{"id":4279,"date":"2025-09-26T11:12:00","date_gmt":"2025-09-26T11:12:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/ethernet-common-mode-choke-cmc-guide\/"},"modified":"2026-06-22T06:41:26","modified_gmt":"2026-06-22T06:41:26","slug":"ethernet-common-mode-choke-cmc-guide","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/ethernet-common-mode-choke-cmc-guide","title":{"rendered":"CMC (B\u1ed9 l\u1ecdc ch\u1ebf \u0111\u1ed9 chung): Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a CMC trong m\u1ea1ng Ethernet"},"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\/ed9be523cb3c46d2824cd84209845e94.webp\" alt=\"CMC (Common-Mode Choke)\" class=\"wp-image-4275\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed9be523cb3c46d2824cd84209845e94.webp 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed9be523cb3c46d2824cd84209845e94-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed9be523cb3c46d2824cd84209845e94-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed9be523cb3c46d2824cd84209845e94-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed9be523cb3c46d2824cd84209845e94-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39<\/strong> B\u1ed9 l\u1ecdc chung (CMC) l\u00e0 g\u00ec?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>cu\u1ed9n ch\u1ed1ng nhi\u1ec5u ch\u1ebf \u0111\u1ed9 chung (CMC)<\/strong> l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n t\u1eeb t\u00ednh th\u1ee5 \u0111\u1ed9ng g\u1ed3m hai (ho\u1eb7c nhi\u1ec1u h\u01a1n) cu\u1ed9n d\u00e2y qu\u1ea5n tr\u00ean m\u1ed9t l\u00f5i chung. N\u00f3 t\u1ea1o ra <strong>tr\u1edf kh\u00e1ng cao \u0111\u1ed1i v\u1edbi d\u00f2ng \u0111i\u1ec7n ch\u1ebf \u0111\u1ed9 chung (nhi\u1ec5u xu\u1ea5t hi\u1ec7n \u0111\u1ed3ng \u0111\u1ec1u tr\u00ean c\u1ea3 hai \u0111\u01b0\u1eddng d\u00e2y)<\/strong> trong khi t\u1ea1o ra <strong>tr\u1edf kh\u00e1ng th\u1ea5p \u0111\u1ed1i v\u1edbi t\u00edn hi\u1ec7u vi sai (t\u00edn hi\u1ec7u mong mu\u1ed1n)<\/strong>. Do \u0111\u00f3, d\u1eef li\u1ec7u mong mu\u1ed1n \u0111i qua v\u1edbi m\u1ee9c suy hao t\u1ed1i thi\u1ec3u, trong khi nhi\u1ec5u ch\u1ebf \u0111\u1ed9 chung kh\u00f4ng mong mu\u1ed1n b\u1ecb \u1ee9c ch\u1ebf.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39<\/strong> Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ed9 l\u1ecdc chung (CMC)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u1ee7y v\u00e0 c\u1ed9ng t\u1eeb t\u00ednh:<\/strong> c\u00e1c d\u00f2ng vi sai ch\u1ea1y theo chi\u1ec1u ng\u01b0\u1ee3c nhau trong c\u00e1c cu\u1ed9n d\u00e2y gh\u00e9p \u0111\u00f4i; t\u1eeb tr\u01b0\u1eddng c\u1ee7a ch\u00fang tri\u1ec7t ti\u00eau l\u1eabn nhau trong l\u00f5i, n\u00ean b\u1ed9 l\u1ecdc tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t cu\u1ed9n c\u1ea3m g\u1ea7n b\u1eb1ng kh\u00f4ng \u0111\u1ed1i v\u1edbi t\u00edn hi\u1ec7u vi sai. \u0110\u1ed1i v\u1edbi d\u00f2ng ch\u1ebf \u0111\u1ed9 chung, c\u00e1c t\u1eeb tr\u01b0\u1eddng c\u1ed9ng l\u1ea1i, t\u1ea1o ra \u0111\u1ed9 t\u1ef1 c\u1ea3m l\u00e0m ch\u1eb7n ho\u1eb7c suy gi\u1ea3m nhi\u1ec5u kh\u00f4ng mong mu\u1ed1n. Ch\u00ednh h\u00e0nh vi ch\u1ecdn l\u1ecdc n\u00e0y khi\u1ebfn c\u00e1c b\u1ed9 l\u1ecdc chung (CMC) tr\u1edf n\u00ean l\u00fd t\u01b0\u1edfng cho c\u00e1c \u0111\u01b0\u1eddng truy\u1ec1n c\u00e2n b\u1eb1ng t\u1ed1c \u0111\u1ed9 cao nh\u01b0 Ethernet.