{"id":477951,"date":"2023-08-09T09:22:45","date_gmt":"2023-08-09T09:22:45","guid":{"rendered":""},"modified":"2024-08-10T02:18:11","modified_gmt":"2024-08-10T02:18:11","slug":"manchester-encoding","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/manchester-encoding\/","title":{"rendered":"M\u00e3 h\u00f3a Manchester"},"content":{"rendered":"<p>M\u00e3 h\u00f3a Manchester l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong truy\u1ec1n d\u1eef li\u1ec7u s\u1ed1, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00e3 h\u00f3a hi\u1ec7u qu\u1ea3 d\u1eef li\u1ec7u nh\u1ecb ph\u00e2n th\u00e0nh t\u00edn hi\u1ec7u \u0111i\u1ec7n \u0111\u1ec3 truy\u1ec1n qua c\u00e1c k\u00eanh truy\u1ec1n th\u00f4ng. N\u00f3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady v\u00e0 ph\u00e1t hi\u1ec7n l\u1ed7i, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng trong c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau, bao g\u1ed3m m\u1ea1ng, vi\u1ec5n th\u00f4ng v\u00e0 h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a m\u00e3 h\u00f3a Manchester v\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3<\/h2>\n<p>Ngu\u1ed3n g\u1ed1c c\u1ee7a m\u00e3 h\u00f3a Manchester c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb \u0111\u1ea7u nh\u1eefng n\u0103m 1940 khi c\u00e1c nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n c\u1ee7a n\u00f3 l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn v\u00e0 tri\u1ec3n khai trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n b\u00e1o \u0111\u1ea7u ti\u00ean. Tuy nhi\u00ean, ph\u1ea3i \u0111\u1ebfn nh\u1eefng n\u0103m 1960, m\u00e3 h\u00f3a Manchester m\u1edbi tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn do \u0111\u01b0\u1ee3c tri\u1ec3n khai trong M\u00e1y t\u00ednh d\u1eabn \u0111\u01b0\u1eddng Apollo cho s\u1ee9 m\u1ec7nh h\u1ea1 c\u00e1nh l\u00ean m\u1eb7t tr\u0103ng l\u1ecbch s\u1eed v\u00e0o n\u0103m 1969. K\u1ef9 thu\u1eadt n\u00e0y \u0111\u01b0\u1ee3c NASA \u00e1p d\u1ee5ng nh\u1edd kh\u1ea3 n\u0103ng cung c\u1ea5p s\u1ef1 \u0111\u1ed3ng b\u1ed9 h\u00f3a ch\u00ednh x\u00e1c gi\u1eefa t\u00e0u v\u0169 tr\u1ee5 v\u00e0 Tr\u00e1i \u0111\u1ea5t. tr\u1ea1m m\u1eb7t \u0111\u1ea5t, \u0111\u1ea3m b\u1ea3o th\u00f4ng tin li\u00ean l\u1ea1c th\u00f4ng su\u1ed1t.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 m\u00e3 h\u00f3a Manchester: M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1<\/h2>\n<p>M\u00e3 h\u00f3a Manchester l\u00e0 m\u1ed9t lo\u1ea1i m\u00e3 h\u00f3a d\u00f2ng, bi\u1ebfn \u0111\u1ed5i m\u1ed9t chu\u1ed7i bit th\u00e0nh m\u1ed9t d\u1ea1ng bi\u1ec3u di\u1ec5n kh\u00e1c ph\u00f9 h\u1ee3p cho vi\u1ec7c truy\u1ec1n t\u1ea3i. \u0110\u00e2y l\u00e0 s\u01a1 \u0111\u1ed3 m\u00e3 h\u00f3a t\u1ef1 b\u1ea5m gi\u1edd, ngh\u0129a l\u00e0 n\u00f3 nh\u00fang th\u00f4ng tin \u0111\u1ed3ng h\u1ed3 v\u00e0o ch\u00ednh d\u1eef li\u1ec7u, \u0111\u1ea3m b\u1ea3o r\u1eb1ng ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn v\u1eabn \u0111\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 h\u00f3a.