{"id":7291,"date":"2026-05-14T00:00:00","date_gmt":"2026-05-14T00:00:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/what-is-crc-cyclic-redundancy-check-errors\/"},"modified":"2026-06-22T03:25:21","modified_gmt":"2026-06-22T03:25:21","slug":"what-is-crc-cyclic-redundancy-check-errors","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-crc-cyclic-redundancy-check-errors","title":{"rendered":"L\u1ed7i ki\u1ec3m tra d\u01b0 v\u00f2ng (CRC) l\u00e0 g\u00ec v\u00e0 nguy\u00ean nh\u00e2n ph\u00e1t sinh"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"628\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/57e37cbeac654554aea2d041511b0dfc.jpg\" alt=\"What Is CRC Cyclic Redundancy Check Errors and Why Happen\" class=\"wp-image-7281\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/57e37cbeac654554aea2d041511b0dfc.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/57e37cbeac654554aea2d041511b0dfc-300x157.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/57e37cbeac654554aea2d041511b0dfc-1024x536.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/57e37cbeac654554aea2d041511b0dfc-768x402.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/57e37cbeac654554aea2d041511b0dfc-18x9.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Trong giao ti\u1ebfp k\u1ef9 thu\u1eadt s\u1ed1 hi\u1ec7n \u0111\u1ea1i, d\u1eef li\u1ec7u ph\u1ea3i \u0111\u01b0\u1ee3c truy\u1ec1n ch\u00ednh x\u00e1c gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb, m\u00e1y ch\u1ee7, h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef v\u00e0 m\u1ea1ng. Cho d\u00f9 b\u1ea1n \u0111ang chuy\u1ec3n t\u1ec7p, ph\u00e1t tr\u1ef1c tuy\u1ebfn video, s\u1eed d\u1ee5ng b\u1ed9 chuy\u1ec3n m\u1ea1ch Ethernet hay k\u1ebft n\u1ed1i t\u1ed1c \u0111\u1ed9 cao <a target=\"_self\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\">C\u00e1c m\u00f4-\u0111un SFP<\/a> trong m\u1ed9t <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/what-is-a-data-center\/\">trung t\u00e2m d\u1eef li\u1ec7u<\/a>, ngay c\u1ea3 m\u1ed9t bit b\u1ecb l\u1ed7i duy nh\u1ea5t c\u0169ng c\u00f3 th\u1ec3 g\u00e2y ra s\u1ef1 c\u1ed1 truy\u1ec1n d\u1eabn, m\u1ea5t g\u00f3i ho\u1eb7c d\u1eef li\u1ec7u b\u1ecb h\u1ecfng. \u0110\u00e2y l\u00e0 l\u00fac <strong>CRC (Ki\u1ec3m tra d\u01b0 th\u1eeba v\u00f2ng)<\/strong> tr\u1edf n\u00ean thi\u1ebft y\u1ebfu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>Ki\u1ec3m tra CRC<\/strong> l\u00e0 m\u1ed9t trong nh\u1eefng ph\u01b0\u01a1ng ph\u00e1p ph\u00e1t hi\u1ec7n l\u1ed7i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t trong m\u1ea1ng v\u00e0 truy\u1ec1n th\u00f4ng d\u1eef li\u1ec7u. N\u00f3 gi\u00fap c\u00e1c thi\u1ebft b\u1ecb x\u00e1c \u0111\u1ecbnh xem d\u1eef li\u1ec7u \u0111\u00e3 truy\u1ec1n c\u00f3 b\u1ecb thay \u0111\u1ed5i, l\u1ed7i ho\u1eb7c h\u1ecfng trong qu\u00e1 tr\u00ecnh truy\u1ec1n hay kh\u00f4ng. C\u00f4ng ngh\u1ec7 CRC th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ea1ng Ethernet, <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/what-is-a-router-key-functions-types\/\">servers<\/a>, <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/what-is-a-network-switch\/\">routers<\/a>, thi\u1ebft b\u1ecb l\u01b0u tr\u1eef, h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng c\u00f4ng nghi\u1ec7p, c\u00e1p quang v\u00e0 b\u1ed9 thu ph\u00e1t SFP nh\u1eb1m \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u v\u00e0 kh\u1ea3 n\u0103ng truy\u1ec1n th\u00f4ng \u0111\u00e1ng tin c\u1eady.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e1t hi\u1ec7n s\u1ef1 kh\u00f4ng kh\u1edbp trong qu\u00e1 tr\u00ecnh x\u00e1c minh, n\u00f3 s\u1ebd t\u1ea1o ra m\u1ed9t <strong>l\u1ed7i CRC<\/strong>. Nh\u1eefng l\u1ed7i n\u00e0y th\u01b0\u1eddng cho th\u1ea5y c\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 c\u00e1p b\u1ecb h\u1ecfng, nhi\u1ec5u \u0111i\u1ec7n t\u1eeb, suy hao t\u00edn hi\u1ec7u, ph\u1ea7n c\u1ee9ng l\u1ed7i, m\u00f4-\u0111un SFP kh\u00f4ng t\u01b0\u01a1ng th\u00edch, \u0111\u1ea7u n\u1ed1i <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/common-fiber-connector-types-optical-transceivers\/\">c\u00e1p quang<\/a>, b\u1ea9n ho\u1eb7c li\u00ean k\u1ebft m\u1ea1ng kh\u00f4ng \u1ed5n \u0111\u1ecbnh. Trong m\u00f4i tr\u01b0\u1eddng doanh nghi\u1ec7p, c\u00e1c l\u1ed7i CRC l\u1eb7p \u0111i l\u1eb7p l\u1ea1i c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t m\u1ea1ng, t\u0103ng s\u1ed1 l\u1ea7n truy\u1ec1n l\u1ea1i v\u00e0 g\u00e2y m\u1ea5t g\u00f3i tr\u00ean c\u00e1c li\u00ean k\u1ebft t\u1ed1c \u0111\u1ed9 cao.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ec CRC g\u1eafn b\u00f3 s\u00e2u s\u1eafc v\u1edbi c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng m\u1ea1ng hi\u1ec7n \u0111\u1ea1i, ng\u01b0\u1eddi d\u00f9ng th\u01b0\u1eddng t\u00ecm ki\u1ebfm c\u00e1c c\u00e2u h\u1ecfi nh\u01b0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>CRC trong m\u1ea1ng l\u00e0 g\u00ec?<\/p><\/li><li><p>L\u1ed7i ki\u1ec3m tra d\u01b0 th\u1eeba v\u00f2ng ngh\u0129a l\u00e0 g\u00ec?<\/p><\/li><li><p>CRC c\u00f3 t\u1ed1t h\u01a1n t\u1ed5ng ki\u1ec3m tra (checksum) kh\u00f4ng?<\/p><\/li><li><p>L\u00e0m c\u00e1ch n\u00e0o \u0111\u1ec3 kh\u1eafc ph\u1ee5c l\u1ed7i CRC tr\u00ean li\u00ean k\u1ebft Ethernet ho\u1eb7c c\u00e1p quang?<\/p><\/li><li><p>T\u1ea1i sao m\u00f4-\u0111un SFP l\u1ea1i hi\u1ec3n th\u1ecb l\u1ed7i CRC?<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c hi\u1ec3u c\u00e1ch CRC ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng ch\u1ec9 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi k\u1ef9 s\u01b0 m\u1ea1ng v\u00e0 qu\u1ea3n tr\u1ecb vi\u00ean CNTT, m\u00e0 c\u00f2n \u0111\u1ed1i v\u1edbi c\u00e1c doanh nghi\u1ec7p v\u1eadn h\u00e0nh m\u00e1y ch\u1ee7, b\u1ed9 chuy\u1ec3n m\u1ea1ch, thi\u1ebft b\u1ecb c\u00f4ng nghi\u1ec7p v\u00e0 h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng quang h\u1ecdc. Khi t\u1ed1c \u0111\u1ed9 m\u1ea1ng ti\u1ebfp t\u1ee5c ti\u1ebfn t\u1edbi 10G, 25G, 40G, 100G v\u00e0 cao h\u01a1n n\u1eefa, vi\u1ec7c ph\u00e1t hi\u1ec7n l\u1ed7i \u0111\u00e1ng tin c\u1eady tr\u1edf n\u00ean quan tr\u1ecdng h\u01a1n bao gi\u1edd h\u1ebft \u0111\u1ec3 duy tr\u00ec kh\u1ea3 n\u0103ng truy\u1ec1n d\u1eef li\u1ec7u \u1ed5n \u0111\u1ecbnh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong h\u01b0\u1edbng d\u1eabn n\u00e0y, b\u1ea1n s\u1ebd t\u00ecm hi\u1ec3u:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>CRC (Ki\u1ec3m tra d\u01b0 th\u1eeba v\u00f2ng) th\u1ef1c ch\u1ea5t l\u00e0 g\u00ec<\/p><\/li><li><p>C\u00e1ch ki\u1ec3m tra CRC ho\u1ea1t \u0111\u1ed9ng trong m\u1ea1ng v\u00e0 truy\u1ec1n d\u1eef li\u1ec7u<\/p><\/li><li><p>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa CRC v\u00e0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ed5ng ki\u1ec3m tra (checksum)<\/p><\/li><li><p>C\u00e1c nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn g\u00e2y ra l\u1ed7i CRC<\/p><\/li><li><p>C\u00e1ch kh\u1eafc ph\u1ee5c l\u1ed7i CRC trong m\u1ea1ng Ethernet v\u00e0 c\u00e1p quang<\/p><\/li><li><p>T\u1ea1i sao c\u00e1c v\u1ea5n \u0111\u1ec1 CRC th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n trong <a target=\"_self\" href=\"https:\/\/www.l-p.com\/store-25832-1-2-4g-transceiver-modules.htm\">b\u1ed9 thu ph\u00e1t quang<\/a><\/p><\/li><li><p>C\u00e1c th\u1ef1c ti\u1ec5n t\u1ed1t nh\u1ea5t \u0111\u1ec3 ng\u0103n ng\u1eeba c\u00e1c s\u1ef1 c\u1ed1 m\u1ea1ng li\u00ean quan \u0111\u1ebfn CRC<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ebfn cu\u1ed1i b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n s\u1ebd c\u00f3 hi\u1ec3u bi\u1ebft r\u00f5 r\u00e0ng v\u1ec1 c\u00e1ch CRC b\u1ea3o v\u1ec7 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u v\u00e0 v\u00ec sao c\u00e1c l\u1ed7i CRC tuy\u1ec7t \u0111\u1ed1i kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ecf qua trong c\u00e1c m\u00f4i tr\u01b0\u1eddng m\u1ea1ng hi\u1ec7n \u0111\u1ea1i.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udfe8 CRC (Ki\u1ec3m tra d\u01b0 th\u1eeba v\u00f2ng) l\u00e0 g\u00ec?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">CRC (Ki\u1ec3m tra d\u01b0 th\u1eeba v\u00f2ng) l\u00e0 m\u1ed9t m\u00e3 ph\u00e1t hi\u1ec7n l\u1ed7i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c minh xem d\u1eef li\u1ec7u k\u1ef9 thu\u1eadt s\u1ed1 c\u00f3 b\u1ecb l\u1ed7i trong qu\u00e1 tr\u00ecnh truy\u1ec1n ho\u1eb7c l\u01b0u tr\u1eef hay kh\u00f4ng. CRC t\u1ed3n t\u1ea1i b\u1edfi v\u00ec c\u00e1c li\u00ean k\u1ebft m\u1ea1ng, thi\u1ebft b\u1ecb l\u01b0u tr\u1eef v\u00e0 h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng c\u00f3 th\u1ec3 g\u1eb7p ph\u1ea3i nhi\u1ec5u, can nhi\u1ec5u, suy hao t\u00edn hi\u1ec7u ho\u1eb7c s\u1ef1 c\u1ed1 ph\u1ea7n c\u1ee9ng. CRC gi\u00fap c\u00e1c thi\u1ebft b\u1ecb ph\u00e1t hi\u1ec7n c\u00e1c g\u00f3i b\u1ecb h\u1ecfng ho\u1eb7c t\u1eadp tin b\u1ecb l\u1ed7i tr\u01b0\u1edbc khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn, do \u0111\u00f3 tr\u1edf th\u00e0nh m\u1ed9t c\u00f4ng ngh\u1ec7 c\u1ed1t l\u00f5i trong m\u1ea1ng Ethernet, h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef v\u00e0 m\u00f4-\u0111un quang h\u1ecdc SFP.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9e2332272bd4478899d224c36f0a5c6b.jpg\" alt=\"What Is CRC Cyclic Redundancy Check?\" class=\"wp-image-7282\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9e2332272bd4478899d224c36f0a5c6b.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9e2332272bd4478899d224c36f0a5c6b-300x169.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9e2332272bd4478899d224c36f0a5c6b-1024x576.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9e2332272bd4478899d224c36f0a5c6b-768x432.