{"id":4769,"date":"2025-10-09T11:12:00","date_gmt":"2025-10-09T11:12:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/ieee-802-3af-poe-standard-explained\/"},"modified":"2026-06-22T06:30:37","modified_gmt":"2026-06-22T06:30:37","slug":"ieee-802-3af-poe-standard-explained","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/ieee-802-3af-poe-standard-explained","title":{"rendered":"Quelle est la norme IEEE 802.3af (PoE) ?"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ffe0f741283441629f7d1da65b6fe9ae.jpg\" alt=\"What is IEEE 802.3af?\" class=\"wp-image-4765\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ffe0f741283441629f7d1da65b6fe9ae.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ffe0f741283441629f7d1da65b6fe9ae-300x178.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ffe0f741283441629f7d1da65b6fe9ae-1024x608.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ffe0f741283441629f7d1da65b6fe9ae-768x456.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ffe0f741283441629f7d1da65b6fe9ae-18x12.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 Introduction : Qu\u2019est-ce que la norme IEEE 802.3af ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>IEEE 802.3af<\/strong>, couramment d\u00e9sign\u00e9e sous le nom de <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/what-you-need-to-know-about-power-over-ethernet\/\"><strong>Alimentation par Ethernet (PoE)<\/strong><\/a>, est la norme internationale initiale qui permet de transmettre de l\u2019\u00e9nergie \u00e9lectrique simultan\u00e9ment aux donn\u00e9es sur des c\u00e2bles Ethernet standard. Ratifi\u00e9e en <strong>2003<\/strong>, cette technologie permet \u00e0 des dispositifs tels que les t\u00e9l\u00e9phones IP, les points d\u2019acc\u00e8s sans fil et les cam\u00e9ras de recevoir \u00e0 la fois de l\u2019alimentation et des donn\u00e9es via un seul c\u00e2ble Cat5 (ou sup\u00e9rieur) \u2014 \u00e9liminant ainsi le besoin d\u2019adaptateurs d\u2019alimentation s\u00e9par\u00e9s.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 Aper\u00e7u technique et sp\u00e9cifications relatives \u00e0 l\u2019alimentation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La norme IEEE 802.3af d\u00e9finit la mani\u00e8re dont l\u2019alimentation est fournie par une <strong>\u00e9quipement source d\u2019alimentation (PSE)<\/strong>, telle qu\u2019un commutateur PoE ou un injecteur, \u00e0 un <strong>dispositif aliment\u00e9 (PD)<\/strong> comme une <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/ip-internet-protocol-cameras-overview\/\">cam\u00e9ra IP<\/a> ou un t\u00e9l\u00e9phone VoIP.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Puissance maximale d\u00e9livr\u00e9e par la source d\u2019alimentation (PSE) :<\/strong> 15,4 W<\/p><\/li><li><p><strong>Puissance disponible au niveau du dispositif consommateur (PD), apr\u00e8s pertes sur le c\u00e2ble :<\/strong> 12,95 W<\/p><\/li><li><p><strong>Tension de fonctionnement :<\/strong> 44\u201357 V CC (nominale : 48 V)<\/p><\/li><li><p><strong>C\u00e2ble pris en charge :<\/strong> Cat5 ou sup\u00e9rieur (utilisant deux des quatre paires torsad\u00e9es)<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019alimentation est transmise via les <strong>paires inutilis\u00e9es (broches 4\u20135 et 7\u20138)<\/strong> or <strong>paires de donn\u00e9es (broches 1\u20132 et 3\u20136),<\/strong> selon la configuration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 Fonctionnalit\u00e9s cl\u00e9s et avantages<\/h2>\n\n\n\n<ol class=\"wp-block-list\" >\n<li><p><strong>Solution \u00e0 c\u00e2ble unique<\/strong> \u2013 R\u00e9duit la complexit\u00e9 et le co\u00fbt d\u2019installation en combinant alimentation et donn\u00e9es dans un seul c\u00e2ble.<\/p><\/li><li><p><strong>Gestion centralis\u00e9e de l\u2019alimentation<\/strong> \u2013 L\u2019alimentation peut \u00eatre contr\u00f4l\u00e9e, surveill\u00e9e et g\u00e9r\u00e9e de fa\u00e7on centralis\u00e9e via le commutateur Ethernet.<\/p><\/li><li><p><strong>D\u00e9tection s\u00e9curis\u00e9e de l\u2019alimentation<\/strong> \u2013 Le syst\u00e8me d\u00e9tecte intelligemment si un dispositif prend en charge PoE avant de lui fournir de l\u2019alimentation, \u00e9vitant ainsi d\u2019endommager les \u00e9quipements non compatibles PoE.