{"id":5577,"date":"2025-08-02T00:00:00","date_gmt":"2025-08-02T00:00:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/fec-forward-error-correction-in-optical-communication\/"},"modified":"2026-06-22T08:42:28","modified_gmt":"2026-06-22T08:42:28","slug":"fec-forward-error-correction-in-optical-communication","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/fec-forward-error-correction-in-optical-communication","title":{"rendered":"FEC (S\u1eeda l\u1ed7i ti\u1ebfn tr\u01b0\u1edbc) trong truy\u1ec1n th\u00f4ng quang l\u00e0 g\u00ec?"},"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\/9d91539e3f2f4415994b3a16805190dd.jpg\" alt=\"What Is FEC?\" class=\"wp-image-5576\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9d91539e3f2f4415994b3a16805190dd.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9d91539e3f2f4415994b3a16805190dd-300x178.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9d91539e3f2f4415994b3a16805190dd-1024x608.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9d91539e3f2f4415994b3a16805190dd-768x456.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9d91539e3f2f4415994b3a16805190dd-18x12.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>S\u1eeda l\u1ed7i ti\u1ebfn (FEC)<\/strong> l\u00e0 m\u1ed9t c\u00f4ng ngh\u1ec7 n\u1ec1n t\u1ea3ng trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng quang hi\u1ec7n \u0111\u1ea1i, \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u t\u1ed1c \u0111\u1ed9 cao tr\u00ean kho\u1ea3ng c\u00e1ch d\u00e0i. N\u00f3 n\u00e2ng cao t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch cho ph\u00e9p b\u1ed9 thu ph\u00e1t hi\u1ec7n v\u00e0 s\u1eeda c\u00e1c l\u1ed7i bit m\u00e0 kh\u00f4ng c\u1ea7n truy\u1ec1n l\u1ea1i. Kh\u1ea3 n\u0103ng n\u00e0y c\u1ea3i thi\u1ec7n \u0111\u1ed9 tin c\u1eady, hi\u1ec7u qu\u1ea3 v\u00e0 hi\u1ec7u su\u1ea5t trong c\u00e1c m\u1ea1ng quang.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u FEC l\u00e0 g\u00ec, c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng, c\u00e1c lo\u1ea1i m\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng, vai tr\u00f2 c\u1ee7a n\u00f3 trong <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\">b\u1ed9 thu ph\u00e1t quang<\/a>, c\u00e1c chu\u1ea9n Ethernet ph\u1ed5 bi\u1ebfn v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 tri\u1ec3n khai th\u1ef1c t\u1ebf.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udcd8 C\u01a1 Ch\u1ebf S\u1eeda L\u1ed7i Tr\u01b0\u1edbc (Forward Error Correction \u2013 FEC) L\u00e0 G\u00ec?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">C\u01a1 ch\u1ebf s\u1eeda l\u1ed7i tr\u01b0\u1edbc (FEC) l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt x\u1eed l\u00fd t\u00edn hi\u1ec7u s\u1ed1, trong \u0111\u00f3 th\u00eam c\u00e1c bit d\u01b0 th\u1eeba v\u00e0o lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u1ec3 b\u1ed9 thu c\u00f3 th\u1ec3 ch\u1ee7 \u0111\u1ed9ng nh\u1eadn di\u1ec7n v\u00e0 s\u1eeda c\u00e1c l\u1ed7i truy\u1ec1n d\u1eabn.