{"id":21867,"date":"2026-08-19T23:44:50","date_gmt":"2026-08-19T15:44:50","guid":{"rendered":"https:\/\/www.luleey.com\/?p=21867"},"modified":"2026-08-19T23:44:55","modified_gmt":"2026-08-19T15:44:55","slug":"db-vs-dbm-in-fiber-optics-a-simple-guide","status":"publish","type":"post","link":"https:\/\/www.luleey.com\/ja\/db-vs-dbm-in-fiber-optics-a-simple-guide\/","title":{"rendered":"\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306b\u304a\u3051\u308bdB\u3068dBm\u306e\u9055\u3044\uff1a\u308f\u304b\u308a\u3084\u3059\u3044\u30ac\u30a4\u30c9"},"content":{"rendered":"<p class=\"wp-block-wd-paragraph wd-8928cf07\">\u3082\u3057\u3042\u308b <a style=\"color: #FF6A00;\" target=\"_blank\" href=\"https:\/\/www.luleey.com\/ja\/tag\/optical-power-meter\/\" title=\"\u5149\u30d1\u30ef\u30fc\u30e1\u30fc\u30bf\u30fc\u306e\u6295\u7a3f\u3092\u3059\u3079\u3066\u8868\u793a\">\u5149\u30d1\u30ef\u30fc\u30e1\u30fc\u30bf<\/a> \u8868\u793a <strong>-8 <a style=\"color: #FF6A00;\" target=\"_blank\" href=\"https:\/\/www.luleey.com\/ja\/tag\/db\/\" title=\"dB\u306e\u3059\u3079\u3066\u306e\u6295\u7a3f\u3092\u8868\u793a\">dB<\/a>m<\/strong>, \u3001\u3057\u304b\u3057\u30b3\u30cd\u30af\u30bf\u3084\u6e1b\u8870\u5668\u306e\u5b9a\u683c\u306f <strong>dB<\/strong>, \u3001\u305d\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1684c476\">\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u6700\u3082\u7c21\u5358\u306a\u65b9\u6cd5\u306f <strong>dB \u5bfe <a style=\"color: #FF6A00;\" target=\"_blank\" href=\"https:\/\/www.luleey.com\/ja\/tag\/dbm\/\" title=\"dBm \u306e\u3059\u3079\u3066\u306e\u6295\u7a3f\u3092\u8868\u793a\">dBm<\/a> \u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306b\u304a\u3044\u3066<\/strong> \u306f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>dBm\u306f\u5b9f\u969b\u306e <a style=\"color: #FF6A00;\" target=\"_blank\" href=\"https:\/\/www.luleey.com\/ja\/tag\/optical-power\/\" title=\"\u300c\u5149\u30d1\u30ef\u30fc\u300d\u306e\u3059\u3079\u3066\u306e\u6295\u7a3f\u3092\u8868\u793a\">\u5149\u51fa\u529b<\/a> \u3042\u308b\u6642\u70b9\u3067\u3002.<\/strong><\/li>\n\n\n\n<li><strong>dB\u306f\u30012\u3064\u306e\u70b9\u306e\u9593\u3067\u96fb\u529b\u304c\u3069\u308c\u3060\u3051\u5909\u5316\u3057\u305f\u304b\u3092\u793a\u3057\u307e\u3059\u3002.<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3a5a37d2\">dBm\u306f\u3001\u30bf\u30f3\u30af\u5185\u306b\u73fe\u5728\u5165\u3063\u3066\u3044\u308b\u6c34\u306e\u91cf\u3068\u6349\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4e00\u65b9\u3001dB\u306f\u3001\u5165\u53e3\u304b\u3089\u51fa\u53e3\u307e\u3067\u306e\u9593\u306b\u3069\u308c\u3060\u3051\u306e\u6c34\u304c\u5931\u308f\u308c\u305f\u304b\u3092\u8868\u3059\u3082\u306e\u3067\u3059\u3002.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" src=\"https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/26e74c8526992597ec7ab0cb7c3bf4bc_content_idfile_00000000798081f697e7f69295a69d6dts496431pfscid1sig69e862bf06e78efe9563ca24c4c010dae96fe3451bde1549983315bee2fbf9c3v0.png\" alt=\"\" class=\"wp-image-21868\" title=\"\" srcset=\"https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/26e74c8526992597ec7ab0cb7c3bf4bc_content_idfile_00000000798081f697e7f69295a69d6dts496431pfscid1sig69e862bf06e78efe9563ca24c4c010dae96fe3451bde1549983315bee2fbf9c3v0.png 1000w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/26e74c8526992597ec7ab0cb7c3bf4bc_content_idfile_00000000798081f697e7f69295a69d6dts496431pfscid1sig69e862bf06e78efe9563ca24c4c010dae96fe3451bde1549983315bee2fbf9c3v0-800x800.png 800w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/26e74c8526992597ec7ab0cb7c3bf4bc_content_idfile_00000000798081f697e7f69295a69d6dts496431pfscid1sig69e862bf06e78efe9563ca24c4c010dae96fe3451bde1549983315bee2fbf9c3v0-400x400.png 400w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/26e74c8526992597ec7ab0cb7c3bf4bc_content_idfile_00000000798081f697e7f69295a69d6dts496431pfscid1sig69e862bf06e78efe9563ca24c4c010dae96fe3451bde1549983315bee2fbf9c3v0-768x768.png 