{"id":4909,"date":"2025-09-25T11:12:00","date_gmt":"2025-09-25T11:12:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/network-filter-lan-filter-guide\/"},"modified":"2026-06-22T06:43:54","modified_gmt":"2026-06-22T06:43:54","slug":"network-filter-lan-filter-guide","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/network-filter-lan-filter-guide","title":{"rendered":"B\u1ed9 l\u1ecdc m\u1ea1ng (B\u1ed9 l\u1ecdc LAN) l\u00e0 g\u00ec?"},"content":{"rendered":"<h2 class=\"wp-block-heading\" >\ud83c\udf10 B\u1ed9 l\u1ecdc m\u1ea1ng (B\u1ed9 l\u1ecdc LAN) l\u00e0 g\u00ec?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>B\u1ed9 l\u1ecdc m\u1ea1ng<\/strong> (th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ed9 l\u1ecdc LAN ho\u1eb7c b\u1ed9 l\u1ecdc Ethernet) l\u00e0 m\u1ed9t c\u1ee5m c\u00e1c th\u00e0nh ph\u1ea7n th\u1ee5 \u0111\u1ed9ng\u2014ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 <strong>cu\u1ed9n ch\u1ed1ng ch\u1ebf \u0111\u1ed9 chung (CMC)<\/strong>, <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-17548-lan-transformer.htm\">bi\u1ebfn \u00e1p c\u00e1ch ly<\/a>, v\u00e0 \u0111\u00f4i khi l\u00e0 c\u00e1c t\u1ee5 \u0111i\u1ec7n r\u1eddi r\u1ea1c ho\u1eb7c \u0111\u1ea7u cu\u1ed1i \u0111i\u1ec7n tr\u1edf\u2014\u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 suy gi\u1ea3m c\u00e1c t\u00edn hi\u1ec7u kh\u00f4ng mong mu\u1ed1n <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-electromagnetic-interference\/\">nhi\u1ec5u \u0111i\u1ec7n t\u1eeb (EMI)<\/a> trong khi cho ph\u00e9p c\u00e1c t\u00edn hi\u1ec7u Ethernet vi sai mong mu\u1ed1n \u0111i qua v\u1edbi \u0111\u1ed9 m\u00e9o t\u1ed1i thi\u1ec3u. C\u00e1c b\u1ed9 l\u1ecdc m\u1ea1ng gi\u1ea3m ph\u00e1t x\u1ea1 b\u1ee9c x\u1ea1, c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng mi\u1ec5n nhi\u1ec5m v\u1edbi nhi\u1ec5u b\u00ean ngo\u00e0i v\u00e0 b\u1ea3o v\u1ec7 m\u1ea1ch PHY kh\u1ecfi c\u00e1c xung qu\u00e1 \u00e1p lan truy\u1ec1n tr\u00ean c\u00e1p.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh b\u00ean trong b\u1ed9 l\u1ecdc LAN<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Cu\u1ed9n ch\u1ed1ng ch\u1ebf \u0111\u1ed9 chung (CMC):<\/strong> T\u1ea1o tr\u1edf kh\u00e1ng cao \u0111\u1ed1i v\u1edbi nhi\u1ec5u xu\u1ea5t hi\u1ec7n \u0111\u1ed3ng th\u1eddi tr\u00ean c\u1ea3 hai d\u00e2y d\u1eabn c\u1ee7a m\u1ed9t c\u1eb7p vi sai, trong khi h\u1ea7u nh\u01b0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00edn hi\u1ec7u vi sai. <\/p><\/li><li><p><strong>Bi\u1ebfn \u00e1p c\u00e1ch ly:<\/strong> Cung c\u1ea5p c\u00e1ch ly galvanic (th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c \u0111\u1ec3 \u0111\u00e1p \u1ee9ng <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/ieee-802-3-ethernet-standard-explained\/\">IEEE 802.3<\/a> m\u1ee9c c\u00e1ch ly c\u1ed5ng) v\u00e0 h\u1ed7 tr\u1ee3 kh\u1edbp tr\u1edf kh\u00e1ng c\u1eb7p vi sai. <\/p><\/li><li><p><strong>\u0110\u1ea7u cu\u1ed1i \/ TVS \/ <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-a-capacitor\/\"><strong>t\u1ee5 \u0111i\u1ec7n<\/strong><\/a><strong> (c\u00e1c th\u00e0nh ph\u1ea7n h\u1ed7 tr\u1ee3):<\/strong> \u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o v\u1ec7 ch\u1ed1ng ESD\/s\u00f3ng xung v\u00e0 cung c\u1ea5p c\u00e1c \u0111\u1ea7u cu\u1ed1i \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb nh\u01b0 m\u1ea1ng Bob Smith trong c\u00e1c \u1ee9ng d\u1ee5ng PoE.