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c m\u1ea1ng quang t\u1ed1c \u0111\u1ed9 cao (v\u00ed d\u1ee5: 25G, 100G, 200G, 400G), FEC l\u00e0 y\u1ebfu t\u1ed1 thi\u1ebft y\u1ebfu nh\u1eb1m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Gi\u1ea3m <strong>T\u1ef7 l\u1ec7 l\u1ed7i bit (Bit Error Rate \u2013<\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/understanding-what-is-bit-error-rate\/\"><strong>BER<\/strong><\/a><strong>)<\/strong><\/p><\/li><li><p>H\u1ed7 tr\u1ee3 <strong>kho\u1ea3ng c\u00e1ch truy\u1ec1n d\u1eabn d\u00e0i h\u01a1n<\/strong><\/p><\/li><li><p>\u0110\u1ea3m b\u1ea3o <strong>\u0111\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u<\/strong> trong \u0111i\u1ec1u ki\u1ec7n nhi\u1ec5u ho\u1eb7c suy hao<\/p><\/li><li><p>Duy tr\u00ec <strong>kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c<\/strong> tr\u00ean c\u00e1c m\u00f4i tr\u01b0\u1eddng \u0111a nh\u00e0 cung c\u1ea5p<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >\u2699\ufe0f FEC Ho\u1ea1t \u0110\u1ed9ng Nh\u01b0 Th\u1ebf N\u00e0o?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FEC m\u00e3 h\u00f3a d\u1eef li\u1ec7u xu\u1ea5t \u0111i b\u1eb1ng c\u00e1ch th\u00eam c\u00e1c bit d\u1ef1a tr\u00ean c\u00e1c quy t\u1eafc to\u00e1n h\u1ecdc \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh r\u00f5. B\u1ed9 thu s\u1eed d\u1ee5ng c\u00e1c bit n\u00e0y \u0111\u1ec3 ph\u00e1t hi\u1ec7n v\u00e0 s\u1eeda m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng gi\u1edbi h\u1ea1n l\u1ed7i do c\u00e1c suy gi\u1ea3m nh\u01b0 t\u00e1n s\u1eafc, nhi\u1ec5u ho\u1eb7c xuy\u00ean \u00e2m g\u00e2y ra.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >C\u00e1c Lo\u1ea1i M\u00e3 FEC Ph\u1ed5 Bi\u1ebfn:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>M\u00e3 Reed-Solomon (RS)<\/strong><br\/>C\u00e1c m\u00e3 kh\u1ed1i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong Ethernet v\u00e0 b\u1ed9 thu ph\u00e1t quang. C\u00e1c c\u1ea5u h\u00ecnh RS(528,514) v\u00e0 RS(544,514) c\u00f3 kh\u1ea3 n\u0103ng s\u1eeda nhi\u1ec1u l\u1ed7i k\u00fd hi\u1ec7u v\u00e0 ph\u00f9 h\u1ee3p \u0111\u1ec3 s\u1eeda l\u1ed7i ch\u00f9m.<\/p><\/li><li><p><strong>M\u00e3 BCH (Bose\u2013Chaudhuri\u2013Hocquenghem)<\/strong><br\/>C\u00e1c m\u00e3 nh\u1ecb ph\u00e2n cung c\u1ea5p kh\u1ea3 n\u0103ng s\u1eeda l\u1ed7i cao v\u1edbi \u0111\u1ed9 tr\u1ec5 th\u1ea5p, \u0111\u00f4i khi \u0111\u01b0\u1ee3c d\u00f9ng trong c\u00e1c h\u1ec7 th\u1ed1ng b\u1ecb gi\u1edbi h\u1ea1n v\u1ec1 ph\u1ea7n c\u1ee9ng. Vi\u1ec7c s\u1eed d\u1ee5ng m\u00e3 BCH trong c\u00e1c <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-pam4-four-level-pulse-amplitude-modulation-basics\/\">PAM4<\/a> h\u1ec7 th\u1ed1ng hi\u1ec7n \u0111\u1ea1i l\u00e0 r\u1ea5t h\u1ea1n ch\u1ebf.<\/p><\/li><li><p><strong>M\u00e3 LDPC (Low-Density Parity-Check)<\/strong><br\/>N\u1ed5i ti\u1ebfng nh\u1edd hi\u1ec7u su\u1ea5t g\u1ea7n gi\u1edbi h\u1ea1n Shannon, m\u00e3 LDPC \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong Ethernet 400G\/800G v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u1ed3ng pha. N\u00f3 cung c\u1ea5p kh\u1ea3 n\u0103ng s\u1eeda l\u1ed7i v\u01b0\u1ee3t tr\u1ed9i \u0111\u1ed1i v\u1edbi t\u1ef7 l\u1ec7 l\u1ed7i k\u00fd hi\u1ec7u cao, nh\u01b0ng \u0111\u00f2i h\u1ecfi b\u1ed9 gi\u1ea3i m\u00e3 ph\u1ee9c t\u1ea1p h\u01a1n v\u00e0 g\u00e2y th\u00eam \u0111\u1ed9 tr\u1ec5.