<\/p>\n<p>Qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a r\u1ea5t \u0111\u01a1n gi\u1ea3n. M\u1ed7i bit trong d\u1eef li\u1ec7u nh\u1ecb ph\u00e2n g\u1ed1c \u0111\u01b0\u1ee3c chia th\u00e0nh hai kho\u1ea3ng th\u1eddi gian b\u1eb1ng nhau, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 pha &#039;0&#039; v\u00e0 &#039;1&#039;. Trong pha &#039;0&#039;, t\u00edn hi\u1ec7u \u0111\u01b0\u1ee3c gi\u1eef \u1edf m\u1ee9c \u0111i\u1ec7n \u00e1p cao trong n\u1eeda \u0111\u1ea7u, ti\u1ebfp theo l\u00e0 m\u1ee9c \u0111i\u1ec7n \u00e1p th\u1ea5p trong n\u1eeda sau. Ng\u01b0\u1ee3c l\u1ea1i, \u1edf pha &#039;1&#039;, t\u00edn hi\u1ec7u duy tr\u00ec m\u1ee9c \u0111i\u1ec7n \u00e1p th\u1ea5p trong n\u1eeda \u0111\u1ea7u v\u00e0 m\u1ee9c \u0111i\u1ec7n \u00e1p cao trong n\u1eeda sau.<\/p>\n<p>\u01afu \u0111i\u1ec3m ch\u00ednh c\u1ee7a m\u00e3 h\u00f3a Manchester l\u00e0 kh\u1ea3 n\u0103ng cung c\u1ea5p s\u1ef1 chuy\u1ec3n \u0111\u1ed5i r\u00f5 r\u00e0ng cho t\u1eebng bit, khi\u1ebfn n\u00f3 \u00edt b\u1ecb l\u1ed7i do bi\u1ebfn d\u1ea1ng t\u00edn hi\u1ec7u v\u00e0 nhi\u1ec5u trong qu\u00e1 tr\u00ecnh truy\u1ec1n. Thu\u1ed9c t\u00ednh n\u00e0y \u0111\u1ea3m b\u1ea3o truy\u1ec1n d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady h\u01a1n, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong m\u00f4i tr\u01b0\u1eddng c\u00f3 \u0111\u1ed9 \u1ed3n cao.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a m\u00e3 h\u00f3a Manchester: C\u00e1ch m\u00e3 h\u00f3a Manchester ho\u1ea1t \u0111\u1ed9ng<\/h2>\n<p>M\u00e3 h\u00f3a Manchester ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch chia m\u1ed7i bit th\u00e0nh hai khe th\u1eddi gian v\u00e0 m\u00e3 h\u00f3a n\u00f3 d\u01b0\u1edbi d\u1ea1ng chuy\u1ec3n \u0111\u1ed5i trong khe th\u1eddi gian \u0111\u00f3. Vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i \u0111\u1ea3m b\u1ea3o r\u1eb1ng ng\u01b0\u1eddi nh\u1eadn c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c c\u1ea3 d\u1eef li\u1ec7u v\u00e0 th\u00f4ng tin v\u1ec1 th\u1eddi gian. S\u01a1 \u0111\u1ed3 d\u01b0\u1edbi \u0111\u00e2y minh h\u1ecda c\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a m\u00e3 h\u00f3a Manchester:<\/p>\n<div class=\"bg-black rounded-md mb-4\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md\"><span>yaml<\/span><button class=\"flex ml-auto gap-2\"><svg stroke=\"currentColor\" fill=\"none\" stroke-width=\"2\" viewbox=\"0 0 24 24\" stroke-linecap=\"round\" stroke-linejoin=\"round\" class=\"h-4 w-4\" height=\"1em\" width=\"1em\"><path d=\"M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2\"><\/path><rect x=\"8\" y=\"2\" width=\"8\" height=\"4\" rx=\"1\" ry=\"1\"><\/rect><\/svg>Sao ch\u00e9p m\u00e3<\/button><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs language-yaml\" data-no-translation=\"\"><span class=\"hljs-attr\">Bit value:<\/span>    <span class=\"hljs-number\">1<\/span>           <span class=\"hljs-number\">0<\/span><br \/>\n<span class=\"hljs-attr\">Time slots:<\/span> <span class=\"hljs-string\">|--- | ---|<\/span> <span class=\"hljs-string\">|--- | ---|<\/span><br \/>\n<span class=\"hljs-attr\">Encoding:<\/span>    <span class=\"hljs-string\">\/\u00af\u00af\u00af<\/span>   <span class=\"hljs-string\">_\/<\/span> <span class=\"hljs-string\">___\/<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<p>Nh\u01b0 \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb \u1edf tr\u00ean, logic &#039;1&#039; \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng c\u1ea1nh