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/9e2332272bd4478899d224c36f0a5c6b-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >\u0110\u1ecbnh ngh\u0129a ng\u1eafn g\u1ecdn: CRC = M\u00e3 ph\u00e1t hi\u1ec7n l\u1ed7i<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CRC l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p to\u00e1n h\u1ecdc \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m tra xem d\u1eef li\u1ec7u nh\u1ecb ph\u00e2n c\u00f3 thay \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh truy\u1ec1n hay kh\u00f4ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ee5c \u0111\u00edch c\u1ee7a n\u00f3 r\u1ea5t \u0111\u01a1n gi\u1ea3n:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Ph\u00e1t hi\u1ec7n d\u1eef li\u1ec7u b\u1ecb l\u1ed7i tr\u01b0\u1edbc khi h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng d\u1eef li\u1ec7u \u0111\u00f3.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">CRC <strong>not<\/strong> kh\u00f4ng s\u1eeda ch\u1eefa d\u1eef li\u1ec7u.<br\/>N\u00f3 ch\u1ec9 ph\u00e1t hi\u1ec7n xem c\u00f3 x\u1ea3y ra l\u1ed7i hay kh\u00f4ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 l\u00fd do CRC \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>m\u1ea1ng Ethernet<\/p><\/li><li><p>b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn v\u00e0 b\u1ed9 chuy\u1ec3n m\u1ea1ch<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/ssd-solid-state-drive-explained\/\">SSD<\/a> and <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-an-hdd-hard-disk-drive\/\">HDD<\/a><\/p><\/li><li><p>truy\u1ec1n th\u00f4ng c\u00e1p quang<\/p><\/li><li><p><a target=\"_self\" href=\"https:\/\/www.l-p.com\/store-26155-1g-sfp.htm\">SFP<\/a> and <a target=\"_self\" href=\"https:\/\/www.l-p.com\/store-26153-40g-qsfp.htm\">QSFP<\/a> b\u1ed9 thu ph\u00e1t<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" >T\u1ea1i sao CRC t\u1ed3n t\u1ea1i?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Giao ti\u1ebfp k\u1ef9 thu\u1eadt s\u1ed1 kh\u00f4ng bao gi\u1edd ho\u00e0n to\u00e0n mi\u1ec5n nhi\u1ec5m l\u1ed7i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D\u1eef li\u1ec7u c\u00f3 th\u1ec3 b\u1ecb l\u1ed7i do:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-electromagnetic-interference\/\">Nhi\u1ec5u \u0111i\u1ec7n t\u1eeb<\/a> (EMI)<\/p><\/li><li><p>C\u00e1p b\u1ecb h\u1ecfng<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/attenuation-in-optical-transceiver-management-and-solutions\/\">T\u1ed5n hao t\u00edn hi\u1ec7u<\/a><\/p><\/li><li><p>\u0110\u1ea7u n\u1ed1i c\u00e1p quang b\u1ea9n<\/p><\/li><li><p>M\u00f4-\u0111un SFP l\u1ed7i<\/p><\/li><li><p>S\u1ef1 b\u1ea5t \u1ed5n c\u1ee7a ph\u1ea7n c\u1ee9ng<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu kh\u00f4ng c\u00f3 CRC, c\u00e1c thi\u1ebft b\u1ecb s\u1ebd kh\u00f4ng c\u00f3 c\u00e1ch \u0111\u00e1ng tin c\u1eady n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c g\u00f3i d\u1eef li\u1ec7u b\u1ecb l\u1ed7i ho\u1eb7c t\u1eadp tin b\u1ecb h\u1ecfng.<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 291px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"291\"><p>T\u00ecnh hu\u1ed1ng<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>K\u1ebft qu\u1ea3 CRC<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"291\"><p>Khung Ethernet b\u1ecb l\u1ed7i<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ph\u00e1t hi\u1ec7n l\u1ed7i<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"291\"><p>Truy\u1ec1n d\u1eabn c\u00e1p quang l\u1ed7i<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>T\u1eeb ch\u1ed1i g\u00f3i<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"291\"><p>L\u1ed7i bit trong l\u01b0u tr\u1eef<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ph\u00e1t hi\u1ec7n th\u1ea5t b\u1ea1i v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"291\"><p>Can nhi\u1ec5u m\u1ea1ng<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>X\u00e1c \u0111\u1ecbnh d\u1eef li\u1ec7u b\u1ecb l\u1ed7i<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >T\u1ea1i sao CRC quan tr\u1ecdng trong m\u1ea1ng Ethernet v\u00e0 SFP<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c ti\u00eau chu\u1ea9n Ethernet hi\u1ec7n \u0111\u1ea1i do Vi\u1ec7n K\u1ef9 s\u01b0 \u0110i\u1ec7n v\u00e0 \u0110i\u1ec7n t\u1eed (IEEE) ph\u00e1t tri\u1ec3n s\u1eed d\u1ee5ng tr\u01b0\u1eddng D\u00e3y ki\u1ec3m tra khung (FCS) d\u1ef1a tr\u00ean CRC \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c khung b\u1ecb l\u1ed7i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c m\u1ea1ng t\u1ed1c \u0111\u1ed9 cao nh\u01b0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_self\" href=\"https:\/\/www.l-p.com\/store-26192-10g-sfp.htm\">SFP+ 10G<\/a><\/p><\/li><li><p><a target=\"_self\" href=\"https:\/\/www.l-p.com\/store-26225-25g-sfp28.htm\">SFP28 25G<\/a><\/p><\/li><li><p><a target=\"_self\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\">100G QSFP28<\/a><\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c l\u1ed7i CRC th\u01b0\u1eddng cho th\u1ea5y:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u k\u00e9m<\/p><\/li><li><p>\u0110\u1ea7u n\u1ed1i quang b\u1ea9n<\/p><\/li><li><p>V\u1ea5n \u0111\u1ec1 li\u00ean k\u1ebft c\u00e1p quang<\/p><\/li><li><p>M\u00f4-\u0111un quang kh\u00f4ng t\u01b0\u01a1ng th\u00edch<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>C\u00e1c l\u1ed7i CRC th\u01b0\u1eddng l\u00e0 d\u1ea5u hi\u1ec7u c\u1ea3nh b\u00e1o s\u1edbm v\u1ec1 c\u00e1c v\u1ea5n \u0111\u1ec1 \u1edf t\u1ea7ng v\u1eadt l\u00fd c\u1ee7a m\u1ea1ng.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi k\u1ef9 s\u01b0 m\u1ea1ng, vi\u1ec7c gi\u00e1m s\u00e1t c\u00e1c b\u1ed9 \u0111\u1ebfm l\u1ed7i CRC l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong vi\u1ec7c duy tr\u00ec c\u00e1c li\u00ean k\u1ebft Ethernet v\u00e0 c\u00e1p quang \u1ed5n \u0111\u1ecbnh.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udfe8 CRC ph\u00e1t hi\u1ec7n l\u1ed7i d\u1eef li\u1ec7u nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">CRC ph\u00e1t hi\u1ec7n l\u1ed7i d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch t\u1ea1o m\u1ed9t gi\u00e1 tr\u1ecb t\u1ed5ng ki\u1ec3m tra to\u00e1n h\u1ecdc t\u1eeb d\u1eef li\u1ec7u g\u1ed1c tr\u01b0\u1edbc khi truy\u1ec1n. Khi d\u1eef li\u1ec7u \u0111\u1ebfn thi\u1ebft b\u1ecb nh\u1eadn, h\u1ec7 th\u1ed1ng s\u1ebd t\u00ednh l\u1ea1i gi\u00e1 tr\u1ecb CRC v\u00e0 so s\u00e1nh v\u1edbi gi\u00e1 tr\u1ecb ban \u0111\u1ea7u. N\u1ebfu hai gi\u00e1 tr\u1ecb kh\u00f4ng kh\u1edbp, thi\u1ebft b\u1ecb s\u1ebd bi\u1ebft r\u1eb1ng d\u1eef li\u1ec7u \u0111\u00e3 b\u1ecb l\u1ed7i trong qu\u00e1 tr\u00ecnh truy\u1ec1n ho\u1eb7c l\u01b0u tr\u1eef. Qu\u00e1 tr\u00ecnh n\u00e0y cho ph\u00e9p c\u00e1c b\u1ed9 chuy\u1ec3n m\u1ea1ch Ethernet, b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn, h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef v\u00e0 li\u00ean k\u1ebft quang h\u1ecdc SFP ph\u00e1t hi\u1ec7n nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3 c\u00e1c g\u00f3i b\u1ecb h\u1ecfng.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/00b1a69528084c57b03c7838bbfb952b.jpg\" alt=\"How Does CRC Detect Data Errors?\" class=\"wp-image-7283\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/00b1a69528084c57b03c7838bbfb952b.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/00b1a69528084c57b03c7838bbfb952b-300x169.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/00b1a69528084c57b03c7838bbfb952b-1024x576.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/00b1a69528084c57b03c7838bbfb952b-768x432.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/00b1a69528084c57b03c7838bbfb952b-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >Quy tr\u00ecnh ph\u00e1t hi\u1ec7n l\u1ed7i CRC trong 3 b\u01b0\u1edbc<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CRC ho\u1ea1t \u0111\u1ed9ng th\u00f4ng qua m\u1ed9t quy tr\u00ecnh x\u00e1c minh \u0111\u01a1n gi\u1ea3n:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 141px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"141\"><p>B\u01b0\u1edbc<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>\u0110i\u1ec1u x\u1ea3y ra<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>M\u1ee5c \u0111\u00edch<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"141\"><p>B\u01b0\u1edbc 1<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ng\u01b0\u1eddi g\u1eedi t\u00ednh to\u00e1n gi\u00e1 tr\u1ecb CRC t\u1eeb d\u1eef li\u1ec7u g\u1ed1c<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>T\u1ea1o m\u1ed9t ki\u1ec3m tra to\u00e0n v\u1eb9n \u0111\u1ed9c \u0111\u00e1o<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"141\"><p>B\u01b0\u1edbc 2<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>B\u1ed9 nh\u1eadn t\u00ednh l\u1ea1i CRC b\u1eb1ng d\u1eef li\u1ec7u \u0111\u00e3 nh\u1eadn<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>X\u00e1c minh t\u00ednh nh\u1ea5t qu\u00e1n c\u1ee7a d\u1eef li\u1ec7u<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"141\"><p>B\u01b0\u1edbc 3<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>H\u1ec7 th\u1ed1ng so s\u00e1nh c\u1ea3 hai gi\u00e1 tr\u1ecb CRC<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ph\u00e1t hi\u1ec7n l\u1ed7i truy\u1ec1n t\u1ea3i<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu c\u00e1c gi\u00e1 tr\u1ecb CRC kh\u1edbp nhau: D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c coi l\u00e0 h\u1ee3p l\u1ec7.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu c\u00e1c gi\u00e1 tr\u1ecb CRC kh\u00f4ng kh\u1edbp:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>H\u1ec7 th\u1ed1ng ph\u00e1t hi\u1ec7n s\u1ef1 sai l\u1ec7ch.<\/p><\/li><li><p>G\u00f3i tin ho\u1eb7c t\u1ec7p c\u00f3 th\u1ec3 b\u1ecb lo\u1ea1i b\u1ecf ho\u1eb7c truy\u1ec1n l\u1ea1i.<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" >V\u00ed d\u1ee5 \u0111\u01a1n gi\u1ea3n v\u1ec1 c\u00e1ch CRC ho\u1ea1t \u0111\u1ed9ng<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed9t b\u1ed9 chuy\u1ec3n m\u1ea1ch g\u1eedi khung Ethernet qua \u0111\u01b0\u1eddng truy\u1ec1n c\u00e1p quang s\u1eed d\u1ee5ng m\u00f4-\u0111un SFP.