<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\ud83d\udd0d V\u00ed D\u1ee5:<\/strong><\/p><p>Trong c\u00e1c h\u1ec7 th\u1ed1ng Ethernet 100G nh\u01b0 <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/488452.htm\"><strong>100GBASE-LR4<\/strong><\/a>, RS-FEC (th\u01b0\u1eddng l\u00e0 RS(528,514)) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u00f9 \u0111\u1eafp c\u00e1c suy hao quang tr\u00ean c\u00e1c \u0111\u01b0\u1eddng truy\u1ec1n s\u1ee3i quang kho\u1ea3ng c\u00e1ch xa. N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee5c ti\u00eau BER sau FEC l\u00e0 10\u207b\u00b9\u00b2 ho\u1eb7c t\u1ed1t h\u01a1n, ngay c\u1ea3 khi BER th\u00f4 tr\u01b0\u1edbc FEC c\u00f3 th\u1ec3 \u1edf m\u1ee9c 10\u207b\u00b3.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83e\udde9 V\u00ec sao FEC quan tr\u1ecdng trong b\u1ed9 thu ph\u00e1t quang<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FEC r\u1ea5t quan tr\u1ecdng trong <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\">module quang<br><\/a>, \u0111\u1eb7c bi\u1ec7t \u1edf t\u1ed1c \u0111\u1ed9 25 Gbps tr\u1edf l\u00ean. N\u00f3 cho ph\u00e9p:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>\u2705 Ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady tr\u00ean c\u00e1c \u0111o\u1ea1n c\u00e1p s\u1ee3i quang d\u00e0i h\u01a1n<\/p><\/li><li><p>\u2705 T\u01b0\u01a1ng th\u00edch v\u1edbi c\u00e1c th\u00e0nh ph\u1ea7n quang c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng th\u1ea5p h\u01a1n<\/p><\/li><li><p>\u2705 Kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c li\u1ec1n m\u1ea1ch gi\u1eefa thi\u1ebft b\u1ecb t\u1eeb c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t kh\u00e1c nhau<\/p><\/li><li><p>\u2705 \u0110\u1ea1t c\u00e1c m\u1ee5c ti\u00eau BER nghi\u00eam ng\u1eb7t, \u0111\u1eb7c bi\u1ec7t trong <strong>PAM4<\/strong> c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec1u ch\u1ebf<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">FEC cho ph\u00e9p s\u1eed d\u1ee5ng c\u00e1c th\u00e0nh ph\u1ea7n quang chi ph\u00ed th\u1ea5p b\u1eb1ng c\u00e1ch b\u00f9 \u0111\u1eafp c\u00e1c gi\u1edbi h\u1ea1n v\u1eadt l\u00fd th\u00f4ng qua hi\u1ec7u ch\u1ec9nh k\u1ef9 thu\u1eadt s\u1ed1. Tuy nhi\u00ean, <strong>\u0111\u1ed9 tr\u1ec5 FEC<\/strong> v\u00e0 lo\u1ea1i FEC \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u h\u1ec7 th\u1ed1ng v\u00e0 c\u00e1c ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udccf C\u00e1c ti\u00eau chu\u1ea9n FEC ph\u1ed5 bi\u1ebfn trong Ethernet<\/h2>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Ti\u00eau chu\u1ea9n<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Lo\u1ea1i FEC<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>\u1ee8ng d\u1ee5ng<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>IEEE 802.3bj<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>RS(528,514)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>100GBASE-CR4, 100GBASE-KR4 (NRZ)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>IEEE 802.3by<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>RS(528,514)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>25GBASE-CR-S (NRZ)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>IEEE 802.3cd<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>KP4-FEC (RS(544,514))<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>50G, 100G, 200G (PAM4)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>100G