t\u0103ng \u1edf gi\u1eefa khe th\u1eddi gian, trong khi logic &#039;0&#039; \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng c\u1ea1nh xu\u1ed1ng \u1edf gi\u1eefa khe th\u1eddi gian. \u0110\u1eb7c \u0111i\u1ec3m \u0111\u1ed9c \u0111\u00e1o n\u00e0y l\u00e0m cho m\u00e3 h\u00f3a Manchester r\u1ea5t \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng \u0111\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u \u0111\u1ed3ng b\u1ed9 h\u00f3a ch\u00ednh x\u00e1c v\u00e0 ph\u00e1t hi\u1ec7n l\u1ed7i.<\/p>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a m\u00e3 h\u00f3a Manchester<\/h2>\n<p>M\u00e3 h\u00f3a Manchester cung c\u1ea5p m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng quan tr\u1ecdng khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn \u01b0u ti\u00ean \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u:<\/p>\n<ol>\n<li><strong>T\u1ef1 b\u1ea5m gi\u1edd<\/strong>: M\u00e3 h\u00f3a Manchester nh\u00fang th\u00f4ng tin \u0111\u1ed3ng h\u1ed3 v\u00e0o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i, \u0111\u1ea3m b\u1ea3o s\u1ef1 \u0111\u1ed3ng b\u1ed9 h\u00f3a \u0111\u00e1ng tin c\u1eady gi\u1eefa ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn.<\/li>\n<li><strong>Gi\u1ea3i m\u00e3 r\u00f5 r\u00e0ng<\/strong>: S\u1ef1 chuy\u1ec3n ti\u1ebfp r\u00f5 r\u00e0ng trong t\u1eebng khe th\u1eddi gian gi\u00fap ng\u01b0\u1eddi nh\u1eadn d\u1ec5 d\u00e0ng ph\u00e2n bi\u1ec7t gi\u1eefa &#039;0&#039; v\u00e0 &#039;1&#039;, gi\u1ea3m kh\u1ea3 n\u0103ng hi\u1ec3u sai.<\/li>\n<li><strong>Ph\u00e1t hi\u1ec7n l\u1ed7i<\/strong>: B\u1ea5t k\u1ef3 nhi\u1ec5u ho\u1eb7c bi\u1ebfn d\u1ea1ng t\u00edn hi\u1ec7u n\u00e0o trong qu\u00e1 tr\u00ecnh truy\u1ec1n \u0111\u1ec1u c\u00f3 kh\u1ea3 n\u0103ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u1ea3 hai n\u1eeda bit, d\u1eabn \u0111\u1ebfn l\u1ed7i \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p ph\u00e1t hi\u1ec7n l\u1ed7i v\u00e0 c\u00f3 th\u1ec3 nh\u1eafc nh\u1edf c\u00e1c giao th\u1ee9c truy\u1ec1n l\u1ea1i ho\u1eb7c s\u1eeda l\u1ed7i.<\/li>\n<li><strong>Bi\u1ec3u di\u1ec5n hai pha<\/strong>: M\u1ed7i bit \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng hai pha, \u0111\u1ea3m b\u1ea3o kho\u1ea3ng th\u1eddi gian b\u1eb1ng nhau cho c\u1ea3 &#039;0&#039; v\u00e0 &#039;1&#039;, d\u1eabn \u0111\u1ebfn m\u1ee9c ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng c\u00e2n b\u1eb1ng.<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i m\u00e3 h\u00f3a Manchester<\/h2>\n<p>C\u00f3 hai lo\u1ea1i m\u00e3 h\u00f3a Manchester ch\u00ednh:<\/p>\n<ol>\n<li><strong>M\u00e3 h\u00f3a vi sai Manchester (MDE)<\/strong>: Trong MDE, qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i \u1edf gi\u1eefa khe th\u1eddi gian bit bi\u1ec3u th\u1ecb m\u1ee9c logic &#039;1&#039;, trong khi vi\u1ec7c kh\u00f4ng c\u00f3 qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i bi\u1ec3u th\u1ecb m\u1ee9c logic &#039;0&#039;. Ki\u1ec3u m\u00e3 h\u00f3a n\u00e0y c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng nhi\u1ec5u t\u1ed1t h\u01a1n v\u00e0 c\u00f3 \u0111\u1eb7c t\u00ednh ph\u1ee5c h\u1ed3i xung nh\u1ecbp t\u1ed1t h\u01a1n.