{"id":3584,"date":"2025-11-28T00:00:00","date_gmt":"2025-11-28T00:00:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/pma-physical-medium-attachment-ethernet-explained\/"},"modified":"2026-06-22T04:35:39","modified_gmt":"2026-06-22T04:35:39","slug":"pma-physical-medium-attachment-ethernet-explained","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/pma-physical-medium-attachment-ethernet-explained","title":{"rendered":"Comprendre la couche PMA (Physical Medium Attachment)"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"608\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f069071da15c4bf48583fce260f4b0df-1024x608.webp\" alt=\"Understanding the PMA (Physical Medium Attachment) Layer\" class=\"wp-image-3579\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f069071da15c4bf48583fce260f4b0df-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f069071da15c4bf48583fce260f4b0df-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f069071da15c4bf48583fce260f4b0df-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f069071da15c4bf48583fce260f4b0df-18x12.webp 18w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f069071da15c4bf48583fce260f4b0df.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>et l\u2019attachement au support physique (PMA)<\/strong> est une sous-couche cl\u00e9 au sein de l\u2019Ethernet <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/what-is-phy-physical-layer-basics-explained\/\"><strong>couche physique (PHY)<\/strong><\/a>, op\u00e9rant entre la <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/pcs-physical-coding-sublayer-ethernet-explained\/\"><strong>Sous-couche de codage physique (PCS)<\/strong><\/a> et le <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/what-is-physical-medium-dependent-pmd\/\"><strong>des Moyens Mat\u00e9riels D\u00e9pendants (PMD)<\/strong><\/a> couche. \u00c0 mesure que les d\u00e9bits \u00e9voluent vers 10 G, 25 G, 100 G et plus, le PMA devient essentiel pour permettre la s\u00e9rialisation haute vitesse, le chronom\u00e9trage pr\u00e9cis et une communication stable sur les supports cuivre et optique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans l\u2019architecture Ethernet IEEE 802.3, le PMA constitue le pont qui convertit les blocs structur\u00e9s de la PCS en flux de bits s\u00e9rie haute vitesse adapt\u00e9s \u00e0 la transmission via des transceivers optiques, des voies \u00e9lectriques ou des canaux de plan arri\u00e8re.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f Quelle est la couche PMA dans l\u2019Ethernet ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>PMA<\/strong> ex\u00e9cute les fonctions \u00e9lectriques et critiques du point de vue du chronom\u00e9trage qui permettent aux donn\u00e9es haute vitesse de circuler sur les supports physiques. Elle comprend <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/serdes-interfaces-high-speed-data-transfer-and-signal-integrity\/\"><strong>des circuits SerDes (s\u00e9rialiseur\/d\u00e9s\u00e9rialiseur) <\/strong><\/a><strong>logiques<\/strong>, <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/clock-and-data-recovery-in-modern-communication-systems\/\"><strong>RHC (r\u00e9cup\u00e9ration de l\u2019horloge et des donn\u00e9es)<\/strong><\/a> et des m\u00e9canismes de gestion des voies.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En bref :<br>\ud83d\udc49 <strong>La PCS pr\u00e9pare les donn\u00e9es. Le PMA les s\u00e9rialise. La PMD les transmet dans la fibre ou le cuivre.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le PMA garantit que le signal entrant dans le support est propre, synchronis\u00e9 et coh\u00e9rent sur plusieurs voies haute vitesse.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f Fonctions principales du PMA<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">S\u00e9rialisation et d\u00e9s\u00e9rialisation (SerDes)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019un des r\u00f4les principaux du PMA consiste \u00e0 <strong>convertir les donn\u00e9es parall\u00e8les de la PCS en flux s\u00e9rie haute vitesse<\/strong>, et vice versa.