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Vi sai so v\u1edbi ch\u1ebf \u0111\u1ed9 chung <\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Vi sai (t\u00edn hi\u1ec7u h\u1eefu \u00edch): \u0111i qua v\u1edbi t\u1ed5n th\u1ea5t r\u1ea5t nh\u1ecf.<\/p><\/li>\n\n\n\n<li><p>Ch\u1ebf \u0111\u1ed9 chung (nhi\u1ec5u): g\u1eb7p tr\u1edf kh\u00e1ng cao \u2192 b\u1ecb suy gi\u1ea3m ho\u1eb7c ph\u1ea3n x\u1ea1.<\/p><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"590\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3f47e3ce16fa488c810675f9a7751b3b-1024x590.webp\" alt=\"Differential vs common-mode \" class=\"wp-image-4276\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3f47e3ce16fa488c810675f9a7751b3b-1024x590.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3f47e3ce16fa488c810675f9a7751b3b-300x173.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3f47e3ce16fa488c810675f9a7751b3b-768x442.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3f47e3ce16fa488c810675f9a7751b3b-18x10.webp 18w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3f47e3ce16fa488c810675f9a7751b3b.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39<\/strong> V\u00ec sao b\u1ed9 l\u1ecdc chung (CMC) quan tr\u1ecdng trong Ethernet<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/emc-ems-emi-electromagnetic-compatibility-susceptibility-interference\/\" target=\"_blank\" rel=\"\"><strong>Tu\u00e2n th\u1ee7 EMI\/EMC<\/strong><\/a><strong>: C\u00e1c b\u1ed9 l\u1ecdc chung (CMC) gi\u1ea3m ph\u00e1t x\u1ea1 do c\u00e1p g\u00e2y ra v\u00e0 n\u00e2ng cao kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m v\u1edbi c\u00e1c ngu\u1ed3n nhi\u1ec5u b\u00ean ngo\u00e0i, gi\u00fap thi\u1ebft b\u1ecb <\/strong>v\u01b0\u1ee3t qua c\u00e1c b\u00e0i ki\u1ec3m tra quy \u0111\u1ecbnh.<\/p><\/li>\n\n\n\n<li><p><strong>\u0110\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u:<\/strong> C\u00e1c b\u1ed9 l\u1ecdc chung (CMC) \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn \u0111\u00fang c\u00e1ch s\u1ebd duy tr\u00ec \u0111\u1eb7c t\u00ednh vi sai <a href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/insertion-loss-impact-on-rj45-magjack\/\" target=\"_blank\" rel=\"\">t\u1ed5n hao ch\u00e8n<\/a> v\u00e0 b\u1ea3o to\u00e0n bi\u1ec3u \u0111\u1ed3 m\u1eaft (eye diagram) tr\u00ean to\u00e0n d\u1ea3i t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u m\u1ee5c ti\u00eau (10\/100\/1000\/2,5G\/5G, v.v.)