{"id":4783,"date":"2026-05-13T07:06:25","date_gmt":"2026-05-13T07:06:25","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/ieee-802-3at-power-over-ethernet-plus-standard\/"},"modified":"2026-05-25T10:19:51","modified_gmt":"2026-05-25T10:19:51","slug":"ieee-802-3at-power-over-ethernet-plus-standard","status":"publish","type":"post","link":"https:\/\/lp.szlogic.cn\/ru\/knowledge-center\/ieee-802-3at-power-over-ethernet-plus-standard","title":{"rendered":"IEEE 802.3at (PoE+) Standard Explained: Power, Applications &#038; Benefits"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8cacf2fc454c422c8e974065ed88f18e.webp\" alt=\"What is IEEE 802.3at (PoE+)?\" class=\"wp-image-4780\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8cacf2fc454c422c8e974065ed88f18e.webp 1200w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8cacf2fc454c422c8e974065ed88f18e-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8cacf2fc454c422c8e974065ed88f18e-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8cacf2fc454c422c8e974065ed88f18e-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8cacf2fc454c422c8e974065ed88f18e-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x27a1;&#xfe0f; Introduction: What is IEEE 802.3at (PoE+)?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>IEEE 802.3at standard<\/strong>, widely known as <strong>PoE+<\/strong>, is the second generation of <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/what-you-need-to-know-about-power-over-ethernet\">Power over Ethernet (PoE)<\/a> technology. Ratified in 2009, it builds upon the original <strong>IEEE 802.3af PoE standard<\/strong>, nearly doubling the available power. With PoE+, a single Ethernet cable can deliver both <strong>high-speed data and up to 30 watts of electrical power<\/strong>, enabling the deployment of more power-hungry network devices without additional power supplies or adapters.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x27a1;&#xfe0f; Power Delivery: From PoE to PoE+<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The primary advantage of IEEE 802.3at lies in its enhanced power capacity:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>IEEE 802.3af (PoE):<\/strong><\/p><ul><li><p>Maximum power at PSE (Power Sourcing Equipment): <strong>15.4 W<\/strong><\/p><\/li><li><p>Available power at PD (Powered Device): <strong>12.95 W<\/strong><\/p><\/li><\/ul><\/li><li><p><strong>IEEE 802.3at (PoE+):<\/strong><\/p><ul><li><p>Maximum power at PSE: <strong>30 W<\/strong><\/p><\/li><li><p>Available power at PD: <strong>25.5 W<\/strong><\/p><\/li><\/ul><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This significant increase makes PoE+ suitable for next-generation IP-based equipment that demands higher wattage. Importantly, 802.3at remains <strong>backward compatible<\/strong> with 802.3af, ensuring seamless integration into existing infrastructures.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x27a1;&#xfe0f; Key Applications of IEEE 802.3at (PoE+)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">PoE+ extends the range of powered devices beyond what standard PoE could support. Common applications include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/poe-lan-transformers-in-ip-cameras\"><strong>IP Cameras<\/strong><\/a><strong> with PTZ (Pan-Tilt-Zoom) &amp; IR illumination<\/strong><\/p><\/li><li><p><strong>High-performance Wireless Access Points (Wi-Fi 5\/6\/6E)<\/strong><\/p><\/li><li><p><strong>VoIP Phones with color displays and advanced features<\/strong><\/p><\/li><li><p><strong>Thin Clients and Small <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/what-is-a-network-switch\"><strong>Network Switches<\/strong><\/a><\/p><\/li><li><p><strong>Industrial and IoT Devices<\/strong> requiring reliable mid-level power<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">By consolidating power and data into one cable, PoE+ simplifies deployment, reduces cabling costs, and improves scalability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x27a1;&#xfe0f; Technical Features of IEEE 802.3at<\/h2>\n\n\n\n<ol class=\"wp-block-list\" >\n<li><p><strong>Backward Compatibility:<\/strong> Supports both PoE (802.3af) and PoE+ (802.3at) devices.<\/p><\/li><li><p><strong>Intelligent Power Detection:<\/strong> PSE automatically identifies if a connected device supports PoE before supplying power, protecting non-PoE devices.<\/p><\/li><li><p><strong>Flexible Cabling:<\/strong> Operates over Cat5e or higher Ethernet cables.<\/p><\/li><li><p><strong>Midspan or Endspan Deployment:<\/strong> PoE+ can be integrated into switches (endspan) or via midspan injectors.