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" >Tr\u01b0\u1edbc khi truy\u1ec1n<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ed9 chuy\u1ec3n m\u1ea1ch:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>T\u1ea1o g\u00f3i d\u1eef li\u1ec7u<\/p><\/li><li><p>T\u00ednh gi\u00e1 tr\u1ecb CRC<\/p><\/li><li><p>Th\u00eam gi\u00e1 tr\u1ecb CRC v\u00e0o khung Ethernet<\/p><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" >Trong qu\u00e1 tr\u00ecnh truy\u1ec1n<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00edn hi\u1ec7u c\u00f3 th\u1ec3 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Nhi\u1ec5u \u0111i\u1ec7n t\u1eeb (EMI)<\/p><\/li><li><p>T\u1ed5n th\u1ea5t t\u00edn hi\u1ec7u quang<\/p><\/li><li><p>\u0110\u1ea7u n\u1ed1i c\u00e1p quang b\u1ea9n<\/p><\/li><li><p>C\u00e1p DAC\/AOC l\u1ed7i<\/p><\/li><li><p>M\u00f4-\u0111un SFP kh\u00f4ng t\u01b0\u01a1ng th\u00edch<\/p><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" >Sau khi nh\u1eadn<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Thi\u1ebft b\u1ecb nh\u1eadn:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>T\u00ednh l\u1ea1i gi\u00e1 tr\u1ecb CRC<\/p><\/li><li><p>So s\u00e1nh gi\u00e1 tr\u1ecb n\u00e0y v\u1edbi gi\u00e1 tr\u1ecb CRC ban \u0111\u1ea7u<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu ch\u1ec9 m\u1ed9t bit nh\u1ecb ph\u00e2n thay \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh truy\u1ec1n, c\u00e1c gi\u00e1 tr\u1ecb CRC s\u1ebd kh\u00e1c nhau v\u00e0 khung s\u1ebd b\u1ecb \u0111\u00e1nh d\u1ea5u l\u00e0 b\u1ecb sai l\u1ec7ch. CRC \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u1ef1 sai l\u1ec7ch d\u1eef li\u1ec7u ng\u1eabu nhi\u00ean, ch\u1ee9 kh\u00f4ng m\u00e3 h\u00f3a hay s\u1eeda ch\u1eefa d\u1eef li\u1ec7u.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >T\u1ea1i sao CRC hi\u1ec7u qu\u1ea3 trong m\u1ea1ng Ethernet<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c ti\u00eau chu\u1ea9n Ethernet hi\u1ec7n \u0111\u1ea1i do Vi\u1ec7n K\u1ef9 s\u01b0 \u0110i\u1ec7n v\u00e0 \u0110i\u1ec7n t\u1eed (IEEE) ban h\u00e0nh s\u1eed d\u1ee5ng tr\u01b0\u1eddng Chu\u1ed7i Ki\u1ec3m tra Khung (FCS) d\u1ef1a tr\u00ean CRC \u0111\u1ec3 x\u00e1c minh t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a khung \u1edf t\u1ea7ng 2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CRC r\u1ea5t hi\u1ec7u qu\u1ea3 v\u00ec n\u00f3 c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>L\u1ed7i m\u1ed9t bit<\/p><\/li><li><p>L\u1ed7i c\u1ee5m (burst errors)<\/p><\/li><li><p>S\u1ef1 sai l\u1ec7ch do nhi\u1ec5u<\/p><\/li><li><p>S\u1ef1 b\u1ea5t \u1ed5n trong truy\u1ec1n t\u1ea3i<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c m\u00f4i tr\u01b0\u1eddng Ethernet t\u1ed1c \u0111\u1ed9 cao nh\u01b0 10G, 25G v\u00e0 100G, vi\u1ec7c ki\u1ec3m tra CRC l\u00e0 thi\u1ebft y\u1ebfu \u0111\u1ec3 duy tr\u00ec kh\u1ea3 n\u0103ng giao nh\u1eadn g\u00f3i tin \u0111\u00e1ng tin c\u1eady v\u00e0 hi\u1ec7u n\u0103ng m\u1ea1ng \u1ed5n \u0111\u1ecbnh.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udfe8 T\u1ea1i sao x\u1ea3y ra l\u1ed7i CRC?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ed7i CRC th\u01b0\u1eddng kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 h\u1ec7 th\u1ed1ng CRC b\u1ecb h\u1ecfng. Trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, l\u1ed7i CRC cho th\u1ea5y d\u1eef li\u1ec7u \u0111\u00e3 b\u1ecb h\u1ecfng \u1edf \u0111\u00e2u \u0111\u00f3 trong qu\u00e1 tr\u00ecnh truy\u1ec1n do v\u1ea5n \u0111\u1ec1 \u1edf t\u1ea7ng v\u1eadt l\u00fd. C\u00e1c nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn bao g\u1ed3m c\u00e1p b\u1ecb h\u01b0 h\u1ea1i, \u0111\u1ea7u n\u1ed1i s\u1ee3i quang b\u1ea9n, nhi\u1ec5u \u0111i\u1ec7n t\u1eeb (EMI), suy hao t\u00edn hi\u1ec7u, c\u1ed5ng chuy\u1ec3n m\u1ea1ch l\u1ed7i ho\u1eb7c m\u00f4-\u0111un quang SFP kh\u00f4ng t\u01b0\u01a1ng th\u00edch. Trong m\u1ea1ng Ethernet, c\u00e1c l\u1ed7i CRC l\u1eb7p \u0111i l\u1eb7p l\u1ea1i th\u01b0\u1eddng l\u00e0 d\u1ea5u hi\u1ec7u ban \u0111\u1ea7u c\u1ee7a s\u1ef1 m\u1ea5t \u1ed5n \u0111\u1ecbnh li\u00ean k\u1ebft ho\u1eb7c suy gi\u1ea3m ph\u1ea7n c\u1ee9ng.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>L\u1ed7i CRC th\u01b0\u1eddng l\u00e0 bi\u1ec3u hi\u1ec7n c\u1ee7a c\u00e1c v\u1ea5n \u0111\u1ec1 truy\u1ec1n d\u1eabn \u2014 ch\u1ee9 kh\u00f4ng ph\u1ea3i v\u1ea5n \u0111\u1ec1 ph\u1ea7n m\u1ec1m.<\/p><\/blockquote>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/713d4f38d36e445695765d7e0d25f405.jpg\" alt=\"Why Do CRC Errors Happen?\" class=\"wp-image-7284\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/713d4f38d36e445695765d7e0d25f405.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/713d4f38d36e445695765d7e0d25f405-300x169.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/713d4f38d36e445695765d7e0d25f405-1024x576.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/713d4f38d36e445695765d7e0d25f405-768x432.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/713d4f38d36e445695765d7e0d25f405-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >Nguy\u00ean nh\u00e2n v\u00e0 t\u00e1c \u0111\u1ed9ng c\u1ee7a l\u1ed7i CRC<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ed7i CRC x\u1ea3y ra khi d\u1eef li\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c kh\u00f4ng kh\u1edbp v\u1edbi d\u1eef li\u1ec7u g\u1ed1c \u0111\u00e3 \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i.<\/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\u1ea5n \u0111\u1ec1 v\u1eadt l\u00fd<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>C\u00e1ch g\u00e2y ra l\u1ed7i CRC<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>M\u00f4i tr\u01b0\u1eddng ph\u1ed5 bi\u1ebfn<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>\u0110\u1ea7u n\u1ed1i s\u1ee3i quang b\u1ea9n<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>L\u00e0m suy gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u quang<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>```html<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>C\u00e1p \u0111\u1ed3ng b\u1ecb h\u01b0 h\u1ea1i<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>G\u00e2y ra s\u1ef1 sai l\u1ec7ch g\u00f3i tin<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>M\u1ea1ng Ethernet v\u0103n ph\u00f2ng<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Nhi\u1ec5u \u0111i\u1ec7n t\u1eeb (EMI)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>L\u00e0m gi\u00e1n \u0111o\u1ea1n vi\u1ec7c truy\u1ec1n d\u1eabn \u0111i\u1ec7n<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Nh\u00e0 m\u00e1y c\u00f4ng nghi\u1ec7p<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>M\u00f4-\u0111un SFP kh\u00f4ng t\u01b0\u01a1ng th\u00edch<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>G\u00e2y ra vi\u1ec7c th\u01b0\u01a1ng l\u01b0\u1ee3ng li\u00ean k\u1ebft kh\u00f4ng \u1ed5n \u0111\u1ecbnh<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>B\u1ed9 chuy\u1ec3n m\u1ea1ch doanh nghi\u1ec7p<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Kho\u1ea3ng c\u00e1ch truy\u1ec1n d\u1eabn v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>L\u00e0m t\u0103ng t\u1ef7 l\u1ec7 l\u1ed7i bit (BER)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u0110\u01b0\u1eddng c\u00e1p s\u1ee3i quang d\u00e0i<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>C\u1ed5ng chuy\u1ec3n m\u1ea1ch l\u1ed7i<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>L\u00e0m h\u1ecfng khung Ethernet<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ph\u1ea7n c\u1ee9ng c\u0169 k\u1ef9<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >V\u00ec sao l\u1ed7i CRC ph\u1ed5 bi\u1ebfn trong m\u1ea1ng SFP<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Trong m\u00f4i tr\u01b0\u1eddng Ethernet c\u00e1p quang, l\u1ed7i CRC th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn c\u00e1c v\u1ea5n \u0111\u1ec1 \u1edf t\u1ea7ng quang.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>\u0110\u1ea7u n\u1ed1i LC b\u1ecb nhi\u1ec5m b\u1ea9n c\u00f3 th\u1ec3 l\u00e0m t\u0103ng t\u1ed5n hao ch\u00e8n<\/p><\/li><li><p>C\u00e1c b\u1ed9 thu ph\u00e1t ch\u1ea5t l\u01b0\u1ee3ng k\u00e9m c\u00f3 th\u1ec3 t\u1ea1o ra t\u00edn hi\u1ec7u quang kh\u00f4ng \u1ed5n \u0111\u1ecbnh<\/p><\/li><li><p>Kh\u00f4ng kh\u1edbp <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/sfp-wavelengths-850nm-1310nm-1550nm-guide\/\">b\u01b0\u1edbc s\u00f3ng<\/a> c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m \u0111\u1ed9 tin c\u1eady truy\u1ec1n d\u1eabn<\/p><\/li><li><p>U\u1ed1n cong qu\u00e1 m\u1ee9c c\u00e1p quang c\u00f3 th\u1ec3 l\u00e0m suy y\u1ebfu t\u00ednh to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>SFP+ 10G<\/p><\/li><li><p>SFP28 25G<\/p><\/li><li><p>100G QSFP28<\/p><\/li><li><p>M\u1ea1ng spine-leaf trung t\u00e2m d\u1eef li\u1ec7u<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Khi t\u1ed1c \u0111\u1ed9 Ethernet t\u0103ng l\u00ean, bi\u00ean dung sai t\u00edn hi\u1ec7u tr\u1edf n\u00ean nh\u1ecf h\u01a1n, khi\u1ebfn vi\u1ec7c gi\u00e1m s\u00e1t l\u1ed7i CRC tr\u1edf n\u00ean quan tr\u1ecdng h\u01a1n \u0111\u1ed1i v\u1edbi \u0111\u1ed9 tin c\u1eady m\u1ea1ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >L\u1ed7i CRC so v\u1edbi m\u1ea5t g\u00f3i tin<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng nh\u1ea7m l\u1eabn l\u1ed7i CRC v\u1edbi m\u1ea5t g\u00f3i tin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u0110\u1ecbnh ngh\u0129a vi m\u00f4<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>L\u1ed7i CRC:<\/strong> Thi\u1ebft b\u1ecb nh\u1eadn d\u1eef li\u1ec7u b\u1ecb h\u1ecfng.<\/p><\/li><li><p><a target=\"_self\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-does-packet-loss-mean-for-your-internet-connection\/\"><strong>M\u1ea5t g\u00f3i tin<\/strong><\/a><strong>:<\/strong> G\u00f3i tin ch\u01b0a bao gi\u1edd \u0111\u1ebfn th\u00e0nh c\u00f4ng.