Lambda MSA<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>RS(544,514)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Quang h\u1ecdc 100G PAM4 m\u1ed9t k\u00eanh<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\ud83d\udd0e <strong>Note<\/strong>: RS(544,514), c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 KP4-FEC, l\u00e0 m\u1ed9t bi\u1ebfn th\u1ec3 m\u1ea1nh h\u01a1n, b\u1eaft bu\u1ed9c \u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean PAM4 do t\u1ef7 l\u1ec7 l\u1ed7i k\u00fd hi\u1ec7u v\u1ed1n cao h\u01a1n. Vi\u1ec7c t\u1eaft FEC tr\u00ean c\u00e1c li\u00ean k\u1ebft nh\u01b0 v\u1eady th\u01b0\u1eddng kh\u00f4ng \u0111\u01b0\u1ee3c cho ph\u00e9p theo ti\u00eau chu\u1ea9n.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" >\u26a0\ufe0f C\u00e1c y\u1ebfu t\u1ed1 c\u1ea7n l\u01b0u \u00fd quan tr\u1ecdng khi tri\u1ec3n khai FEC<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>FEC ph\u1ea3i \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t \u1edf c\u1ea3 hai \u0111\u1ea7u<\/strong> c\u1ee7a li\u00ean k\u1ebft quang. C\u1ea5u h\u00ecnh kh\u00f4ng kh\u1edbp (v\u00ed d\u1ee5: m\u1ed9t \u0111\u1ea7u b\u1eadt FEC, \u0111\u1ea7u kia kh\u00f4ng) c\u00f3 th\u1ec3 ng\u0103n ch\u1eb7n vi\u1ec7c thi\u1ebft l\u1eadp li\u00ean k\u1ebft ho\u1eb7c d\u1eabn \u0111\u1ebfn BER cao.<\/p><\/li><li><p><strong>C\u00e1c h\u1ec7 th\u1ed1ng PAM4<\/strong>, ch\u1eb3ng h\u1ea1n nh\u01b0 100G DR, 200G FR4 ho\u1eb7c 400G DR4, <strong>y\u00eau c\u1ea7u FEC<\/strong> \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c m\u1ee5c ti\u00eau BER t\u1ed1i thi\u1ec3u do \u0111\u1ecbnh d\u1ea1ng \u0111i\u1ec1u ch\u1ebf d\u00e0y \u0111\u1eb7c h\u01a1n.<\/p><\/li><li><p><strong>FEC l\u00e0m t\u0103ng \u0111\u1ed9 tr\u1ec5<\/strong> (v\u00ed d\u1ee5: kho\u1ea3ng 100\u2013200 ns \u0111\u1ed1i v\u1edbi KP4-FEC), \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 r\u1ea5t quan tr\u1ecdng trong c\u00e1c \u1ee9ng d\u1ee5ng nh\u1ea1y c\u1ea3m v\u1edbi \u0111\u1ed9 tr\u1ec5.<\/p><\/li><li><p><strong>BER sau FEC so v\u1edbi BER tr\u01b0\u1edbc FEC<\/strong>: H\u1ea7u h\u1ebft c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt h\u1ec7 th\u1ed1ng \u0111\u1ec1u \u0111\u1ec1 c\u1eadp \u0111\u1ebfn BER sau FEC. Vi\u1ec7c hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng khi \u0111\u00e1nh gi\u00e1 hi\u1ec7u n\u0103ng h\u1ec7 th\u1ed1ng.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udd0c H\u1ed7 tr\u1ee3 FEC trong c\u00e1c module quang LINK-PP<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1ea1i <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/\"><strong>LINK-PP<\/strong><\/a>, nhi\u1ec1u b\u1ed9 thu ph\u00e1t c\u1ee7a ch\u00fang t\u00f4i \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u01b0\u01a1ng th\u00edch \u0111\u1ea7y \u0111\u1ee7 v\u1edbi FEC theo c\u00e1c ti\u00eau chu\u1ea9n IEEE v\u00e0 MSA:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>V\u00ed d\u1ee5 s\u1ea3n ph\u1ea9m<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>FEC \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><a target=\"_self\" href=\"https:\/\/www.l-p.com\/store-26225-25g-sfp28-page2.htm?ca=1469&amp;cv=8172\">SFP28 25G