{"id":22311,"date":"2026-09-21T11:16:16","date_gmt":"2026-09-21T03:16:16","guid":{"rendered":"https:\/\/www.luleey.com\/?p=22311"},"modified":"2026-09-20T11:20:47","modified_gmt":"2026-09-20T03:20:47","slug":"how-to-test-an-sfp-port-with-a-fiber-loopback","status":"publish","type":"post","link":"https:\/\/www.luleey.com\/ko\/how-to-test-an-sfp-port-with-a-fiber-loopback\/","title":{"rendered":"\uad11 \ub8e8\ud504\ubc31\uc744 \uc0ac\uc6a9\ud558\uc5ec SFP \ud3ec\ud2b8\ub97c \ud14c\uc2a4\ud2b8\ud558\ub294 \ubc29\ubc95"},"content":{"rendered":"<p class=\"wp-block-wd-paragraph wd-9d78ff3e\">~\uc5d0\uac8c <strong>test an <a style=\"color: #FF6A00;\" target=\"_blank\" href=\"https:\/\/www.luleey.com\/ko\/tag\/sfp\/\" title=\"SFP\uc758 \ubaa8\ub4e0 \uac8c\uc2dc\ubb3c \ubcf4\uae30\">SFP<\/a> ~\uac00 \uc788\ub294 \ud3ec\ud2b8 <a style=\"color: #FF6A00;\" target=\"_blank\" href=\"https:\/\/www.luleey.com\/ko\/tag\/fiber-loopback\/\" title=\"Fiber Loopback\uc758 \ubaa8\ub4e0 \uac8c\uc2dc\ubb3c \ubcf4\uae30\">\ud30c\uc774\ubc84 \ub8e8\ud504\ubc31<\/a><\/strong>, \uad11 \uc1a1\uc2e0\uae30\ub97c \uc62c\ubc14\ub974\uac8c \ub9e4\uce6d\ub41c \uc218\ub3d9\ud615 \uad11\uc12c\uc720 \uacbd\ub85c\ub97c \ud1b5\ud574 \uc218\uc2e0\uae30\uc5d0 \ub2e4\uc2dc \uc5f0\uacb0\ud558\uc2ed\uc2dc\uc624. \uc774\ub97c \ud1b5\ud574 \ub85c\uceec \ud638\uc2a4\ud2b8 \ud3ec\ud2b8, \ud2b8\ub79c\uc2dc\ubc84 \ubc0f \ucee4\ub125\ud130 \uacbd\ub85c\ub97c \uc6d0\uaca9 \uad11\uc12c\uc720 \uc124\ube44 \ubc0f \ud53c\uc5b4 \uc7a5\uce58\uc640 \ubd84\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-acbb8b30\">\uc774\ub294 \uc81c\ud55c\uc801\uc778 \uc9c4\ub2e8\uc77c \ubfd0, \uc644\uc804\ud55c \ub9c1\ud06c \uc778\uc99d\uc740 \uc544\ub2d9\ub2c8\ub2e4. LOS(Link Loss) \uc0c1\ud0dc\ub97c \ud574\uc18c\ud558\uac70\ub098 \uc778\ud130\ud398\uc774\uc2a4\ub97c \ud65c\uc131\ud654\ud558\ub294 \ub8e8\ud504\ubc31 \ud14c\uc2a4\ud2b8\ub9cc\uc73c\ub85c\ub294 \uc6d0\uaca9 \ucf00\uc774\ube14, \uc6d0\uaca9 \ub2e8\ub9d0\uae30, VLAN \uad6c\uc131 \ub610\ub294 \uc2e4\uc81c \ud658\uacbd\uc5d0\uc11c\uc758 \uc0c1\ud638 \uc6b4\uc6a9\uc131\uc744 \uc785\uc99d\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4. \uc5b4\ub5a4 \uc7a5\uce58\ub97c \uc5f0\uacb0\ud558\uae30 \uc804\uc5d0, \ubc18\uc0ac\ub41c \uad11 \ucd9c\ub825\uc774 \uc218\uc2e0\uae30\uc758 \ucd5c\ub300 \uc791\ub3d9 \uc785\ub825\uce58\ub97c \ucd08\uacfc\ud558\uc9c0 \uc54a\ub294\uc9c0 \ubc18\ub4dc\uc2dc \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/p>\n\n\n\n<div class=\"wp-block-wd-image wd-block-image wd-c6fd394d\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" class=\"wp-image-22313\" src=\"https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/test-sfp-port-fiber-loopback-hero.png\" alt=\"\" title=\"\" srcset=\"https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/test-sfp-port-fiber-loopback-hero.png 1000w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/test-sfp-port-fiber-loopback-hero-800x800.png 