{"id":334,"date":"2012-10-29T23:12:59","date_gmt":"2012-10-29T14:12:59","guid":{"rendered":"http:\/\/blog.k-goo.net\/?p=334"},"modified":"2012-11-06T21:59:13","modified_gmt":"2012-11-06T12:59:13","slug":"ethernet%e3%81%ae%e3%82%af%e3%83%ad%e3%83%83%e3%82%af%e5%81%8f%e5%b7%ae","status":"publish","type":"post","link":"https:\/\/blog.k-goo.net\/?p=334","title":{"rendered":"Ethernet\u306e\u30af\u30ed\u30c3\u30af\u504f\u5dee"},"content":{"rendered":"<p>\u25cbethernet\u306e\u30af\u30ed\u30c3\u30af\u504f\u5dee<\/p>\n<p>\u691c\u8a3c\u69cb\u6210\u3092\u8907\u6570\u53f0\u306eEth\u6a5f\u5668\u3067\u69cb\u6210\u3057\u3001\u30c6\u30b9\u30bf\u3092\u4f7f\u3063\u3066aging\u8a66\u9a13\u3092\u3057\u305f\u3002<br \/>\n\u3069\u308c\u3082\u30ef\u30a4\u30e4\u30ec\u30fc\u30c8\u306aEth\u6a5f\u5668\u306a\u306e\u3067\u3001\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306eLink 1Gbps fullrate\u3092<br \/>\n\u30c6\u30b9\u30bf\u304b\u3089\u6d41\u3057\u305f\u3093\u3060\u3093\u3051\u3069\u3001\u30fb\u30fb\u30fb\u30fb\u30d1\u30b1loss\u304c\u767a\u751f\u3059\u308b\u3002<\/p>\n<p>\u3053\u306e\u539f\u56e0\u304cehternet\u306e\u30af\u30ed\u30c3\u30af\u504f\u5dee\u3067\u3059\u3002<br \/>\n<tt><\/p>\n<pre>\r\n\u305d\u3082\u305d\u3082\u306a\u8a71\u3067\u3059\u304c\u3001ethernet\u3063\u3066Sonet,SDH\u7b49\u306e\u3088\u3046\u306b\u30af\u30ed\u30c3\u30af\u3092\u540c\u671f\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u3067\u3059\u304c\u3001\r\n\u305d\u308c\u305e\u308c\u81ea\u5206\u52dd\u624b\u306a\u30af\u30ed\u30c3\u30af\u306b\u3057\u305f\u304c\u3063\u3066\u901a\u4fe1\uff08\u9001\u53d7\u4fe1\uff09\u3057\u3066\u3044\u307e\u3059\u3002\r\n\u3067\u3001\u3053\u306e\u8aa4\u5dee\u304c\u30af\u30ed\u30c3\u30af\u504f\u5dee\u3067\u3059\u3002\r\n\r\n802.3\/ethernet\u3067\u306f\u3001\r\n<p style=\"background-color: #e6e6fa; border: 1px dotted #CCCCCC; padding: 5px;\">\u30fb125Mhz\u306e\u30af\u30ed\u30c3\u30af\u4fe1\u53f7\u3067\u3001\r\n\u30fb\u00b1100ppm \u306e\u8aa4\u5dee\u3092\u8a31\u5bb9\u3057\u3066\u3044\u307e\u3059\u3002\r\n\uff0a(ppm\u306fparts per million\u30670.01%)<\/p>\r\n\u3068\u898f\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\r\n\u306a\u306e\u3067\u3001\u96a3\u63a5\u6a5f\u5668\u540c\u58eb\u3067\u6700\u5927200ppm(0.02%)\u306e\u8aa4\u5dee\u304c\u751f\u307e\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\r\n\u3088\u3063\u3066\u7406\u8ad6\u4e0a\u306f\u3001fullrate\u306e99.98%\u307e\u3067\u3057\u304b\u8a31\u5bb9\u3067\u304d\u307e\u305b\u3093\u3002\r\n\r\n\u305d\u3082\u305d\u3082\u3001\u30af\u30ed\u30c3\u30af\u5dee\u7570\u304c\u3042\u308b\u6642\u70b9\u3067loss\u306a\u3057\u3067\u30d1\u30b1\u30c3\u30c8\u53d7\u3051\u53d6\u308c\u306a\u3044\u3093\u3067\u306f\u306a\u3044\u304b\u3068\u304b\u3093\u304c\u3048\u307e\u3059\u304c\u3001\r\n\u3042\u308b\u7a0b\u5ea6\u307e\u3067\u30d0\u30c3\u30d5\u30a1\u3067\u8a31\u5bb9\u3057\u3066\u8ee2\u9001\u3057\u307e\u3059\u3002\u30d0\u30c3\u30d5\u30a1\u304c\u3042\u3075\u308c\u305d\u3046\u306b\u306a\u308b\u3068\u3001\r\nIFG(Inter Frame Gap)\u3067\u8abf\u6574\u3057\u307e\u3059\u3002\r\n*\u3053\u3053\u304b\u3089Frame Format\u306e\u5fa9\u7fd2\r\n<p style=\"background-color: #e6e6fa; border: 1px dotted #CCCCCC; padding: 5px;\">*ethernet\u306eframe format\r\n+-------+-------+-----+------------------+-----+\r\n|dst-mac|src-mac|type |       data       | FCS |\r\n+-------+-------+-----+------------------+-----+\r\n <- 6 -> <- 