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ed7i CRC th\u01b0\u1eddng x\u1ea3y ra tr\u01b0\u1edbc khi m\u1ea5t g\u00f3i tin tr\u1edf n\u00ean r\u00f5 r\u00e0ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 l\u00fd do k\u1ef9 s\u01b0 m\u1ea1ng theo d\u00f5i b\u1ed9 \u0111\u1ebfm l\u1ed7i CRC nh\u01b0 m\u1ed9t ch\u1ec9 b\u00e1o c\u1ea3nh b\u00e1o s\u1edbm v\u1ec1:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>S\u1ef1 m\u1ea5t \u1ed5n \u0111\u1ecbnh \u1edf t\u1ea7ng v\u1eadt l\u00fd<\/p><\/li><li><p>S\u1ef1 suy gi\u1ea3m quang h\u1ecdc<\/p><\/li><li><p>S\u1ef1 c\u1ed1 c\u00e1p<\/p><\/li><li><p>V\u1ea5n \u0111\u1ec1 truy\u1ec1n t\u1ea3i \u1edf c\u1ea5p c\u1ed5ng<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c m\u00f4i tr\u01b0\u1eddng doanh nghi\u1ec7p, vi\u1ec7c t\u0103ng d\u1ea7n s\u1ed1 l\u01b0\u1ee3ng l\u1ed7i CRC tr\u00ean c\u00e1c giao di\u1ec7n chuy\u1ec3n m\u1ea1ch th\u01b0\u1eddng y\u00eau c\u1ea7u \u0111i\u1ec1u tra ngay l\u1eadp t\u1ee9c tr\u01b0\u1edbc khi s\u1ef1 c\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u n\u0103ng \u1ee9ng d\u1ee5ng ho\u1eb7c kh\u1ea3 n\u0103ng s\u1eb5n s\u00e0ng d\u1ecbch v\u1ee5.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udfe8 L\u1ed7i CRC c\u00f3 \u00fd ngh\u0129a g\u00ec tr\u00ean m\u1ea1ng Ethernet v\u00e0 c\u00e1c module SFP?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean c\u00e1c m\u1ea1ng Ethernet v\u00e0 quang h\u1ecdc SFP, l\u1ed7i CRC th\u01b0\u1eddng cho th\u1ea5y c\u00e1c g\u00f3i d\u1eef li\u1ec7u \u0111\u00e3 b\u1ecb h\u1ecfng trong qu\u00e1 tr\u00ecnh truy\u1ec1n t\u1ea3i. Nguy\u00ean nh\u00e2n g\u1ed1c ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u \u1edf t\u1ea7ng v\u1eadt l\u00fd k\u00e9m ch\u1ee9 kh\u00f4ng ph\u1ea3i do l\u1ed7i ph\u1ea7n m\u1ec1m. C\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 \u0111\u1ea7u n\u1ed1i s\u1ee3i quang b\u1ea9n, c\u00e1p b\u1ecb h\u01b0 h\u1ea1i, c\u1ed5ng chuy\u1ec3n m\u1ea1ch kh\u00f4ng \u1ed5n \u0111\u1ecbnh, suy hao t\u00edn hi\u1ec7u ho\u1eb7c kh\u00f4ng t\u01b0\u01a1ng th\u00edch gi\u1eefa c\u00e1c module SFP\/SFP+ v\u00e0 <a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/473115.htm\">M\u00f4-\u0111un QSFP28<\/a> \u0111\u1ec1u c\u00f3 th\u1ec3 g\u00e2y ra l\u1ed7i khung CRC tr\u00ean c\u00e1c li\u00ean k\u1ebft Ethernet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong h\u1ea7u h\u1ebft c\u00e1c m\u1ea1ng doanh nghi\u1ec7p, l\u1ed7i CRC l\u00e0 d\u1ea5u hi\u1ec7u c\u1ea3nh b\u00e1o \u1edf t\u1ea7ng v\u1eadt l\u00fd.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/576969458fd94a4ebafdb65aa8003cdd.jpg\" alt=\"What Do CRC Errors Mean on Ethernet and SFP Modules?\" class=\"wp-image-7285\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/576969458fd94a4ebafdb65aa8003cdd.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/576969458fd94a4ebafdb65aa8003cdd-300x169.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/576969458fd94a4ebafdb65aa8003cdd-1024x576.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/576969458fd94a4ebafdb65aa8003cdd-768x432.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/576969458fd94a4ebafdb65aa8003cdd-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >T\u1ea1i sao l\u1ed7i CRC l\u1ea1i quan tr\u1ecdng trong m\u1ea1ng Ethernet<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c m\u1ea1ng Ethernet hi\u1ec7n \u0111\u1ea1i d\u1ef1a v\u00e0o vi\u1ec7c x\u00e1c th\u1ef1c t\u00ednh to\u00e0n v\u1eb9n g\u00f3i tin b\u1eb1ng chu\u1ed7i ki\u1ec3m tra khung (FCS) d\u1ef1a tr\u00ean CRC \u1edf t\u1ea7ng 2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi m\u1ed9t b\u1ed9 chuy\u1ec3n m\u1ea1ch, b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn ho\u1eb7c <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-nic-network-interface-card\/\">NIC<\/a> nh\u1eadn m\u1ed9t khung c\u00f3 gi\u00e1 tr\u1ecb CRC kh\u00f4ng h\u1ee3p l\u1ec7:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Khung \u0111\u00f3 \u0111\u01b0\u1ee3c coi l\u00e0 b\u1ecb h\u1ecfng<\/p><\/li><li><p>G\u00f3i tin b\u1ecb lo\u1ea1i b\u1ecf<\/p><\/li><li><p>Vi\u1ec7c truy\u1ec1n l\u1ea1i c\u00f3 th\u1ec3 x\u1ea3y ra<\/p><\/li><li><p>Hi\u1ec7u n\u0103ng m\u1ea1ng c\u00f3 th\u1ec3 suy gi\u1ea3m<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 l\u00fd do v\u00ec sao b\u1ed9 \u0111\u1ebfm CRC th\u01b0\u1eddng \u0111\u01b0\u1ee3c gi\u00e1m s\u00e1t tr\u00ean:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>C\u1ed5ng chuy\u1ec3n m\u1ea1ch<\/p><\/li><li><p>Li\u00ean k\u1ebft l\u00ean SFP\/SFP+<\/p><\/li><li><p>Li\u00ean k\u1ebft trung t\u00e2m d\u1eef li\u1ec7u QSFP28<\/p><\/li><li><p>B\u1ed9 chuy\u1ec3n m\u1ea1ch t\u1eadp trung s\u1ee3i quang<\/p><\/li><li><p>C\u01a1 s\u1edf h\u1ea1 t\u1ea7ng Ethernet l\u00f5i<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c m\u00f4i tr\u01b0\u1eddng Ethernet t\u1ed1c \u0111\u1ed9 cao 10G, 25G, 40G v\u00e0 100G, l\u1ed7i CRC l\u1eb7p \u0111i l\u1eb7p l\u1ea1i th\u01b0\u1eddng cho th\u1ea5y t\u00edn hi\u1ec7u truy\u1ec1n t\u1ea3i kh\u00f4ng \u1ed5n \u0111\u1ecbnh \u1edf \u0111\u00e2u \u0111\u00f3 trong li\u00ean k\u1ebft.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >C\u00e1c t\u00ecnh hu\u1ed1ng l\u1ed7i CRC ph\u1ed5 bi\u1ebfn tr\u00ean li\u00ean k\u1ebft SFP v\u00e0 Ethernet<\/h3>\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;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Thi\u1ebft b\u1ecb \/ T\u00ecnh hu\u1ed1ng<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>C\u00e1c tri\u1ec7u ch\u1ee9ng ph\u1ed5 bi\u1ebfn<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>C\u00e1c nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>\u0110i\u1ec1u c\u1ea7n ki\u1ec3m tra \u0111\u1ea7u ti\u00ean<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Li\u00ean k\u1ebft s\u1ee3i quang SFP+<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>S\u1ed1 l\u01b0\u1ee3ng l\u1ed7i CRC t\u0103ng d\u1ea7n<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u0110\u1ea7u n\u1ed1i LC b\u1ea9n<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>L\u00e0m s\u1ea1ch m\u1eb7t cu\u1ed1i s\u1ee3i quang<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Li\u00ean k\u1ebft 100G QSFP28<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>M\u1ea5t g\u00f3i tin<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>T\u1ed5n hao quang qu\u00e1 m\u1ee9c<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ki\u1ec3m tra m\u1ee9c c\u00f4ng su\u1ea5t quang<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>C\u1ed5ng chuy\u1ec3n m\u1ea1ch Ethernet<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>L\u1ed7i khung<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ph\u1ea7n c\u1ee9ng c\u1ed5ng b\u1ecb l\u1ed7i<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Chuy\u1ec3n c\u00e1p sang c\u1ed5ng kh\u00e1c<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/direct-attach-cables-dac-in-networking\/\">C\u00e1p DAC<\/a> k\u1ebft n\u1ed1i<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u0110\u1ec9nh \u0111i\u1ec3m l\u1ed7i CRC kh\u00f4ng li\u00ean t\u1ee5c<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>C\u00e1p DAC ch\u1ea5t l\u01b0\u1ee3ng th\u1ea5p<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Thay th\u1ebf c\u00e1p DAC<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Li\u00ean k\u1ebft s\u1ee3i quang kho\u1ea3ng c\u00e1ch xa<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>L\u1ed7i CRC + truy\u1ec1n l\u1ea1i<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>T\u1ed5n hao t\u00edn hi\u1ec7u<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>X\u00e1c minh kho\u1ea3ng c\u00e1ch truy\u1ec1n t\u1ea3i<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Linh ki\u1ec7n quang c\u1ee7a nhi\u1ec1u nh\u00e0 cung c\u1ea5p kh\u00e1c nhau<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>M\u1ea5t \u1ed5n \u0111\u1ecbnh li\u00ean k\u1ebft<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/how-to-test-sfp-compatibility\/\">SFP c\u1ee7a b\u00ean th\u1ee9 ba<\/a> s\u1ef1 c\u1ed1<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ki\u1ec3m tra c\u00e1c module \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >L\u1ed7i CRC tr\u00ean c\u1ed5ng chuy\u1ec3n m\u1ea1ch<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean c\u00e1c b\u1ed9 chuy\u1ec3n m\u1ea1ch Ethernet \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd, l\u1ed7i CRC th\u01b0\u1eddng hi\u1ec3n th\u1ecb trong:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Th\u1ed1ng k\u00ea giao di\u1ec7n<\/p><\/li><li><p>B\u1ea3ng \u0111i\u1ec1u khi\u1ec3n gi\u00e1m s\u00e1t c\u1ed5ng<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/simple-network-management-protocol-snmp-network-monitoring\/\">SNMP<\/a> B\u1ed9 \u0111\u1ebfm<\/p><\/li><li><p>C\u00e1c l\u1ec7nh ch\u1ea9n \u0111o\u00e1n CLI<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>C\u00e1c b\u1ed9 chuy\u1ec3n m\u1ea1ch Cisco c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb \u201cl\u1ed7i \u0111\u1ea7u v\u00e0o\u201d v\u00e0 \u201cCRC\u201d<\/p><\/li><li><p>C\u00e1c thi\u1ebft b\u1ecb Juniper c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb l\u1ed7i FCS Ethernet<\/p><\/li><li><p>C\u00e1c b\u1ed9 chuy\u1ec3n m\u1ea1ch MikroTik v\u00e0 HPE theo d\u00f5i c\u00e1c l\u1ed7i ki\u1ec3m tra khung<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu s\u1ed1 l\u01b0\u1ee3ng l\u1ed7i CRC ti\u1ebfp t\u1ee5c t\u0103ng theo th\u1eddi gian, k\u1ef9 s\u01b0 m\u1ea1ng th\u01b0\u1eddng \u0111i\u1ec1u tra:<\/p>\n\n\n\n<ol class=\"wp-block-list\" >\n<li><p>\u0110\u1ed9 s\u1ea1ch c\u1ee7a c\u00e1p quang<\/p><\/li><li><p>\u0110\u1ed9 nguy\u00ean v\u1eb9n c\u1ee7a c\u00e1p<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/478230.htm\">M\u00f4-\u0111un quang<\/a> t\u01b0\u01a1ng th\u00edch<\/p><\/li><li><p>T\u00ecnh tr\u1ea1ng c\u1ed5ng chuy\u1ec3n m\u1ea1ch<\/p><\/li><li><p>C\u00e1c ngu\u1ed3n g\u00e2y nhi\u1ec5u \u0111i\u1ec7n t\u1eeb (EMI)<\/p><\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" >V\u00ec sao M\u00f4-\u0111un SFP Th\u01b0\u1eddng G\u00e2y Ra L\u1ed7i CRC<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SFP v\u00e0 <a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/482749.htm\">B\u1ed9 thu ph\u00e1t QSFP<\/a> ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ed1c \u0111\u1ed9 t\u00edn hi\u1ec7u r\u1ea5t cao.