{"id":4742,"date":"2026-05-13T06:32:27","date_gmt":"2026-05-13T06:32:27","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/key-difference-between-endspan-and-midspan-pse\/"},"modified":"2026-05-25T10:24:25","modified_gmt":"2026-05-25T10:24:25","slug":"key-difference-between-endspan-and-midspan-pse","status":"publish","type":"post","link":"https:\/\/lp.szlogic.cn\/ru\/knowledge-center\/key-difference-between-endspan-and-midspan-pse","title":{"rendered":"Endspan PSE vs. Midspan PSE: Understanding Power Sourcing Equipment for PoE"},"content":{"rendered":"<p class=\"wp-block-paragraph\">In Power over Ethernet (PoE) technology, <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/poe-pse-power-sourcing-equipment-guide\"><strong>Power Sourcing Equipment (PSE)<\/strong><\/a> plays a central role by delivering both data and electrical power over a single Ethernet cable.<br>Depending on where the power is injected into the network, PSE devices fall into two categories: <strong>Endspan PSE<\/strong> and <strong>Midspan PSE<\/strong>.<br>Understanding their differences is essential when designing or deploying efficient PoE networks.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"608\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4344e87800ff4daf9bb8db8f7cdc8ca3-1024x608.webp\" alt=\"Endspan PSE vs. Midspan PSE: Understanding Power Sourcing Equipment for PoE\" class=\"wp-image-4738\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4344e87800ff4daf9bb8db8f7cdc8ca3-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4344e87800ff4daf9bb8db8f7cdc8ca3-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4344e87800ff4daf9bb8db8f7cdc8ca3-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4344e87800ff4daf9bb8db8f7cdc8ca3-18x12.webp 18w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4344e87800ff4daf9bb8db8f7cdc8ca3.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">1. What Is Endspan PSE?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Endspan PSE<\/strong>, often referred to as a <strong>PoE switch<\/strong>, integrates power injection directly into the network switch itself.<br>Each Ethernet port on the switch is capable of delivering both data and DC power to <strong>Powered Devices (PDs)<\/strong> such as IP cameras, <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/what-is-a-wireless-access-point-wap\">wireless access points (WAPs)<\/a>, and VoIP phones.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Characteristics<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Integrated within the switch hardware<\/p><\/li>\n\n\n\n<li><p>Transmits both data and power through the same RJ45 port<\/p><\/li>\n\n\n\n<li><p>No additional PoE injector required<\/p><\/li>\n\n\n\n<li><p>Follows <a href=\"https:\/\/resources.l-p.com\/knowledge-center\/ieee-802-3af-poe-standard-explained\" target=\"_blank\" rel=\"\">IEEE 802.3af<\/a> \/ <a href=\"https:\/\/resources.l-p.com\/knowledge-center\/ieee-802-3at-power-over-ethernet-plus-standard\" target=\"_blank\" rel=\"\">802.3at<\/a> \/ <a href=\"https:\/\/resources.l-p.com\/knowledge-center\/what-is-ieee-802-3-bt-poe-standard\" target=\"_blank\" rel=\"\">802.3bt<\/a> standards<\/p><\/li>\n\n\n\n<li><p>Simplifies wiring and reduces points of failure<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Simplified setup\u2014only one device needed<\/p><\/li>\n\n\n\n<li><p>Lower power loss due to direct integration<\/p><\/li>\n\n\n\n<li><p>Easier centralized management of network power<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><br>An enterprise-grade PoE+ switch that powers 24 IP cameras simultaneously is a typical <strong>Endspan PSE<\/strong> device.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. What Is Midspan PSE?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>Midspan PSE<\/strong>\u2014commonly known as a <strong>PoE Injector<\/strong>\u2014is an external device positioned between a non-PoE switch and the PD.<br>It adds electrical power to the Ethernet cable without affecting the data signal.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Characteristics<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Works with legacy or non-PoE switches<\/p><\/li>\n\n\n\n<li><p>Inserts DC power into Ethernet cables mid-path<\/p><\/li>\n\n\n\n<li><p>Usually available as single-port or multi-port injectors<\/p><\/li>\n\n\n\n<li><p>Compliant with <a href=\"https:\/\/resources.l-p.com\/knowledge-center\/ieee-802-3af-poe-standard-explained\" target=\"_blank\" rel=\"\">IEEE PoE standards<\/a> for safety and compatibility<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Enables PoE support on existing network infrastructure<\/p><\/li>\n\n\n\n<li><p>Cost-effective for upgrading specific ports or small systems<\/p><\/li>\n\n\n\n<li><p>Flexible deployment\u2014no need to replace existing switches<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><br>A single-port PoE injector powering an outdoor wireless AP from a standard Ethernet switch is a <strong>Midspan PSE<\/strong> setup.