{"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\/pt\/glossary\/pma-physical-medium-attachment-ethernet-explained","title":{"rendered":"Compreendendo a Camada PMA (Anexa\u00e7\u00e3o ao Meio F\u00edsico)"},"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>Physical Medium Attachment (PMA)<\/strong> \u00e9 uma subcamada fundamental dentro do Ethernet <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/what-is-phy-physical-layer-basics-explained\/\"><strong>Camada F\u00edsica (PHY)<\/strong><\/a>, operando entre a <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/pcs-physical-coding-sublayer-ethernet-explained\/\"><strong>Subcamada F\u00edsica de Codifica\u00e7\u00e3o (PCS)<\/strong><\/a> e o <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/what-is-physical-medium-dependent-pmd\/\"><strong>Dependente do Meio F\u00edsico (PMD)<\/strong><\/a> camada. \u00c0 medida que as taxas de dados escalonam para 10G, 25G, 100G e al\u00e9m, a PMA tornou-se essencial para viabilizar a serializa\u00e7\u00e3o em alta velocidade, o controle preciso de temporiza\u00e7\u00e3o e a comunica\u00e7\u00e3o est\u00e1vel sobre meios de cobre e \u00f3pticos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Na arquitetura Ethernet IEEE 802.3, a PMA \u00e9 a ponte que converte blocos estruturados da PCS em fluxos de bits seriais de alta velocidade adequados para transmiss\u00e3o por transceptores \u00f3pticos, vias el\u00e9tricas ou canais de backplane.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f O que \u00e9 a camada PMA no Ethernet?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>PMA<\/strong> executa as fun\u00e7\u00f5es el\u00e9tricas e cr\u00edticas em termos de temporiza\u00e7\u00e3o que permitem que dados em alta velocidade sejam transmitidos atrav\u00e9s de meios f\u00edsicos. Inclui <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/serdes-interfaces-high-speed-data-transfer-and-signal-integrity\/\"><strong>SerDes (Serializador\/Deserializador) <\/strong><\/a><strong>l\u00f3gica<\/strong>, <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/clock-and-data-recovery-in-modern-communication-systems\/\"><strong>CDR (Recupera\u00e7\u00e3o de clock e dados)<\/strong><\/a> circuitos e mecanismos de gerenciamento de vias.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Em resumo:<br>\ud83d\udc49 <strong>A PCS prepara os dados. A PMA os serializa. A PMD os envia para a fibra ou o cobre.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A PMA garante que o sinal que entra no meio seja limpo, sincronizado e consistente em m\u00faltiplas vias de alta velocidade.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f Fun\u00e7\u00f5es principais da PMA<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Serializa\u00e7\u00e3o e deserializa\u00e7\u00e3o (SerDes)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Um dos principais pap\u00e9is da PMA \u00e9 <strong>converter dados paralelos da PCS em fluxos seriais de alta velocidade<\/strong>, e vice-versa.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Caminho de transmiss\u00e3o (TX):<\/strong> Paralelo de m\u00faltiplos bits \u2192 fluxo serial \u00fanico<\/p><\/li>\n\n\n\n<li><p><strong>Caminho de recep\u00e7\u00e3o (RX):<\/strong> Fluxo serial \u2192 paralelo de m\u00faltiplos bits<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Essa fun\u00e7\u00e3o viabiliza variantes Ethernet de alta taxa, tais como:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>10GBASE-R (taxa de linha 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 \u00d7 25G vias)<\/strong><\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A qualidade elevada <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/serdes-interfaces-high-speed-data-transfer-and-signal-integrity\/\">SerDes<br><\/a> impacta diretamente a taxa de erro de bit e a estabilidade do enlace.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Recupera\u00e7\u00e3o de rel\u00f3gio e sincroniza\u00e7\u00e3o em n\u00edvel de bit<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A PMA cont\u00e9m <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/clock-and-data-recovery-in-modern-communication-systems\/\"><strong>Recupera\u00e7\u00e3o de rel\u00f3gio e dados (CDR)<\/strong><\/a> capacidades que extraem informa\u00e7\u00f5es de temporiza\u00e7\u00e3o do fluxo de bits de entrada. O CDR (Clock and Data Recovery) garante:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Amostragem correta de cada bit<\/p><\/li>\n\n\n\n<li><p>Compensa\u00e7\u00e3o da jitter do enlace<\/p><\/li>\n\n\n\n<li><p>Sincroniza\u00e7\u00e3o est\u00e1vel mesmo em