<\/p><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x27a1;&#xfe0f; IEEE 802.3at vs IEEE 802.3bt (PoE++)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">While 802.3at delivers up to <strong>30W<\/strong>, the newer <strong>IEEE 802.3bt (PoE++)<\/strong> standard pushes the limits further, supplying up to <strong>60W (Type 3)<\/strong> or <strong>100W (Type 4)<\/strong>. This makes PoE++ ideal for high-power devices such as pan-tilt-zoom cameras with heaters, multi-radio wireless APs, or even laptops.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For network engineers and integrators, understanding the differences between PoE+ and PoE++ ensures selecting the right infrastructure components for scalability and performance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x27a1;&#xfe0f; LINK-PP Solutions for PoE+<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/183580f84621465fad9ab762573857a3.webp\" alt=\"LINK-PP Solutions for PoE+\" class=\"wp-image-4781\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/183580f84621465fad9ab762573857a3.webp 1200w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/183580f84621465fad9ab762573857a3-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/183580f84621465fad9ab762573857a3-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/183580f84621465fad9ab762573857a3-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/183580f84621465fad9ab762573857a3-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">To fully leverage IEEE 802.3at and IEEE 802.3bt standards, high-quality Ethernet magnetics are essential for stable data transmission and efficient power delivery. <strong>LINK-PP<\/strong>, a leading supplier of magnetics for Ethernet connectivity, provides robust solutions tailored for PoE networks:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>&#x1f539; <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/466212.htm\"><strong>PoE+ RJ45 Magnetics Jack<\/strong><\/a>: Designed for IEEE 802.3at compliance, supporting up to 30W power delivery with excellent EMI performance.<\/p><\/li><li><p>&#x1f539; <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/452775.htm\"><strong>PoE+ Magnetics Transformer Modules<\/strong><\/a>: LP41223NL 10\/100 Base-T Single Port Transformer Modules Engineered For IEEE 802.3at PoE+ Application.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These components ensure <strong>safe, efficient, and high-performance PoE deployment<\/strong> across enterprise, industrial, and IoT environments.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>IEEE 802.3at (PoE+) standard<\/strong> has become a cornerstone of modern networking, enabling cost-effective and scalable deployment of power-hungry devices through a single Ethernet connection. With higher power capacity, backward compatibility, and wide application potential, PoE+ bridges the gap between traditional PoE and the next-generation PoE++ standard.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For organizations building <strong>future-ready networks<\/strong>, choosing reliable PoE magnetics is critical. <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/buy-poe+.htm\"><strong>LINK-PP\u2019s PoE+ solutions<\/strong> <\/a>provide the performance, safety, and scalability required for enterprise and industrial applications.<\/p>","protected":false},"excerpt":{"rendered":"<p>Discover the IEEE 802.3at (PoE+) standard, its 30W power delivery, key applications, and benefits. Learn how LINK-PP PoE+ RJ45 Magnetics support modern networks.<\/p>","protected":false},"author":1,"featured_media":4782,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[22,23],"class_list":["post-4783","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge-center","tag-integrated-rj45-connectors","tag-link-pp-lan-transformers"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4783","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/comments?post=4783"}],"version-history":[{"count":2,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4783\/revisions"}],"predecessor-version":[{"id":7742,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4783\/revisions\/7742"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media\/4782"}],"wp:attachment":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media?parent=4783"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/categories?post=4783"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/tags?post=4783"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}