{"id":5689,"date":"2025-07-24T00:00:00","date_gmt":"2025-07-24T00:00:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/1000base-sx-sfp-gigabit-ethernet-multimode-fiber-explained\/"},"modified":"2026-06-22T08:48:45","modified_gmt":"2026-06-22T08:48:45","slug":"1000base-sx-sfp-gigabit-ethernet-multimode-fiber-explained","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/1000base-sx-sfp-gigabit-ethernet-multimode-fiber-explained","title":{"rendered":"1000BASE-SX SFP l\u00e0 g\u00ec?"},"content":{"rendered":"
\"What<\/figure>\n\n\n\n

Gigabit Ethernet v\u1eabn l\u00e0 x\u01b0\u01a1ng s\u1ed1ng c\u1ee7a v\u00f4 s\u1ed1 m\u1ea1ng doanh nghi\u1ec7p v\u00e0 trung t\u00e2m d\u1eef li\u1ec7u. Khi tri\u1ec3n khai c\u00e1c li\u00ean k\u1ebft t\u1ed1c \u0111\u1ed9 cao tr\u00ean kho\u1ea3ng c\u00e1ch t\u01b0\u01a1ng \u0111\u1ed1i ng\u1eafn b\u1eb1ng s\u1ee3i quang \u0111a mode (MMF) chi ph\u00ed th\u1ea5p, <\/span>b\u1ed9 thu ph\u00e1t SFP 1000BASE-SX<\/strong><\/span><\/a> l\u00e0 thi\u1ebft b\u1ecb l\u00e0m vi\u1ec7c kh\u00f4ng th\u1ec3 thay th\u1ebf. Vi\u1ec7c hi\u1ec3u r\u00f5 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt, kh\u1ea3 n\u0103ng v\u00e0 c\u00e1c k\u1ecbch b\u1ea3n tri\u1ec3n khai t\u1ed1i \u01b0u c\u1ee7a n\u00f3 l\u00e0 \u0111i\u1ec1u thi\u1ebft y\u1ebfu \u0111\u1ed1i v\u1edbi k\u1ef9 s\u01b0 m\u1ea1ng v\u00e0 chuy\u00ean gia mua s\u1eafm CNTT.<\/span><\/p>\n\n\n\n

\u27a4 M\u00f4-\u0111un SFP 1000BASE-SX l\u00e0 g\u00ec?<\/strong><\/h2>\n\n\n\n

A SFP 1000BASE-SX<\/strong> (<\/span>S<\/strong><\/span>nh\u1ecf <\/span>F<\/strong><\/span>d\u1ea1ng <\/span>P<\/strong><\/span>(c\u00f3 th\u1ec3 c\u1eafm n\u00f3ng) l\u00e0 m\u00f4-\u0111un nh\u1ecf g\u1ecdn, c\u00f3 th\u1ec3 thay th\u1ebf n\u00f3ng, <\/span>m\u00f4-\u0111un quang<\/strong><\/span><\/a> \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho truy\u1ec1n th\u00f4ng Gigabit Ethernet (1000 Mbps). K\u00fd hi\u1ec7u \u201cSX\u201d ch\u1ec9 vi\u1ec7c s\u1eed d\u1ee5ng n\u00f3 v\u1edbi <\/span>laser b\u01b0\u1edbc s\u00f3ng ng\u1eafn<\/strong><\/span> (850 nm) tr\u00ean <\/span>c\u00e1p quang \u0111a mode<\/strong><\/span> (MMF)
<\/span><\/a>. C\u00e1c m\u00f4-\u0111un n\u00e0y chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u \u0111i\u1ec7n t\u1eeb b\u1ed9 chuy\u1ec3n m\u1ea1ch\/b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn m\u1ea1ng th\u00e0nh t\u00edn hi\u1ec7u quang \u0111\u1ec3 truy\u1ec1n qua c\u00e1p quang v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, cho ph\u00e9p thi\u1ebft l\u1eadp c\u00e1c k\u1ebft n\u1ed1i b\u0103ng th\u00f4ng r\u1ed9ng v\u00e0 \u0111\u1ed9 tr\u1ec5 th\u1ea5p.<\/span><\/p>\n\n\n\n