<\/li>\n<li><strong>Manchester Bi-Phase-L<\/strong>: Trong m\u00e3 h\u00f3a Bi-Phase-L, m\u1ed9t chuy\u1ec3n \u0111\u1ed5i \u1edf \u0111\u1ea7u khe th\u1eddi gian bit bi\u1ec3u th\u1ecb logic &#039;1&#039;, trong khi kh\u00f4ng c\u00f3 chuy\u1ec3n \u0111\u1ed5i n\u00e0o bi\u1ec3u th\u1ecb logic &#039;0&#039;. S\u01a1 \u0111\u1ed3 m\u00e3 h\u00f3a n\u00e0y mang l\u1ea1i l\u1ee3i th\u1ebf v\u1ec1 m\u1eb7t c\u00e2n b\u1eb1ng DC v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thi\u1ebft b\u1ecb l\u01b0u tr\u1eef t\u1eeb t\u00ednh.<\/li>\n<\/ol>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng so s\u00e1nh cho th\u1ea5y s\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh gi\u1eefa M\u00e3 h\u00f3a vi sai Manchester (MDE) v\u00e0 m\u00e3 h\u00f3a Manchester Bi-Phase-L:<\/p>\n<table>\n<thead>\n<tr>\n<th>T\u00ednh n\u0103ng<\/th>\n<th>M\u00e3 h\u00f3a vi sai Manchester (MDE)<\/th>\n<th>M\u00e3 h\u00f3a hai pha-L Manchester<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0110\u1ea1i di\u1ec7n c\u1ee7a &#039;1&#039;<\/td>\n<td>Chuy\u1ec3n ti\u1ebfp \u1edf gi\u1eefa khe th\u1eddi gian bit<\/td>\n<td>Chuy\u1ec3n \u0111\u1ed5i t\u1ea1i th\u1eddi \u0111i\u1ec3m b\u1eaft \u0111\u1ea7u khe th\u1eddi gian bit<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ea1i di\u1ec7n c\u1ee7a &#039;0&#039;<\/td>\n<td>S\u1ef1 v\u1eafng m\u1eb7t c\u1ee7a m\u1ed9t qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i<\/td>\n<td>Kh\u00f4ng chuy\u1ec3n ti\u1ebfp<\/td>\n<\/tr>\n<tr>\n<td>Kh\u1ea3 n\u0103ng ch\u1ed1ng \u1ed3n<\/td>\n<td>Ch\u1ecbu \u0111\u01b0\u1ee3c ti\u1ebfng \u1ed3n t\u1ed1t h\u01a1n<\/td>\n<td>Kh\u1ea3 n\u0103ng ch\u1ed1ng \u1ed3n v\u1eeba ph\u1ea3i<\/td>\n<\/tr>\n<tr>\n<td>C\u00e1c \u1ee9ng d\u1ee5ng<\/td>\n<td>Giao ti\u1ebfp Ethernet, LAN v\u00e0 WAN<\/td>\n<td>Thi\u1ebft b\u1ecb l\u01b0u tr\u1eef t\u1eeb t\u00ednh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng m\u00e3 h\u00f3a Manchester, c\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng<\/h2>\n<p>M\u00e3 h\u00f3a Manchester t\u00ecm th\u1ea5y c\u00e1c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n<ol>\n<li><strong>Ethernet<\/strong>: Vi\u1ec7c tri\u1ec3n khai Ethernet ban \u0111\u1ea7u s\u1eed d\u1ee5ng m\u00e3 h\u00f3a Manchester \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u qua c\u00e1p \u0111\u1ed3ng tr\u1ee5c. Tuy nhi\u00ean, c\u00e1c ti\u00eau chu\u1ea9n Ethernet hi\u1ec7n \u0111\u1ea1i \u0111\u00e3 chuy\u1ec3n sang c\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a ti\u00ean ti\u1ebfn h\u01a1n nh\u01b0 4B\/5B v\u00e0 8B\/10B \u0111\u1ec3 c\u00f3 t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u cao h\u01a1n.<\/li>\n<li><strong>Truy\u1ec1n th\u00f4ng kh\u00f4ng d\u00e2y<\/strong>: M\u00e3 h\u00f3a Manchester \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ed9t s\u1ed1 giao th\u1ee9c truy\u1ec1n th\u00f4ng kh\u00f4ng d\u00e2y \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 \u0111\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady gi\u1eefa ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn.<\/li>\n<\/ol>\n<p>B\u1ea5t ch\u1ea5p nh\u1eefng l\u1ee3i \u00edch c\u1ee7a n\u00f3, m\u00e3 h\u00f3a Manchester c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf v\u00e0 th\u00e1ch th\u1ee9c nh\u1ea5t \u0111\u1ecbnh:<\/p>\n<ul>\n<li><strong>B\u0103ng th\u00f4ng k\u00e9m hi\u1ec7u qu\u1ea3<\/strong>: M\u00e3 h\u00f3a Manchester y\u00eau c\u1ea7u b\u0103ng th\u00f4ng g\u1ea5p \u0111\u00f4i so v\u1edbi c\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a kh\u00e1c nh\u01b0 Non-Return-to-Zero (NRZ), khi\u1ebfn k\u1ef9 thu\u1eadt n\u00e0y \u00edt ph\u00f9 h\u1ee3p h\u01a1n cho vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u t\u1ed1c \u0111\u1ed9 cao.<\/li>\n<li><strong>S\u1ef1 ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng<\/strong>: Truy\u1ec1n hai l\u1ea7n chuy\u1ec3n \u0111\u1ed5i trong m\u00e3 h\u00f3a Manchester c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u0103ng m\u1ee9c ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c thi\u1ebft b\u1ecb ch\u1ea1y b\u1eb1ng pin.<\/li>\n<\/ul>\n<p>\u0110\u1ec3 gi\u1ea3i quy\u1ebft nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u kh\u00f4ng ng\u1eebng kh\u00e1m ph\u00e1 c\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a ti\u00ean ti\u1ebfn mang l\u1ea1i hi\u1ec7u qu\u1ea3 b\u0103ng th\u00f4ng \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n v\u00e0 m\u1ee9c ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng th\u1ea5p h\u01a1n trong khi v\u1eabn duy tr\u00ec \u0111\u1ed9 tin c\u1eady c\u1ee7a m\u00e3 h\u00f3a Manchester.<\/p>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<h3>M\u00e3 h\u00f3a Manchester so v\u1edbi Kh\u00f4ng quay tr\u1edf l\u1ea1i s\u1ed1 0 (NRZ)<\/h3>\n<table>\n<thead>\n<tr>\n<th>T\u00ednh n\u0103ng<\/th>\n<th>M\u00e3 h\u00f3a Manchester<\/th>\n<th>Kh\u00f4ng quay tr\u1edf v\u1ec1 s\u1ed1 0 (NRZ)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0110\u1ed3ng b\u1ed9 h\u00f3a \u0111\u1ed3ng h\u1ed3<\/td>\n<td>T\u1ef1 b\u1ea5m gi\u1edd<\/td>\n<td>Y\u00eau c\u1ea7u \u0111\u1ed3ng h\u1ed3 b\u00ean ngo\u00e0i<\/td>\n<\/tr>\n<tr>\n<td>M\u1eadt \u0111\u1ed9 chuy\u1ec3n ti\u1ebfp<\/td>\n<td>Cao<\/td>\n<td>Th\u1ea5p<\/td>\n<\/tr>\n<tr>\n<td>Hi\u1ec7u qu\u1ea3 b\u0103ng th\u00f4ng<\/td>\n<td>Th\u1ea5p h\u01a1n<\/td>\n<td>Cao h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td>Kh\u1ea3 n\u0103ng ph\u00e1t hi\u1ec7n l\u1ed7i<\/td>\n<td>Xu\u1ea5t s\u1eafc<\/td>\n<td>Gi\u1edbi h\u1ea1n<\/td>\n<\/tr>\n<tr>\n<td>S\u1ef1 ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng<\/td>\n<td>Cao h\u01a1n<\/td>\n<td>Th\u1ea5p h\u01a1n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn m\u00e3 h\u00f3a Manchester<\/h2>\n<p>Khi c\u00f4ng ngh\u1ec7 ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, m\u00e3 h\u00f3a Manchester c\u00f3 th\u1ec3 s\u1ebd c\u00f3 nh\u1eefng c\u1ea3i ti\u1ebfn v\u00e0 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u li\u00ean l\u1ea1c hi\u1ec7n \u0111\u1ea1i. M\u1ed9t s\u1ed1 ph\u00e1t tri\u1ec3n ti\u1ec1m n\u0103ng trong t\u01b0\u01a1ng lai bao g\u1ed3m:<\/p>\n<ol>\n<li><strong>Th\u00edch \u1ee9ng t\u1ed1c \u0111\u1ed9 cao<\/strong>: C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u00f3 th\u1ec3 ph\u00e1t tri\u1ec3n c\u00e1c bi\u1ebfn th\u1ec3 c\u1ee7a m\u00e3 h\u00f3a Manchester nh\u1eb1m gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 thi\u1ebfu hi\u1ec7u qu\u1ea3 v\u1ec1 b\u0103ng th\u00f4ng, khi\u1ebfn n\u00f3 ph\u00f9 h\u1ee3p h\u01a1n cho vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u t\u1ed1c \u0111\u1ed9 cao.