768w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/26e74c8526992597ec7ab0cb7c3bf4bc_content_idfile_00000000798081f697e7f69295a69d6dts496431pfscid1sig69e862bf06e78efe9563ca24c4c010dae96fe3451bde1549983315bee2fbf9c3v0-12x12.png 12w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/26e74c8526992597ec7ab0cb7c3bf4bc_content_idfile_00000000798081f697e7f69295a69d6dts496431pfscid1sig69e862bf06e78efe9563ca24c4c010dae96fe3451bde1549983315bee2fbf9c3v0-150x150.png 150w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-48ecefa0\">\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306b\u304a\u3051\u308bdB\u3068dBm\uff1a\u7c21\u5358\u306a\u6bd4\u8f03<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5358\u4f4d<\/th><th>\u305d\u306e\u5185\u5bb9<\/th><th>\u4e00\u822c\u7684\u306a\u7528\u9014<\/th><th>\u4f8b<\/th><\/tr><\/thead><tbody><tr><td>dBm<\/td><td>1\u30df\u30ea\u30ef\u30c3\u30c8\u3092\u57fa\u6e96\u3068\u3057\u305f\u7d76\u5bfe\u5149\u30d1\u30ef\u30fc<\/td><td>\u9001\u4fe1\u96fb\u529b\u3001\u53d7\u4fe1\u96fb\u529b\u3001\u304a\u3088\u3073\u96fb\u529b\u8a08\u306e\u6e2c\u5b9a\u5024<\/td><td>RX\u51fa\u529b = -8 dBm<\/td><\/tr><tr><td>dB<\/td><td>\u51fa\u529b\u6bd4\u3001\u5909\u5316\u3001\u5897\u6e1b<\/td><td>\u30b1\u30fc\u30d6\u30eb\u640d\u5931\u3001\u30b9\u30d7\u30ea\u30c3\u30bf\u306e\u640d\u5931\u3001\u304a\u3088\u3073\u6e1b\u8870\u5668\u306e\u5024<\/td><td>\u30ea\u30f3\u30af\u640d\u5931 = 5 dB<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8c14b9f7\">\u3053\u306e\u7c21\u5358\u306a\u30eb\u30fc\u30eb\u3092\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-wd-quote wd-quote wd-85bf1df2\">\n<p class=\"wp-block-wd-paragraph wd-ba1e7c1e\">\u96fb\u529b\u306fdBm\u3067\u8868\u3055\u308c\u307e\u3059\u3002\u6e1b\u8870\u91cf\u306fdB\u3067\u8868\u3055\u308c\u307e\u3059\u3002.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-405de4c5\">\u306b\u3064\u3044\u3066 <a href=\"https:\/\/www.thefoa.org\/tech\/ref\/testing\/test\/dB.html\" target=\"_blank\" rel=\"noopener\">\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u5354\u4f1a\u306e\u96fb\u529b\u6e2c\u5b9a\u30ac\u30a4\u30c9<\/a> \u3053\u308c\u3068\u540c\u3058\u5b9f\u7528\u7684\u306a\u533a\u5225\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5149\u30d1\u30ef\u30fc\u30e1\u30fc\u30bf\u30fc\u306f\u901a\u5e38\u3001\u57fa\u6e96\u5024\u304c\u8a2d\u5b9a\u3055\u308c\u305f\u5f8c\u3001\u51fa\u529b\u3092dBm\u5358\u4f4d\u3067\u3001\u76f8\u5bfe\u640d\u5931\u3092dB\u5358\u4f4d\u3067\u8868\u793a\u3057\u307e\u3059\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-5e3cb943\">\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306b\u304a\u3044\u3066\u3001dBm\u3068\u306f\u4f55\u3092\u610f\u5473\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7785c676\">dBm \u306f\u3001\u4ee5\u4e0b\u3092\u57fa\u6e96\u3068\u3057\u305f\u7d76\u5bfe\u96fb\u529b\u30ec\u30d9\u30eb\u3067\u3042\u308a\u3001 <strong>1\u30df\u30ea\u30ef\u30c3\u30c8<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>0 dBm = 1 mW<\/li>\n\n\n\n<li>-3 dBm \u2248 0.5 mW<\/li>\n\n\n\n<li>-10 dBm = 0.1 mW<\/li>\n\n\n\n<li>-20 dBm = 0.01 mW<\/li>\n\n\n\n<li>-30 dBm = 0.001 mW<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3a2e710b\">\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u3001dBm\u306e\u5024\u304c\u8ca0\u306b\u306a\u308b\u3053\u3068\u306f\u73cd\u3057\u304f\u3042\u308a\u307e\u305b\u3093\u3002\u8ca0\u306e\u7b26\u53f7\u304c\u3064\u3044\u3066\u3044\u308b\u304b\u3089\u3068\u3044\u3063\u3066\u3001\u5fc5\u305a\u3057\u3082\u63a5\u7d9a\u306b\u4e0d\u5177\u5408\u304c\u3042\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8a39f468\">\u91cd\u8981\u306a\u30eb\u30fc\u30eb\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-wd-quote wd-quote wd-14350a07\">\n<p class=\"wp-block-wd-paragraph wd-df1a2eca\"><strong>dBm\u306e\u5024\u304c\u8ca0\u306e\u5024\u306b\u306a\u308b\u307b\u3069\u3001\u5149\u51fa\u529b\u306f\u4f4e\u304f\u306a\u308a\u307e\u3059\u3002.