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 V\u00ec sao b\u1ed9 l\u1ecdc m\u1ea1ng quan tr\u1ecdng: EMI, c\u00e1ch ly v\u00e0 \u0111\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ed9 l\u1ecdc m\u1ea1ng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00ec ba l\u00fd do ch\u00ednh:<\/p>\n\n\n\n<ol class=\"wp-block-list\" >\n<li><p><strong>Kh\u1ed1ng ch\u1ebf EMI (ph\u00e1t x\u1ea1 &amp; mi\u1ec5n nhi\u1ec5m):<\/strong> C\u00e1c cu\u1ed9n ch\u1ed1ng ch\u1ebf \u0111\u1ed9 chung (CMC) l\u00e0m gi\u1ea3m d\u00f2ng \u0111i\u1ec7n ch\u1ebf \u0111\u1ed9 chung c\u00f3 th\u1ec3 g\u00e2y ph\u00e1t x\u1ea1 ho\u1eb7c b\u1ecb c\u1ea3m \u1ee9ng b\u1edfi c\u00e1c ngu\u1ed3n g\u1ea7n \u0111\u00f3. \u0110i\u1ec1u n\u00e0y gi\u00fap s\u1ea3n ph\u1ea9m v\u01b0\u1ee3t qua <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/emc-ems-emi-electromagnetic-compatibility-susceptibility-interference\/\">ki\u1ec3m tra EMC\/EMI<\/a> v\u00e0 gi\u1ea3m nhi\u1ec5u \u0111\u1ed1i v\u1edbi m\u00e1y thu v\u00f4 tuy\u1ebfn v\u00e0 c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m. <\/p><\/li><li><p><strong>C\u00e1ch ly &amp; an to\u00e0n:<\/strong> C\u00e1c bi\u1ebfn \u00e1p c\u00e1ch ly Ethernet cung c\u1ea5p r\u00e0o c\u1ea3n c\u00e1ch ly galvanic theo y\u00eau c\u1ea7u c\u1ee7a ti\u00eau chu\u1ea9n; nhi\u1ec1u thi\u1ebft k\u1ebf y\u00eau c\u1ea7u \u00edt nh\u1ea5t <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/lan-transformer-isolation-voltage-explained\/\">C\u00e1ch ly 1500 Vrms <\/a>gi\u1eefa \u0111\u01b0\u1eddng d\u00e2y v\u00e0 h\u1ec7 th\u1ed1ng nh\u1eb1m b\u1ea3o v\u1ec7 ng\u01b0\u1eddi d\u00f9ng v\u00e0 thi\u1ebft b\u1ecb.<\/p><\/li><li><p><strong>B\u1ea3o v\u1ec7 chip PHY v\u00e0 ho\u1ea1t \u0111\u1ed9ng PoE:<\/strong> C\u00e1c b\u1ed9 l\u1ecdc c\u00f9ng c\u00e1c s\u01a1 \u0111\u1ed3 TVS\/\u0111\u1ea7u cu\u1ed1i \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb gi\u1edbi h\u1ea1n m\u1ee9c ph\u01a1i nhi\u1ec5m s\u00f3ng xung v\u00e0 ESD, \u0111\u1ed3ng th\u1eddi h\u1ed7 tr\u1ee3 ho\u1ea1t \u0111\u1ed9ng PoE \u1ed5n \u0111\u1ecbnh b\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t h\u00e0nh vi ch\u1ebf \u0111\u1ed9 chung tr\u00ean c\u00e1c c\u1eb7p d\u00e2y c\u1ea5p \u0111i\u1ec7n. <\/p><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a cu\u1ed9n ch\u1ed1ng ch\u1ebf \u0111\u1ed9 chung trong b\u1ed9 bi\u1ebfn \u00e1p Ethernet<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t cu\u1ed9n ch\u1ed1ng ch\u1ebf \u0111\u1ed9 chung (CMC) \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf t\u1ed1t s\u1ebd \u0111\u01b0\u1ee3c qu\u1ea5n sao cho d\u00f2ng vi sai tri\u1ec7t ti\u00eau v\u1ec1 m\u1eb7t t\u1eeb t\u00ednh trong khi d\u00f2ng ch\u1ebf \u0111\u1ed9 chung c\u1ed9ng d\u1ed3n \u2014 k\u1ebft qu\u1ea3 