SR<\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>RS(528,514)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Li\u00ean k\u1ebft trung t\u00e2m d\u1eef li\u1ec7u t\u1ea7m ng\u1eafn<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/473140.htm\">100G QSFP28 CWDM4<\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>RS(528,514) \/ KP4 t\u00f9y ch\u1ecdn<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>PAM4 2 km<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26045-400g-qsfp-dd-osfp-qsfp112.htm\">400G OSFP DR4<\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>KP4-FEC (RS(544,514))<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Li\u00ean k\u1ebft PAM4 t\u1eeb 500 m \u0111\u1ebfn 2 km<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1ea5t c\u1ea3 c\u00e1c module \u0111\u1ec1u \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u1ec1 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c, \u0111\u1ed9 dung n\u1ea1p FEC v\u00e0 s\u1ef1 tu\u00e2n th\u1ee7 c\u00e1c \u0111\u1eb7c t\u1ea3 giao di\u1ec7n v\u1eadt l\u00fd v\u00e0 \u0111i\u1ec7n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\u2753 C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C1: FEC \u0111\u01b0\u1ee3c x\u1eed l\u00fd b\u1edfi b\u1ed9 thu ph\u00e1t hay thi\u1ebft b\u1ecb ch\u1ee7?<\/strong><br\/>\u0110: FEC th\u01b0\u1eddng \u0111\u01b0\u1ee3c tri\u1ec3n khai trong thi\u1ebft b\u1ecb ch\u1ee7 (v\u00ed d\u1ee5: MAC c\u1ee7a b\u1ed9 chuy\u1ec3n m\u1ea1ch\/<a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-phy-physical-layer-basics-explained\/\">PHY<\/a>). H\u1ea7u h\u1ebft c\u00e1c module quang kh\u00f4ng ch\u1ee9a logic FEC nh\u01b0ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u01b0\u01a1ng th\u00edch v\u1edbi t\u00edn hi\u1ec7u c\u00f3 k\u00edch ho\u1ea1t FEC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C2: T\u00f4i c\u00f3 th\u1ec3 t\u1eaft FEC trong m\u1ea1ng c\u1ee7a m\u00ecnh kh\u00f4ng?<\/strong><br\/>\u0110: Ph\u1ee5 thu\u1ed9c v\u00e0o tr\u01b0\u1eddng h\u1ee3p. Tr\u00ean c\u00e1c li\u00ean k\u1ebft NRZ (v\u00ed d\u1ee5:, <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26192-10g-sfp.htm\">SFP+ 10G<\/a>), FEC c\u00f3 th\u1ec3 l\u00e0 t\u00f9y ch\u1ecdn. Tuy nhi\u00ean, tr\u00ean c\u00e1c h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean PAM4, FEC l\u00e0 b\u1eaft bu\u1ed9c theo ti\u00eau chu\u1ea9n v\u00e0 vi\u1ec7c t\u1eaft n\u00f3 c\u00f3 th\u1ec3 khi\u1ebfn li\u00ean k\u1ebft kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\u2705 K\u1ebft lu\u1eadn<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FEC kh\u00f4ng c\u00f2n l\u00e0 t\u00f9y ch\u1ecdn\u2014m\u00e0 l\u00e0 y\u1ebfu t\u1ed1 thi\u1ebft y\u1ebfu nh\u1eb1m duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a truy\u1ec1n th\u00f4ng quang t\u1ed1c \u0111\u1ed9 cao, \u0111\u1eb7c bi\u1ec7t khi ch\u00fang ta m\u1edf r\u1ed9ng l\u00ean PAM4 v\u00e0 c\u00e1c li\u00ean k\u1ebft c\u1ea5p terabit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D\u00f9 b\u1ea1n \u0111ang tri\u1ec3n khai <strong>25G<\/strong> Ethernet hay m\u1edf r\u1ed9ng l\u00ean m\u1ee9c <strong>800G<\/strong>, vi\u1ec7c hi\u1ec3u c\u00e1ch FEC ho\u1ea1t \u0111\u1ed9ng\u2014v\u00e0 l\u1ef1a ch\u1ecdn c\u00e1c module h\u1ed7 tr\u1ee3 \u0111\u1ea7y \u0111\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n FEC y\u00eau c\u1ea7u\u2014\u0111\u1ea3m b\u1ea3o t\u00ednh \u1ed5n \u0111\u1ecbnh, kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch v\u00e0 hi\u1ec7u n\u0103ng m\u1ea1ng d\u00e0i h\u1ea1n.