<\/p><\/li><li><p><strong>\u00c9volutivit\u00e9 et fiabilit\u00e9<\/strong> \u2013 Simplifie l\u2019extension du r\u00e9seau et garantit des performances constantes dans les environnements professionnels et industriels.<\/p><\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"567\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/b2d73e8911ab405186b7e6731eae38a1.jpg\" alt=\"IEEE 802.3af (PoE)\" class=\"wp-image-4766\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/b2d73e8911ab405186b7e6731eae38a1.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/b2d73e8911ab405186b7e6731eae38a1-300x142.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/b2d73e8911ab405186b7e6731eae38a1-1024x484.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/b2d73e8911ab405186b7e6731eae38a1-768x363.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/b2d73e8911ab405186b7e6731eae38a1-18x9.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 Applications typiques de la norme IEEE 802.3af PoE<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La norme 802.3af convient parfaitement aux <strong>dispositifs \u00e0 faible ou moyenne puissance<\/strong>, for 10\u201340 km fronthaul<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>T\u00e9l\u00e9phones IP<\/strong> \u2013 Communications unifi\u00e9es sans adaptateurs externes.<\/p><\/li><li><p><strong>Points d\u2019acc\u00e8s sans fil (WAP)<\/strong> \u2013 D\u00e9ploiement simplifi\u00e9 dans les plafonds ou les zones \u00e9loign\u00e9es.<\/p><\/li><li><p><strong>Surveillance <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/poe-lan-transformers-in-ip-cameras\/\"><strong>cam\u00e9ras IP<\/strong><\/a> \u2013 Alimentation fiable pour les syst\u00e8mes de s\u00e9curit\u00e9.<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/iot-internet-of-things-definition-and-real-world-examples\/\"><strong>IoT<\/strong><\/a><strong> Passerelles et capteurs<\/strong> \u2013 Installation simplifi\u00e9e dans les syst\u00e8mes de b\u00e2timents intelligents.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">En fournissant pr\u00e8s de 13 W de puissance utilisable, la norme IEEE 802.3af PoE r\u00e9pond aux besoins de la plupart des terminaux r\u00e9seau l\u00e9gers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 PoE vs PoE+ (IEEE 802.3at) : Quelle est la diff\u00e9rence ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">While <strong>IEEE 802.3af<\/strong> fournit jusqu\u2019\u00e0 15,4 W de puissance, tandis que la norme ult\u00e9rieure <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/ieee-802-3at-power-over-ethernet-plus-standard\/\"><strong>IEEE 802.3at<\/strong><\/a><strong> T\u00e9l\u00e9phones IP, WAP de base<\/strong> double cette capacit\u00e9 pour atteindre <strong>30 W<\/strong>, permettant ainsi d\u2019alimenter des dispositifs plus performants tels que les cam\u00e9ras PTZ et les points d\u2019acc\u00e8s Wi-Fi 6 avanc\u00e9s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En pratique :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>PoE (802.3af) :<\/strong> Id\u00e9al pour les dispositifs \u00e0 faible puissance (t\u00e9l\u00e9phones, points d\u2019acc\u00e8s basiques)<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/ieee-802-3at-power-over-ethernet-plus-standard\/\"><strong>PoE+ (802.3at)<\/strong><\/a><strong>:<\/strong> Con\u00e7u pour les dispositifs \u00e0 forte puissance (cam\u00e9ras HD, points d\u2019acc\u00e8s multi-radio)<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Les deux normes sont <strong>r\u00e9trocompatibles<\/strong>, ce qui signifie qu\u2019un commutateur PoE+ peut alimenter en toute s\u00e9curit\u00e9 des dispositifs PoE.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 Solutions LINK-PP PoE pour les r\u00e9seaux IEEE 802.3af<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5171627953c4459cb1c7b580d17ceb09.jpg\" alt=\"LINK-PP PoE Solutions for IEEE 802.3af Networks\" class=\"wp-image-4767\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5171627953c4459cb1c7b580d17ceb09.