<\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-you-need-to-know-about-power-over-ethernet\/\" target=\"_blank\" rel=\"\"><strong>PoE<\/strong><\/a><strong> c\u00e1c y\u1ebfu t\u1ed1 c\u1ea7n c\u00e2n nh\u1eafc:<\/strong> D\u00f2ng m\u1ed9t chi\u1ec1u (DC) t\u1eeb PoE l\u00e0m l\u1ec7ch \u0111i\u1ec3m l\u00e0m vi\u1ec7c c\u1ee7a l\u00f5i b\u1ed9 l\u1ecdc; c\u00e1c k\u1ef9 s\u01b0 thi\u1ebft k\u1ebf ph\u1ea3i ch\u1ecdn l\u00f5i v\u00e0 cu\u1ed9n d\u00e2y c\u00f3 d\u1ef1 tr\u1eef b\u00e3o h\u00f2a \u0111\u1ee7 l\u1edbn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ed9 l\u1ecdc chung (CMC) v\u1eabn \u0111\u01b0\u1ee3c duy tr\u00ec d\u01b0\u1edbi t\u1ea3i PoE. <\/p><\/li>\n\n\n\n<li><p><strong>T\u00edch h\u1ee3p v\u1edbi bi\u1ebfn \u00e1p LAN:<\/strong> Nhi\u1ec1u <a href=\"https:\/\/www.l-p.com\/store-17492-integrated-rj45-connector.htm\" target=\"_blank\" rel=\"\">\u0110\u1ea7u n\u1ed1i RJ45 t\u00edch h\u1ee3p bi\u1ebfn \u00e1p t\u1eeb t\u00ednh (RJ45 Magnetic Jacks)<\/a> t\u00edch h\u1ee3p ch\u1ee9c n\u0103ng b\u1ed9 l\u1ecdc chung (CMC) ho\u1eb7c k\u1ebft h\u1ee3p m\u1ed9t b\u1ed9 l\u1ecdc chung (CMC) chuy\u00ean d\u1ee5ng v\u1edbi bi\u1ebfn \u00e1p c\u00e1ch ly nh\u1eb1m \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u v\u1ec1 EMC v\u00e0 c\u00e1ch ly \u1edf c\u1ea5p c\u1ed5ng. <\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39<\/strong> C\u00e1c th\u00f4ng s\u1ed1 ch\u00ednh c\u1ea7n \u0111\u00e1nh gi\u00e1 khi l\u1ef1a ch\u1ecdn b\u1ed9 l\u1ecdc chung (CMC)<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><p><strong>Tr\u1edf kh\u00e1ng theo t\u1ea7n s\u1ed1 (tr\u1edf kh\u00e1ng ch\u1ebf \u0111\u1ed9 chung):<\/strong> cho bi\u1ebft m\u1ee9c \u0111\u1ed9 hi\u1ec7u qu\u1ea3 m\u00e0 b\u1ed9 l\u1ecdc suy gi\u1ea3m nhi\u1ec5u tr\u00ean d\u1ea3i t\u1ea7n s\u1ed1 g\u00e2y v\u1ea5n \u0111\u1ec1. <\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/insertion-loss-impact-on-rj45-magjack\/\" target=\"_blank\" rel=\"\"><strong>T\u1ed5n hao ch\u00e8n<\/strong><\/a><strong> \/ tr\u1edf kh\u00e1ng vi sai:<\/strong> ph\u1ea3i nh\u1ecf trong d\u1ea3i t\u1ea7n s\u1ed1 Ethernet \u0111\u1ec3 tr\u00e1nh l\u00e0m suy gi\u1ea3m t\u00edn hi\u1ec7u d\u1eef li\u1ec7u. <\/p><\/li>\n\n\n\n<li><p><strong>\u0110\u1ecbnh m\u1ee9c d\u00f2ng m\u1ed9t chi\u1ec1u (DC) v\u00e0 d\u00f2ng b\u00e3o h\u00f2a:<\/strong> \u0111\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng PoE v\u00e0 \u0111\u01b0\u1eddng truy\u1ec1n d\u00e0i, h\u00e3y ch\u1ecdn b\u1ed9 l\u1ecdc c\u00f3 l\u00f5i kh\u00f4ng b\u1ecb b\u00e3o h\u00f2a d\u01b0\u1edbi m\u1ee9c d\u00f2ng DC d\u1ef1 ki\u1ebfn. <\/p><\/li>\n\n\n\n<li><p><strong>\u0110i\u1ec7n tr\u1edf m\u1ed9t chi\u1ec1u (DCR):<\/strong> DCR th\u1ea5p gi\u00fap gi\u1ea3m s\u1ee5t \u00e1p v\u00e0 t\u1ed5n th\u1ea5t c\u00f4ng su\u1ea5t, \u0111i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng trong c\u00e1c \u1ee9ng d\u1ee5ng truy\u1ec1n t\u1ea3i \u0111i\u1ec7n n\u0103ng. <\/p><\/li>\n\n\n\n<li><p><strong>G\u00f3i s\u1ea3n ph\u1ea9m &amp; ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t (SMD so v\u1edbi <\/strong><a href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-tht-through-hole-technology\/\" target=\"_blank\" rel=\"\"><strong>xuy\u00ean l\u1ed7 (through-hole)<\/strong><\/a><strong>), x\u1ebfp h\u1ea1ng nhi\u1ec7t v\u00e0 ch\u1ee9ng nh\u1eadn d\u00e0nh cho \u00f4 t\u00f4 (v\u00ed d\u1ee5: AEC-Q):<\/strong> l\u1ef1a ch\u1ecdn d\u1ef1a tr\u00ean m\u00f4i tr\u01b0\u1eddng s\u1eed d\u1ee5ng v\u00e0 y\u00eau c\u1ea7u v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng s\u1ea3n xu\u1ea5t.