{"id":101577,"date":"2026-08-12T15:48:06","date_gmt":"2026-08-12T15:48:06","guid":{"rendered":"https:\/\/optics.carritech.com\/?page_id=101577"},"modified":"2026-08-13T11:38:05","modified_gmt":"2026-08-13T11:38:05","slug":"cisco-optics-reference-guide","status":"publish","type":"page","link":"https:\/\/optics.carritech.com\/it\/cisco-optics-reference-guide\/","title":{"rendered":"Cisco Optics Reference Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"101577\" class=\"elementor elementor-101577\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a2ebf43 e-con-full e-flex e-con e-parent\" data-id=\"a2ebf43\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cd8e08d elementor-widget elementor-widget-html\" data-id=\"cd8e08d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<!--\n  Carritech Optics \u2014 Cisco cross-reference guide landing page\n  ============================================================\n  Pure HTML. 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One PDF you can keep on the desktop and stop googling from.<\/p>\n        <p class=\"ct-cg__lede\" style=\"margin-top:12px; font-size:16px; color:#9a9a9a;\">\n          Not everything Cisco has ever made &mdash; nobody's guide is. These are the parts we are\n          asked for most.<\/p>\n        <div class=\"ct-cg__chips\">\n          <span><b>439<\/b> part numbers<\/span>\n          <span><b>17<\/b> product families<\/span>\n          <span>100M &rarr; <b>800G<\/b><\/span>\n          <span>Matched on <b>specification<\/b><\/span>\n        <\/div>\n      <\/div>\n      <!-- ---------------------------- the gate ---------------------------- -->\n      <div class=\"ct-cg__card\" id=\"ct-cg-card\">\n        <div class=\"ct-cg__gate\">\n          <h2>Get the guide<\/h2>\n          <p class=\"sub\">Tell us where to send it. 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We do not share your address with anyone.<\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n  <!-- ======================= WHAT'S INSIDE ======================= -->\n  <section class=\"ct-cg__sec\">\n    <div class=\"ct-cg__wrap\">\n      <div class=\"ct-cg__eyebrow\">What's inside<\/div>\n      <h2>An easy-to-read comparison table. Look up the Cisco part number, see the Carritech Optics lower-cost alternative.<\/h2>\n      <p class=\"intro\">Every row pairs a Cisco part number with the Carritech Optics transceiver\n        built to the same specification, and shows you that specification so you can check the\n        match rather than trust it. Here are six real rows from the guide.<\/p>\n      <div class=\"ct-cg__preview\">\n        <div class=\"ct-cg__tablewrap\">\n          <div class=\"cap\">Sample rows &mdash; as they appear in the PDF<\/div>\n          <table>\n            <thead><tr><th>Cisco part number<\/th><th>Carritech equivalent<\/th><th>Specification<\/th><\/tr><\/thead>\n            <tbody><tr><td class=\"oem\">SFP-10G-SR-S<\/td><td class=\"ct\">CT-SFP+SR<\/td><td class=\"sp\">10GBASE-SR \u00b7 300 m OM3 \u00b7 850 nm<\/td><\/tr><tr><td class=\"oem\">GLC-LH-SMD<\/td><td class=\"ct\">CT-SFP-LX<\/td><td class=\"sp\">1000BASE-LX\/LH \u00b7 10 km \u00b7 1310 nm<\/td><\/tr><tr><td class=\"oem\">QSFP-100G-SR4-S<\/td><td class=\"ct\">CT-QSFP28-SR4<\/td><td class=\"sp\">100GBASE-SR4 \u00b7 100 m OM4 \u00b7 MPO-12<\/td><\/tr><tr><td class=\"oem\">SFP-H25G-CU3M<\/td><td class=\"ct\">CT-25G-S28DAC-3<\/td><td class=\"sp\">25GBASE-CR1 passive copper \u00b7 3 m<\/td><\/tr><tr><td class=\"oem\">SFP-10G-BX40D-I<\/td><td class=\"ct\">CT-SFP+-BX-40D<\/td><td class=\"sp\">10G BiDi \u00b7 40 km \u00b7 downstream \u00b7 TX 1330 \/ RX 1270 nm<\/td><\/tr><tr><td class=\"oem\">QDD-400G-DR4-S<\/td><td class=\"ct\">CT-400G-QDD-DR4<\/td><td class=\"sp\">400GBASE-DR4 \u00b7 500 m \u00b7 MPO-12<\/td><\/tr><\/tbody>\n          <\/table>\n        <\/div>\n        <div>\n          <!-- IMG-2 -->\n          \n            <img decoding=\"async\" src=\"https:\/\/optics.carritech.com\/wp-content\/uploads\/2026\/08\/cisco-compatibility-matcher.png\" alt=\"cisco-compatible-transceivers\"\/>\n          \n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n  <!-- ======================= FAMILIES ======================= -->\n  <section class=\"ct-cg__sec ct-cg__sec--soft\">\n    <div class=\"ct-cg__wrap\">\n      <div class=\"ct-cg__eyebrow\">Coverage<\/div>\n      <h2>17 families, 439 part numbers<\/h2>\n      <p class=\"intro\">From 100M Fast Ethernet SFPs to 800G OSFP, and the cables most\n        cross-reference guides leave out entirely. Cisco's own catalogue runs far wider than this\n        once you count every DWDM channel and every spares SKU &mdash; what is here is what we are\n        asked for and can match, which is the part that is useful to you.