canais longos ou ruidosos<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Em enlaces \u00f3pticos modernos, o desempenho do CDR \u00e9 um dos principais determinantes da <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/understanding-what-is-bit-error-rate\/\"><strong>BER<\/strong><\/a>, <strong>lat\u00eancia<\/strong>, and <strong>integridade do sinal<\/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\">Embaralhamento e desembaralhamento<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A PMA realiza o embaralhamento para:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Reduzir interfer\u00eancia eletromagn\u00e9tica (EMI)<\/p><\/li>\n\n\n\n<li><p>Eliminar sequ\u00eancias de bits repetitivas prolongadas<\/p><\/li>\n\n\n\n<li><p>Melhorar a aleatoriedade para a recupera\u00e7\u00e3o de clock<\/p><\/li>\n\n\n\n<li><p>Garantir o equil\u00edbrio CC<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A embaralhamento funciona em conjunto com a codifica\u00e7\u00e3o PCS (por exemplo, 64B\/66B) para manter um perfil robusto de transmiss\u00e3o.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Multiplexa\u00e7\u00e3o e demultiplexa\u00e7\u00e3o de canais<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As interfaces Ethernet de m\u00faltiplos canais (40GBASE-R, 100GBASE-R) exigem uma gest\u00e3o rigorosa de canais:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Distribui\u00e7\u00e3o por canais (TX)<\/p><\/li>\n\n\n\n<li><p>Alinhamento de canais (RX)<\/p><\/li>\n\n\n\n<li><p>Alinhamento baseado em marcadores (definido pela PCS, mas assistido pela PMA)<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A PMA mant\u00e9m sistemas paralelos de m\u00faltiplos canais sincronizados, mesmo quando cada canal experimenta lat\u00eancias diferentes em fibras ou trilhas de PCB.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f PMA vs PCS vs PMD \u2014 Diferen\u00e7as entre camadas<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Vis\u00e3o comparativa<\/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>Layer<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Fun\u00e7\u00e3o<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"183\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/pcs-physical-coding-sublayer-ethernet-explained\/\"><strong>PCS<\/strong><\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Codifica\u00e7\u00e3o (64B\/66B), alinhamento, blocos de controle<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"183\"><p><strong>PMA<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Serializa\u00e7\u00e3o, desserializa\u00e7\u00e3o, recupera\u00e7\u00e3o de clock<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"183\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/what-is-physical-medium-dependent-pmd\/\"><strong>PMD<\/strong><\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Sinaliza\u00e7\u00e3o a laser\/\u00f3ptica\/el\u00e9trica e interface com o meio<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Isso pode ser visualizado como:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>MAC \u2192 PCS \u2192 PMA \u2192 PMD \u2192 Meio<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cada camada processa os dados progressivamente mais pr\u00f3ximos do meio f\u00edsico real.<\/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 PMA nos padr\u00f5es Ethernet de alta velocidade<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 PMA no 10GBASE-R<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>SerDes de alto desempenho a 10,3125 Gb\/s<\/p><\/li>\n\n\n\n<li><p>CDR para toler\u00e2ncia elevada a jitter de alta frequ\u00eancia<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 PMA no 25GBASE-R e 50G PAM4<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>SerDes de 25 G por canal<\/p><\/li>\n\n\n\n<li><p>Integra\u00e7\u00e3o com FEC para modula\u00e7\u00e3o PAM4<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 PMA no Ethernet 40G\/100G<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Arquiteturas de 4 ou 10 canais<\/p><\/li>\n\n\n\n<li><p>Alinhamento de canais e sincroniza\u00e7\u00e3o multicanal determin\u00edstica<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 PMA nos sistemas PAM4 de 200G\/400G<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Embora a PCS lide com a codifica\u00e7\u00e3o, a PMA gerencia:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Canais SerDes de 26 G ou 53 G<\/p><\/li>\n\n\n\n<li><p>Requisitos rigorosos de jitter para sinaliza\u00e7\u00e3o PAM4<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f Por que a camada PMA \u00e9 cr\u00edtica em transceptores \u00f3pticos<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">e \u00f3pticos de qualidade torna-se cr\u00edtica. <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\">transceptores \u00f3pticos<\/a> dependem fortemente da funcionalidade da PMA porque:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ela determina a integridade do sinal<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SerDes de alta velocidade e CDR definem qu\u00e3o limpo o sinal entra no meio.