you should stop reading this article and buy transceivers instead. Past about five metres of copper or the stocked AOC lengths, or wherever the path has to be patched, the answer is a module at each end and structured fibre between them. By speed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/optics.carritech.com\/pt\/products\/optical-transceivers\/sfp-optical-transceivers\/10g-duplex-sfp\/\">10G duplex SFP+<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/10g-duplex-sfp-transceivers\/\">our 10G guide<\/a>, with <a href=\"https:\/\/optics.carritech.com\/pt\/products\/optical-transceivers\/xfp\/\">XFP<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/xfp-transceivers\/\">the XFP guide<\/a> for older line cards.<\/li>\n<li><a href=\"https:\/\/optics.carritech.com\/pt\/products\/optical-transceivers\/sfp28\/25g-duplex-sfp28\/\">25G SFP28<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/25g-sfp28-transceivers\/\">our 25G guide<\/a>.<\/li>\n<li><a href=\"https:\/\/optics.carritech.com\/pt\/products\/optical-transceivers\/qsfp\/40g-qsfp\/\">40G QSFP+<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/40g-qsfp-transceivers\/\">our 40G guide<\/a>.<\/li>\n<li><a href=\"https:\/\/optics.carritech.com\/pt\/products\/optical-transceivers\/qsfp28\/100g-duplex-qsfp28\/\">100G QSFP28<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/100g-qsfp28-transceivers\/\">our 100G guide<\/a>.<\/li>\n<li><a href=\"https:\/\/optics.carritech.com\/pt\/products\/optical-transceivers\/qsfp-dd\/400g-qsfp-dd\/\">400G QSFP-DD<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/400g-qsfp-dd-transceivers\/\">our 400G guide<\/a>, with <a href=\"https:\/\/optics.carritech.com\/pt\/products\/optical-transceivers\/qsfp-dd\/200g-qsfp-dd\/\">200G QSFP-DD<\/a> alongside.<\/li>\n<li><a href=\"https:\/\/optics.carritech.com\/pt\/products\/optical-transceivers\/osfp\/800g-osfp\/\">800G OSFP<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/products\/optical-transceivers\/osfp\/1-6t-osfp\/\">1.6T OSFP<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/800g-osfp-transceivers\/\">our 800G guide<\/a>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For the in-rack cases where neither a cable nor a transceiver is quite right, <a href=\"https:\/\/optics.carritech.com\/pt\/copper-sfp-modules\/\">copper SFP modules<\/a> cover running structured copper out of a fibre port and <a href=\"https:\/\/optics.carritech.com\/pt\/media-converters\/\">media converters<\/a> cover the jobs a pluggable cannot do.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Keeping racks cabled<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Carritech Optics holds the <a href=\"https:\/\/optics.carritech.com\/pt\/products\/direct-attached-cable-dac\/\">direct attach copper<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/products\/active-optical-cable-aoc\/\">active optical cable<\/a> ranges in UK and EU stock, from <a href=\"https:\/\/optics.carritech.com\/pt\/products\/direct-attached-cable-dac\/10g-sfp-dac\/\">10G SFP+<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/products\/direct-attached-cable-dac\/25g-sfp28-dac\/\">25G SFP28<\/a> through <a href=\"https:\/\/optics.carritech.com\/pt\/products\/direct-attached-cable-dac\/40g-qsfp-dac\/\">40G QSFP+<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/products\/direct-attached-cable-dac\/100g-qsfp28-dac\/\">100G QSFP28<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/products\/direct-attached-cable-dac\/200g-qsfp-dd-dac\/\">200G QSFP-DD<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/products\/direct-attached-cable-dac\/400g-qsfp-dd-dac\/\">400G QSFP-DD<\/a> to <a href=\"https:\/\/optics.carritech.com\/pt\/products\/direct-attached-cable-dac\/800g-osfp-dac\/\">800G OSFP<\/a>, with the matching <a href=\"https:\/\/optics.carritech.com\/pt\/products\/active-optical-cable-aoc\/800g-osfp-aoc\/\">800G OSFP AOC<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/products\/active-optical-cable-aoc\/400g-qsfp-dd-aoc\/\">400G QSFP-DD AOC<\/a> assemblies alongside. <a href=\"https:\/\/optics.carritech.com\/pt\/patch-cords\/\">Patch cords<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/copper-sfp-adapters\/\">adapters<\/a> are there too.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Every assembly is coded for the equipment at <strong>both<\/strong> ends and tested before despatch &mdash; see the <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceiver-testing\/\">22 checks a module passes<\/a> and our <a href=\"https:\/\/optics.carritech.com\/pt\/transceiver-testing\/\">transceiver testing<\/a> process &mdash; and carries a <strong>garantia vital\u00edcia<\/strong>, with UK and EU stock and support behind it. On the procurement questions, <a href=\"https:\/\/optics.carritech.com\/pt\/compatible-optical-transceivers-vs-oem\/\">compatible optical transceivers vs OEM<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/third-party-transceivers-warranty\/\">do third-party optical transceivers void your warranty?<\/a> answer them straight, and our <a href=\"https:\/\/optics.carritech.com\/pt\/company\/accreditations\/\">accreditations<\/a>, <a href=\"https:\/\/optics.carritech.com\/pt\/company\/why-choose-us\/\">why choose us<\/a> e <a href=\"https:\/\/optics.carritech.com\/pt\/company\/support\/\">support<\/a> pages cover how we work. The <a href=\"https:\/\/optics.carritech.com\/pt\/knowledge-centre\/\">knowledge centre<\/a> holds the rest of the technical library, and <a href=\"https:\/\/optics.carritech.com\/pt\/ai-optical-transceivers\/\">AI and the new demand for high-speed connectivity<\/a> covers the segment buying these assemblies by the thousand.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not sure whether a run wants passive copper, active copper or an AOC, whether your switch will break a port out to four, or what identification each end of the cable needs? Tell us the two platforms and the distance and we will say. Our <a href=\"https:\/\/optics.carritech.com\/pt\/optical-transceivers\/compatibility-check\/\">compatibility checker<\/a> returns the tested Carritech equivalent of an OEM part number in seconds, <a href=\"https:\/\/optics.carritech.com\/pt\/quote-list-upload\/\">upload a whole part-number list<\/a> and we will price it, or <a href=\"https:\/\/optics.carritech.com\/pt\/request-quote\/\">request a quote<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Almost every buying guide on this site ends the same way: inside the rack, do not buy optics at all. This is the article that says what to buy instead. The reasoning is hard to argue with. Two transceivers and a patch lead cost more than a cable, draw between two and forty watts depending [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":101762,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1748,1702],"tags":[],"class_list":["post-101750","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cable-assemblies","category-guide"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>DAC and AOC Cables Explained: Reach, Breakout and Power<\/title>\n<meta name=\"description\" content=\"DAC and AOC cables explained: passive, active copper and AOC compared, why a 10G DAC is not an IEEE standard, breakout, coding both ends, 105 in stock.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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