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>SFP+ 10G = t\u1ed1c \u0111\u1ed9 \u0111\u01b0\u1eddng truy\u1ec1n 10,3125 Gbps<\/p><\/li><li><p>SFP28 25G = 25,78125 Gbps<\/p><\/li><li><p>QSFP28 100G s\u1eed d\u1ee5ng 4 l\u00e0n \u0111i\u1ec7n<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u1ede c\u00e1c t\u1ed1c \u0111\u1ed9 n\u00e0y, ngay c\u1ea3 nh\u1eefng s\u1ef1 c\u1ed1 nh\u1ecf \u1edf t\u1ea7ng v\u1eadt l\u00fd c\u0169ng c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng g\u00f3i tin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn li\u00ean quan \u0111\u1ebfn SFP g\u00e2y ra l\u1ed7i CRC bao g\u1ed3m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Sai l\u1ec7ch c\u0103n ch\u1ec9nh quang h\u1ecdc<\/p><\/li><li><p>\u0110\u1ea7u n\u1ed1i s\u1ee3i quang b\u1ea9n<\/p><\/li><li><p>T\u1ed5n hao ch\u00e8n qu\u00e1 m\u1ee9c<\/p><\/li><li><p>B\u1ed9 thu ph\u00e1t b\u1ecb qu\u00e1 nhi\u1ec7t<\/p><\/li><li><p>M\u00f4-\u0111un quang kh\u00f4ng \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3<\/p><\/li><li><p>Thi\u1ebft b\u1ecb quang ch\u1ea5t l\u01b0\u1ee3ng th\u1ea5p c\u1ee7a b\u00ean th\u1ee9 ba<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 l\u00fd do trung t\u00e2m d\u1eef li\u1ec7u v\u00e0 m\u1ea1ng vi\u1ec5n th\u00f4ng th\u01b0\u1eddng s\u1eed d\u1ee5ng:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/ddm-dom-in-optical-transceivers\/\">DOM\/DDM<\/a> Gi\u00e1m s\u00e1t quang h\u1ecdc<\/p><\/li><li><p>Theo d\u00f5i b\u1ed9 \u0111\u1ebfm CRC<\/p><\/li><li><p>Ph\u00e2n t\u00edch BER (<a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/understanding-what-is-bit-error-rate\/\">T\u1ef7 l\u1ec7 l\u1ed7i bit<\/a>)<\/p><\/li><li><p>Ch\u1ea9n \u0111o\u00e1n c\u00f4ng su\u1ea5t quang<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0111\u1ec3 ch\u1ee7 \u0111\u1ed9ng x\u00e1c \u0111\u1ecbnh c\u00e1c k\u1ebft n\u1ed1i s\u1eafp h\u1ecfng tr\u01b0\u1edbc khi x\u1ea3y ra s\u1ef1 c\u1ed1.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >L\u1ed7i CRC Th\u01b0\u1eddng L\u00e0 D\u1ea5u Hi\u1ec7u S\u1edbm C\u1ee7a S\u1ef1 C\u1ed1 K\u1ebft N\u1ed1i<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ed7i CRC hi\u1ebfm khi xu\u1ea5t hi\u1ec7n ri\u00eang l\u1ebb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong tri\u1ec3n khai th\u1ef1c t\u1ebf, ch\u00fang th\u01b0\u1eddng \u0111i k\u00e8m v\u1edbi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Vi\u1ec7c truy\u1ec1n l\u1ea1i g\u00f3i tin<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-throughput-in-network-communication-explained\/\">Gi\u1ea3m<\/a> th\u00f4ng l\u01b0\u1ee3ng<\/p><\/li><li><p>\u0110\u1ec9nh \u0111\u1ed9 tr\u1ec5<\/p><\/li><li><p>Hi\u1ec7n t\u01b0\u1ee3ng nh\u1ea5p nh\u00e1y giao di\u1ec7n<\/p><\/li><li><p>\u1ee8ng d\u1ee5ng m\u1ea5t \u1ed5n \u0111\u1ecbnh<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ec l\u00fd do n\u00e0y, c\u00e1c k\u1ef9 s\u01b0 m\u1ea1ng gi\u00e0u kinh nghi\u1ec7m coi c\u00e1c l\u1ed7i CRC l\u1eb7p \u0111i l\u1eb7p l\u1ea1i nh\u01b0 m\u1ed9t c\u1ea3nh b\u00e1o s\u1edbm v\u1ec1 h\u1ea1 t\u1ea7ng thay v\u00ec m\u1ed9t sai l\u1ec7ch th\u1ed1ng k\u00ea nh\u1ecf. M\u1ed9t b\u1ed9 \u0111\u1ebfm CRC t\u0103ng d\u1ea7n th\u01b0\u1eddng cho th\u1ea5y ch\u1ea5t l\u01b0\u1ee3ng k\u1ebft n\u1ed1i Ethernet \u0111ang suy gi\u1ea3m.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udfe8 C\u00e1ch kh\u1eafc ph\u1ee5c l\u1ed7i CRC t\u1eebng b\u01b0\u1edbc<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1ch nhanh nh\u1ea5t \u0111\u1ec3 kh\u1eafc ph\u1ee5c l\u1ed7i CRC l\u00e0 ch\u1ea9n \u0111o\u00e1n l\u1edbp v\u1eadt l\u00fd tr\u01b0\u1edbc ti\u00ean. Trong h\u1ea7u h\u1ebft m\u1ea1ng Ethernet v\u00e0 SFP, l\u1ed7i CRC th\u01b0\u1eddng do c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 c\u00e1p, \u0111\u1ea7u n\u1ed1i s\u1ee3i quang b\u1ecb b\u1ea9n, m\u00f4-\u0111un quang kh\u00f4ng t\u01b0\u01a1ng th\u00edch, suy hao t\u00edn hi\u1ec7u ho\u1eb7c c\u1ed5ng chuy\u1ec3n m\u1ea1ch b\u1ecb l\u1ed7i. M\u1ed9t quy tr\u00ecnh kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 c\u00f3 c\u1ea5u tr\u00fac gi\u00fap k\u1ef9 s\u01b0 m\u1ea1ng nhanh ch\u00f3ng x\u00e1c \u0111\u1ecbnh nguy\u00ean nh\u00e2n g\u1ed1c tr\u01b0\u1edbc khi m\u1ea5t g\u00f3i, truy\u1ec1n l\u1ea1i ho\u1eb7c m\u1ea5t \u1ed5n \u0111\u1ecbnh li\u00ean k\u1ebft \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn l\u01b0u l\u01b0\u1ee3ng s\u1ea3n xu\u1ea5t.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/abb042b8e2724eb6bbbbcf2e62982445.jpg\" alt=\"How to Troubleshoot CRC Errors Step by Step\" class=\"wp-image-7286\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/abb042b8e2724eb6bbbbcf2e62982445.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/abb042b8e2724eb6bbbbcf2e62982445-300x169.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/abb042b8e2724eb6bbbbcf2e62982445-1024x576.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/abb042b8e2724eb6bbbbcf2e62982445-768x432.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/abb042b8e2724eb6bbbbcf2e62982445-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e1c ki\u1ec3m tra v\u1eadt l\u00fd \u0111\u01a1n gi\u1ea3n nh\u1ea5t tr\u01b0\u1edbc khi thay th\u1ebf ph\u1ea7n c\u1ee9ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >B\u01b0\u1edbc 1: Ki\u1ec3m tra c\u00e1p v\u00e0 k\u1ebft n\u1ed1i v\u1eadt l\u00fd<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 c\u00e1p v\u1eadt l\u00fd l\u00e0 m\u1ed9t trong nh\u1eefng nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn nh\u1ea5t g\u00e2y ra l\u1ed7i CRC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>D\u00e2y c\u00e1p Ethernet<\/p><\/li><li><p>D\u00e2y nh\u1ea3y quang<\/p><\/li><li><p>DAC\/<a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/aoc-explained-active-optical-cable-benefits-uses-advancements-guide\/\">C\u00e1p AOC<\/a><\/p><\/li><li><p>\u0110\u1ed9 c\u0103n ch\u1ec9nh \u0111\u1ea7u n\u1ed1i LC<\/p><\/li><li><p>B\u00e1n k\u00ednh u\u1ed1n cong c\u00e1p<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c tri\u1ec7u ch\u1ee9ng ph\u1ed5 bi\u1ebfn:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>\u0110\u1ec9nh \u0111i\u1ec3m l\u1ed7i CRC kh\u00f4ng li\u00ean t\u1ee5c<\/p><\/li><li><p>Vi\u1ec7c truy\u1ec1n l\u1ea1i g\u00f3i tin<\/p><\/li><li><p>Nh\u1ea5p nh\u00e1y li\u00ean k\u1ebft<\/p><\/li><li><p>Th\u00f4ng l\u01b0\u1ee3ng gi\u1ea3m<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Trong m\u1ea1ng quang, ngay c\u1ea3 b\u1ee5i vi m\u00f4 c\u0169ng c\u00f3 th\u1ec3 l\u00e0m t\u0103ng t\u1ed5n hao ch\u00e8n v\u00e0 l\u00e0m suy gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u quang.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >B\u01b0\u1edbc 2: X\u00e1c minh t\u00ednh t\u01b0\u01a1ng th\u00edch c\u1ee7a m\u00f4-\u0111un SFP ho\u1eb7c QSFP<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c b\u1ed9 chuy\u1ec3n m\u1ea1ch doanh nghi\u1ec7p, thi\u1ebft b\u1ecb quang kh\u00f4ng t\u01b0\u01a1ng th\u00edch th\u01b0\u1eddng ph\u00e1t sinh l\u1ed7i CRC v\u00e0 FCS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>T\u00ednh t\u01b0\u01a1ng th\u00edch nh\u00e0 cung c\u1ea5p<\/p><\/li><li><p>B\u01b0\u1edbc s\u00f3ng truy\u1ec1n d\u1eabn<\/p><\/li><li><p>Lo\u1ea1i c\u00e1p quang (<a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/ieee-802-3-ethernet-standard-explained\/\">SMF\/MMF<\/a>)<\/p><\/li><li><p>Ch\u1ea9n \u0111o\u00e1n DOM\/DDM<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/optical-transceivers-operating-temperature-range\/\">Nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng<\/a><\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/473141.htm\">10GBASE-SR<\/a> y\u00eau c\u1ea7u s\u1ee3i quang \u0111a mode<\/p><\/li><li><p><a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/476046.htm\">10GBASE-LR<\/a> y\u00eau c\u1ea7u s\u1ee3i quang \u0111\u01a1n mode<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c s\u1eed d\u1ee5ng thi\u1ebft b\u1ecb quang kh\u00f4ng ph\u00f9 h\u1ee3p c\u00f3 th\u1ec3 t\u1ea1o ra li\u00ean k\u1ebft Ethernet kh\u00f4ng \u1ed5n \u0111\u1ecbnh ngay c\u1ea3 khi giao di\u1ec7n v\u1eabn hi\u1ec3n th\u1ecb tr\u1ea1ng th\u00e1i \u201cup\u201d.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >B\u01b0\u1edbc 3: Gi\u00e1m s\u00e1t b\u1ed9 \u0111\u1ebfm l\u1ed7i CRC tr\u00ean c\u1ed5ng chuy\u1ec3n m\u1ea1ch<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c b\u1ed9 chuy\u1ec3n m\u1ea1ch \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd li\u00ean t\u1ee5c theo d\u00f5i:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>L\u1ed7i CRC<\/p><\/li><li><p>L\u1ed7i FCS<\/p><\/li><li><p>L\u1ed7i \u0111\u1ea7u v\u00e0o<\/p><\/li><li><p>Vi\u1ec7c lo\u1ea1i b\u1ecf giao di\u1ec7n<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu b\u1ed9 \u0111\u1ebfm l\u1ed7i CRC t\u0103ng d\u1ea7n theo th\u1eddi gian:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>So s\u00e1nh c\u1ea3 hai \u0111\u1ea7u c\u1ee7a li\u00ean k\u1ebft<\/p><\/li><li><p>Di chuy\u1ec3n c\u00e1p sang c\u1ed5ng kh\u00e1c<\/p><\/li><li><p>Ki\u1ec3m tra v\u1edbi b\u1ed9 thu ph\u00e1t kh\u00e1c<\/p><\/li><li><p>X\u00e1c \u0111\u1ecbnh xem l\u1ed7i \u0111i theo c\u00e1p hay theo c\u1ed5ng<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u0110\u1ecbnh ngh\u0129a vi m\u00f4<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>B\u1ed9 \u0111\u1ebfm l\u1ed7i CRC:<\/strong> S\u1ed1 khung b\u1ecb l\u1ed7i \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n tr\u00ean m\u1ed9t giao di\u1ec7n.