<\/p><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39<\/strong> M\u1ed9t s\u1ed1 m\u1eb9o th\u1ef1c t\u1ebf khi thi\u1ebft k\u1ebf v\u00e0 b\u1ed1 tr\u00ed m\u1ea1ch<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>\u0110\u1eb7t c\u00e1c th\u00e0nh ph\u1ea7n t\u1eeb t\u00ednh g\u1ea7n v\u1ecb tr\u00ed c\u00e1p RJ45 v\u00e0o m\u1ea1ch:<\/strong> gi\u00fap gi\u1ea3m di\u1ec7n t\u00edch v\u00f2ng l\u1eb7p v\u00e0 gi\u1ea3m b\u1ee9c x\u1ea1 \u1edf c\u1ea5p b\u1ea3ng m\u1ea1ch. <\/p><\/li>\n\n\n\n<li><p><strong>Tu\u00e2n theo <\/strong><a href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-phy-physical-layer-basics-explained\/\" target=\"_blank\" rel=\"\"><strong>PHY<\/strong><\/a><strong> h\u01b0\u1edbng d\u1eabn c\u1ee7a nh\u00e0 cung c\u1ea5p:<\/strong> m\u1ed9t s\u1ed1 PHY ho\u1eb7c thi\u1ebft k\u1ebf tham kh\u1ea3o quy \u0111\u1ecbnh v\u1ecb tr\u00ed \u0111\u1eb7t b\u1ed9 l\u1ecdc (ph\u00eda thi\u1ebft b\u1ecb hay ph\u00eda c\u00e1p) v\u00e0 c\u1ea5u tr\u00fac t\u1eeb t\u00ednh \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb. H\u00e3y ki\u1ec3m tra c\u00e1c ghi ch\u00fa \u1ee9ng d\u1ee5ng c\u1ee7a PHY khi c\u00f3 s\u1eb5n. <\/p><\/li>\n\n\n\n<li><p><strong>C\u00e2n b\u1eb1ng gi\u1eefa l\u1ecdc v\u00e0 <\/strong><a href=\"https:\/\/resourceslp.szlogic.cn\/vi\/what-is-data-bandwidth\/\" target=\"_blank\" rel=\"\"><strong>b\u0103ng th\u00f4ng<br><\/strong><\/a><strong>:<\/strong> \u0111\u1ed9 t\u1ef1 c\u1ea3m ch\u1ebf \u0111\u1ed9 chung qu\u00e1 l\u1edbn ho\u1eb7c \u0111i\u1ec7n dung th\u00eam v\u00e0o c\u00f3 th\u1ec3 d\u1ecbch chuy\u1ec3n t\u1ea7n s\u1ed1 c\u1eaft c\u1ee7a b\u1ed9 l\u1ecdc v\u00e0 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00edn hi\u1ec7u t\u1ed1c \u0111\u1ed9 cao; h\u00e3y s\u1eed d\u1ee5ng c\u00e1c h\u01b0\u1edbng d\u1eabn thi\u1ebft k\u1ebf b\u1ed9 l\u1ecdc c\u1ee7a nh\u00e0 cung c\u1ea5p v\u00e0 th\u1eed nghi\u1ec7m c\u00e1c m\u1eabu nguy\u00ean m\u1eabu.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39<\/strong> K\u1ebft lu\u1eadn<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>B\u1ed9 l\u1ecdc chung (CMC)<\/strong> l\u00e0 m\u1ed9t b\u1ed9 l\u1ecdc EMI ch\u00ednh x\u00e1c nh\u1eb1m \u1ee9c ch\u1ebf nhi\u1ec5u ch\u1ebf \u0111\u1ed9 chung kh\u00f4ng mong mu\u1ed1n trong khi cho ph\u00e9p t\u00edn hi\u1ec7u vi sai \u0111i qua \u2014 khi\u1ebfn n\u00f3 tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 thi\u1ebfu trong c\u00e1c th\u00e0nh ph\u1ea7n t\u1eeb t\u00ednh Ethernet v\u00e0 <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/network-filter-lan-filter-guide\/\">b\u1ed9 l\u1ecdc LAN<\/a>. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t Ethernet v\u00e0 PoE \u0111\u00e1ng tin c\u1eady, c\u00e1c b\u1ed9 l\u1ecdc chung (CMC) c\u1ea7n \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi c\u00e1c th\u00f4ng s\u1ed1 then ch\u1ed1t nh\u01b0 tr\u1edf kh\u00e1ng, t\u1ed5n hao ch\u00e8n (insertion loss) v\u00e0 d\u00f2ng b\u00e3o h\u00f2a m\u1ed9t chi\u1ec1u (DC saturation current), \u0111\u1ed3ng th\u1eddi \u0111\u01b0\u1ee3c ki\u1ec3m ch\u1ee9ng d\u1ef1a tr\u00ean h\u01b0\u1edbng d\u1eabn c\u1ee7a nh\u00e0 cung c\u1ea5p PHY v\u00e0 k\u1ebft qu\u1ea3 ki\u1ec3m tra EMC. C\u00e1c b\u1ed9 l\u1ecdc chung (CMC) \u0111\u00f3ng vai tr\u00f2 trung t\u00e2m trong <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-17548-lan-transformer.htm\">B\u1ed9 bi\u1ebfn \u00e1p LAN<\/a>LINK-PP: vi\u1ec7c ph\u1ed1i h\u1ee3p gi\u1eefa c\u00e1ch ly bi\u1ebfn \u00e1p v\u00e0 tr\u1edf kh\u00e1ng c\u0169ng nh\u01b0 \u0111\u1eb7c t\u00ednh b\u00e3o h\u00f2a c\u1ee7a b\u1ed9 l\u1ecdc \u0111\u1ea3m b\u1ea3o c\u1ea3 vi\u1ec7c tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n EMI v\u00e0 v\u1eadn h\u00e0nh \u1ed5n \u0111\u1ecbnh c\u1ee7a h\u1ec7 th\u1ed1ng. <\/p>\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\/266094ae75374acd880754a4ff6ee5fe.webp\" alt=\"LINK-PP LAN transformers\" class=\"wp-image-4277\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/266094ae75374acd880754a4ff6ee5fe.webp 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/266094ae75374acd880754a4ff6ee5fe-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/266094ae75374acd880754a4ff6ee5fe-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/266094ae75374acd880754a4ff6ee5fe-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/266094ae75374acd880754a4ff6ee5fe-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>","protected":false},"excerpt":{"rendered":"<p>Gi\u1ea3i th\u00edch v\u1ec1 B\u1ed9 l\u1ecdc ch\u1ebf \u0111\u1ed9 chung (CMC): T\u00ecm hi\u1ec3u c\u00e1ch CMC ch\u1eb7n nhi\u1ec5u ch\u1ebf \u0111\u1ed9 chung, b\u1ea3o to\u00e0n t\u00edn hi\u1ec7u Ethernet vi sai v\u00e0 c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt n\u00e0o quan tr\u1ecdng khi l\u1ef1a ch\u1ecdn CMC cho b\u1ed9 bi\u1ebfn \u00e1p LAN v\u00e0 PoE.<\/p>","protected":false},"author":1,"featured_media":4278,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[27],"tags":[23],"class_list":["post-4279","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary","tag-link-pp-lan-transformers"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4279","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/comments?post=4279"}],"version-history":[{"count":6,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4279\/revisions"}],"predecessor-version":[{"id":11062,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4279\/revisions\/11062"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media\/4278"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media?parent=4279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/categories?post=4279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/tags?post=4279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}