800w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/test-sfp-port-fiber-loopback-hero-400x400.png 400w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/test-sfp-port-fiber-loopback-hero-768x768.png 768w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/test-sfp-port-fiber-loopback-hero-12x12.png 12w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/test-sfp-port-fiber-loopback-hero-150x150.png 150w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/div>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-dede1808\">\uad11 \ub8e8\ud504\ubc31\uc744 \uc774\uc6a9\ud55c SFP \ud3ec\ud2b8 \ud14c\uc2a4\ud2b8: \ub2e4\ub8e8\ub294 \ub0b4\uc6a9<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-012700e3\">\uc774\uc911 \ubc29\uc2dd \uad11 \ud2b8\ub79c\uc2dc\ubc84\uc5d0\ub294 \uc1a1\uc2e0 \uce21\uacfc \uc218\uc2e0 \uce21\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc218\ub3d9\ud615 \uc774\uc911 \ubc29\uc2dd \ub8e8\ud504\ubc31\uc740 \ub2e4\uc74c\uacfc \uac19\uc774 \uc2e0\ud638\ub97c \uc804\ub2ec\ud569\ub2c8\ub2e4:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e60db6ed\"><strong>\ub85c\uceec \uc1a1\uc2e0(TX) \u2192 \uc9e7\uc740 \uad11\uc12c\uc720 \uacbd\ub85c \u2192 \ub85c\uceec \uc218\uc2e0(RX)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6844dc07\">\ud638\uc2a4\ud2b8, PHY, \uc774\ub354\ub137 PMD \ubc0f \ud3ec\ud2b8 \uad6c\uc131\uc5d0 \ub530\ub77c, \uc7a5\uce58\uac00 RX LOS\ub97c \ud574\uc81c\ud558\uac70\ub098 \uc218\uc2e0\uae30 \uc7a0\uae08 \uc0c1\ud0dc\ub97c \ubcf4\uace0\ud558\uac70\ub098 Link Up \uc0c1\ud0dc\ub97c \ud45c\uc2dc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc77c\ubd80 \ud50c\ub7ab\ud3fc\uc758 \uacbd\uc6b0 \uc804\uc6a9 \uc9c4\ub2e8 \ubaa8\ub4dc\ub098 \ub450 \ubc88\uc9f8 \ud3ec\ud2b8\uac00 \ud544\uc694\ud558\uae30 \ub54c\ubb38\uc5d0, \ubaa8\ub4e0 \uc720\ud6a8\ud55c \ub85c\uceec \uad11 \ub8e8\ud504\uc5d0\uc11c Link Up \uc0c1\ud0dc\uac00 \ubcf4\uc7a5\ub418\ub294 \uac83\uc740 \uc544\ub2d9\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f287cb85\">\uc774 \ud14c\uc2a4\ud2b8\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ud14c\uc2a4\ud2b8 \uc870\uac74 \ud558\uc5d0\uc11c \uc774\ub7ec\ud55c \ub85c\uceec \uc694\uc18c\ub97c \uad6c\ub3d9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud638\uc2a4\ud2b8\uac00 \ubaa8\ub4c8\uc744 \uc778\uc2dd\ud558\uace0 \uc804\uc6d0\uc744 \uacf5\uae09\ud558\ub294 \uae30\ub2a5<\/li>\n\n\n\n<li>\uc774 \ubaa8\ub4c8\uc758 \uad11 \uc1a1\uc2e0\uae30 \ubc0f \uc218\uc2e0\uae30<\/li>\n\n\n\n<li>\ub8e8\ud504\ubc31 \ucee4\ub125\ud130\uc640 \uc9e7\uc740 \uad11\uc12c\uc720 \uacbd\ub85c<\/li>\n\n\n\n<li>\uad00\uce21\ub41c \uc0c1\ud0dc\ub97c \ubc1c\uc0dd\uc2dc\ud0a4\uae30\uc5d0 \ucda9\ubd84\ud55c \ud638\uc2a4\ud2b8 \uc804\uae30\/SerDes \uacbd\ub85c<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8f53a1d3\">\uadf8\ub807\uc2b5\ub2c8\ub2e4 <strong>\uc544\ub2c8\uc694<\/strong> \uc0dd\uc0b0 \ud2b8\ub801\ud06c, \ud328\uce58 \ud328\ub110, \uc2a4\ud50c\ub77c\uc774\uc2a4, \uc6d0\uaca9 \ud2b8\ub79c\uc2dc\ubc84 \ub610\ub294 \uc6d0\uaca9 \ud638\uc2a4\ud2b8\ub97c \ud14c\uc2a4\ud2b8\ud569\ub2c8\ub2e4. \ub610\ud55c \uc720\uc6a9\ud55c \uc774\ub354\ub137 \ud2b8\ub798\ud53d\uc744 \uc790\ub3d9\uc73c\ub85c \uc0dd\uc131\ud558\uac70\ub098 \uac80\uc99d\ud558\uc9c0\ub294 \uc54a\uc2b5\ub2c8\ub2e4. \uc2a4\uc704\uce58\ub294 \uc77c\ubc18\uc801\uc778 \uc885\ub2e8 \uac04 \ud14c\uc2a4\ud2b8\uc640 \uac19\uc774 \ud3ec\ud2b8\ub97c \ud1b5\ud574 \ud504\ub808\uc784\uc744 \uc804\uc1a1\ud55c \ud6c4 \ub3d9\uc77c\ud55c \ud504\ub808\uc784\uc744 \ub2e4\uc2dc \uc218\uc2e0\ud558\uc9c0 \uc54a\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud328\ud0b7 \ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud558\ub824\uba74 \ud50c\ub7ab\ud3fc\uc5d0\uc11c \uc9c0\uc6d0\ud558\ub294 \uc9c4\ub2e8 \uae30\ub2a5, \ud2b8\ub798\ud53d \uc0dd\uc131\uae30 \ub610\ub294 \ubb38\uc11c\ud654\ub41c \ud14c\uc2a4\ud2b8 \ubc29\ubc95\uc774 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-6719bf2a\">1. \ub8e8\ud504\ubc31\uc744 \uc815\ud655\ud55c \uad11 \uc778\ud130\ud398\uc774\uc2a4\uc5d0 \uc5f0\uacb0\ud558\uc2ed\uc2dc\uc624.<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5e634b87\">\uba3c\uc800 \ud2b8\ub79c\uc2dc\ubc84\uc758 \ubd80\ud488 \ubc88\ud638\uc640 \ub370\uc774\ud130 \uc2dc\ud2b8\ubd80\ud130 \ud655\uc778\ud558\uc2ed\uc2dc\uc624. \ub8e8\ud504\ubc31\uc758 \ucee4\ub125\ud130, \uc5f0\ub9c8 \uc0c1\ud0dc \ubc0f \uad11\uc12c\uc720 \uc720\ud615\uc744 \ub2e8\uc21c\ud788 \uae08\uc18d \ubaa8\ub4c8 \ud615\uc2dd\uc774 \uc544\ub2cc \uad11\ud559 PMD\uc5d0 \ub9de\ucdb0\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e7724fdb\">\uc608\ub97c \ub4e4\uc5b4, \uc77c\ubc18\uc801\uc778 \ub4c0\ud50c\ub809\uc2a4 10GBASE-SR \uad11\ubaa8\ub4c8\uc740 \ub2e4\uc911\ubaa8\ub4dc \uad11\uc12c\uc720\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc18\uba74, \uc77c\ubc18\uc801\uc778 \ub4c0\ud50c\ub809\uc2a4 10GBASE-LR \uad11\ubaa8\ub4c8\uc740 \ub2e8\uc77c\ubaa8\ub4dc \uad11\uc12c\uc720\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4. IEEE 802.3 \ud45c\uc900\uc740 \uc774\ub354\ub137 \uc804\uc1a1 \uc18d\ub3c4\uc640 \ub9e4\uccb4\uc5d0 \ub530\ub77c \uc11c\ub85c \ub2e4\ub978 \ubb3c\ub9ac\uc801 \ub9e4\uccb4 \uc0ac\uc591\uc744 \uc815\uc758\ud558\uace0 \uc788\uc73c\uba70, <a href=\"https:\/\/ieeexplore.ieee.org\/document\/9844436\" target=\"_blank\" rel=\"noopener\">IEEE 802.3-2022 \uae30\ub85d<\/a> \uc774 \ubb38\uc11c\ub294 \ud45c\uc900 \ucc38\uc870 \uc790\ub8cc\uc774\uc9c0\ub9cc, \uc0ac\uc6a9\uc790\uc758 \ud558\ub4dc\uc6e8\uc5b4\uac00 \ubb34\uc5c7\uc744 \uc9c0\uc6d0\ud558\ub294\uc9c0\ub294 \ud574\ub2f9 \ud638\uc2a4\ud2b8 \ubc0f \ubaa8\ub4c8 \ubb38\uc11c\uc5d0 \uba85\uc2dc\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2060bef8\">\ub2e4\uc74c \ud56d\ubaa9 \uc911 \ubaa8\ub450\uc5d0 \ud574\ub2f9\ub418\ub294 \uac83\uc744 \uc120\ud0dd\ud558\uc2ed\uc2dc\uc624:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud638\uc2a4\ud2b8 \ubaa8\ub378, \ud3ec\ud2b8 \ubc88\ud638 \ubc0f \uc9c0\uc6d0\ub418\ub294 \uc804\uae30\/SerDes \ubaa8\ub4dc<\/li>\n\n\n\n<li>\ubaa8\ub4c8 \ubd80\ud488 \ubc88\ud638, \uac1c\uc815\ud310, \ucf54\ub529 \ubc0f \uad11\ud559 PMD<\/li>\n\n\n\n<li>\uc2e4\uc81c\ub85c \uc124\uc815\ub418\uac70\ub098 \ud611\uc0c1\ub41c \uc18d\ub3c4<\/li>\n\n\n\n<li>\uad11\uc12c\uc720 \uc885\ub958, \ucee4\ub125\ud130 \ubc0f \uc5f0\ub9c8<\/li>\n\n\n\n<li>\ud544\uc694\ud55c FEC, \uc790\ub3d9 \ud611\uc0c1 \ub610\ub294 \ud3ec\ud2b8 \ubaa8\ub4dc \uc124\uc815<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-230dcae2\">SFP, <a style=\"color: #FF6A00;\" target=\"_blank\" href=\"https:\/\/www.luleey.com\/ko\/tag\/sfp-2\/\" title=\"SFP+\uc758 \ubaa8\ub4e0 \uac8c\uc2dc\ubb3c \ubcf4\uae30\">SFP+<\/a> \ub610\ub294 SFP28 \ub77c\ubca8\ub9cc\uc73c\ub85c\ub294 \uc774\ub7ec\ud55c \uc758\ubb38\uc810\uc744 \ud574\uc18c\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4. \ubb3c\ub9ac\uc801 \ud638\ud658\uc131, \ud638\uc2a4\ud2b8 \uc9c0\uc6d0, \uc791\ub3d9 \ubaa8\ub4dc, \ub9c1\ud06c \uc18d\ub3c4 \ubc0f \uc2e4\uc81c \ud2b8\ub798\ud53d \uc131\ub2a5\uc740 \uac01\uac01 \ubcc4\uac1c\uc758 \uc0ac\uc2e4\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-4a230470\">BiDi \ud14c\uc2a4\ud2b8 \uc2dc \uc77c\ubc18\uc801\uc778 \uc218\ub3d9 \ub8e8\ud504\ubc31\uc744 \uc0ac\uc6a9\ud558\uc9c0 \ub9c8\uc2ed\uc2dc\uc624<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6cb08dd8\">\uc77c\ubc18\uc801\uc778 \ub2e8\uc77c \uad11\uc12c\uc720 \uc591\ubc29\ud5a5(BiDi) \uc30d\uc740 \uc0c1\ud638 \ubcf4\uc644\uc801\uc778 \uc1a1\uc2e0 \ubc0f \uc218\uc2e0 \ud30c\uc7a5\uc744 \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \ud55c \ubaa8\ub4c8\uc740 \ud2b9\uc815 \ud30c\uc7a5\uc73c\ub85c \uc2e0\ud638\ub97c \uc1a1\uc2e0\ud558\ub294 \ud55c\ud3b8, \uc218\uc2e0\uae30\uc5d0\uc11c\ub294 \ub2e4\ub978 \ud30c\uc7a5\uc758 \uc2e0\ud638\ub97c \uc218\uc2e0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc218\ub3d9\ud615 \uad11\uc12c\uc720 \ub8e8\ud504\ub294 \uc1a1\uc2e0\ub41c \ud30c\uc7a5\ub9cc\uc744 \ubc18\ud658\ud560 \ubfd0, \uc774\ub97c \ubcc0\ud658\ud558\uc9c0\ub294 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-77800a71\">\ub530\ub77c\uc11c BiDi \ubaa8\ub4c8\uc774 \uc815\uc0c1 \uc0c1\ud0dc\ub77c \ud558\ub354\ub77c\ub3c4 \ub9c1\ud06c\uac00 \uc5f0\uacb0\ub418\uc9c0 \uc54a\ub294 \uac83\uc774 \uc608\uc0c1\ub418\ub294 \uacb0\uacfc\uc77c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc62c\ubc14\ub974\uac8c \ub9e4\uce6d\ub41c \ud53c\uc5b4 \ub610\ub294 \ud30c\uc7a5\uc744 \uace0\ub824\ud55c \ud14c\uc2a4\ud2b8 \uc124\uc815\uc744 \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-f6ecaf2a\">2. \uc9e7\uc740 \ub8e8\ud504\ub97c \ub9cc\ub4e4\uae30 \uc804\uc5d0 \uc218\uc2e0\uae30\uc758 \uc804\uc6d0\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d841db02\">\uc774\ub294 \uc7a5\uac70\ub9ac \uad11\ud559 \uc7a5\uce58\uc5d0 \uc788\uc5b4 \uac00\uc7a5 \uc911\uc694\ud55c \uc548\uc804 \uc810\uac80 \uc0ac\ud56d\uc785\ub2c8\ub2e4. \uc804\uc1a1 \uad6c\uac04\uc5d0\ub294 \uc218 \ud0ac\ub85c\ubbf8\ud130\uc5d0 \ub2ec\ud558\ub294 \uad11\uc12c\uc720\uc640 \uc218 \ub370\uc2dc\ubca8\uc5d0 \ub2ec\ud558\ub294 \uc190\uc2e4\uc774 \ud3ec\ud568\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc9e7\uc740 \ub8e8\ud504\ubc31\uc740 \uc774\ub7ec\ud55c \uc190\uc2e4\uc758 \ub300\ubd80\ubd84\uc744 \uc81c\uac70\ud558\uc9c0\ub9cc, \uc218\uc2e0\uae30\ub85c \uacfc\ub3c4\ud55c \uc804\ub825\uc744 \ub418\ub3cc\ub824 \ubcf4\ub0bc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8fc4c68c\">\ud574\ub2f9 \ubaa8\ub4c8\uc758 \uc815\ud655\ud55c \ub370\uc774\ud130 \uc2dc\ud2b8\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc608\uc0c1\ub418\ub294 \ucd5c\ub300 \uc218\uc2e0 \ub808\ubca8\uc744 \uacc4\uc0b0\ud558\uc2ed\uc2dc\uc624:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6cd63786\"><strong>\ucd5c\ub300 \uc1a1\uc2e0 \uc804\ub825 \u2212 \ucd5c\uc18c \ub8e8\ud504\ubc31 \uacbd\ub85c \uc190\uc2e4 = \uc608\uc0c1 \ucd5c\ub300 \uc218\uc2e0 \uc804\ub825<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b78ca695\">\uacb0\uacfc\ub294 \uc218\uc2e0\uc790\uc758 <strong>\ucd5c\ub300 \uc791\ub3d9 \uc785\ub825<\/strong> \ud574\ub2f9 \ubaa8\ub4dc\uc5d0 \ub300\ud574. \ucee4\ub125\ud130, \ub8e8\ud504\ubc31 \ubc0f \uac10\uc1e0\uae30\uc758 \ud5c8\uc6a9 \uc624\ucc28\ub97c \ubaa8\ub450 \ud3ec\ud568\ud558\uc2ed\uc2dc\uc624. \ucd5c\ub300 \uc791\ub3d9 \uc785\ub825\uac12\uc744 \uc190\uc0c1 \uc784\uacc4\uac12\uc73c\ub85c \ub300\uccb4\ud558\uc9c0 \ub9c8\uc2ed\uc2dc\uc624. \ub450 \uac12\uc740 \uc11c\ub85c \ub2e4\ub978 \uc9c8\ubb38\uc5d0 \ub300\ud55c \ub2f5\uc744 \ub098\ud0c0\ub0c5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-aeaf3289\">\ub370\uc774\ud130 \uc2dc\ud2b8\uc5d0 \uc0c1\ubd80 \uc218\uc2e0\uae30 \ud55c\uacc4\uac12\uc774 \uba85\uc2dc\ub418\uc5b4 \uc788\uc9c0 \uc54a\ub2e4\uba74, \uc791\uc5c5\uc744 \uc911\ub2e8\ud558\uace0 \ud574\ub2f9 \uc815\ubcf4\ub97c \uc694\uccad\ud558\uc2ed\uc2dc\uc624. \uac10\uc1e0\uac00 \ud544\uc694\ud55c \uacbd\uc6b0, \uc0ac\uc591\uc774 \uc62c\ubc14\ub978 \uac10\uc1e0\ud615 \ub8e8\ud504\ubc31 \ub610\ub294 \uad11 \uac10\uc1e0\uae30\ub97c \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624. \ud328\uce58 \ucf54\ub4dc\ub97c \uc2ec\ud558\uac8c \uad6c\ubd80\ub824 \uc190\uc2e4\uc744 \uc720\ubc1c\ud558\uc9c0 \ub9c8\uc2ed\uc2dc\uc624.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6e7f7bc1\">\uc5f0\uacb0\uc774 \uc644\ub8cc\ub41c \ud6c4, <a style=\"color: #FF6A00;\" target=\"_blank\" href=\"https:\/\/www.luleey.com\/ko\/tag\/ddm\/\" title=\"DDM\uc758 \ubaa8\ub4e0 \uac8c\uc2dc\ubb3c \ubcf4\uae30\">DDM<\/a> \ubaa8\ub4c8\uacfc \ud638\uc2a4\ud2b8 \ubaa8\ub450 \ud574\ub2f9 \uae30\ub2a5\uc744 \ub178\ucd9c\ud558\ub294 \uacbd\uc6b0, \uc720\uc6a9\ud55c \uad50\ucc28 \ud655\uc778 \uc218\ub2e8\uc774 \ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4. <a