<\/p><\/li><li><p><strong>L\u1ed7i FCS:<\/strong> Khung Ethernet kh\u00f4ng v\u01b0\u1ee3t qua ki\u1ec3m tra x\u00e1c th\u1ef1c CRC.<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" >B\u01b0\u1edbc 4: Ki\u1ec3m tra t\u1ed5n hao quang v\u00e0 kho\u1ea3ng c\u00e1ch truy\u1ec1n d\u1eabn<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1ed5n hao t\u00edn hi\u1ec7u tr\u1edf n\u00ean quan tr\u1ecdng h\u01a1n trong:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>SFP28 25G<\/p><\/li><li><p>100G QSFP28<\/p><\/li><li><p>RJ45 Ethernet works well for short office connections<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1ed5n hao ch\u00e8n qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 l\u00e0m t\u0103ng T\u1ef7 l\u1ec7 l\u1ed7i bit (BER), cu\u1ed1i c\u00f9ng d\u1eabn \u0111\u1ebfn l\u1ed7i h\u1ecfng khung CRC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">X\u00e1c minh:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>M\u1ee9c c\u00f4ng su\u1ea5t quang h\u1ecdc<br><\/p><\/li><li><p>Chi\u1ec1u d\u00e0i s\u1ee3i quang<\/p><\/li><li><p>T\u1ed5n hao \u0111\u1ea7u n\u1ed1i<\/p><\/li><li><p>Ch\u1ea5t l\u01b0\u1ee3ng b\u1ea3ng \u0111\u1ea5u d\u00e2y<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c m\u00f4i tr\u01b0\u1eddng Ethernet t\u1ed1c \u0111\u1ed9 cao, ngay c\u1ea3 vi\u1ec7c gi\u1ea3m nh\u1ecf nh\u1ea5t v\u1ec1 bi\u00ean d\u1ef1 ph\u00f2ng quang c\u0169ng c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t c\u00e1c l\u1ed7i CRC l\u1eb7p l\u1ea1i.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >B\u01b0\u1edbc 5: Ki\u1ec3m tra nh\u1eadt k\u00fd chuy\u1ec3n m\u1ea1ch v\u00e0 c\u1ea3nh b\u00e1o giao di\u1ec7n<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c b\u1ed9 chuy\u1ec3n m\u1ea1ch doanh nghi\u1ec7p t\u1eeb c\u00e1c c\u00f4ng ty nh\u01b0 Cisco, Juniper Networks v\u00e0 Arista Networks cung c\u1ea5p ch\u1ea9n \u0111o\u00e1n giao di\u1ec7n chi ti\u1ebft.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>S\u1ef1 ki\u1ec7n \u0111\u1eb7t l\u1ea1i giao di\u1ec7n<\/p><\/li><li><p>C\u1ea3nh b\u00e1o v\u1ec1 s\u1ef1 kh\u00f4ng \u1ed5n \u0111\u1ecbnh c\u1ee7a li\u00ean k\u1ebft<\/p><\/li><li><p>C\u1ea3nh b\u00e1o DOM<\/p><\/li><li><p>C\u1ea3nh b\u00e1o nhi\u1ec7t \u0111\u1ed9<\/p><\/li><li><p>Th\u1ed1ng k\u00ea s\u1ed1 g\u00f3i b\u1ecb lo\u1ea1i b\u1ecf<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c c\u1ea3nh b\u00e1o CRC l\u1eb7p l\u1ea1i k\u1ebft h\u1ee3p v\u1edbi s\u1ed1 l\u1ed7i giao di\u1ec7n t\u0103ng d\u1ea7n th\u01b0\u1eddng cho th\u1ea5y li\u00ean k\u1ebft v\u1eadt l\u00fd \u0111ang suy gi\u1ea3m.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Th\u00f4ng tin chuy\u00ean s\u00e2u th\u1ef1c t\u1ebf t\u1eeb k\u1ef9 s\u01b0<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c tri\u1ec3n khai trung t\u00e2m d\u1eef li\u1ec7u th\u1ef1c t\u1ebf, vi\u1ec7c kh\u1eafc ph\u1ee5c l\u1ed7i CRC th\u01b0\u1eddng tu\u00e2n theo m\u1ed9t nguy\u00ean t\u1eafc k\u1ef9 thu\u1eadt \u0111\u01a1n gi\u1ea3n:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>N\u1ebfu c\u00e1c l\u1ed7i CRC di chuy\u1ec3n c\u00f9ng c\u00e1p ho\u1eb7c b\u1ed9 thu ph\u00e1t quang, v\u1ea5n \u0111\u1ec1 th\u01b0\u1eddng n\u1eb1m ngo\u00e0i b\u1ed9 chuy\u1ec3n m\u1ea1ch <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-application-specific-integrated-circuit-asic\/\">ASIC<\/a>.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Nhi\u1ec1u \u0111\u1ed9i m\u1ea1ng kh\u1eafc ph\u1ee5c c\u00e1c v\u1ea5n \u0111\u1ec1 CRC dai d\u1eb3ng b\u1eb1ng c\u00e1ch:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Thay th\u1ebf c\u00e1p DAC ch\u1ea5t l\u01b0\u1ee3ng th\u1ea5p<\/p><\/li><li><p>L\u00e0m s\u1ea1ch \u0111\u1ea7u n\u1ed1i s\u1ee3i quang<\/p><\/li><li><p>Chu\u1ea9n h\u00f3a c\u00e1c m\u00f4-\u0111un SFP \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn<\/p><\/li><li><p>Gi\u1ea3m vi\u1ec7c s\u1eed d\u1ee5ng thi\u1ebft b\u1ecb quang h\u1ecdc c\u1ee7a nhi\u1ec1u nh\u00e0 cung c\u1ea5p kh\u00f4ng \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c m\u00f4i tr\u01b0\u1eddng m\u1eadt \u0111\u1ed9 cao 25G v\u00e0 100G, b\u1ea3o tr\u00ec quang h\u1ecdc ch\u1ee7 \u0111\u1ed9ng c\u00f3 th\u1ec3 gi\u1ea3m \u0111\u00e1ng k\u1ec3 s\u1ef1 c\u1ed1 v\u00e0 s\u1ef1 ki\u1ec7n truy\u1ec1n l\u1ea1i li\u00ean quan \u0111\u1ebfn CRC.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udfe8 C\u00e1ch ng\u0103n ng\u1eeba l\u1ed7i CRC trong m\u1ea1ng t\u1ed1c \u0111\u1ed9 cao<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1ch t\u1ed1t nh\u1ea5t \u0111\u1ec3 ng\u0103n ng\u1eeba l\u1ed7i CRC l\u00e0 duy tr\u00ec ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u \u1edf t\u1ea7ng v\u1eadt l\u00fd \u1ed5n \u0111\u1ecbnh tr\u00ean to\u00e0n b\u1ed9 li\u00ean k\u1ebft Ethernet. Trong c\u00e1c m\u1ea1ng t\u1ed1c \u0111\u1ed9 cao 10G, 25G, 100G v\u00e0 400G, c\u00e1c v\u1ea5n \u0111\u1ec1 CRC th\u01b0\u1eddng \u0111\u01b0\u1ee3c ng\u0103n ch\u1eb7n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c m\u00f4-\u0111un SFP\/QSFP t\u01b0\u01a1ng th\u00edch, gi\u1eef \u0111\u1ea7u n\u1ed1i s\u1ee3i quang s\u1ea1ch s\u1ebd, ki\u1ec3m so\u00e1t t\u1ed5n hao quang, gi\u00e1m s\u00e1t b\u1ed9 \u0111\u1ebfm CRC tr\u00ean giao di\u1ec7n, \u0111\u1ed3ng th\u1eddi chu\u1ea9n h\u00f3a vi\u1ec7c tri\u1ec3n khai c\u00e1p v\u00e0 b\u1ed9 thu ph\u00e1t quang. B\u1ea3o tr\u00ec ph\u00f2ng ng\u1eeba hi\u1ec7u qu\u1ea3 h\u01a1n nhi\u1ec1u so v\u1edbi vi\u1ec7c kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 m\u1ea5t m\u00e1t g\u00f3i l\u1eb7p l\u1ea1i sau khi s\u1ef1 c\u1ed1 x\u1ea3y ra.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3fef055439ef45a789f090869021f42b.jpg\" alt=\"How to Prevent CRC Errors in High-Speed Networks\" class=\"wp-image-7287\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3fef055439ef45a789f090869021f42b.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3fef055439ef45a789f090869021f42b-300x169.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3fef055439ef45a789f090869021f42b-1024x576.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3fef055439ef45a789f090869021f42b-768x432.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3fef055439ef45a789f090869021f42b-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Ph\u1ea7n l\u1edbn c\u00e1c l\u1ed7i CRC l\u1eb7p l\u1ea1i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ng\u0103n ng\u1eeba th\u00f4ng qua c\u00e1c th\u1ef1c h\u00e0nh \u0111\u00fang v\u1ec1 quang h\u1ecdc v\u00e0 c\u00e1p.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >S\u1eed d\u1ee5ng c\u00e1c m\u00f4-\u0111un quang h\u1ecdc v\u00e0 c\u00e1p t\u01b0\u01a1ng th\u00edch<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t trong nh\u1eefng nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn nh\u1ea5t g\u00e2y ra l\u1ed7i CRC l\u00e0 ph\u1ea7n c\u1ee9ng quang kh\u00f4ng t\u01b0\u01a1ng th\u00edch ho\u1eb7c ch\u1ea5t l\u01b0\u1ee3ng th\u1ea5p.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lu\u00f4n x\u00e1c minh:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>T\u01b0\u01a1ng th\u00edch SFP\/SFP+<\/p><\/li><li><p>Lo\u1ea1i s\u1ee3i quang (SMF ho\u1eb7c MMF)<\/p><\/li><li><p>Ph\u00f9 h\u1ee3p b\u01b0\u1edbc s\u00f3ng<\/p><\/li><li><p><p>Fiber type<\/p><\/p><\/li><li><p>H\u1ed7 tr\u1ee3 ti\u00eau chu\u1ea9n Ethernet<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 218px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"218\"><p>Ti\u00eau chu\u1ea9n quang h\u1ecdc<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Lo\u1ea1i s\u1ee3i<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Kho\u1ea3ng c\u00e1ch \u0111i\u1ec3n h\u00ecnh<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"218\"><p>10GBASE-SR<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>C\u00e1p quang \u0111a mode (MMF)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>L\u00ean \u0111\u1ebfn 300 m<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"218\"><p>10GBASE-LR<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>C\u00e1p quang \u0111\u01a1n mode (SMF)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u0110\u1ebfn 10 km<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"218\"><p><a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/473141.htm\">25GBASE-LR<\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>MMF<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>T\u1ed1i \u0111a 100 m<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"218\"><p>100G<br> <a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/488423.htm\">QSFP28 LR4<\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>SMF<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u0110\u1ebfn 10 km<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb quang h\u1ecdc kh\u00f4ng \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 ho\u1eb7c c\u00e1c lo\u1ea1i c\u00e1p quang kh\u00f4ng \u0111\u00fang c\u00f3 th\u1ec3 g\u00e2y ra l\u1ed7i CRC v\u00e0 FCS kh\u00f4ng \u1ed5n \u0111\u1ecbnh, ngay c\u1ea3 khi li\u00ean k\u1ebft v\u1eabn ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Gi\u1eef s\u1ea1ch b\u1ec1 m\u1eb7t \u0111\u1ea7u n\u1ed1i s\u1ee3i quang<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ea7u n\u1ed1i quang b\u1ea9n l\u00e0 m\u1ed9t trong nh\u1eefng nguy\u00ean nh\u00e2n h\u00e0ng \u0111\u1ea7u g\u00e2y ra l\u1ed7i CRC trong trung t\u00e2m d\u1eef li\u1ec7u.