<\/p>\n      <ul class=\"ct-cg__fams\"><li><span class=\"n\">97<\/span><span class=\"f\">CWDM \/ DWDM SFP<\/span><\/li><li><span class=\"n\">39<\/span><span class=\"f\">SFP+ \/ XFP \u2014 10G<\/span><\/li><li><span class=\"n\">28<\/span><span class=\"f\">SFP \u2014 100M \/ 1G<\/span><\/li><li><span class=\"n\">26<\/span><span class=\"f\">Active optical cable \u2014 40G \/ 100G<\/span><\/li><li><span class=\"n\">19<\/span><span class=\"f\">Direct attach copper \u2014 40G \/ 100G<\/span><\/li><li><span class=\"n\">18<\/span><span class=\"f\">QSFP28 \u2014 100G<\/span><\/li><li><span class=\"n\">15<\/span><span class=\"f\">CFP family \u2014 100G<\/span><\/li><li><span class=\"n\">13<\/span><span class=\"f\">QSFP-DD \u2014 200\/400G &amp; BiDi<\/span><\/li><li><span class=\"n\">13<\/span><span class=\"f\">Active optical cable \u2014 10G \/ 25G<\/span><\/li><li><span class=\"n\">12<\/span><span class=\"f\">Fibre Channel<\/span><\/li><li><span class=\"n\">12<\/span><span class=\"f\">Cisco Meraki<\/span><\/li><li><span class=\"n\">11<\/span><span class=\"f\">Direct attach copper \u2014 10G \/ 25G<\/span><\/li><li><span class=\"n\">10<\/span><span class=\"f\">Active optical cable \u2014 400G<\/span><\/li><li><span class=\"n\">8<\/span><span class=\"f\">SFP28 \u2014 25G<\/span><\/li><li><span class=\"n\">8<\/span><span class=\"f\">QSFP+ \u2014 40G<\/span><\/li><li><span class=\"n\">6<\/span><span class=\"f\">Direct attach copper \u2014 200G \/ 400G<\/span><\/li><li><span class=\"n\">5<\/span><span class=\"f\">OSFP \u2014 800G<\/span><\/li><\/ul>\n    <\/div>\n  <\/section>\n  <!-- ======================= HOW MATCHING WORKS ======================= -->\n  <section class=\"ct-cg__sec\">\n    <div class=\"ct-cg__wrap\">\n      <div class=\"ct-cg__eyebrow\">How the matching works<\/div>\n      <h2>Matched on specification, never on the name<\/h2>\n      <p class=\"intro\">Two vendors can call entirely different optics \"LH\". Part-number letters are\n        not evidence, so we do not match on them.<\/p>\n      <div class=\"ct-cg__cols\">\n        <div class=\"ct-cg__tile\">\n          <div class=\"num\">1<\/div>\n          <h3>The standard does the work<\/h3>\n          <p>Optics are built to public standards &mdash; IEEE 802.3, the Fibre Channel standards,\n             and the form-factor specifications SFF-8472, SFF-8636 and CMIS. The standard belongs\n             to nobody, and it does not go end-of-sale.<\/p>\n        <\/div>\n        <div class=\"ct-cg__tile\">\n          <div class=\"num\">2<\/div>\n          <h3>Coding decides whether the link comes up<\/h3>\n          <p>What makes an optic \"a Cisco optic\" is the identity written into its EEPROM, which the\n             switch reads on insertion. Ours are coded for the platform they are going into and\n             tested in it before they ship.<\/p>\n        <\/div>\n        <div class=\"ct-cg__tile\">\n          <div class=\"num\">3<\/div>\n          <h3>The spec column is there to be used<\/h3>\n          <p>Reach, fibre type, wavelength and connector against every row. Two optics can share a\n             form factor and a speed and still be wrong for each other &mdash; the specification is\n             how you tell.<\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n  <!-- ======================= THE FINDING ======================= -->\n  <section class=\"ct-cg__sec ct-cg__sec--soft\">\n    <div class=\"ct-cg__wrap\">\n      <div class=\"ct-cg__eyebrow\">Why a guide beats a search<\/div>\n      <h2>Some of this you will not find by googling<\/h2>\n      <div class=\"ct-cg__find\">\n        <div class=\"ct-cg__quote\">\n          <p><strong>There is no Cisco part called QSFP-100G-SR-BD.<\/strong> Half the internet\n             lists one. The real parts are <strong>QSFP-100G-SR1.2<\/strong> and\n             <strong>QSFP-40\/100-SRBD<\/strong> &mdash; and Cisco states plainly that those two\n             <strong>do not interoperate with each other<\/strong>, despite publishing identical\n             wavelengths for both.<\/p>\n          <p>That is the kind of thing that costs an evening in a data hall. It is in the guide,\n             along with the BiDi upstream and downstream pairings, the reaches that differ between\n             10&nbsp;km and 40&nbsp;km parts, and the lengths Cisco sells that nobody else does.<\/p>\n        <\/div>\n        <div>\n          <!