C\u00f4ng ngh\u1ec7 l\u00f5i & Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng<\/strong><\/p>\n\n\n\n

    \n

  1. Ngu\u1ed3n laser:<\/strong> S\u1eed d\u1ee5ng Laser ph\u00e1t x\u1ea1 b\u1ec1 m\u1eb7t h\u1ed1c \u0111\u1ee9ng (VCSEL)<\/a> ho\u1ea1t \u0111\u1ed9ng \u1edf b\u01b0\u1edbc s\u00f3ng 850 nm. VCSEL mang l\u1ea1i \u0111\u1ed9 tin c\u1eady cao, ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng th\u1ea5p h\u01a1n v\u00e0 chi ph\u00ed hi\u1ec7u qu\u1ea3 h\u01a1n so v\u1edbi laser Fabry-Perot.<\/p><\/li>

  2. Lo\u1ea1i c\u00e1p quang:<\/strong> \u0110\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t cho s\u1ee3i quang \u0111a mode (OM1, OM2, OM3, OM4)<\/strong><\/a>. \u0110\u01b0\u1eddng k\u00ednh l\u00f5i c\u1ee7a s\u1ee3i MMF (50 \u00b5m ho\u1eb7c 62,5 \u00b5m) cho ph\u00e9p nhi\u1ec1u \u0111\u01b0\u1eddng \u0111i c\u1ee7a \u00e1nh s\u00e1ng (c\u00e1c mode).<\/p><\/li>

  3. \u0110\u1ea7u n\u1ed1i LC duplex:<\/strong> Giao di\u1ec7n LC duplex ti\u00eau chu\u1ea9n c\u00f4ng nghi\u1ec7p \u0111\u1ea3m b\u1ea3o vi\u1ec7c \u0111i d\u00e2y d\u1ec5 d\u00e0ng.<\/p><\/li>

  4. M\u00e3 h\u00f3a:<\/strong> S\u1eed d\u1ee5ng m\u00e3 h\u00f3a \u0111\u01b0\u1eddng d\u00e2y 8B\/10B (t\u1ed1c \u0111\u1ed9 \u0111\u01b0\u1eddng d\u00e2y 1,25 Gbps cho d\u1eef li\u1ec7u 1 Gbps).<\/p><\/li>\n<\/ol>\n\n\n\n

    Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ch\u00ednh & Hi\u1ec7u n\u0103ng<\/strong><\/p>\n\n\n\n

    Vi\u1ec7c hi\u1ec3u r\u00f5 gi\u1edbi h\u1ea1n kho\u1ea3ng c\u00e1ch d\u1ef1a tr\u00ean lo\u1ea1i s\u1ee3i quang l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t \u0111\u1ec3 tri\u1ec3n khai th\u00e0nh c\u00f4ng:<\/p>\n\n\n\n

    \n\n<\/colgroup>

    Lo\u1ea1i s\u1ee3i<\/strong><\/p><\/th>

    \u0110\u01b0\u1eddng k\u00ednh l\u00f5i (\u00b5m)<\/strong><\/p><\/th>

    Kho\u1ea3ng c\u00e1ch t\u1ed1i \u0111a (SFP 1000BASE-SX)<\/strong><\/p><\/th><\/tr>

    OM1 (62,5 \u00b5m)<\/p><\/td>

    62.5<\/p><\/td>

    300 m\u00e9t<\/p><\/td><\/tr>

    OM2 (50 \u00b5m)<\/p><\/td>

    50<\/p><\/td>

    500 m\u00e9t<\/p><\/td><\/tr>

    OM3 (50 \u00b5m \u2013 T\u1ed1i \u01b0u h\u00f3a cho laser)<\/p><\/td>

    50<\/p><\/td>

    550 m\u00e9t<\/strong><\/p><\/td><\/tr>

    OM4 (50 \u00b5m \u2013 T\u1ed1i \u01b0u h\u00f3a cho laser)<\/p><\/td>

    50<\/p><\/td>

    Tr\u00ean 550 m\u00e9t<\/strong><\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n