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nhi\u1ec5m b\u1ea9n c\u00f3 th\u1ec3 bao g\u1ed3m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>C\u00e1c h\u1ea1t b\u1ee5i<\/p><\/li><li><p>D\u1ea7u t\u1eeb ng\u00f3n tay<\/p><\/li><li><p>D\u01b0 l\u01b0\u1ee3ng ch\u1ea5t l\u00e0m s\u1ea1ch<\/p><\/li><li><p>M\u1ea3nh v\u1ee5n l\u01a1 l\u1eedng trong kh\u00f4ng kh\u00ed<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ngay c\u1ea3 nhi\u1ec5m b\u1ea9n \u1edf c\u1ea5p \u0111\u1ed9 vi m\u00f4 c\u0169ng c\u00f3 th\u1ec3:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>L\u00e0m t\u0103ng t\u1ed5n hao ch\u00e8n<\/p><\/li><li><p>Gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u quang<\/p><\/li><li><p>L\u00e0m t\u0103ng T\u1ef7 l\u1ec7 l\u1ed7i bit (BER)<\/p><\/li><li><p>G\u00e2y ra l\u1ed7i h\u1ecfng khung CRC<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra v\u00e0 l\u00e0m s\u1ea1ch:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>\u0110\u1ea7u n\u1ed1i LC<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/understanding-polarity-in-mtp-mpo-system-for-signal-integrity\/\">MPO\/MTP<\/a> c\u00e1c giao di\u1ec7n<\/p><\/li><li><p>C\u00e1c b\u1ea3ng \u0111\u1ea5u n\u1ed1i (patch panels)<\/p><\/li><li><p>D\u00e2y nh\u1ea3y quang<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">tr\u01b0\u1edbc khi l\u1eafp \u0111\u1eb7t v\u00e0 trong c\u00e1c chu k\u1ef3 b\u1ea3o tr\u00ec.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Gi\u00e1m s\u00e1t b\u1ed9 \u0111\u1ebfm CRC tr\u01b0\u1edbc khi x\u1ea3y ra s\u1ef1 c\u1ed1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c \u0111\u1ed9i m\u1ea1ng gi\u00e0u kinh nghi\u1ec7m kh\u00f4ng ch\u1edd \u0111\u1ebfn khi x\u1ea3y ra gi\u00e1n \u0111o\u1ea1n m\u1edbi ki\u1ec3m tra th\u1ed1ng k\u00ea CRC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c switch hi\u1ec7n \u0111\u1ea1i c\u1ee7a Cisco, Juniper Networks v\u00e0 Arista Networks h\u1ed7 tr\u1ee3 gi\u00e1m s\u00e1t li\u00ean t\u1ee5c giao di\u1ec7n \u0111\u1ec3 theo d\u00f5i:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>L\u1ed7i CRC<\/p><\/li><li><p>L\u1ed7i FCS<\/p><\/li><li><p>M\u1ea5t g\u00f3i tin<\/p><\/li><li><p>Xu h\u01b0\u1edbng BER<\/p><\/li><li><p>C\u00e1c th\u00f4ng s\u1ed1 DOM quang h\u1ecdc<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u0110\u1ecbnh ngh\u0129a vi m\u00f4<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>B\u1ed9 \u0111\u1ebfm l\u1ed7i CRC:<\/strong> Theo d\u00f5i s\u1ed1 l\u01b0\u1ee3ng khung Ethernet b\u1ecb l\u1ed7i ph\u00e1t hi\u1ec7n tr\u00ean m\u1ed9t giao di\u1ec7n.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ed9 \u0111\u1ebfm CRC t\u0103ng d\u1ea7n ch\u1eadm th\u01b0\u1eddng cho th\u1ea5y:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Suy gi\u1ea3m quang h\u1ecdc giai \u0111o\u1ea1n \u0111\u1ea7u<\/p><\/li><li><p>L\u00e3o h\u00f3a c\u00e1p<\/p><\/li><li><p>S\u1ef1 b\u1ea5t \u1ed5n c\u1ee7a c\u1ed5ng<\/p><\/li><li><p>Bi\u00ean d\u1ef1 ph\u00f2ng t\u00edn hi\u1ec7u y\u1ebfu<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ph\u00e1t hi\u1ec7n s\u1edbm c\u00e1c xu h\u01b0\u1edbng n\u00e0y gi\u00fap ng\u0103n ng\u1eeba s\u1ef1 c\u1ed1 m\u1ea1ng quy m\u00f4 l\u1edbn.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Ki\u1ec3m so\u00e1t t\u1ed5n hao quang v\u00e0 ng\u00e2n s\u00e1ch li\u00ean k\u1ebft<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c li\u00ean k\u1ebft Ethernet t\u1ed1c \u0111\u1ed9 cao c\u00f3 y\u00eau c\u1ea7u nghi\u00eam ng\u1eb7t v\u1ec1 c\u00f4ng su\u1ea5t quang.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 truy\u1ec1n d\u1eabn \u1ed5n \u0111\u1ecbnh:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>T\u1ed5ng t\u1ed5n hao ch\u00e8n ph\u1ea3i n\u1eb1m trong gi\u1edbi h\u1ea1n \u0111\u1eb7c t\u1ea3<\/p><\/li><li><p>C\u1ea7n gi\u1ea3m thi\u1ec3u u\u1ed1n cong s\u1ee3i quang<\/p><\/li><li><p>C\u1ea7n ki\u1ec3m so\u00e1t t\u1ed5n hao t\u1ea1i b\u1ea3ng \u0111\u1ea5u n\u1ed1i (patch panel)<\/p><\/li><li><p>C\u1ea7n gi\u1ea3m ph\u1ea3n x\u1ea1 t\u1ea1i \u0111\u1ea7u n\u1ed1i<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Trong m\u00f4i tr\u01b0\u1eddng Ethernet 25G v\u00e0 100G, vi\u1ec7c m\u1ea5t \u0111i m\u1ed9t bi\u00ean d\u1ef1 ph\u00f2ng quang nh\u1ecf c\u0169ng c\u00f3 th\u1ec3 l\u00e0m t\u0103ng \u0111\u00e1ng k\u1ec3 l\u1ed7i CRC.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Chu\u1ea9n h\u00f3a c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng tr\u00ean to\u00e0n m\u1ea1ng<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c tri\u1ec3n khai \u0111a nh\u00e0 cung c\u1ea5p \u0111\u00f4i khi t\u1ea1o ra c\u00e1c v\u1ea5n \u0111\u1ec1 t\u01b0\u01a1ng th\u00edch, l\u00e0m t\u0103ng t\u00ednh b\u1ea5t \u1ed5n c\u1ee7a l\u1ed7i CRC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nhi\u1ec1u nh\u00e0 v\u1eadn h\u00e0nh doanh nghi\u1ec7p gi\u1ea3m c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn CRC b\u1eb1ng c\u00e1ch chu\u1ea9n h\u00f3a:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>c\u1ee7a b\u00ean th\u1ee9 ba \u0111\u00e1ng tin c\u1eady nh\u01b0 th\u1ebf n\u00e0o?<\/p><\/li><li><p>C\u00e1c lo\u1ea1i c\u00e1p DAC<\/p><\/li><li><p>C\u01a1 s\u1edf h\u1ea1 t\u1ea7ng c\u00e1p quang<\/p><\/li><li><p>C\u00e1c phi\u00ean b\u1ea3n firmware switch<\/p><\/li><li><p>C\u00e1c ch\u00ednh s\u00e1ch gi\u00e1m s\u00e1t quang h\u1ecdc<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c c\u1ee5m AI m\u1eadt \u0111\u1ed9 cao, trung t\u00e2m d\u1eef li\u1ec7u \u0111\u00e1m m\u00e2y v\u00e0 m\u00f4i tr\u01b0\u1eddng vi\u1ec5n th\u00f4ng, vi\u1ec7c ph\u00f2ng ng\u1eeba CRC ch\u1ee7 \u0111\u1ed9ng \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a k\u1ef9 thu\u1eadt \u0111\u1ed9 tin c\u1eady m\u1ea1ng d\u00e0i h\u1ea1n ch\u1ee9 kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udfe8 C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 l\u1ed7i CRC<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/0206ba3ba89843bc8c16058db0a4e13b.jpg\" alt=\"FAQ About CRC Errors\" class=\"wp-image-7288\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/0206ba3ba89843bc8c16058db0a4e13b.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/0206ba3ba89843bc8c16058db0a4e13b-300x169.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/0206ba3ba89843bc8c16058db0a4e13b-1024x576.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/0206ba3ba89843bc8c16058db0a4e13b-768x432.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/0206ba3ba89843bc8c16058db0a4e13b-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >C1: T\u1ea1i sao t\u00f4i \u0111\u1ed9t nhi\u00ean th\u1ea5y xu\u1ea5t hi\u1ec7n l\u1ed7i CRC tr\u00ean c\u1ed5ng chuy\u1ec3n m\u1ea1ch c\u1ee7a m\u00ecnh?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ed7i CRC th\u01b0\u1eddng c\u00f3 ngh\u0129a l\u00e0 b\u1ed9 chuy\u1ec3n m\u1ea1ch \u0111ang nh\u1eadn c\u00e1c khung Ethernet b\u1ecb h\u1ecfng. Trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn t\u1ea7ng v\u1eadt l\u00fd, ch\u1eb3ng h\u1ea1n nh\u01b0 \u0111\u1ea7u n\u1ed1i s\u1ee3i quang b\u1ea9n, c\u00e1p b\u1ecb h\u01b0 h\u1ea1i, m\u00f4-\u0111un SFP kh\u00f4ng \u1ed5n \u0111\u1ecbnh ho\u1eb7c suy hao t\u00edn hi\u1ec7u.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c m\u1ea1ng doanh nghi\u1ec7p, vi\u1ec7c t\u0103ng d\u1ea7n b\u1ed9 \u0111\u1ebfm CRC th\u01b0\u1eddng l\u00e0 d\u1ea5u hi\u1ec7u c\u1ea3nh b\u00e1o s\u1edbm v\u1ec1 s\u1ef1 suy gi\u1ea3m li\u00ean k\u1ebft tr\u01b0\u1edbc khi m\u1ea5t g\u00f3i tr\u1edf n\u00ean r\u00f5 r\u1ec7t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t l\u1ed7i CRC th\u01b0\u1eddng ch\u1ec9 ra v\u1ea5n \u0111\u1ec1 truy\u1ec1n d\u1eabn, ch\u1ee9 kh\u00f4ng ph\u1ea3i v\u1ea5n \u0111\u1ec1 ph\u1ea7n m\u1ec1m.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >C2: CRC c\u00f3 t\u1ed1t h\u01a1n ki\u1ec3m tra t\u1ed5ng (checksum) trong vi\u1ec7c ph\u00e1t hi\u1ec7n l\u1ed7i m\u1ea1ng kh\u00f4ng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00f3. CRC \u0111\u00e1ng tin c\u1eady h\u01a1n ki\u1ec3m tra t\u1ed5ng truy\u1ec1n th\u1ed1ng v\u00ec n\u00f3 c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c m\u1eabu sai l\u1ec7ch truy\u1ec1n d\u1eabn ph\u1ee9c t\u1ea1p h\u01a1n, bao g\u1ed3m c\u1ea3 l\u1ed7i ch\u00f9m (burst errors) th\u01b0\u1eddng g\u1eb7p trong m\u1ea1ng Ethernet v\u00e0 quang h\u1ecdc.<\/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>C\u00f4ng ngh\u1ec7<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Kh\u1ea3 n\u0103ng ph\u00e1t hi\u1ec7n<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>\u1ee8ng d\u1ee5ng ph\u1ed5 bi\u1ebfn<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Ki\u1ec3m tra t\u1ed5ng<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Basic<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>T\u1ec7p tin, giao th\u1ee9c \u0111\u01a1n gi\u1ea3n<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>CRC<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>N\u00e2ng cao<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ethernet, m\u1ea1ng SFP<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>ECC<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ph\u00e1t hi\u1ec7n + s\u1eeda l\u1ed7i<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>B\u1ed9 nh\u1edb, l\u01b0u tr\u1eef<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 l\u00fd do c\u00e1c ti\u00eau chu\u1ea9n Ethernet hi\u1ec7n \u0111\u1ea1i s\u1eed d\u1ee5ng x\u00e1c th\u1ef1c D\u00e3y Ki\u1ec3m tra Khung (FCS) d\u1ef1a tr\u00ean CRC.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >C3: M\u00f4-\u0111un SFP k\u00e9m ch\u1ea5t l\u01b0\u1ee3ng c\u00f3 th\u1ec3 g\u00e2y ra l\u1ed7i CRC kh\u00f4ng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00f3. C\u00e1c m\u00f4-\u0111un SFP\/SFP+ kh\u00f4ng \u1ed5n \u0111\u1ecbnh ho\u1eb7c kh\u00f4ng t\u01b0\u01a1ng th\u00edch l\u00e0 nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn g\u00e2y l\u1ed7i CRC trong m\u1ea1ng s\u1ee3i quang.