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d2db2ce9\">\u4f8b\u3048\u3070\u3001\u3053\u3046\u3060\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>-5 dBm \u306f -15 dBm \u3088\u308a\u3082\u5f37\u3044\u3002.<\/li>\n\n\n\n<li>-15 dBm\u306f-25 dBm\u3088\u308a\u3082\u5f37\u3044\u3002.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3cdbe8ab\">\u3057\u304b\u3057\u3001\u5f37\u529b\u3067\u3042\u308c\u3070\u3042\u308b\u307b\u3069\u826f\u3044\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u53d7\u4fe1\u6a5f\u306f\u3001\u4fe1\u53f7\u304c\u611f\u5ea6\u9650\u754c\u3092\u4e0b\u56de\u308b\u3068\u52d5\u4f5c\u3057\u306a\u304f\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4fe1\u53f7\u304c\u6700\u5927\u5165\u529b\u30ec\u30d9\u30eb\u3092\u4e0a\u56de\u308b\u3068\u904e\u8ca0\u8377\u306b\u306a\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8828de75\">\u3059\u3079\u3066\u306e\u30d5\u30a1\u30a4\u30d0\u30fc\u30ea\u30f3\u30af\u306b\u5171\u901a\u3059\u308b\u300c\u6700\u9069\u306adBm\u5024\u300d\u3068\u3044\u3046\u3082\u306e\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u6e2c\u5b9a\u3055\u308c\u305f\u51fa\u529b\u3092\u3001\u4f7f\u7528\u3059\u308b\u30c8\u30e9\u30f3\u30b7\u30fc\u30d0\u30fc\u3001ONU\u3001ONT\u3001\u307e\u305f\u306f\u53d7\u4fe1\u6a5f\u3054\u3068\u306b\u6307\u5b9a\u3055\u308c\u3066\u3044\u308bTX\u307e\u305f\u306fRX\u306e\u7bc4\u56f2\u3068\u5e38\u306b\u6bd4\u8f03\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-df281d86\">\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306b\u304a\u3044\u3066\u3001dB\u3068\u306f\u4f55\u3092\u610f\u5473\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-10452741\">dB\u306f\u30012\u3064\u306e\u96fb\u529b\u30ec\u30d9\u30eb\u9593\u306e\u6bd4\u7387\u3084\u5909\u5316\u3092\u8868\u3057\u307e\u3059\u3002\u521d\u671f\u5024\u304c\u308f\u304b\u3089\u306a\u3044\u9650\u308a\u3001dB\u3060\u3051\u3067\u306f\u5b9f\u969b\u306e\u5149\u30d1\u30ef\u30fc\u3092\u77e5\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fcac0a80\">\u4ee3\u8868\u7684\u306a\u4f8b\u3068\u3057\u3066\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5149\u30d5\u30a1\u30a4\u30d0\u306e\u6e1b\u8870\u91cf\uff1a2 dB\uff1b;<\/li>\n\n\n\n<li>\u30b3\u30cd\u30af\u30bf\u304a\u3088\u3073\u63a5\u7d9a\u90e8\u306e\u640d\u5931\uff1a1 dB\uff1b;<\/li>\n\n\n\n<li>\u30b9\u30d7\u30ea\u30c3\u30bf\u306e\u640d\u5931\uff1a7 dB\uff1b;<\/li>\n\n\n\n<li>\u56fa\u5b9a\u6e1b\u8870\u5668\uff1a5 dB\uff1b;<\/li>\n\n\n\n<li>\u5897\u5e45\u5668\u30b2\u30a4\u30f3\uff1a10 dB\u3002.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e79ff960\">\u7d043 dB\u306e\u5909\u5316\u306f\u3001\u6e1b\u8870\u304b\u5897\u5e45\u304b\u306b\u3088\u3063\u3066\u3001\u96fb\u529b\u304c\u534a\u5206\u306b\u306a\u308b\u304b2\u500d\u306b\u306a\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u300210 dB\u306e\u6e1b\u8870\u306b\u3088\u308a\u3001\u96fb\u529b\u306f\u5143\u306e\u30ec\u30d9\u30eb\u306e10\u5206\u306e1\u306b\u306a\u308a\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-cd496afe\">\u901a\u5e38\u306e\u30ea\u30f3\u30af\u30d0\u30b8\u30a7\u30c3\u30c8\u306e\u8a08\u7b97\u3067\u306f\u3001\u5404\u69cb\u6210\u8981\u7d20\u306e\u640d\u5931\u306f\u901a\u5e38\u3001\u6b63\u306e\u6570\u5024\u3068\u3057\u3066\u8868\u3055\u308c\u3001\u521d\u671f\u306edBm\u5024\u304b\u3089\u5dee\u3057\u5f15\u304b\u308c\u307e\u3059\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-ca639e6d\">dBm\u304a\u3088\u3073dB\u304b\u3089\u53d7\u4fe1\u96fb\u529b\uff08RX Power\uff09\u3092\u8a08\u7b97\u3059\u308b\u65b9\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6a7e78f6\">\u30ea\u30f3\u30af\u306b\u53d7\u52d5\u640d\u5931\u306e\u307f\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u3053\u306e\u7c21\u5358\u306a\u8a08\u7b97\u5f0f\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-339c6351\"><strong>\u63a8\u5b9a\u53d7\u4fe1\u96fb\u529b\uff08dBm\uff09\uff1d\u9001\u4fe1\u96fb\u529b\uff08dBm\uff09\uff0d\u30ea\u30f3\u30af\u640d\u5931\u5408\u8a08\uff08dB\uff09<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-c801700e\">\u4f8b<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b0fe7b50\">\u3042\u308b\u9001\u4fe1\u6a5f\u304c\u4ee5\u4e0b\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u3068\u4eee\u5b9a\u3059\u308b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-56809886\"><strong>\u9001\u4fe1\u96fb\u529b = -2 dBm<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-533965e4\">\u3053\u306e\u30ea\u30f3\u30af\u306b\u306f\u4ee5\u4e0b\u306e\u5185\u5bb9\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u3001\u30b3\u30cd\u30af\u30bf\u3001\u30b9\u30d7\u30e9\u30a4\u30b9\uff1a3 dB\u306e\u640d\u5931\uff1b;<\/li>\n\n\n\n<li>\u5149\u6e1b\u8870\u5668\uff1a3 dB\u306e\u6e1b\u8870\u3002.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5f53e06c\">\u7dcf\u640d\u5931\uff1a<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3b1d0975\"><strong>3 dB \uff0b 3 dB \uff1d 6 dB<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-802ddb22\">\u63a8\u5b9a\u53d7\u4fe1\u96fb\u529b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-074441a0\"><strong>-2 dBm \u2212 6 dB = -8 dBm<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4319a548\">\u3057\u305f\u304c\u3063\u3066\u3001\u53d7\u4fe1\u6a5f\u5074\u3067\u306f\u7d04-8 dBm\u3068\u8868\u793a\u3055\u308c\u308b\u306f\u305a\u3067\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-74d3c48e\"><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/d42e1ab1c39362866870cd28b099ec33_content_idfile_0000000079e081f694cefb4aba043e05ts496431pfscid1sig7ca68c12b6fee6e97cfd8b292d4a856d85bd4f62b384a53ddce6e8206b346a67v0.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" src=\"https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/d42e1ab1c39362866870cd28b099ec33_content_idfile_0000000079e081f694cefb4aba043e05ts496431pfscid1sig7ca68c12b6fee6e97cfd8b292d4a856d85bd4f62b384a53ddce6e8206b346a67v0.png\" alt=\"\" class=\"wp-image-21869\" title=\"\" srcset=\"https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/d42e1ab1c39362866870cd28b099ec33_content_idfile_0000000079e081f694cefb4aba043e05ts496431pfscid1sig7ca68c12b6fee6e97cfd8b292d4a856d85bd4f62b384a53ddce6e8206b346a67v0.png 1000w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/d42e1ab1c39362866870cd28b099ec33_content_idfile_0000000079e081f694cefb4aba043e05ts496431pfscid1sig7ca68c12b6fee6e97cfd8b292d4a856d85bd4f62b384a53ddce6e8206b346a67v0-800x800.png 800w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/d42e1ab1c39362866870cd28b099ec33_content_idfile_0000000079e081f694cefb4aba043e05ts496431pfscid1sig7ca68c12b6fee6e97cfd8b292d4a856d85bd4f62b384a53ddce6e8206b346a67v0-400x400.png 400w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/d42e1ab1c39362866870cd28b099ec33_content_idfile_0000000079e081f694cefb4aba043e05ts496431pfscid1sig7ca68c12b6fee6e97cfd8b292d4a856d85bd4f62b384a53ddce6e8206b346a67v0-768x768.png 768w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/d42e1ab1c39362866870cd28b099ec33_content_idfile_0000000079e081f694cefb4aba043e05ts496431pfscid1sig7ca68c12b6fee6e97cfd8b292d4a856d85bd4f62b384a53ddce6e8206b346a67v0-12x12.png 12w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/08\/d42e1ab1c39362866870cd28b099ec33_content_idfile_0000000079e081f694cefb4aba043e05ts496431pfscid1sig7ca68c12b6fee6e97cfd8b292d4a856d85bd4f62b384a53ddce6e8206b346a67v0-150x150.png 150w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c74c68e5\">\u9001\u4fe1\u6a5f\u306e\u51fa\u529b\u3001\u914d\u7dda\u640d\u5931\u3001\u304a\u3088\u3073\u30e1\u30fc\u30bf\u30fc\u306e\u7cbe\u5ea6\u306b\u306f\u305d\u308c\u305e\u308c\u8a31\u5bb9\u8aa4\u5dee\u304c\u3042\u308b\u305f\u3081\u3001\u5b9f\u969b\u306e\u6e2c\u5b9a\u5024\u306f\u591a\u5c11\u7570\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ebe7ffaa\">\u306b\u3064\u3044\u3066 <a href=\"https:\/\/www.thefoa.org\/tech\/ref\/testing\/test\/loss-math.html\" target=\"_blank\" rel=\"noopener\">FOA\u306b\u3088\u308b\u5149\u640d\u5931\u306e\u8a08\u7b97\u5f0f\u306b\u95a2\u3059\u308b\u89e3\u8aac<\/a> \u307e\u305f\u30013 