l\u00e0 tr\u1edf kh\u00e1ng th\u1ea5p \u0111\u1ed1i v\u1edbi d\u1eef li\u1ec7u vi sai mong mu\u1ed1n v\u00e0 tr\u1edf kh\u00e1ng cao \u0111\u1ed1i v\u1edbi nhi\u1ec5u ch\u1ebf \u0111\u1ed9 chung kh\u00f4ng mong mu\u1ed1n. Trong nhi\u1ec1u module Ethernet, CMC \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p s\u1eb5n v\u1edbi <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/452766.htm\">bi\u1ebfn \u00e1p<\/a> ho\u1eb7c \u0111\u01b0\u1ee3c cung c\u1ea5p d\u01b0\u1edbi d\u1ea1ng th\u00e0nh ph\u1ea7n r\u1eddi t\u01b0\u01a1ng th\u00edch \u0111\u1ec3 duy tr\u00ec t\u1ef7 s\u1ed1 lo\u1ea1i b\u1ecf ch\u1ebf \u0111\u1ed9 chung (CMRR) tr\u00ean d\u1ea3i t\u1ea7n li\u00ean quan. C\u00e1c k\u1ef9 s\u01b0 thi\u1ebft k\u1ebf l\u1ef1a ch\u1ecdn cu\u1ed9n d\u00e2y ba s\u1ee3i\/b\u1ed1n s\u1ee3i v\u00e0 l\u00f5i c\u00f3 k\u00edch th\u01b0\u1edbc ph\u00f9 h\u1ee3p \u0111\u1ec3 tr\u00e1nh b\u00e3o h\u00f2a d\u01b0\u1edbi d\u00f2ng PoE. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 C\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng \u0111i\u1ec3n h\u00ecnh: n\u01a1i b\u1ea1n s\u1ebd t\u00ecm th\u1ea5y b\u1ed9 l\u1ecdc m\u1ea1ng<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Thi\u1ebft b\u1ecb ti\u00eau d\u00f9ng v\u00e0 thi\u1ebft b\u1ecb d\u00e0nh ri\u00eang cho audiophile:<\/strong> C\u00e1c b\u1ed9 l\u1ecdc Ethernet n\u1ed1i ti\u1ebfp \u0111\u01b0\u1ee3c qu\u1ea3ng b\u00e1 nh\u1eb1m gi\u1ea3m vi\u1ec7c b\u1eaft nhi\u1ec5u RF\/EMI trong c\u00e1c h\u1ec7 th\u1ed1ng \u00e2m thanh qua IP. M\u1eb7c d\u00f9 ch\u00fang kh\u00f4ng thay \u0111\u1ed5i t\u1ea3i d\u1eef li\u1ec7u k\u1ef9 thu\u1eadt s\u1ed1, nh\u01b0ng c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng \u00e2m thanh nghe \u0111\u01b0\u1ee3c do nhi\u1ec5u RFI g\u00e2y ra \u1edf thi\u1ebft b\u1ecb \u00e2m thanh ph\u00eda sau.<\/p><\/li><li><p><strong>Ethernet c\u00f4ng nghi\u1ec7p &amp; t\u1ef1 \u0111\u1ed9ng h\u00f3a:<\/strong> M\u00f4i tr\u01b0\u1eddng EMI kh\u1eafc nghi\u1ec7t v\u00e0 c\u00e1c \u0111\u01b0\u1eddng c\u00e1p d\u00e0i \u0111\u01b0\u1ee3c h\u01b0\u1edfng l\u1ee3i t\u1eeb c\u00e1c b\u1ed9 bi\u1ebfn \u00e1p m\u1ea1nh m\u1ebd (bi\u1ebfn \u00e1p + CMC) v\u00e0 b\u1ea3o v\u1ec7 ch\u1ed1ng<a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/esd-protection-link-pp-smart-factory-transceivers-rj45-cage\/\">ESD\/s\u00f3ng xung<\/a>. <\/p><\/li><li><p><strong>Thi\u1ebft b\u1ecb vi\u1ec5n th\u00f4ng &amp; d\u1eef li\u1ec7u:<\/strong> C\u00e1c switch, router v\u00e0 <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-phy-physical-layer-basics-explained\/\">PHY<\/a> module y\u00eau c\u1ea7u c\u00e1c b\u1ed9 bi\u1ebfn \u00e1p \u0111\u00e1p \u1ee9ng c\u00e1c m\u1ee5c ti\u00eau c\u00e1ch ly v\u00e0 hi\u1ec7u su\u1ea5t EMC theo ti\u00eau chu\u1ea9n IEEE. <\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 H\u01b0\u1edbng d\u1eabn l\u1ef1a ch\u1ecdn b\u1ed9 l\u1ecdc m\u1ea1ng: danh s\u00e1ch ki\u1ec3m tra th\u1ef1c t\u1ebf<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">S\u1eed d\u1ee5ng danh s\u00e1ch ki\u1ec3m tra n\u00e0y khi \u0111\u00e1nh gi\u00e1 b\u1ed9 