-- IMG-3 -->\n          <img decoding=\"async\" src=\"https:\/\/optics.carritech.com\/wp-content\/uploads\/2026\/08\/cisco-alternative-transceivers.png\" alt=\"cisco-alternative-transceivers\"\/>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n  <!-- ======================= TRUST ======================= -->\n  <section class=\"ct-cg__sec\">\n    <div class=\"ct-cg__wrap\">\n      <div class=\"ct-cg__eyebrow\">Stated accurately<\/div>\n      <h2>What using a compatible optic actually changes<\/h2>\n      <div class=\"ct-cg__cols\">\n        <div class=\"ct-cg__tile\">\n          <div class=\"num\">&#167;<\/div>\n          <h3>It is not a blanket void<\/h3>\n          <p>Cisco's published non-entitlement policy is conditional and discretionary: support\n             <em>may<\/em> be withheld where a fault is traced to a third-party component &mdash; and\n             where it is not attributable, Cisco says it will continue to provide support.<\/p>\n        <\/div>\n        <div class=\"ct-cg__tile\">\n          <div class=\"num\">&#9851;<\/div>\n          <h3>Keep a swap kit<\/h3>\n          <p>Whatever you populate your estate with, keep two or three OEM modules on the shelf. If\n             you raise a case on a port you will be asked to eliminate the optic as a variable.\n             Being able to do that in ten minutes is worth the shelf space.<\/p>\n        <\/div>\n        <div class=\"ct-cg__tile\">\n          <div class=\"num\">&#8734;<\/div>\n          <h3>Lifetime warranty<\/h3>\n          <p>On the module &mdash; not one year, and not tied to your support contract on the\n             switch. Every optic is tested in real hardware before it ships, which is why we can\n             offer it.<\/p>\n        <\/div>\n      <\/div>\n      <div style=\"margin-top:38px;\">\n        <!-- IMG-4 -->\n        <img decoding=\"async\" src=\"https:\/\/optics.carritech.com\/wp-content\/uploads\/2026\/08\/optical-transceivers-2.png\" alt=\"optical-transceivers\"\/>\n      <\/div>\n    <\/div>\n  <\/section>\n  <!-- ======================= CLOSING BAND ======================= -->\n  <section class=\"ct-cg__band\">\n    <div class=\"ct-cg__wrap\">\n      <div class=\"ct-cg__eyebrow\" style=\"justify-content:center;\">Get your copy<\/div>\n      <h2>439 part numbers. One PDF. Free.<\/h2>\n      <p>Name and email, and it is in your inbox &mdash; with the download link on the next page\n         too, so you are not waiting on a mail server. No sales sequence you cannot leave. If the\n         part you need is not in it, tell us and we will either find it or say so plainly.<\/p>\n      <a class=\"ct-cg__btn\" href=\"#ct-cg-card\">Get the guide &rarr;<\/a>\n      <p style=\"margin-top:22px; font-size:15px; color:#9a9a9a;\">\n        Got a whole parts list rather than one part number?\n        <a href=\"\/quote-list-upload\/\" style=\"color:var(--g);\">Send it over<\/a> and we will price it\n        line by line.\n      <\/p>\n    <\/div>\n  <\/section>\n  <!-- sticky CTA, phones only -->\n  <div class=\"ct-cg__sticky\"><a class=\"ct-cg__btn\" href=\"#ct-cg-card\">Get the guide &rarr;<\/a><\/div>\n<\/div>\n<script>\n(function () {\n  var form = document.getElementById('ct-cg-form');\n  var btn  = document.getElementById('ct-cg-submit');\n  var err  = document.getElementById('ct-cg-err');\n  function ga(n, p) { if (typeof window.gtag === 'function') window.gtag('event', n, p || {}); }\n\n  ga('guide_view', { guide: 'cisco-cross-reference-q3-2026' });\n\n  \/* ------------------------------------------------------------------ *\n   * FREE \/ PERSONAL EMAIL DOMAINS\n   * The Zoho form rejects these server-side and bounces the visitor to a\n   * Zoho error page, which loses the lead. 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One PDF you can keep on the desktop and stop googling from. Not everything Cisco has ever made &mdash; nobody&#8217;s [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-101577","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Cisco Optics Reference Guide | Carritech Optics<\/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:\/\/optics.carritech.com\/it\/cisco-optics-reference-guide\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cisco Optics Reference Guide\" \/>\n<meta property=\"og:description\" content=\"Free download &middot; Q3 2026 edition The Cisco optics you actually need, cross-referenced. 439 Cisco and Meraki part numbers matched to their compatible equivalents &mdash; transceivers, direct attach copper, active optical cables and single-fibre BiDi. One PDF you can keep on the desktop and stop googling from. 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