dB \u306f\u304a\u304a\u3088\u305d 2 \u500d\u306b\u76f8\u5f53\u3059\u308b\u3053\u3068\u3001\u304a\u3088\u3073\u5149\u51fa\u529b\u304c\u4f4e\u3044\u307b\u3069 dBm \u5024\u304c\u3088\u308a\u8ca0\u306e\u5024\u306b\u306a\u308b\u3053\u3068\u3082\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002dBm \u3068\u30df\u30ea\u30ef\u30c3\u30c8\u51fa\u529b\u306e\u95a2\u4fc2\u306b\u3064\u3044\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u6587\u732e\u306b\u3082\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002 <a href=\"https:\/\/www.itu.int\/epublications\/publication\/itu-t-g-650-2-2015-08-definitions-and-test-methods-for-statistical-and-non-linear-related-attributes-of-single-mode-fibre-and-cable\" target=\"_blank\" rel=\"noopener\">ITU-T G.650.2<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-7e4dd919\">\u5149\u30d1\u30ef\u30fc\u30e1\u30fc\u30bf\u30fc\u3067\u306edB\u304a\u3088\u3073dBm\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0a6a821b\">\u591a\u304f\u306e\u5149\u30d1\u30ef\u30fc\u30e1\u30fc\u30bf\u30fc\u306f\u3001dBm\u3068dB\u306e\u4e21\u65b9\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-6c1ac2ad\">\u5b9f\u969b\u306e\u96fb\u529b\u3092\u6e2c\u5b9a\u3059\u308b\u306b\u306fdBm\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9b563eac\">\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306f\u300cdBm\u300d\u3092\u9078\u629e\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9001\u4fe1\u6a5f\u306e\u51fa\u529b\u96fb\u529b\uff1b;<\/li>\n\n\n\n<li>\u53d7\u5149\u30d1\u30ef\u30fc\uff1b;<\/li>\n\n\n\n<li>ONU\u307e\u305f\u306fONT\u306e\u5165\u529b\u96fb\u529b\uff1b;<\/li>\n\n\n\n<li>SFP \u307e\u305f\u306f SFP+ \u306e\u5149\u4fe1\u53f7\u30ec\u30d9\u30eb\uff1b;<\/li>\n\n\n\n<li>\u6e1b\u8870\u5668\u306e\u524d\u304b\u5f8c\u304b\u3002.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c1aab37b\">\u6e2c\u5b9a\u3059\u308b\u6ce2\u9577\u306b\u5408\u308f\u305b\u3066\u30e1\u30fc\u30bf\u30fc\u3092\u8a2d\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5149\u30d1\u30ef\u30fc\u30e1\u30fc\u30bf\u30fc\u306f\u6ce2\u9577\u4f9d\u5b58\u306e\u6821\u6b63\u3092\u63a1\u7528\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u8aa4\u3063\u305f\u6ce2\u9577\u8a2d\u5b9a\u3067\u6e2c\u5b9a\u3092\u884c\u3063\u305f\u5834\u5408\u3001\u6e2c\u5b9a\u5024\u304c\u4e0d\u6b63\u78ba\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-e3fcd9bd\">\u76f8\u5bfe\u7684\u306a\u640d\u5931\u3092\u6e2c\u5b9a\u3059\u308b\u306b\u306fdB\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-36780b64\">\u6e2c\u5b9a\u5024\u3092\u57fa\u6e96\u5024\u3068\u6bd4\u8f03\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u300cdB\u300d\u3092\u9078\u629e\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-dcac06d9\">\u4f8b\u3048\u3070\u3001\u3053\u3046\u3060\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6b63\u5e38\u3067\u3042\u308b\u3053\u3068\u304c\u78ba\u8a8d\u6e08\u307f\u306e\u57fa\u6e96\u30b1\u30fc\u30d6\u30eb\u3092\u4ecb\u3057\u3066\u3001\u4fe1\u53f7\u6e90\u3092\u6e2c\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/li>\n\n\n\n<li>\u305d\u306e\u6e2c\u5b9a\u5024\u3092\u57fa\u6e96\u5024\u307e\u305f\u306f\u30bc\u30ed\u5024\u3068\u3057\u3066\u8a2d\u5b9a\u3057\u307e\u3059\u3002.<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u5bfe\u8c61\u306e\u30b1\u30fc\u30d6\u30eb\u307e\u305f\u306f\u90e8\u54c1\u3092\u53d6\u308a\u4ed8\u3051\u307e\u3059\u3002.<\/li>\n\n\n\n<li>\u8ffd\u52a0\u306e\u640d\u5931\u5024\u3092dB\u5358\u4f4d\u3067\u8aad\u307f\u53d6\u3063\u3066\u304f\u3060\u3055\u3044\u3002.