l\u1ecdc LAN\/b\u1ed9 bi\u1ebfn \u00e1p cho thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>T\u01b0\u01a1ng th\u00edch v\u1edbi ti\u00eau chu\u1ea9n Ethernet v\u00e0 t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u:<\/strong> \u0110\u1ea3m b\u1ea3o c\u00e1c th\u00e0nh ph\u1ea7n h\u1ed7 tr\u1ee3 t\u1ed1c \u0111\u1ed9 li\u00ean k\u1ebft c\u1ee7a b\u1ea1n (10\/100\/1000\/2,5G\/10G t\u00f9y theo y\u00eau c\u1ea7u). C\u00e1c b\u1ed9 bi\u1ebfn \u00e1p t\u00edch h\u1ee3p \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh r\u00f5 theo t\u1eebng ti\u00eau chu\u1ea9n.<\/p><\/li><li><p><strong>\u0110\u1ecbnh m\u1ee9c c\u00e1ch ly:<\/strong> X\u00e1c minh \u0111\u1ecbnh m\u1ee9c c\u00e1ch ly c\u1ee7a bi\u1ebfn \u00e1p (th\u00f4ng th\u01b0\u1eddng \u22651500 Vrms theo IEEE-802.3). <\/p><\/li><li><p><strong>CMRR \/ t\u1ed5n hao ch\u00e8n:<\/strong> Ki\u1ec3m tra CMRR tr\u00ean d\u1ea3i t\u1ea7n v\u00e0 <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/insertion-loss-impact-on-rj45-magjack\/\">t\u1ed5n hao ch\u00e8n<\/a> t\u1ea1i d\u1ea3i b\u0103ng th\u00f4ng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ea1n \u0111\u1ec3 tr\u00e1nh suy gi\u1ea3m t\u00edn hi\u1ec7u.<\/p><\/li><li><p><strong>Kh\u1ea3 n\u0103ng ch\u1ecbu d\u00f2ng PoE v\u00e0 d\u1ef1 ph\u00f2ng b\u00e3o h\u00f2a:<\/strong> N\u1ebfu s\u1eed d\u1ee5ng <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.rj45-modularjack.com\/news\/faqs-for-power-over-ethernet-lan-transformers-234894.html\">PoE<\/a>, PoE, h\u00e3y x\u00e1c nh\u1eadn r\u1eb1ng l\u1ef1a ch\u1ecdn cu\u1ed9n\/ch\u1ea5t li\u1ec7u l\u00f5i h\u1ed7 tr\u1ee3 d\u00f2ng DC y\u00eau c\u1ea7u m\u00e0 kh\u00f4ng b\u1ecb b\u00e3o h\u00f2a.<\/p><\/li><li><p><strong>G\u00f3i s\u1ea3n ph\u1ea9m &amp; r\u00e0ng bu\u1ed9c nhi\u1ec7t\/bo m\u1ea1ch:<\/strong> Module d\u1ea1ng chip so v\u1edbi module r\u1eddi\u2014c\u1ea7n c\u00e2n nh\u1eafc di\u1ec7n t\u00edch b\u1ed1 tr\u00ed tr\u00ean PCB, ph\u01b0\u01a1ng th\u1ee9c l\u1eafp \u0111\u1eb7t (SMD ho\u1eb7c xuy\u00ean l\u1ed7) v\u00e0 suy gi\u1ea3m nhi\u1ec7t. <\/p><\/li><li><p><strong>L\u1ecbch s\u1eed tu\u00e2n th\u1ee7 quy \u0111\u1ecbnh v\u00e0 ki\u1ec3m tra EMC:<\/strong> \u01afu ti\u00ean c\u00e1c linh ki\u1ec7n ho\u1eb7c module c\u00f3 b\u00e1o c\u00e1o k\u1ebft qu\u1ea3 ki\u1ec3m tra EMC \u0111\u00e3 c\u00f4ng b\u1ed1 ho\u1eb7c ghi ch\u00fa \u1ee9ng d\u1ee5ng t\u1eeb nh\u00e0 cung c\u1ea5p.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 Ghi ch\u00fa thi\u1ebft k\u1ebf nhanh<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>\u0110\u1eb7t b\u1ed9 bi\u1ebfn \u00e1p (bi\u1ebfn \u00e1p + CMC) c\u00e0ng g\u1ea7n c\u1ed5ng RJ45 \/ \u0111i\u1ec3m v\u00e0o c\u00e1p c\u00e0ng t\u1ed1t \u0111\u1ec3 gi\u1ea3m di\u1ec7n t\u00edch v\u00f2ng l\u1eb7p tr\u00ean bo m\u1ea1ch.<\/p><\/li><li><p>S\u1eed d\u1ee5ng diode TVS c\u00f3 \u0111i\u1ec7n dung th\u1ea5p n\u1ebfu ghi ch\u00fa \u1ee9ng d\u1ee5ng c\u1ee7a nh\u00e0 cung c\u1ea5p khuy\u1ebfn ngh\u1ecb; \u0111i\u1ec7n dung l\u1edbn c\u00f3 th\u1ec3 l\u00e0m bi\u1ebfn d\u1ea1ng bi\u1ec3u \u0111\u1ed3 m\u1eaft \u1edf t\u1ed1c \u0111\u1ed9 cao.