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c nguy\u00ean nh\u00e2n \u0111i\u1ec3n h\u00ecnh bao g\u1ed3m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>\u0110\u1ea7u n\u1ed1i LC b\u1ecb b\u1ea9n<\/p><\/li><li><p>Ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u quang k\u00e9m<\/p><\/li><li><p>Thi\u1ebft b\u1ecb quang kh\u00f4ng \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3<\/p><\/li><li><p>C\u00e1p DAC ch\u1ea5t l\u01b0\u1ee3ng th\u1ea5p<\/p><\/li><li><p>B\u1ed9 thu ph\u00e1t b\u1ecb qu\u00e1 nhi\u1ec7t<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u1ede t\u1ed1c \u0111\u1ed9 Ethernet 10G, 25G v\u00e0 100G, ngay c\u1ea3 nh\u1eefng v\u1ea5n \u0111\u1ec1 nh\u1ecf v\u1ec1 ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u c\u0169ng c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng g\u00f3i tin.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >C4: T\u1ea1i sao l\u1ed7i CRC x\u1ea3y ra th\u01b0\u1eddng xuy\u00ean h\u01a1n trong m\u1ea1ng 25G v\u00e0 100G?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c li\u00ean k\u1ebft Ethernet t\u1ed1c \u0111\u1ed9 cao c\u00f3 bi\u00ean \u0111\u1ed9 dung sai t\u00edn hi\u1ec7u nh\u1ecf h\u01a1n nhi\u1ec1u.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong m\u00f4i tr\u01b0\u1eddng SFP28 25G v\u00e0 QSFP28 100G, t\u1ed5n th\u1ea5t quang nh\u1ecf, nhi\u1ec5m b\u1ea9n \u0111\u1ea7u n\u1ed1i ho\u1eb7c t\u1ed5n th\u1ea5t ch\u00e8n (insertion loss) c\u00f3 th\u1ec3 nhanh ch\u00f3ng l\u00e0m t\u0103ng T\u1ef7 l\u1ec7 l\u1ed7i bit (BER), d\u1eabn \u0111\u1ebfn l\u1ed7i khung CRC.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>T\u1ed1c \u0111\u1ed9 m\u1ea1ng cao h\u01a1n \u0111\u00f2i h\u1ecfi c\u00e1c li\u00ean k\u1ebft v\u1eadt l\u00fd s\u1ea1ch h\u01a1n v\u00e0 \u1ed5n \u0111\u1ecbnh h\u01a1n.<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" >C5: L\u1ed7i CRC c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm m\u1ea1ng ngay c\u1ea3 khi li\u00ean k\u1ebft v\u1eabn ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00e2ng. M\u1ed9t li\u00ean k\u1ebft c\u00f3 th\u1ec3 v\u1eabn ho\u1ea1t \u0111\u1ed9ng trong khi c\u00e1c khung b\u1ecb l\u1ed7i li\u00ean t\u1ee5c b\u1ecb lo\u1ea1i b\u1ecf v\u00e0 truy\u1ec1n l\u1ea1i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 g\u00e2y ra:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>\u0110\u1ed9 tr\u1ec5 cao h\u01a1n<\/p><\/li><li><p>Th\u00f4ng l\u01b0\u1ee3ng gi\u1ea3m<\/p><\/li><li><p>Vi\u1ec7c truy\u1ec1n l\u1ea1i TCP<\/p><\/li><li><p>\u1ee8ng d\u1ee5ng m\u1ea5t \u1ed5n \u0111\u1ecbnh<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, ng\u01b0\u1eddi d\u00f9ng nh\u1eadn th\u1ea5y \u201chi\u1ec7u su\u1ea5t m\u1ea1ng ch\u1eadm\u201d tr\u01b0\u1edbc khi giao di\u1ec7n th\u1ef1c s\u1ef1 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >C\u00e2u h\u1ecfi 6: Ph\u01b0\u01a1ng ph\u00e1p nhanh nh\u1ea5t \u0111\u1ec3 kh\u1eafc ph\u1ee5c l\u1ed7i CRC tr\u00ean \u0111\u01b0\u1eddng truy\u1ec1n s\u1ee3i quang l\u00e0 g\u00ec?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">H\u1ea7u h\u1ebft k\u1ef9 s\u01b0 ch\u1ea9n \u0111o\u00e1n l\u1ed7i CRC theo th\u1ee9 t\u1ef1 sau \u0111\u00e2y:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 219px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"219\"><p>\u0110\u1ed9 \u01b0u ti\u00ean<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>H\u00e0nh \u0111\u1ed9ng \u0111\u1ec1 xu\u1ea5t<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"219\"><p>1<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>L\u00e0m s\u1ea1ch c\u00e1c \u0111\u1ea7u n\u1ed1i s\u1ee3i quang<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"219\"><p>2<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Thay c\u00e1p n\u1ed1i<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"219\"><p>3<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ho\u00e1n \u0111\u1ed5i module SFP<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"219\"><p>4<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ki\u1ec3m tra m\u1ee9c c\u00f4ng su\u1ea5t quang<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"219\"><p>5<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ki\u1ec3m tra c\u1ed5ng switch kh\u00e1c<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1ch ti\u1ebfp c\u1eadn \u01b0u ti\u00ean l\u1edbp v\u1eadt l\u00fd n\u00e0y gi\u1ea3i quy\u1ebft ph\u1ea7n l\u1edbn c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn l\u1ed7i CRC trong m\u1ea1ng Ethernet v\u00e0 m\u1ea1ng SFP.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udfe8 K\u1ebft lu\u1eadn: V\u00ec sao vi\u1ec7c gi\u00e1m s\u00e1t CRC l\u1ea1i quan tr\u1ecdng trong c\u00e1c m\u1ea1ng Ethernet v\u00e0 SFP hi\u1ec7n \u0111\u1ea1i<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">CRC (Ki\u1ec3m tra d\u01b0 v\u00f2ng \u2013 Cyclic Redundancy Check) l\u00e0 m\u1ed9t trong nh\u1eefng c\u01a1 ch\u1ebf quan tr\u1ecdng nh\u1ea5t nh\u1eb1m b\u1ea3o v\u1ec7 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u trong giao ti\u1ebfp Ethernet hi\u1ec7n \u0111\u1ea1i. D\u00f9 trong c\u00e1c switch doanh nghi\u1ec7p, m\u1ea1ng c\u00f4ng nghi\u1ec7p, c\u1ee5m AI hay c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng s\u1ee3i quang t\u1ed1c \u0111\u1ed9 cao, CRC \u0111\u1ec1u gi\u00fap ph\u00e1t hi\u1ec7n c\u00e1c g\u00f3i tin b\u1ecb l\u1ed7i tr\u01b0\u1edbc khi ch\u00fang \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u1ee9ng d\u1ee5ng, h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef ho\u1eb7c \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh c\u1ee7a m\u1ea1ng.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/2766fa34efb2466db9faf2fda19e1140.jpg\" alt=\"Why CRC Monitoring Matters in Modern Ethernet and SFP Networks\" class=\"wp-image-7289\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/2766fa34efb2466db9faf2fda19e1140.jpg 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/2766fa34efb2466db9faf2fda19e1140-300x169.jpg 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/2766fa34efb2466db9faf2fda19e1140-1024x576.jpg 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/2766fa34efb2466db9faf2fda19e1140-768x432.jpg 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/2766fa34efb2466db9faf2fda19e1140-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c tri\u1ec3n khai th\u1ef1c t\u1ebf, c\u00e1c l\u1ed7i CRC l\u1eb7p \u0111i l\u1eb7p l\u1ea1i hi\u1ebfm khi x\u1ea3y ra ng\u1eabu nhi\u00ean. Ch\u00fang th\u01b0\u1eddng l\u00e0 d\u1ea5u hi\u1ec7u ban \u0111\u1ea7u c\u1ee7a:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u k\u00e9m<\/p><\/li><li><p>\u0110\u1ea7u n\u1ed1i c\u00e1p quang b\u1ea9n<\/p><\/li><li><p>C\u00e1p b\u1ecb h\u01b0 h\u1ecfng<\/p><\/li><li><p>Su suy hao quang h\u1ecdc<\/p><\/li><li><p>C\u00e1c c\u1ed5ng switch kh\u00f4ng \u1ed5n \u0111\u1ecbnh<\/p><\/li><li><p>M\u00f4-\u0111un SFP kh\u00f4ng t\u01b0\u01a1ng th\u00edch<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Khi m\u1ea1ng ti\u1ebfp t\u1ee5c ti\u1ebfn t\u1edbi c\u00e1c chu\u1ea9n Ethernet 25G, 100G v\u00e0 400G, vi\u1ec7c duy tr\u00ec hi\u1ec7u su\u1ea5t \u1ed5n \u0111\u1ecbnh \u1edf l\u1edbp v\u1eadt l\u00fd ng\u00e0y c\u00e0ng tr\u1edf n\u00ean quan tr\u1ecdng. Vi\u1ec7c gi\u00e1m s\u00e1t CRC ch\u1ee7 \u0111\u1ed9ng, b\u1ea3o tr\u00ec quang h\u1ecdc \u0111\u00fang c\u00e1ch v\u00e0 \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch \u0111\u00e1ng tin c\u1eady gi\u1eefa c\u00e1c b\u1ed9 thu ph\u00e1t (transceiver) hi\u1ec7n \u0111\u00e3 tr\u1edf th\u00e0nh nh\u1eefng y\u1ebfu t\u1ed1 thi\u1ebft y\u1ebfu trong v\u1eadn h\u00e0nh m\u1ea1ng trung t\u00e2m d\u1eef li\u1ec7u v\u00e0 vi\u1ec5n th\u00f4ng.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>C\u00e1c k\u1ebft n\u1ed1i quang \u1ed5n \u0111\u1ecbnh mang l\u1ea1i hi\u1ec7u su\u1ea5t CRC \u1ed5n \u0111\u1ecbnh.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi c\u00e1c doanh nghi\u1ec7p x\u00e2y d\u1ef1ng c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng Ethernet s\u1ee3i quang \u0111\u00e1ng tin c\u1eady, vi\u1ec7c l\u1ef1a ch\u1ecdn c\u00e1c b\u1ed9 thu ph\u00e1t quang ch\u1ea5t l\u01b0\u1ee3ng cao v\u00e0 ho\u00e0n to\u00e0n t\u01b0\u01a1ng th\u00edch l\u00e0 m\u1ed9t trong nh\u1eefng c\u00e1ch hi\u1ec7u qu\u1ea3 nh\u1ea5t \u0111\u1ec3 gi\u1ea3m thi\u1ec3u c\u00e1c s\u1ef1 c\u1ed1 m\u1ea1ng li\u00ean quan \u0111\u1ebfn l\u1ed7i CRC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00e1m ph\u00e1 c\u00e1c b\u1ed9 thu ph\u00e1t quang SFP, SFP+, SFP28 v\u00e0 QSFP c\u1ea5p doanh nghi\u1ec7p t\u1ea1i <a target=\"_self\" href=\"https:\/\/www.l-p.com\/\">C\u1eeda h\u00e0ng Ch\u00ednh th\u1ee9c LINK-PP<\/a> \u0111\u1ec3 c\u00f3 k\u1ebft n\u1ed1i Ethernet \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u n\u0103ng cao.<\/p>","protected":false},"excerpt":{"rendered":"<p>T\u00ecm hi\u1ec3u CRC l\u00e0 g\u00ec, c\u00e1ch c\u00e1c l\u1ed7i ki\u1ec3m tra d\u01b0 v\u00f2ng ph\u00e1t sinh, c\u00e1ch kh\u1eafc ph\u1ee5c v\u00e0 l\u00fd do CRC quan tr\u1ecdng trong m\u1ea1ng, l\u01b0u tr\u1eef v\u00e0 m\u00f4-\u0111un SFP.<\/p>","protected":false},"author":1,"featured_media":7290,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[27],"tags":[26],"class_list":["post-7291","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\/7291","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=7291"}],"version-history":[{"count":6,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/7291\/revisions"}],"predecessor-version":[{"id":10687,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/7291\/revisions\/10687"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media\/7290"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media?parent=7291"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/categories?post=7291"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/tags?post=7291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}