href=\"https:\/\/members.snia.org\/document\/dl\/25916\" target=\"_blank\" rel=\"noopener\">SFF-8472<\/a> \uc628\ub3c4, \uacf5\uae09 \uc804\uc555, \uc1a1\uc2e0 \ubc14\uc774\uc5b4\uc2a4, \uc1a1\uc2e0 \uc804\ub825 \ubc0f \uc218\uc2e0 \uc804\ub825\uc5d0 \ub300\ud55c \uce21\uc815 \ud56d\ubaa9\uc744 \uc815\uc758\ud558\uba70, OMA \ubcf4\uace0\uc5d0\uc11c \uc81c\uacf5\ud558\ub294 \ud3c9\uade0 \uc218\uc2e0 \uc804\ub825\uacfc \uc774\ub97c \uad6c\ubd84\ud569\ub2c8\ub2e4. DDM\uc758 \uc815\ud655\ub3c4\uc640 \uc784\uacc4\uac12\uc740 \uc5ec\uc804\ud788 \ubaa8\ub4c8\uc5d0 \ub530\ub77c \ub2e4\ub974\ubbc0\ub85c, \uce21\uc815\uac12\uc744 \uc815\ud655\ud55c \uc791\ub3d9 \ud55c\uacc4\uce58\uc640 \ube44\uad50\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9bb9f6bb\">LuLeey\u2019s <a href=\"https:\/\/www.luleey.com\/ko\/what-is-ddm-dom-in-sfp-transceivers\/\">DDM\/DOM \ud604\uc7a5 \uc548\ub0b4\uc11c<\/a> 5\uac00\uc9c0 \uacf5\ud1b5\ub41c \uac00\uce58\ub97c \uc124\uba85\ud558\uace0 \uc788\uc73c\uba70, \ud55c\ud3b8 <a href=\"https:\/\/www.luleey.com\/ko\/sfp-receiver-overload-can-optical-power-be-too-high\/\">\uc218\uc2e0\uae30 \uacfc\ubd80\ud558 \uc548\ub0b4\uc11c<\/a> \uc0c1\ud55c\uac12 \uac80\uc0ac\uc5d0 \ub300\ud574 \ub354 \uc790\uc138\ud788 \ub2e4\ub8f9\ub2c8\ub2e4.<\/p>\n\n\n\n<div class=\"wp-block-wd-image wd-block-image wd-42ecff89\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" class=\"wp-image-22312\" src=\"https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/safe-sfp-loopback-test-flow.png\" alt=\"\" title=\"\" srcset=\"https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/safe-sfp-loopback-test-flow.png 1000w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/safe-sfp-loopback-test-flow-800x800.png 800w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/safe-sfp-loopback-test-flow-400x400.png 400w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/safe-sfp-loopback-test-flow-768x768.png 768w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/safe-sfp-loopback-test-flow-12x12.png 12w, https:\/\/www.luleey.com\/wp-content\/uploads\/2026\/09\/safe-sfp-loopback-test-flow-150x150.png 150w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/div>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-d72e2a62\">3. \ub85c\uceec \ub8e8\ud504\ubc31 \ud14c\uc2a4\ud2b8 \uc2e4\ud589<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d2565199\">\uc2b9\uc778\ub41c \uc720\uc9c0\ubcf4\uc218 \uc2dc\uac04\ub300\ub97c \uc774\uc6a9\ud558\uc2ed\uc2dc\uc624. \uc6b4\uc601 \uacbd\ub85c\ub97c \ubd84\ub9ac\ud558\uba74 \uc11c\ube44\uc2a4\uac00 \uc911\ub2e8\ub429\ub2c8\ub2e4.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\uae30\uc900\uac12\uc744 \uae30\ub85d\ud558\uc2ed\uc2dc\uc624.<\/strong> \ud638\uc2a4\ud2b8 \ubaa8\ub378, \ud3ec\ud2b8 \uad6c\uc131, \ubaa8\ub4c8 \uc2dd\ubcc4\uc790, \ud38c\uc6e8\uc5b4\/\ub4dc\ub77c\uc774\ubc84, \ud604\uc7ac \ub9c1\ud06c\/LOS \uc0c1\ud0dc, DDM \uce21\uc815\uac12 \ubc0f \uc624\ub958 \uce74\uc6b4\ud130\ub97c \uc800\uc7a5\ud569\ub2c8\ub2e4.