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ela reduz as taxas de erro<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Um bom desempenho da PMA reduz a taxa de erro de bit (BER) antes de <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/pt\/glossary\/fec-forward-error-correction-in-optical-communication\/\">Corre\u00e7\u00e3o de Erro para Frente (FEC)<\/a> ser aplicado.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ela suporta m\u00f3dulos de fibra de m\u00faltiplos canais<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">M\u00f3dulos como <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> dependem da multiplexa\u00e7\u00e3o\/demultiplexa\u00e7\u00e3o de canais pela PMA.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong> <\/strong>Ela permite interoperabilidade de alta velocidade<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A l\u00f3gica da PMA garante compatibilidade entre switches, roteadores, NICs e m\u00f3dulos \u00f3pticos.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Transceptores \u00f3pticos LINK-PP e PHY Ethernet baseado em 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\">A LINK-PP oferece um portf\u00f3lio completo de <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\">transceptores \u00f3pticos<\/a> projetado para operar com PHYs Ethernet de alta velocidade baseados em PMA e 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+ 10G<\/strong> transceptores<\/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 25G<\/strong> m\u00f3dulos<\/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+ 40G<\/strong> solu\u00e7\u00f5es \u00f3pticas<\/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>100G QSFP28<\/strong> transceptores<\/a><\/p><\/li>\n\n\n\n<li><p><strong>m\u00f3dulos para temperaturas industriais destinados a ambientes agressivos<\/strong><\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Esses transceptores oferecem baixa jitter, excelente integridade de sinal e interoperabilidade PMA compat\u00edvel com os padr\u00f5es.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u27a1\ufe0f Conclus\u00e3o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>Physical Medium Attachment (PMA)<\/strong> \u00e9 uma parte fundamental da camada f\u00edsica do Ethernet. Ao gerenciar a serializa\u00e7\u00e3o, recupera\u00e7\u00e3o de clock, embaralhamento (scrambling) e sincroniza\u00e7\u00e3o de lanes, garante que os dados Ethernet de alta velocidade sejam transmitidos de forma limpa e confi\u00e1vel por meio de meios de cobre e \u00f3pticos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Compreender o PMA ajuda os engenheiros a projetar sistemas est\u00e1veis, selecionar transceptores compat\u00edveis e manter alto desempenho de link em centros de dados, redes de telecomunica\u00e7\u00f5es e implanta\u00e7\u00f5es de Ethernet industrial.<\/p>","protected":false},"excerpt":{"rendered":"<p>Saiba o que \u00e9 a PMA (Anexa\u00e7\u00e3o ao Meio F\u00edsico), como ela lida com serializa\u00e7\u00e3o e recupera\u00e7\u00e3o de clock e por que \u00e9 essencial para transceptores \u00f3pticos modernos de alta velocidade.<\/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\/pt\/wp-json\/wp\/v2\/posts\/3584","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resourceslp.szlogic.cn\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/resourceslp.szlogic.cn\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/pt\/wp-json\/wp\/v2\/comments?post=3584"}],"version-history":[{"count":5,"href":"https:\/\/resourceslp.szlogic.cn\/pt\/wp-json\/wp\/v2\/posts\/3584\/revisions"}],"predecessor-version":[{"id":10827,"href":"https:\/\/resourceslp.szlogic.cn\/pt\/wp-json\/wp\/v2\/posts\/3584\/revisions\/10827"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/pt\/wp-json\/wp\/v2\/media\/3583"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/pt\/wp-json\/wp\/v2\/media?parent=3584"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/pt\/wp-json\/wp\/v2\/categories?post=3584"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/pt\/wp-json\/wp\/v2\/tags?post=3584"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}