6 -> < 4 > <-   46\uff5e15000  -> < 4 >  <---byte\r\n <-            64 \uff5e 1518 byte               -><\/p>\r\n64\uff5e1518byte\u306eehternet frame\u3067\u3059\u3002\r\n(\u3061\u306a\u307f\u306bMTU\u306fehternet frame\u3067\u3044\u3046\u3068\u3053\u308d\u306edata\u90e8\u5206\u306e\u3053\u3068\u3067\u3059\u3002)\r\n\u3053\u308c\u306f\u3001Layer2\u306e\u7bc4\u56f2\u306a\u306e\u3067\u3001Layre1\u306eframe\u304c\u3064\u304d\u307e\u3059\u3002\r\n<p style=\"background-color: #e6e6fa; border: 1px dotted #CCCCCC; padding: 5px;\">*L1\u9001\u4fe1 Frame\r\n <--- L1 ---> < -----------------  L2  -------------------->\r\n+--------+---+-------+-------+-----+------------------+-----+\r\n|preamble|SFD|dst-mac|src-mac|type |       data       | FCS |\r\n+--------+---+-------+-------+-----+------------------+-----+\r\n <-  7 -> <1> <-              64 \uff5e 1518                  ->   <---byte\r\n<\/p>\r\n\u3053\u306eFrame\u3092\u30af\u30ed\u30c3\u30af\u306b\u3057\u305f\u304c\u3063\u3066\u9001\u4fe1\u3057\u307e\u3059\u304c\u3001\r\nFrame\u306e\u9001\u4fe1\u9593\u9694\u309296bit(12byte\u5206)\u6642\u9593\u4ee5\u4e0a\u3042\u3051\u308b\u3053\u3068\u306b\u304d\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002\r\n\u3053\u308c\u304cIFG(Inter Frame Gap)\u3067\u3059\u3002\r\n\r\nIFG\u306f12byte\u5206\u3068\u3089\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u53d7\u4fe1\u5074\u3067\u306f\u3001\u6700\u4f4e5byte\u3042\u308c\u3070\u3044\u3044\u3088\u3002\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002\r\n\u3053\u306e\u5dee\u5206\u3092\u4f7f\u3063\u3066\u8abf\u6574\u3057\u307e\u3059\u3002\r\n\r\n<\u304a\u307e\u3051>\r\n\u30e6\u30fc\u30b6\u306e\u7acb\u5834\u3067\u8a66\u9a13\u3059\u308b\u5834\u5408\u3001fullrate\u306e99.4-7%\u304f\u3089\u3044\u3067\u8a66\u9a13\u3059\u308b\u3053\u3068\u304c\u304a\u304a\u3044\u3088\u3046\u3067\u3059\u3002\r\n\u5358\u4f53\u8a66\u9a13\u306a\u3089\u3070\u3001\u308f\u3056\u3068\u3001fullrate\u3092\u6d41\u3057\u3066\u3001loss\u7387\u3092\u6bd4\u3079\u308b\u3053\u3068\u3067\u3001\u30d0\u30c3\u30d5\u30a1\u306e\u5927\u304d\u3055\u3092\u6bd4\u8f03\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\r\n\u3042\u308f\u305b\u3066latency\u306b\u3064\u3044\u3066\u3082\u8a55\u4fa1\u3067\u304d\u307e\u3059\u3002\r\n\r\n<\/tt><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u25cbethernet\u306e\u30af\u30ed\u30c3\u30af\u504f\u5dee \u691c\u8a3c\u69cb\u6210\u3092\u8907\u6570\u53f0\u306eEth\u6a5f\u5668\u3067\u69cb\u6210\u3057\u3001\u30c6\u30b9\u30bf\u3092\u4f7f\u3063\u3066aging\u8a66\u9a13\u3092\u3057\u305f\u3002 \u3069\u308c\u3082\u30ef\u30a4\u30e4\u30ec\u30fc\u30c8\u306aEth\u6a5f\u5668\u306a\u306e\u3067\u3001\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306eLink 1Gbps fullrate\u3092 \u30c6\u30b9\u30bf\u304b\u3089\u6d41\u3057\u305f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-334","post","type-post","status-publish","format-standard","hentry","category-ethernet"],"_links":{"self":[{"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/posts\/334","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=334"}],"version-history":[{"count":16,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/posts\/334\/revisions"}],"predecessor-version":[{"id":352,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/posts\/334\/revisions\/352"}],"wp:attachment":[{"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}