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Technical Comparison: Endspan vs. Midspan<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"608\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/21fd85a1e7f64513ad47720366a3cc2f-1024x608.webp\" alt=\"Endspan PSE vs. Midspan PSE\" class=\"wp-image-4739\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/21fd85a1e7f64513ad47720366a3cc2f-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/21fd85a1e7f64513ad47720366a3cc2f-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/21fd85a1e7f64513ad47720366a3cc2f-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/21fd85a1e7f64513ad47720366a3cc2f-18x12.webp 18w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/21fd85a1e7f64513ad47720366a3cc2f.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 171px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"171\"><p><strong>Feature<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>Endspan PSE (PoE Switch)<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>Midspan PSE (PoE Injector)<\/strong><\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"171\"><p><strong>Location<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Integrated in the switch<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Between switch and PD<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"171\"><p><strong>Function<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Provides data + power<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Adds power only<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"171\"><p><strong>Installation<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>One device<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Requires extra hardware<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"171\"><p><strong>Use Case<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>New PoE infrastructure<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Upgrading existing networks<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"171\"><p><strong>Efficiency<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Higher<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Slightly lower (additional conversion)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"171\"><p><strong>Typical Devices<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>PoE switches<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>PoE injectors, hubs<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"171\"><p><strong>IEEE Compliance<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>802.3af \/ 802.3at \/ 802.3bt<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>802.3af \/ 802.3at \/ 802.3bt<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Both PSE types serve vital roles.<br><strong>Endspan PSE<\/strong> is ideal for large-scale, centralized PoE networks, while <strong>Midspan PSE<\/strong> offers flexibility and retrofit compatibility in mixed environments.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Power Delivery and Safety Mechanisms<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Regardless of type, both Endspan and Midspan PSE devices follow the same PoE power negotiation process defined by IEEE standards:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><p><strong>Detection:<\/strong> Identify whether a connected device supports PoE.<\/p><\/li>\n\n\n\n<li><p><strong>Classification:<\/strong> Determine the PD\u2019s required power level (Class 0\u20138).<\/p><\/li>\n\n\n\n<li><p><strong>Power Application:<\/strong> Deliver DC power using Mode A (data pairs) or Mode B (spare pairs).<\/p><\/li>\n\n\n\n<li><p><strong>Monitoring:<\/strong> Maintain voltage and current stability during operation.<\/p><\/li>\n\n\n\n<li><p><strong>Shutdown:<\/strong> Automatically cut power when faults or disconnections occur.<\/p><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">This ensures that <strong>non-PoE devices are never damaged<\/strong>, and all PDs receive stable, compliant power.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. Practical Applications<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Endspan PSE:<\/strong><\/p>\n<ul class=\"wp-block-list\">\n<li><p>Data centers and enterprise networks<\/p><\/li>\n\n\n\n<li><p>Security surveillance systems<\/p><\/li>\n\n\n\n<li><p>Smart building automation<\/p><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><p><strong>Midspan PSE:<\/strong><\/p>\n<ul class=\"wp-block-list\">\n<li><p>Upgrading legacy switches to support PoE devices<\/p><\/li>\n\n\n\n<li><p>Remote or temporary installations<\/p><\/li>\n\n\n\n<li><p>Industrial <a href=\"https:\/\/resources.l-p.com\/knowledge-center\/iot-internet-of-things-definition-and-real-world-examples\" target=\"_blank\" rel=\"\">IoT<\/a> setups