<\/p><\/li><li><p>Ki\u1ec3m tra bo m\u1ea1ch in ho\u00e0n ch\u1ec9nh trong \u0111i\u1ec1u ki\u1ec7n th\u1ef1c t\u1ebf v\u1ec1 EMC v\u00e0 ph\u00e1t x\u1ea1 ch\u1ebf \u0111\u1ed9 chung \u2014 m\u00f4 ph\u1ecfng h\u1ed7 tr\u1ee3 h\u1eefu \u00edch, nh\u01b0ng chi\u1ec1u d\u00e0i c\u00e1p th\u1ef1c t\u1ebf v\u00e0 gh\u00e9p n\u1ed1i v\u1edbi v\u1ecf thi\u1ebft b\u1ecb th\u01b0\u1eddng l\u00e0m l\u1ed9 c\u00e1c v\u1ea5n \u0111\u1ec1. <\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 S\u1ea3n ph\u1ea9m LINK-PP ph\u00f9 h\u1ee3p nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LINK-PP cung c\u1ea5p danh m\u1ee5c r\u1ed9ng c\u00e1c <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-17492-integrated-rj45-connector.htm\">b\u1ed9 bi\u1ebfn \u00e1p t\u00edch h\u1ee3p<span style=\"color: rgb(28, 27, 31); font-size: 14px;\"> <\/span>B\u1ed9 n\u1ed1i RJ45<\/a> and <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-17548-lan-transformer.htm\">B\u1ed9 bi\u1ebfn \u00e1p LAN<\/a> \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho \u1ee9ng d\u1ee5ng Ethernet v\u00e0 PoE. M\u1ed7i s\u1ea3n ph\u1ea9m \u0111i k\u00e8m b\u1ea3n v\u1ebd chi ti\u1ebft <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/file\/datasheet\/lp1107nl-drawing.pdf\">B\u1ea3n v\u1ebd s\u1ea3n ph\u1ea9m<\/a>, trong \u0111\u00f3 n\u00eau r\u00f5 t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u h\u1ed7 tr\u1ee3, \u0111i\u1ec7n \u00e1p c\u00e1ch ly v\u00e0 \u0111\u1ecbnh m\u1ee9c d\u00f2ng PoE.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f52f4cd9c25c44ee8e302f72220fb893.jpg\" alt=\"LAN transformers\" class=\"wp-image-4907\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f52f4cd9c25c44ee8e302f72220fb893.jpg 800w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f52f4cd9c25c44ee8e302f72220fb893-300x188.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f52f4cd9c25c44ee8e302f72220fb893-768x480.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f52f4cd9c25c44ee8e302f72220fb893-18x12.jpg 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 T\u00f3m t\u1eaft<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>A <strong>B\u1ed9 l\u1ecdc m\u1ea1ng<\/strong> B\u1ed9 l\u1ecdc m\u1ea1ng k\u1ebft h\u1ee3p c\u00e1c cu\u1ed9n ch\u1ed1ng ch\u1ebf \u0111\u1ed9 chung (CMC), bi\u1ebfn \u00e1p v\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n b\u1ea3o v\u1ec7 nh\u1eb1m gi\u1ea3m EMI, duy tr\u00ec \u0111\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u v\u00e0 \u0111\u00e1p \u1ee9ng c\u00e1c ti\u00eau chu\u1ea9n c\u00e1ch ly\/an to\u00e0n cho c\u1ed5ng Ethernet. <\/p><\/li><li><p>H\u00e3y ch\u1ecdn c\u00e1c b\u1ed9 l\u1ecdc ph\u00f9 h\u1ee3p v\u1edbi t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u, nhu c\u1ea7u PoE v\u00e0 m\u1ee5c ti\u00eau EMI c\u1ee7a b\u1ea1n; \u01b0u ti\u00ean c\u00e1c module \u0111\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u1edbi th\u00f4ng s\u1ed1 c\u00e1ch ly v\u00e0 CMRR r\u00f5 r\u00e0ng. <\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udf10 \u0110\u1ecdc