<\/li>\n<li><strong>K\u1ef9 thu\u1eadt m\u00e3 h\u00f3a lai<\/strong>: K\u1ebft h\u1ee3p m\u00e3 h\u00f3a Manchester v\u1edbi c\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a d\u00f2ng kh\u00e1c c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c s\u01a1 \u0111\u1ed3 m\u00e3 h\u00f3a m\u1ea1nh m\u1ebd v\u00e0 linh ho\u1ea1t h\u01a1n.<\/li>\n<li><strong>Truy\u1ec1n th\u00f4ng quang h\u1ecdc<\/strong>: M\u00e3 h\u00f3a Manchester c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng quang h\u1ecdc nh\u1edd kh\u1ea3 n\u0103ng \u0111\u1ed3ng b\u1ed9 h\u00f3a c\u1ee7a n\u00f3, trong \u0111\u00f3 th\u1eddi gian ch\u00ednh x\u00e1c l\u00e0 r\u1ea5t quan tr\u1ecdng.<\/li>\n<\/ol>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi m\u00e3 h\u00f3a Manchester<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 internet, t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt, quy\u1ec1n ri\u00eang t\u01b0 v\u00e0 hi\u1ec7u su\u1ea5t. M\u1eb7c d\u00f9 m\u00e1y ch\u1ee7 proxy kh\u00f4ng li\u00ean k\u1ebft tr\u1ef1c ti\u1ebfp v\u1edbi m\u00e3 h\u00f3a Manchester nh\u01b0ng ch\u00fang c\u00f3 th\u1ec3 \u0111\u00f3ng vai tr\u00f2 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u trong m\u00f4i tr\u01b0\u1eddng m\u1ea1ng s\u1eed d\u1ee5ng m\u00e3 h\u00f3a Manchester.<\/p>\n<p>M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 tri\u1ec3n khai c\u01a1 ch\u1ebf l\u01b0u v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m, gi\u1ea3m nhu c\u1ea7u truy\u1ec1n d\u1eef li\u1ec7u l\u1eb7p \u0111i l\u1eb7p l\u1ea1i. B\u1eb1ng c\u00e1ch qu\u1ea3n l\u00fd hi\u1ec7u qu\u1ea3 c\u00e1c y\u00eau c\u1ea7u v\u00e0 ph\u1ea3n h\u1ed3i d\u1eef li\u1ec7u, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 gi\u1ea3m thi\u1ec3u kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u y\u00eau c\u1ea7u m\u00e3 h\u00f3a Manchester v\u00e0 truy\u1ec1n qua m\u1ea1ng, cu\u1ed1i c\u00f9ng d\u1eabn \u0111\u1ebfn c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 m\u1ea1ng.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 m\u00e3 h\u00f3a Manchester, b\u1ea1n c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Manchester_code\" target=\"_new\" rel=\"noopener nofollow\">Wikipedia: M\u00e3 Manchester<\/a><\/li>\n<li><a href=\"https:\/\/www.allaboutcircuits.com\/technical-articles\/manchester-encoding-what-is-it-and-why-use-it\/\" target=\"_new\" rel=\"noopener nofollow\">T\u1ea5t c\u1ea3 v\u1ec1 m\u1ea1ch \u0111i\u1ec7n: M\u00e3 h\u00f3a Manchester<\/a><\/li>\n<li><a href=\"https:\/\/scribd.com\/document\/366118106\/Differential-Manchester-encoding-doc\" target=\"_new\" rel=\"noopener nofollow\">M\u00e3 h\u00f3a Manchester kh\u00e1c bi\u1ec7t<\/a><\/li>\n<\/ul>\n<p>M\u00e3 h\u00f3a Manchester ti\u1ebfp t\u1ee5c l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt c\u01a1 b\u1ea3n trong truy\u1ec1n th\u00f4ng d\u1eef li\u1ec7u, cung c\u1ea5p kh\u1ea3 n\u0103ng \u0111\u1ed3ng b\u1ed9 h\u00f3a v\u00e0 ph\u00e1t hi\u1ec7n l\u1ed7i \u0111\u00e1ng tin c\u1eady. \u0110\u00f3ng g\u00f3p c\u1ee7a n\u00f3 cho c\u00e1c l\u0129nh v\u1ef1c kh\u00e1c nhau, bao g\u1ed3m m\u1ea1ng v\u00e0 vi\u1ec5n th\u00f4ng, l\u00e0 v\u00f4 gi\u00e1 v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng trong t\u01b0\u01a1ng lai c\u1ee7a n\u00f3 h\u1ee9a h\u1eb9n s\u1ebd ti\u1ebfp t\u1ee5c \u0111\u1ed5i m\u1edbi v\u00e0 t\u1ed1i \u01b0u h\u00f3a c\u00e1c c\u00f4ng ngh\u1ec7 truy\u1ec1n d\u1eef li\u1ec7u.