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5171627953c4459cb1c7b580d17ceb09-300x178.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5171627953c4459cb1c7b580d17ceb09-1024x608.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5171627953c4459cb1c7b580d17ceb09-768x456.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5171627953c4459cb1c7b580d17ceb09-18x12.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Pour assurer une transmission stable de l\u2019alimentation et des donn\u00e9es conform\u00e9ment \u00e0 la norme IEEE 802.3af, des composants magn\u00e9tiques Ethernet de haute qualit\u00e9 sont essentiels. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">, fabricant leader de composants de connectivit\u00e9 r\u00e9seau, propose des solutions magn\u00e9tiques PoE fiables et \u00e9conomiques.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>\ud83d\udd39 <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/481912.htm\"><strong>Prise RJ45 magn\u00e9tique PoE<\/strong><\/a>:<br\/>Con\u00e7ue pour les applications IEEE 802.3af\/at, dot\u00e9e de transformateurs magn\u00e9tiques int\u00e9gr\u00e9s garantissant l\u2019isolation, la suppression des bruits et une alimentation constante de 15,4 W.<\/p><\/li><li><p>\ud83d\udd39 <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/452779.htm\"><strong>Modules transformateurs magn\u00e9tiques PoE<\/strong>:<\/a><br\/>Le transformateur LAN PoE LINK-PP assure une transmission fiable des donn\u00e9es et une fonctionnalit\u00e9 Power over Ethernet (PoE) efficace.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">En utilisant les composants LINK-PP, les fabricants d\u2019\u00e9quipements d\u2019origine (OEM) et les int\u00e9grateurs r\u00e9seau peuvent garantir <strong>une haute fiabilit\u00e9, des performances EMI sup\u00e9rieures et une conformit\u00e9 compl\u00e8te aux normes IEEE<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>IEEE 802.3af (PoE)<\/strong> a r\u00e9volutionn\u00e9 le r\u00e9seau Ethernet en combinant la transmission de l\u2019alimentation et des donn\u00e9es dans une infrastructure unique et efficace. Elle reste la base des technologies PoE modernes, permettant des d\u00e9ploiements r\u00e9seau rentables, flexibles et \u00e9volutifs \u00e0 l\u2019\u00e9chelle mondiale.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour les entreprises et les int\u00e9grateurs recherchant des composants mat\u00e9riels fiables destin\u00e9s aux conceptions compatibles PoE, <strong>les solutions LINK-PP P<\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/478693.htm\"><strong>rises RJ45 magn\u00e9tiques PoE<\/strong><\/a> and <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/439395.htm\"><strong>Transformateurs PoE<\/strong><\/a> offrent des performances robustes, garantissant une alimentation s\u00fbre et efficace pour une large gamme de dispositifs.<\/p>","protected":false},"excerpt":{"rendered":"<p>D\u00e9couvrez ce que signifie IEEE 802.3af (PoE), comment elle fournit jusqu\u2019\u00e0 15,4 W d\u2019alimentation via des c\u00e2bles Ethernet, et ses principales applications. D\u00e9couvrez les magn\u00e9tiques PoE RJ45 LINK-PP pour une alimentation stable.<\/p>","protected":false},"author":1,"featured_media":4768,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[22,23],"class_list":["post-4769","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:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/4769","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/comments?post=4769"}],"version-history":[{"count":4,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/4769\/revisions"}],"predecessor-version":[{"id":11032,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/4769\/revisions\/11032"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/media\/4768"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/media?parent=4769"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/categories?post=4769"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/tags?post=4769"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}