<\/li>\n\n\n\n<li><strong>\uacc4\ud68d\ub41c \uc870\ud569\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/strong> PMD, \uc18d\ub3c4, \uad11\uc12c\uc720 \ub4f1\uae09, \ucee4\ub125\ud130\/\uc5f0\ub9c8 \uc0c1\ud0dc \ubc0f \uc548\uc804 \uc218\uc2e0 \ub808\ubca8\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624. \ucee4\ub125\ud130\uac00 \uc81c\ub300\ub85c \uc7a5\ucc29\ub418\uc5c8\ub2e4\ub294 \uc0ac\uc2e4\ub9cc\uc73c\ub85c\ub294 \uc791\uc5c5\uc744 \uc9c4\ud589\ud558\uc9c0 \ub9c8\uc2ed\uc2dc\uc624.<\/li>\n\n\n\n<li><strong>\uc810\uac80\ud558\uace0 \uccad\uc18c\ud558\uc2ed\uc2dc\uc624.<\/strong> \uc2b9\uc778\ub41c \uc7a5\ube44\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub8e8\ud504\ubc31 \ubc0f \ud2b8\ub79c\uc2dc\ubc84 \uc778\ud130\ud398\uc774\uc2a4\ub97c \uc810\uac80\ud558\uace0, \ud544\uc694\ud55c \uacbd\uc6b0 \uccad\uc18c\ud558\uc2ed\uc2dc\uc624. \ud574\ub2f9 <a href=\"https:\/\/foa.org\/tech\/ref\/testing\/test\/scope.html\" target=\"_blank\" rel=\"noopener\">\uad11\uc12c\uc720 \ud611\ud68c \ucee4\ub125\ud130 \uac00\uc774\ub4dc<\/a> \uacb0\ud569\ub41c \ud398\ub8f0 \uac04\uc5d0 \uc624\uc5fc \ubb3c\uc9c8\uc774 \uc5b4\ub5bb\uac8c \uc804\ud30c\ub420 \uc218 \uc788\ub294\uc9c0 \uc124\uba85\ud569\ub2c8\ub2e4. \uc808\ub300\ub85c \uad11\uc12c\uc720\ub098 \uad11 \ud3ec\ud2b8\ub97c \uc9c1\uc811 \ub4e4\uc5ec\ub2e4\ubcf4\uc9c0 \ub9d0\uace0, \uc801\uc808\ud55c \ud30c\uc6cc\ubbf8\ud130\uc640 \uc601\uc0c1 \uac80\uc0ac \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/li>\n\n\n\n<li><strong>\uc62c\ubc14\ub978 \ub8e8\ud504\ubc31\uc744 \uc0bd\uc785\ud558\uc2ed\uc2dc\uc624.<\/strong> \ucee4\ub125\ud130\ub97c \uc5b5\uc9c0\ub85c \ub07c\uc6b0\uac70\ub098 \ube44\ud2c0\uc9c0 \ub9d0\uace0 \ub85c\uceec TX\uc640 \ub85c\uceec RX\ub97c \uc5f0\uacb0\ud558\uc2ed\uc2dc\uc624. \ud638\uc2a4\ud2b8 \uc808\ucc28\uc5d0 \ub530\ub77c \uc758\ub3c4\ub41c \ud3ec\ud2b8 \ubaa8\ub4dc\ub97c \ud65c\uc131\ud654\ud558\uc2ed\uc2dc\uc624.<\/li>\n\n\n\n<li><strong>\uc0c1\ud0dc\uc640 \ubcc0\uacbd \uc0ac\ud56d\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/strong> \ubaa8\ub4c8 \uc7a5\ucc29 \uc5ec\ubd80, \uc1a1\uc2e0(TX) \uc624\ub958, \uc218\uc2e0(RX) LOS, \ub9c1\ud06c\/PCS \uc0c1\ud0dc, DDM \uc218\uc2e0 \uc804\ub825, \ub9c1\ud06c \uc774\ubca4\ud2b8 \ubc0f \uc0c8\ub85c\uc6b4 \uc624\ub958 \uce74\uc6b4\ud130 \ubcc0\uacbd \uc0ac\ud56d\uc744 \ud655\uc778\ud569\ub2c8\ub2e4. \uc2dc\uac04\ubcc4 \uc804\ud6c4 \ube44\uad50 \uacb0\uacfc\ub97c \uae30\ub85d\ud569\ub2c8\ub2e4.<\/li>\n\n\n\n<li><strong>\uc9c0\uc6d0\ub418\ub294 \uacbd\uc6b0\uc5d0\ub9cc \ud2b8\ub798\ud53d\uc744 \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/strong> \ud50c\ub7ab\ud3fc\uc5d0\uc11c \ubb38\uc11c\ud654\ub41c \ud3ec\ud2b8 \uc9c4\ub2e8 \ub610\ub294 \ud2b8\ub798\ud53d \ud14c\uc2a4\ud2b8 \uae30\ub2a5\uc744 \uc81c\uacf5\ud558\ub294 \uacbd\uc6b0, \ud574\ub2f9 \uc808\ucc28\ub97c \uc815\ud655\ud788 \ub530\ub974\uc2ed\uc2dc\uc624. \uc7a5\uce58 \uc790\uccb4\uc5d0 \ub300\ud55c ping \uc694\uccad\uc774 \ubb3c\ub9ac\uc801 \ud3ec\ud2b8\ub97c \ud1b5\uacfc\ud55c\ub2e4\uace0 \uac00\uc815\ud574\uc11c\ub294 \uc548 \ub429\ub2c8\ub2e4.