<\/p>","protected":false},"featured_media":477952,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477951","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Manchester Encoding: Efficient Data Transmission Made Simple<\/mark>","faq_items":[{"question":"What is Manchester encoding?","answer":"Manchester encoding is a technique used in digital data transmission to efficiently encode binary data into electrical signals. It ensures reliable data synchronization and error detection, making it vital for various applications in networking, telecommunications, and computer systems."},{"question":"How did Manchester encoding originate?","answer":"The principles of Manchester encoding were first discussed in the early 1940s and gained popularity in the 1960s when it was implemented in the Apollo Guidance Computer for the historic moon landing mission in 1969. NASA adopted Manchester encoding for its precise synchronization capabilities during spacecraft communication."},{"question":"How does Manchester encoding work?","answer":"Manchester encoding divides each bit into two time slots and represents it as a transition within the slot. A logical '1' is represented by a rising edge in the middle of the time slot, while a logical '0' is represented by a falling edge in the middle of the time slot."},{"question":"What are the key features of Manchester encoding?","answer":"The key features of Manchester encoding include self-clocking, unambiguous decoding, error detection capabilities, and bi-phase representation, ensuring balanced power consumption."},{"question":"What are the types of Manchester encoding?","answer":"There are two main types of Manchester encoding: Manchester Differential Encoding (MDE) and Manchester Bi-Phase-L. MDE uses transitions in the middle of the bit time slot, while Bi-Phase-L uses transitions at the start of the time slot."},{"question":"How is Manchester encoding used?","answer":"Manchester encoding finds applications in Ethernet, wireless communication, and more. However, it has some limitations, such as bandwidth inefficiency and higher power consumption."},{"question":"What are the future perspectives related to Manchester encoding?","answer":"In the future, Manchester encoding may see improvements for high-speed adaptation, hybrid encoding techniques, and potential use in optical communication systems."},{"question":"How are proxy servers associated with Manchester encoding?","answer":"Proxy servers can optimize Manchester encoding usage by implementing caching mechanisms and reducing the need for repeated data transmissions, thus improving network efficiency."}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477951","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":1,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477951\/revisions"}],"predecessor-version":[{"id":505647,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477951\/revisions\/505647"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/477952"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=477951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}