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Chemin d\u2019\u00e9mission (TX) :<\/strong> Parall\u00e8le multi-bit \u2192 flux s\u00e9rie unique<\/p><\/li>\n\n\n\n<li><p><strong>Chemin de r\u00e9ception (RX) :<\/strong> Flux s\u00e9rie \u2192 parall\u00e8le multi-bit<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Cette fonction permet les variantes Ethernet haute vitesse suivantes :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>10GBASE-R (d\u00e9bit ligne de 10,3125 Gb\/s)<\/strong><\/p><\/li>\n\n\n\n<li><p><strong>25GBASE-R (25,78125 Gb\/s)<\/strong><\/p><\/li>\n\n\n\n<li><p><strong>100GBASE-R (4 voies de 25 G)<\/strong><\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Fibre monomode<br> <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/serdes-interfaces-high-speed-data-transfer-and-signal-integrity\/\">SerDes<\/a> influence directement le taux d\u2019erreur binaire et la stabilit\u00e9 de la liaison.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">R\u00e9cup\u00e9ration de l\u2019horloge et synchronisation au niveau bit<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Le PMA int\u00e8gre des fonctionnalit\u00e9s de <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/clock-and-data-recovery-in-modern-communication-systems\/\"><strong>R\u00e9cup\u00e9ration d\u2019horloge et de donn\u00e9es (CDR)<\/strong><\/a> r\u00e9cup\u00e9ration d\u2019horloge (CDR) permettant d\u2019extraire les informations temporelles du flux binaire entrant. La CDR garantit :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Un \u00e9chantillonnage correct de chaque bit<\/p><\/li>\n\n\n\n<li><p>Une compensation de la gigue de la liaison<\/p><\/li>\n\n\n\n<li><p>Une synchronisation stable, m\u00eame sur des canaux longs ou bruyants<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Dans les liaisons optiques modernes, les performances de la CDR constituent un facteur d\u00e9terminant majeur de <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/understanding-what-is-bit-error-rate\/\"><strong>BER<\/strong><\/a>, <strong>, et une op\u00e9ration hors ligne, il introduit des d\u00e9fis d'infrastructure uniques :<\/strong>, and <strong>signal<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"565\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/239b12b64a4b4af38618b96be24bd85b.webp\" alt=\"Clock and Data Recovery (CDR)\" class=\"wp-image-3580\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/239b12b64a4b4af38618b96be24bd85b.webp 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/239b12b64a4b4af38618b96be24bd85b-300x141.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/239b12b64a4b4af38618b96be24bd85b-1024x482.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/239b12b64a4b4af38618b96be24bd85b-768x362.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/239b12b64a4b4af38618b96be24bd85b-18x8.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Brouillage et d\u00e9brouillage<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Le PMA effectue le brouillage afin de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>R\u00e9duire les interf\u00e9rences \u00e9lectromagn\u00e9tiques (EMI)<\/p><\/li>\n\n\n\n<li><p>\u00c9liminer les s\u00e9quences binaires r\u00e9p\u00e9titives longues<\/p><\/li>\n\n\n\n<li><p>Am\u00e9liorer l\u2019al\u00e9atoire pour la r\u00e9cup\u00e9ration d\u2019horloge<\/p><\/li>\n\n\n\n<li><p>Assurer l\u2019\u00e9quilibre en continu (DC balance)<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Le brouillage fonctionne en compl\u00e9ment du codage PCS (par exemple, 64B\/66B) afin de maintenir un profil de transmission robuste.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Multiplexage et d\u00e9multiplexage des voies<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Les interfaces Ethernet multi-voies (40GBASE-R, 100GBASE-R) exigent une gestion stricte des voies :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>R\u00e9partition sur les voies (\u00e9mission)<\/p><\/li>\n\n\n\n<li><p>R\u00e9alignement des voies (r\u00e9ception)<\/p><\/li>\n\n\n\n<li><p>Alignement bas\u00e9 sur des marqueurs (d\u00e9fini par le PCS, mais assist\u00e9 par le PMA)<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Le PMA maintient la synchronisation des syst\u00e8mes parall\u00e8les multi-voies, m\u00eame lorsque chaque voie subit des latences diff\u00e9rentes sur la fibre ou les pistes de circuit imprim\u00e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f PMA vs PCS vs PMD \u2014 Diff\u00e9rences entre couches<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Aper\u00e7u comparatif<\/h3>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 183px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"183\"><p>Couche<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Fonction<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"183\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/pcs-physical-coding-sublayer-ethernet-explained\/\"><strong>PCS<\/strong><\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Codage (64B\/66B), alignement, blocs de contr\u00f4le<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"183\"><p><strong>PMA<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>S\u00e9rialisation, d\u00e9s\u00e9rialisation, r\u00e9cup\u00e9ration d\u2019horloge<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"183\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/what-is-physical-medium-dependent-pmd\/\"><strong>PMD<\/strong><\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Signaux laser\/optiques\/\u00e9lectriques et interface avec le support physique<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Cela peut \u00eatre visualis\u00e9 comme suit :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>MAC \u2192 PCS \u2192 PMA \u2192 PMD \u2192 Support physique<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Chaque couche traite progressivement les donn\u00e9es, en les rapprochant davantage du support physique r\u00e9el.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"608\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/fd912e80cbfc4eda826d7f976493739f-1024x608.webp\" alt=\"MAC \u2192 PCS \u2192 PMA \u2192 PMD \u2192 Medium\" class=\"wp-image-3581\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/fd912e80cbfc4eda826d7f976493739f-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/fd912e80cbfc4eda826d7f976493739f-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/fd912e80cbfc4eda826d7f976493739f-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/fd912e80cbfc4eda826d7f976493739f-18x12.webp 18w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/fd912e80cbfc4eda826d7f976493739f.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f Le PMA dans les normes Ethernet haute vitesse<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 PMA dans le 10GBASE-R<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>SerDes haute performance \u00e0 10,3125 Gb\/s<\/p><\/li>\n\n\n\n<li><p>R\u00e9cup\u00e9ration d\u2019horloge avec compensation de gigue haute fr\u00e9quence (CDR)<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 PMA dans le 25GBASE-R et le 50G PAM4<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>SerDes 25 G par voie<\/p><\/li>\n\n\n\n<li><p>Int\u00e9gration avec la correction d\u2019erreurs avant transmission (FEC) pour la modulation PAM4<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 PMA dans l\u2019Ethernet 40G\/100G<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Architectures \u00e0 4 voies ou \u00e0 10 voies<\/p><\/li>\n\n\n\n<li><p>R\u00e9alignement des voies et synchronisation multicanal d\u00e9terministe<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 PMA dans les syst\u00e8mes PAM4 200G\/400G<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Bien que le PCS assure le codage, le PMA g\u00e8re :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Des voies SerDes \u00e0 26 G ou 53 G<\/p><\/li>\n\n\n\n<li><p>Des exigences strictes en mati\u00e8re de gigue pour la signalisation PAM4<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f Pourquoi la couche PMA est critique dans les transceivers optiques<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Moderne <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\">\u00e9metteurs-r\u00e9cepteurs optiques<\/a> s\u2019appuient fortement sur les fonctionnalit\u00e9s du PMA car :<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Elle d\u00e9termine l\u2019int\u00e9grit\u00e9 du signal<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Les SerDes haute vitesse et la r\u00e9cup\u00e9ration d\u2019horloge (CDR) d\u00e9terminent la propret\u00e9 avec laquelle le signal p\u00e9n\u00e8tre dans le support physique.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Elle r\u00e9duit les taux d\u2019erreur<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">De bonnes performances du PMA r\u00e9duisent le taux d\u2019erreur binaire (BER) avant que <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/fec-forward-error-correction-in-optical-communication\/\">Correction d\u2019erreurs directe (CED)<\/a> ne soit appliqu\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Elle prend en charge les modules fibres multi-voies<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Des modules tels que <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/491483.htm\">QSFP+<\/a>, <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/488452.htm\">QSFP28<\/a>, or <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/473139.htm\">QSFP56<\/a> d\u00e9pendent du multiplexage\/d\u00e9multiplexage des voies assur\u00e9 par le PMA.