{"id":10581,"date":"2026-05-13T06:18:35","date_gmt":"2026-05-13T06:18:35","guid":{"rendered":"https:\/\/cablefam.com\/?p=10581"},"modified":"2026-08-09T09:26:33","modified_gmt":"2026-08-09T09:26:33","slug":"what-are-lc-upc-and-lc-apc-their-key-differences","status":"publish","type":"post","link":"https:\/\/cablefam.com\/ru\/blog\/guides-tutorials\/what-are-lc-upc-and-lc-apc-their-key-differences.html","title":{"rendered":"\u0427\u0442\u043e \u0442\u0430\u043a\u043e\u0435 LC UPC \u0438 LC APC \u0438 \u0438\u0445 \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0440\u0430\u0437\u043b\u0438\u0447\u0438\u044f?"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Basic Definition<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>LC<\/strong>: Lucent Connector, a small form-factor fiber connector with 1.25mm ceramic ferrule, widely used for SFP\/SFP+ optical modules in high-density ports.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>UPC \/ APC<\/strong> refer to <strong>fiber end-face polishing types<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u041b\u041a UPC<\/strong>Full name: <strong>Ultra Physical Contact<\/strong>End face: <strong>0\u00b0 flat with slight convex dome<\/strong> polishing<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"512\" height=\"384\" src=\"https:\/\/cablefam.com\/wp-content\/uploads\/ad5106017bead9e8d8deafa64f86cc8atplv-a9rns2rl98-pc_smart_face_crop-v1_512_384.webp\" alt=\"\" class=\"wp-image-10582\" title=\"\" srcset=\"https:\/\/cablefam.com\/wp-content\/uploads\/ad5106017bead9e8d8deafa64f86cc8atplv-a9rns2rl98-pc_smart_face_crop-v1_512_384.webp 512w, https:\/\/cablefam.com\/wp-content\/uploads\/ad5106017bead9e8d8deafa64f86cc8atplv-a9rns2rl98-pc_smart_face_crop-v1_512_384-300x225.webp 300w, https:\/\/cablefam.com\/wp-content\/uploads\/ad5106017bead9e8d8deafa64f86cc8atplv-a9rns2rl98-pc_smart_face_crop-v1_512_384-16x12.webp 16w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>LC APC<\/strong>Full name: <strong>Angled Physical Contact<\/strong>End face: <strong>8\u00b0 angled bevel<\/strong> polishing<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"512\" height=\"384\" src=\"https:\/\/cablefam.com\/wp-content\/uploads\/9c358131d1697fe251499f6e4316b123tplv-a9rns2rl98-pc_smart_face_crop-v1_512_384.webp\" alt=\"\" class=\"wp-image-10583\" title=\"\" srcset=\"https:\/\/cablefam.com\/wp-content\/uploads\/9c358131d1697fe251499f6e4316b123tplv-a9rns2rl98-pc_smart_face_crop-v1_512_384.webp 512w, https:\/\/cablefam.com\/wp-content\/uploads\/9c358131d1697fe251499f6e4316b123tplv-a9rns2rl98-pc_smart_face_crop-v1_512_384-300x225.webp 300w, https:\/\/cablefam.com\/wp-content\/uploads\/9c358131d1697fe251499f6e4316b123tplv-a9rns2rl98-pc_smart_face_crop-v1_512_384-16x12.webp 16w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Core Differences<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Item<\/th><th class=\"has-text-align-center\" data-align=\"center\">\u041b\u041a UPC<\/th><th class=\"has-text-align-center\" data-align=\"center\">LC APC<\/th><\/tr><\/thead><tbody><tr><td>End-face Angle<\/td><td>0\u00b0 vertical convex<\/td><td>8\u00b0 angled slope<\/td><\/tr><tr><td>\u0426\u0432\u0435\u0442 \u0434\u043e\u043c\u0430<\/td><td><strong>\u0421\u0438\u043d\u0438\u0439<\/strong><\/td><td><strong>Green<\/strong><\/td><\/tr><tr><td>Return Loss (RL)<\/td><td>\u2265 -50 dB<\/td><td>\u2265 -60 ~ -65 dB<\/td><\/tr><tr><td>Insertion Loss (IL)<\/td><td>0.2 ~ 0.3 dB<\/td><td>Slightly higher ~ 0.3 dB<\/td><\/tr><tr><td>Reflection Feature<\/td><td>Reflected light returns along the original path<\/td><td>Reflected light deflects into cladding and dissipates<\/td><\/tr><tr><td>Application Scenarios<\/td><td>Data center, enterprise network, multi-mode fiber (OM3\/OM4\/OM5), general single-mode short\/medium transmission<\/td><td>CATV, PON\/FTTH, WDM\/DWDM, long-haul transmission, reflection-sensitive optical systems<\/td><\/tr><tr><td>Compatibility<\/td><td>Cannot mate with APC directly<\/td><td>Must connect APC to APC only<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Selection Rules<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Choose LC UPC (Blue)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Data center, switch-to-server connection, ordinary fiber transceivers<\/li>\n\n\n\n<li>OM3\/OM4\/OM5 multimode fiber links<\/li>\n\n\n\n<li>Common single-mode links without WDM or analog video signals<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Choose LC APC (Green)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CATV &amp; IPTV broadcast systems<\/li>\n\n\n\n<li>PON \/ FTTH fiber access networks<\/li>\n\n\n\n<li>WDM\/DWDM long-distance transmission<\/li>\n\n\n\n<li>Systems with strict requirements for low reflection and laser service life<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Important Note<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Do not mix UPC and APC connectors<\/strong>; mismating blue and green connectors will cause severe loss degradation and even damage optical modules. The entire link (patch cord, adapter, device port) must use the same polishing type.<\/p>","protected":false},"excerpt":{"rendered":"<p>Basic Definition LC: Lucent Connector, a small form-factor fiber connector with 1.25mm ceramic ferrule, widely used for SFP\/SFP+ optical modules in high-density ports. UPC \/ APC refer to fiber end-face polishing types: Core Differences Item LC UPC LC APC End-face Angle 0\u00b0 vertical convex 8\u00b0 angled slope Housing Color Blue Green Return Loss (RL) \u2265 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":10584,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[1376,1377,1375,1378],"class_list":["post-10581","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guides-tutorials","tag-lc-apc","tag-lc-apc-fiber","tag-lc-upc","tag-lc-upc-fiber"],"_links":{"self":[{"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/posts\/10581","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/comments?post=10581"}],"version-history":[{"count":1,"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/posts\/10581\/revisions"}],"predecessor-version":[{"id":10587,"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/posts\/10581\/revisions\/10587"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/media\/10584"}],"wp:attachment":[{"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/media?parent=10581"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/categories?post=10581"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cablefam.com\/ru\/wp-json\/wp\/v2\/tags?post=10581"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}