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3cf71e7e\">\u57fa\u6e96\u306f\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6709\u52b9\u306a\u57fa\u6e96\u3092\u8a2d\u5b9a\u305b\u305a\u306b\u6e2c\u5b9a\u5668\u3092dB\u306b\u5207\u308a\u66ff\u3048\u3066\u3082\u3001\u81ea\u52d5\u7684\u306b\u610f\u5473\u306e\u3042\u308b\u6e1b\u8870\u91cf\u6e2c\u5b9a\u7d50\u679c\u304c\u5f97\u3089\u308c\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-9eca08b0\">dB\u3092dBm\u306b\u76f4\u63a5\u5909\u63db\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0dad6b10\">\u3044\u3044\u3048\u3002\u521d\u671f\u306e\u30d1\u30ef\u30fc\u30ec\u30d9\u30eb\u304c\u5fc5\u8981\u3067\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9c693d5b\">\u305f\u3068\u3048\u3070\u30015 dB\u306e\u6e1b\u8870\u304c\u3042\u3063\u3066\u3082\u3001\u305d\u308c\u3060\u3051\u3067\u306f\u6700\u7d42\u7684\u306adBm\u5024\u306f\u308f\u304b\u308a\u307e\u305b\u3093\u3002.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>0 dBm \u304b\u3089\u8a08\u7b97\u3059\u308b\u3068\uff1a0 dBm \u2212 5 dB = -5 dBm\u3002.<\/li>\n\n\n\n<li>-10 dBm \u304b\u3089\uff1a-10 dBm \u2212 5 dB = -15 dBm\u3002.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1b7bf74d\">\u521d\u671f\u306e\u51fa\u529b\u30ec\u30d9\u30eb\u304c\u7570\u306a\u308b\u305f\u3081\u3001\u540c\u30585 dB\u306e\u640d\u5931\u3067\u3082\u3001\u6700\u7d42\u7684\u306a\u51fa\u529b\u30ec\u30d9\u30eb\u306f\u7570\u306a\u3063\u3066\u304d\u307e\u3059\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-9d55f9a2\">\u5149\u6e1b\u8870\u5668\u306fdBm\u3092\u3069\u306e\u3088\u3046\u306b\u5909\u5316\u3055\u305b\u308b\u306e\u304b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-245f2137\">\u5149\u6e1b\u8870\u5668\u306f\u3001\u6240\u5b9a\u306e\u91cf\u306e\u640d\u5931\u3092\u767a\u751f\u3055\u305b\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3806f124\">\u6e2c\u5b9a\u3055\u308c\u305f\u96fb\u529b\u304c -4 dBm \u306e\u5834\u5408\u30015 dB \u306e\u6e1b\u8870\u5668\u3092\u8ffd\u52a0\u3059\u308b\u3068\uff1a<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2626170a\"><strong>-4 dBm \u2212 5 dB \u2252 -9 dBm<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0ca98cec\">\u3053\u306e\u8a08\u7b97\u306f\u3001\u53d7\u4fe1\u6a5f\u306e\u5165\u529b\u96fb\u529b\u304c\u6700\u5927\u5024\u3092\u8d85\u3048\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306e\u6e1b\u8870\u5668\u3092\u9078\u5b9a\u3059\u308b\u969b\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ec519971\">\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u898b\u3064\u3051\u305f\u76ee\u6a19\u5024\u3060\u3051\u3067\u6e1b\u8870\u5668\u3092\u9078\u3093\u3067\u306f\u3044\u3051\u307e\u305b\u3093\u3002\u307e\u305a\u3001\u4ee5\u4e0b\u306e\u70b9\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9f\u969b\u306b\u6e2c\u5b9a\u3055\u308c\u305f\u96fb\u529b\uff1b;<\/li>\n\n\n\n<li>\u53d7\u4fe1\u6a5f\u306e\u904e\u8ca0\u8377\u5236\u9650\uff1b;<\/li>\n\n\n\n<li>\u53d7\u4fe1\u611f\u5ea6\uff1b;<\/li>\n\n\n\n<li>\u65e2\u5b58\u306e\u30ea\u30f3\u30af\u306e\u55aa\u5931\uff1b;<\/li>\n\n\n\n<li>\u6e1b\u8870\u5668\u306e\u6ce2\u9577\u304a\u3088\u3073\u30b3\u30cd\u30af\u30bf\u306e\u7a2e\u985e\u3002.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-900a94d0\">LuLeey\u3067\u306f\u4ee5\u4e0b\u306e\u5546\u54c1\u3092\u53d6\u308a\u6271\u3063\u3066\u3044\u307e\u3059 <a href=\"https:\/\/www.luleey.com\/ja\/product-category\/optical-connector\/optical-attenuator\/\">\u56fa\u5b9a\u5f0f\u304a\u3088\u3073\u53ef\u5909\u5f0f\u306e\u5149\u6e1b\u8870\u5668<\/a> \u3055\u307e\u3056\u307e\u306a\u30b3\u30cd\u30af\u30bf\u3084\u640d\u5931\u8981\u4ef6\u306b\u5bfe\u5fdc\u3057\u3066\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-7bf05686\">SFP DDM\u306e\u6e2c\u5b9a\u5024\u304b\u3089\u30ea\u30f3\u30af\u640d\u5931\u3092\u7b97\u51fa\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7e889148\">\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u6b63\u3057\u3044\u5024\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9afac66b\">\u3042\u308b\u4f1d\u9001\u65b9\u5411\u306b\u3064\u3044\u3066\u306f\u3001\u4ee5\u4e0b\u3092\u6bd4\u8f03\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0dbc5a1c\"><strong>\u30ea\u30e2\u30fc\u30c8\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u9001\u4fe1\u96fb\u529b \u2192 \u30ed\u30fc\u30ab\u30eb\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u53d7\u4fe1\u96fb\u529b<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a5be7ae2\">\u901a\u5e38\u3001\u30ed\u30fc\u30ab\u30eb\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u9001\u4fe1\u96fb\u529b\u304b\u3089\u53d7\u4fe1\u96fb\u529b\u3092\u5dee\u3057\u5f15\u304b\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u3089\u306e\u6e2c\u5b9a\u5024\u306f\u76f8\u53cd\u3059\u308b\u4f1d\u9001\u65b9\u5411\u3092\u8868\u3057\u3066\u304a\u308a\u3001\u7570\u306a\u308b\u30d5\u30a1\u30a4\u30d0\u30fc\u3001\u30b3\u30cd\u30af\u30bf\u3001\u307e\u305f\u306f\u5149\u8def\u3092\u7d4c\u7531\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8e9d29be\">DDM\u306e\u6e2c\u5b9a\u5024\u306b\u3082\u7cbe\u5ea6\u306e\u9650\u754c\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306f\u76e3\u8996\u3084\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306b\u306f\u6709\u7528\u3067\u3059\u304c\u3001\u6b63\u5f0f\u306a\u640d\u5931\u8a66\u9a13\u3092\u884c\u3046\u5834\u5408\u306b\u306f\u3001\u72ec\u7acb\u3057\u3066\u6821\u6b63\u3055\u308c\u305f\u5149\u30d1\u30ef\u30fc\u30e1\u30fc\u30bf\u30fc\u306e\u65b9\u304c\u9069\u3057\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-11072550\">\u8aad\u3080 <a>SFP\u30c8\u30e9\u30f3\u30b7\u30fc\u30d0\u30fc\u306b\u304a\u3051\u308bDDM\uff0fDOM\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/a> \u9001\u4fe1\u51fa\u529b\u3001\u53d7\u4fe1\u51fa\u529b\u3001\u6e29\u5ea6\u3001\u305d\u306e\u4ed6\u306e\u8a3a\u65ad\u5024\u306b\u95a2\u3059\u308b\u8aac\u660e\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-d5b3f2b5\">dB\u3068dBm\u306b\u95a2\u3059\u308b\u3088\u304f\u3042\u308b\u9593\u9055\u3044<\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-8a26ced3\">\u9593\u9055\u3044\u305d\u306e1\uff1a-20 dBm\u306f-5 dBm\u3088\u308a\u3082\u5f37\u3044\u3068\u8003\u3048\u308b\u3053\u3068<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a5157917\">\u3088\u308a\u5f31\u3044\u3002-20 dBm\u306f\u3001-5 dBm\u3088\u308a\u3082\u5149\u51fa\u529b\u304c\u5c0f\u3055\u3044\u3053\u3068\u3092\u793a\u3059\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-9f7a9a9e\">\u9593\u9055\u3044\u305d\u306e2\uff1adBm\u306e\u5024\u306b\u53d7\u52d5\u640d\u5931\u3092\u52a0\u7b97\u3057\u3066\u3057\u307e\u3046\u3053\u3068<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-060a95bc\">\u30d1\u30c3\u30b7\u30d6\u30ea\u30f3\u30af\u306b\u3088\u3063\u30664 dB\u306e\u640d\u5931\u304c\u751f\u3058\u308b\u5834\u5408\u306f\u3001\u521d\u671f\u306edBm\u5024\u304b\u30894 dB\u3092\u5dee\u3057\u5f15\u304d\u307e\u3059\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-ff98e9f5\">\u9593\u9055\u3044\u305d\u306e3\uff1adB\u3092\u7d76\u5bfe\u7684\u306a\u97f3\u91cf\u30ec\u30d9\u30eb\u3068\u3057\u3066\u6271\u3046\u3053\u3068<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0416e6ae\">5 dB \u3068\u3044\u3063\u305f\u5024\u306f\u5909\u5316\u3092\u8868\u3059\u3082\u306e\u3067\u3059\u3002\u521d\u671f\u306e dBm \u5024\u304c\u306a\u3051\u308c\u3070\u3001\u6700\u7d42\u7684\u306a\u5149\u51fa\u529b\u3092\u793a\u3059\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-a32825b4\">\u9593\u9055\u3044\u305d\u306e4\uff1a\u4e07\u80fd\u306e\u7406\u60f3\u7684\u306aRX\u5024\u3092\u63a2\u305d\u3046\u3068\u3059\u308b<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9c4387ca\">GPON\u3001XGS-PON\u3001SFP\u3001SFP+\u3001\u304a\u3088\u3073\u9577\u8ddd\u96e2\u7528\u5149\u30ec\u30b7\u30fc\u30d0\u30fc\u306b\u3088\u3063\u3066\u3001\u5bfe\u5fdc\u3059\u308b\u96fb\u529b\u7bc4\u56f2\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u6e2c\u5b9a\u5024\u3092\u3001\u5f53\u8a72\u6a5f\u5668\u306e\u6b63\u78ba\u306a\u4ed5\u69d8\u66f8\u3068\u7167\u3089\u3057\u5408\u308f\u305b\u3066\u3054\u78ba\u8a8d\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-15e7bb1a\">\u9593\u9055\u3044\u305d\u306e5\uff1a\u6ce2\u9577\u8a2d\u5b9a\u3092\u8aa4\u308b\u3053\u3068<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8ca2fb1a\">\u4fe1\u53f7\u306b\u5408\u3063\u305f\u6e2c\u5b9a\u6ce