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\ud83d\udd27 <strong>M\u1eb9o tri\u1ec3n khai<\/strong>: Lu\u00f4n \u0111\u1ea3m b\u1ea3o c\u00e0i \u0111\u1eb7t FEC \u0111\u01b0\u1ee3c b\u1eadt ho\u1eb7c t\u1eaft nh\u1ea5t qu\u00e1n \u1edf c\u1ea3 hai \u0111\u1ea7u c\u1ee7a \u0111\u01b0\u1eddng truy\u1ec1n \u0111\u1ec3 tr\u00e1nh l\u1ed7i kh\u00f4ng kh\u1edbp. Tham kh\u1ea3o b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a b\u1ed9 thu ph\u00e1t quang v\u00e0 h\u01b0\u1edbng d\u1eabn c\u1ea5u h\u00ecnh switch khi kh\u00f4ng ch\u1eafc ch\u1eafn.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" >Xem Th\u00eam<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/erbium-doped-fiber-amplifier-optical-networks\/\">T\u00ecm hi\u1ec3u vai tr\u00f2 c\u1ee7a b\u1ed9 khu\u1ebfch \u0111\u1ea1i quang EDFA trong m\u1ea1ng quang<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/how-optical-transceivers-transmit-data\/\">Quy tr\u00ecnh truy\u1ec1n d\u1eef li\u1ec7u b\u1eb1ng b\u1ed9 thu ph\u00e1t quang<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/filter-fwdm-optical-networks-applications\/\">Kh\u00e1m ph\u00e1 b\u1ed9 l\u1ecdc FWDM v\u00e0 t\u00e1c \u0111\u1ed9ng c\u1ee7a ch\u00fang \u0111\u1ebfn m\u1ea1ng quang<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/optical-transceivers-vs-fiber-converters\/\">So s\u00e1nh b\u1ed9 thu ph\u00e1t quang v\u00e0 b\u1ed9 chuy\u1ec3n \u0111\u1ed5i ph\u01b0\u01a1ng ti\u1ec7n quang-s\u1ee3i<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/common-fiber-connector-types-optical-transceivers\/\">C\u00e1c lo\u1ea1i \u0111\u1ea7u n\u1ed1i s\u1ee3i quang ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong b\u1ed9 thu ph\u00e1t quang<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>FEC (S\u1eeda l\u1ed7i ti\u1ebfn tr\u01b0\u1edbc) trong truy\u1ec1n th\u00f4ng quang th\u00eam \u0111\u1ed9 d\u01b0 th\u1eeba \u0111\u1ec3 ph\u00e1t hi\u1ec7n v\u00e0 s\u1eeda l\u1ed7i, \u0111\u1ea3m b\u1ea3o vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u t\u1ed1c \u0111\u1ed9 cao m\u1ed9t c\u00e1ch \u0111\u00e1ng tin c\u1eady.<\/p>","protected":false},"author":1,"featured_media":5576,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[27],"tags":[26],"class_list":["post-5577","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary","tag-optics-transceivers"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/5577","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=5577"}],"version-history":[{"count":5,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/5577\/revisions"}],"predecessor-version":[{"id":11284,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/5577\/revisions\/11284"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media\/5576"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media?parent=5577"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/categories?post=5577"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/tags?post=5577"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}