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong> <\/strong>Elle permet l\u2019interop\u00e9rabilit\u00e9 haute vitesse<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La logique PMA garantit la compatibilit\u00e9 entre commutateurs, routeurs, cartes r\u00e9seau (NIC) et modules optiques.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Transceivers optiques LINK-PP et PHY Ethernet bas\u00e9 sur le PMA<\/h3>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4a29bf0b7ff24fca9f281bdfe1471fd2.webp\" alt=\"LINK-PP Optical Transceivers\" class=\"wp-image-3582\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4a29bf0b7ff24fca9f281bdfe1471fd2.webp 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4a29bf0b7ff24fca9f281bdfe1471fd2-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4a29bf0b7ff24fca9f281bdfe1471fd2-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4a29bf0b7ff24fca9f281bdfe1471fd2-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/4a29bf0b7ff24fca9f281bdfe1471fd2-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">LINK-PP propose un portefeuille complet de <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\">\u00e9metteurs-r\u00e9cepteurs optiques<\/a> con\u00e7us pour fonctionner avec des PHY Ethernet haute vitesse bas\u00e9s sur le PMA et le PCS :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a href=\"https:\/\/www.l-p.com\/store-26192-10g-sfp.htm\" target=\"_blank\" rel=\"\"><strong>SFP+ 10 G<\/strong> \u00e9metteurs-r\u00e9cepteurs<\/a><\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/www.l-p.com\/store-26225-25g-sfp28.htm\" target=\"_blank\" rel=\"\"><strong>SFP28 25 G<\/strong> modules<\/a><\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/www.l-p.com\/store-26153-40g-qsfp.htm\" target=\"_blank\" rel=\"\"><strong>QSFP+ 40 G<\/strong> solutions optiques<\/a><\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\" target=\"_blank\" rel=\"\"><strong>100 G QSFP28<\/strong> \u00e9metteurs-r\u00e9cepteurs<\/a><\/p><\/li>\n\n\n\n<li><p><strong>Modules \u00e0 temp\u00e9rature industrielle pour des environnements s\u00e9v\u00e8res<\/strong><\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ces \u00e9metteurs-r\u00e9cepteurs offrent un faible jitter, une excellente int\u00e9grit\u00e9 du signal et une interop\u00e9rabilit\u00e9 PMA conforme aux normes.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>et l\u2019attachement au support physique (PMA)<\/strong> est une composante fondamentale de la couche physique Ethernet. En g\u00e9rant la s\u00e9rialisation, la r\u00e9cup\u00e9ration d\u2019horloge, le brouillage (scrambling) et la synchronisation des voies (lanes), elle garantit que les donn\u00e9es Ethernet haute vitesse sont transmises de fa\u00e7on propre et fiable sur les supports cuivre et optique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La compr\u00e9hension de la PMA aide les ing\u00e9nieurs \u00e0 concevoir des syst\u00e8mes stables, \u00e0 s\u00e9lectionner des \u00e9metteurs-r\u00e9cepteurs compatibles et \u00e0 maintenir de hautes performances de liaison dans les centres de donn\u00e9es, les r\u00e9seaux de t\u00e9l\u00e9communications et les d\u00e9ploiements Ethernet industriels.<\/p>","protected":false},"excerpt":{"rendered":"<p>Apprenez ce qu\u2019est la PMA (Physical Medium Attachment), comment elle g\u00e8re la s\u00e9rialisation et le r\u00e9cup\u00e9ration de l\u2019horloge, et pourquoi elle est essentielle pour les transceivers optiques modernes \u00e0 haute vitesse.<\/p>","protected":false},"author":1,"featured_media":3583,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[27],"tags":[],"class_list":["post-3584","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/3584","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=3584"}],"version-history":[{"count":5,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/3584\/revisions"}],"predecessor-version":[{"id":10827,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/3584\/revisions\/10827"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/media\/3583"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/media?parent=3584"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/categories?post=3584"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/tags?post=3584"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}