2\u9577\u3092\u9078\u629e\u3057\u3066\u304f\u3060\u3055\u3044\u3002PON\u306e\u5b9f\u6a5f\u30c6\u30b9\u30c8\u3092\u884c\u3046\u5834\u5408\u306f\u3001\u5fc5\u8981\u306aPON\u6ce2\u9577\u304a\u3088\u3073\u6e2c\u5b9a\u65b9\u6cd5\u306b\u5bfe\u5fdc\u3057\u305f\u6e2c\u5b9a\u5668\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-55c112db\">\u6700\u7d42\u7684\u306a\u7b54\u3048<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-05988c60\">\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306b\u304a\u3051\u308bdB\u3068dBm\u306e\u9055\u3044\u306f\u5358\u7d14\u3067\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>dBm = \u3042\u308b\u4e00\u70b9\u306b\u304a\u3051\u308b\u5b9f\u969b\u306e\u5149\u51fa\u529b<\/strong><\/li>\n\n\n\n<li><strong>dB = 2\u70b9\u9593\u306e\u96fb\u529b\u306e\u5909\u5316\u3001\u5897\u6e1b\u91cf<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6d6ddee5\">\u53d7\u4fe1\u96fb\u529b\u3092\u63a8\u5b9a\u3059\u308b\u306b\u306f\u3001\u9001\u4fe1\u96fb\u529b\u3092dBm\u5358\u4f4d\u3067\u8868\u3057\u305f\u5024\u304b\u3089\u3001\u30ea\u30f3\u30af\u640d\u5931\u3092dB\u5358\u4f4d\u3067\u5dee\u3057\u5f15\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-60072b4f\"><strong>\u9001\u4fe1\u96fb\u529b\uff08dBm\uff09 \u2212 \u30ea\u30f3\u30af\u640d\u5931\uff08dB\uff09 = \u53d7\u4fe1\u96fb\u529b\uff08dBm\uff09<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-34a79669\">\u5b9f\u969b\u306e\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u30ea\u30f3\u30af\u3092\u30c6\u30b9\u30c8\u3059\u308b\u969b\u306f\u3001\u6b63\u3057\u3044\u6ce2\u9577\u3092\u4f7f\u7528\u3057\u3001\u640d\u5931\u6e2c\u5b9a\u306e\u305f\u3081\u306e\u9069\u5207\u306a\u57fa\u6e96\u3092\u8a2d\u5b9a\u3057\u3001\u6700\u7d42\u7684\u306a\u6e2c\u5b9a\u5024\u3092\u30ec\u30b7\u30fc\u30d0\u30fc\u306e\u6b63\u78ba\u306a\u4ed5\u69d8\u3068\u6bd4\u8f03\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0e4748cf\">\u5149\u30d1\u30ef\u30fc\u3084\u5236\u5fa1\u6e1b\u8870\u3092\u6e2c\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001LuLeey\u306e <a href=\"https:\/\/www.luleey.com\/ja\/product-category\/testers-and-tools\/optical-power-meter-and-visual-fault-locator\/\">\u5149\u30d1\u30ef\u30fc\u30e1\u30fc\u30bf\u30fc<\/a> \u307e\u305f\u3001\u304a\u5ba2\u69d8\u306e\u30ea\u30f3\u30af\u3067\u5fc5\u8981\u3068\u3055\u308c\u308b\u30b3\u30cd\u30af\u30bf\u306e\u7a2e\u985e\u3001\u6ce2\u9577\u3001\u6e2c\u5b9a\u7bc4\u56f2\u306b\u5fdc\u3058\u305f\u5149\u6e1b\u8870\u5668\u3082\u3054\u7528\u610f\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u5358\u4f4d\u3000\u8aac\u660e\u3000\u4e00\u822c\u7684\u306a\u7528\u9014\u3000\u4f8b\u3000dBm\u30001\u30df\u30ea\u30ef\u30c3\u30c8\u306e\u9001\u4fe1\u96fb\u529b\u3001\u53d7\u4fe1\u96fb\u529b\u3092\u57fa\u6e96\u3068\u3057\u305f\u7d76\u5bfe\u5149\u30d1\u30ef\u30fc\u3001\u304a\u3088\u3073<\/p>","protected":false},"author":1,"featured_media":21870,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[886],"tags":[57,1424,1421,1422,1425,1423],"class_list":["post-21867","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-network-maintenance","tag-optical-power-meter","tag-db","tag-dbm","tag-fiber-loss","tag-link-budget","tag-optical-power"],"_links":{"self":[{"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/posts\/21867","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/comments?post=21867"}],"version-history":[{"count":1,"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/posts\/21867\/revisions"}],"predecessor-version":[{"id":21871,"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/posts\/21867\/revisions\/21871"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/media\/21870"}],"wp:attachment":[{"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/media?parent=21867"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/categories?post=21867"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.luleey.com\/ja\/wp-json\/wp\/v2\/tags?post=21867"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}