where power sources are limited<\/p><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">6. LINK-PP Solutions for PSE Equipment<\/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\/9091348da3eb4667953413124f34d4c0.webp\" alt=\"LINK-PP PSE Solutions\" class=\"wp-image-4740\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9091348da3eb4667953413124f34d4c0.webp 1200w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9091348da3eb4667953413124f34d4c0-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9091348da3eb4667953413124f34d4c0-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9091348da3eb4667953413124f34d4c0-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9091348da3eb4667953413124f34d4c0-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">LINK-PP provides a full range of <strong>PoE-ready magnetic RJ45 connectors<\/strong> and <strong>Ethernet transformers<\/strong> designed for both Endspan and Midspan PSE implementations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a href=\"https:\/\/www.l-p.com\/products\/473888.htm\" target=\"_blank\" rel=\"\"><strong>LPJ0123GDNL<\/strong><\/a> \u2014 A compact <strong>PoE+ RJ45 connector<\/strong> supporting <strong>IEEE 802.3at (PoE+)<\/strong>, ideal for PoE switches (Endspan PSE). <\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/www.l-p.com\/products\/452769.htm\" target=\"_blank\" rel=\"\"><strong>LP41223NL<\/strong> <\/a>\u2014 A <strong>10\/100Base-T PoE+ LAN transformer<\/strong> that ensures high isolation and efficient power delivery for injectors (Midspan PSE).<\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/www.l-p.com\/products\/470326.htm\" target=\"_blank\" rel=\"\"><strong>LPJK6071AONL<\/strong><\/a> \u2014 A <strong>Gigabit magnetic module<\/strong> for 1000Base-T applications with PoE++ support, suitable for industrial-grade PSE designs. <\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These components are engineered for <strong>signal integrity<\/strong>, <strong>thermal stability<\/strong>, and <strong>long-term reliability<\/strong>, ensuring optimal performance in both PoE switches and injectors.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7. Choosing the Right PSE Type<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When deciding between <strong>Endspan<\/strong> and <strong>Midspan<\/strong> PSE, consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Network scale:<\/strong> For large or new installations, choose Endspan.<\/p><\/li>\n\n\n\n<li><p><strong>Legacy integration:<\/strong> For existing non-PoE switches, Midspan is cost-effective.<\/p><\/li>\n\n\n\n<li><p><strong>Power requirements:<\/strong> High-power devices (e.g., 802.3bt Type 4) may require advanced PSE modules.<\/p><\/li>\n\n\n\n<li><p><strong>Environmental conditions:<\/strong> Select PoE connectors and transformers with industrial temperature ratings for rugged environments.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">8. Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Both <strong>Endspan PSE<\/strong> and <strong>Midspan PSE<\/strong> are essential components in modern PoE infrastructure.<br>While Endspan integrates power and data delivery in one device, Midspan provides flexibility for upgrading non-PoE networks without full hardware replacement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For OEMs and network engineers, choosing reliable PoE-certified components is critical. Explore LINK-PP\u2019s portfolio of <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-17492-integrated-rj45-connector.htm\"><strong>PoE RJ45 connectors<\/strong><\/a> and <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-17548-lan-transformer.htm\"><strong>LAN transformers<\/strong><\/a> to build efficient, high-performance PSE solutions at <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\"><strong>l-p.com<\/strong><\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Learn the difference between Endspan and Midspan PSE in PoE networks, their roles, advantages, and how LINK-PP PoE RJ45 connectors support both types.<\/p>","protected":false},"author":1,"featured_media":4741,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[22,23],"class_list":["post-4742","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\/4742","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=4742"}],"version-history":[{"count":2,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4742\/revisions"}],"predecessor-version":[{"id":7753,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4742\/revisions\/7753"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media\/4741"}],"wp:attachment":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media?parent=4742"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/categories?post=4742"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/tags?post=4742"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}