th\u00eam<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 k\u1ef9 thu\u1eadt b\u1ed9 bi\u1ebfn \u00e1p Ethernet, b\u1ed9 l\u1ecdc v\u00e0 thi\u1ebft k\u1ebf EMC\/EMI, h\u00e3y kh\u00e1m ph\u00e1 c\u00e1c t\u00e0i nguy\u00ean c\u1ee7a LINK-PP:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/insertion-loss-impact-on-rj45-magjack\/\">\u1ea2nh h\u01b0\u1edfng c\u1ee7a t\u1ed5n hao ch\u00e8n l\u00ean Magjack RJ45<\/a><\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-phy-physical-layer-basics-explained\/\">PHY (L\u1edbp V\u1eadt l\u00fd) L\u00e0 G\u00ec \u2014 Gi\u1ea3i Th\u00edch C\u01a1 B\u1ea3n<\/a><\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/emc-ems-emi-electromagnetic-compatibility-susceptibility-interference\/\">T\u01b0\u01a1ng Th\u00edch \u0110i\u1ec7n T\u1eeb (EMC), \u0110\u1ed9 Nh\u1ea1y \u0110i\u1ec7n T\u1eeb (EMS) v\u00e0 Nhi\u1ec5u \u0110i\u1ec7n T\u1eeb (EMI)<\/a><\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-electromagnetic-interference\/\">Nhi\u1ec5u \u0110i\u1ec7n T\u1eeb (EMI) L\u00e0 G\u00ec<\/a><\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/esd-protection-link-pp-smart-factory-transceivers-rj45-cage\/\">B\u1ea3o V\u1ec7 Ch\u1ed1ng X\u1ea3 T\u0129nh \u0110i\u1ec7n (ESD) Trong B\u1ed9 Thu Ph\u00e1t Th\u00f4ng Minh LINK-PP v\u00e0 V\u1ecf RJ45<\/a><\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/lan-transformer-isolation-voltage-explained\/\">\u0110i\u1ec7n \u00c1p C\u00e1ch Ly C\u1ee7a Bi\u1ebfn \u00c1p LAN \u0110\u01b0\u1ee3c Gi\u1ea3i Th\u00edch<\/a><\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/ieee-802-3-ethernet-standard-explained\/\">Ti\u00eau chu\u1ea9n Ethernet IEEE 802.3 \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch<\/a><\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-a-capacitor\/\">T\u1ee5 \u0110i\u1ec7n L\u00e0 G\u00ec<\/a><\/p><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>B\u1ed9 l\u1ecdc m\u1ea1ng \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch: ch\u1ee9c n\u0103ng c\u1ee7a b\u1ed9 l\u1ecdc LAN v\u00e0 cu\u1ed9n c\u1ea3m chung tr\u00ean Ethernet, l\u00fd do ch\u00fang quan tr\u1ecdng \u0111\u1ed1i v\u1edbi EMI, c\u00e1ch ly v\u00e0 PoE, c\u0169ng nh\u01b0 c\u00e1ch ch\u1ecdn cu\u1ed9n c\u1ea3m RJ45 ph\u00f9 h\u1ee3p.<\/p>","protected":false},"author":1,"featured_media":4908,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[22,23],"class_list":["post-4909","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\/vi\/wp-json\/wp\/v2\/posts\/4909","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=4909"}],"version-history":[{"count":4,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4909\/revisions"}],"predecessor-version":[{"id":11071,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4909\/revisions\/11071"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media\/4908"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media?parent=4909"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/categories?post=4909"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/tags?post=4909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}