<\/li>\n\n\n\n<li><strong>\uc81c\uac70\ud558\uace0 \ubcf5\uc6d0\ud558\uc138\uc694.<\/strong> \ud544\uc694\uc5d0 \ub530\ub77c \ud3ec\ud2b8\ub97c \ube44\ud65c\uc131\ud654\ud558\uac70\ub098 \uaca9\ub9ac\ud558\uace0, \ub8e8\ud504\ubc31\uc744 \uc81c\uac70\ud558\uba70, \uc778\ud130\ud398\uc774\uc2a4\ub97c \ubcf4\ud638\ud558\uace0 \uc815\ub9ac\ud55c \ub2e4\uc74c, \uc2b9\uc778\ub41c \uad6c\uc131\uc744 \ubcf5\uc6d0\ud558\uace0 \uc11c\ube44\uc2a4\uac00 \uc815\uc0c1\uc801\uc73c\ub85c \uc791\ub3d9\ud558\ub294\uc9c0 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-f16ced4b\">4. \uacb0\uacfc\ub97c \uacfc\uc7a5\ud558\uc9c0 \uc54a\uace0 \ud574\uc11d\ud558\uae30<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\uad00\ucc30<\/th><th>\uc9c0\uc6d0 \uae30\ub2a5<\/th><th>\ub2e4\uc74c\uc5d0 \ud655\uc778\ud574 \ubcfc \ub9cc\ud55c \uc0ac\ud56d<\/th><\/tr><\/thead><tbody><tr><td>\ubaa8\ub4c8\uc774 \uac10\uc9c0\ub418\uc9c0 \uc54a\uc558\uc2b5\ub2c8\ub2e4.<\/td><td>\ud604\uc7ac \uc124\uc815\uc5d0\uc11c\ub294 \ud638\uc2a4\ud2b8\uac00 \ubaa8\ub4c8\uc744 \uc77d\uac70\ub098 \uc218\ub77d\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.<\/td><td>\ucf00\uc774\uc9c0, \uc804\uc6d0, \ucf54\ub529, \uc9c0\uc6d0 \ubaa8\ub4c8 \ubaa9\ub85d, \ud38c\uc6e8\uc5b4 \ubc0f \ud3ec\ud2b8 \ubaa8\ub4dc \ud655\uc778<\/td><\/tr><tr><td>\ubaa8\ub4c8\uc774 \uac10\uc9c0\ub418\uc5c8\uc73c\ub098 RX LOS \uc2e0\ud638\uac00 \uacc4\uc18d \ud65c\uc131\ud654\ub41c \uc0c1\ud0dc\uc785\ub2c8\ub2e4<\/td><td>\ub85c\uceec \uc218\uc2e0\uae30\uac00 \uc815\uc0c1\uc801\uc778 \uc2e0\ud638\ub97c \uc218\uc2e0\ud558\uc9c0 \ubabb\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/td><td>TX \ud65c\uc131\ud654\/\uc624\ub958, \uad11\uc12c\uc720 \ubc0f \ud3f4\ub9ac\uc2f1 \uc77c\uce58 \uc5ec\ubd80, \ub8e8\ud504\ubc31 \uc5f0\uacb0 \uc0c1\ud0dc, \ud30c\uc7a5 \ub3d9\uc791 \ubc0f \uad11 \ucd9c\ub825\uc744 \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td><\/tr><tr><td>LOS\uac00 \ud574\uc81c\ub418\uac70\ub098 \ub9c1\ud06c\uac00 \uc815\uc0c1\uc801\uc73c\ub85c \ubcf5\uad6c\ub418\uba70 \uce74\uc6b4\ud130\uac00 \uc548\uc815\uc801\uc73c\ub85c \ud45c\uc2dc\ub429\ub2c8\ub2e4.<\/td><td>\ud14c\uc2a4\ud2b8\ub97c \uac70\uce5c \ud574\ub2f9 \uc9c0\uc5ed \uad11 \uacbd\ub85c\ub294 \uc774\ub7ec\ud55c \uc870\uac74 \ud558\uc5d0\uc11c \uc815\uc0c1\uc801\uc73c\ub85c \uc791\ub3d9\ud569\ub2c8\ub2e4.<\/td><td>\uc0dd\uc0b0 \ud328\uce58 \ucf00\uc774\ube14, \ud328\ub110, \ud2b8\ub801\ud06c \ubc0f \uc6d0\uaca9 \ud53c\uc5b4 \ucabd\uc73c\ub85c \uc774\ub3d9\ud569\ub2c8\ub2e4.<\/td><\/tr><tr><td>\ub9c1\ud06c\ub294 \ud45c\uc2dc\ub418\uc9c0\ub9cc \uc624\ub958\uac00 \ub298\uc5b4\ub0a9\ub2c8\ub2e4<\/td><td>\uc2e0\ud638\uac00 \uc788\ub2e4\uace0 \ud574\uc11c \ud504\ub808\uc784\uc774 \uae68\ub057\ud558\uac8c \uc804\uc1a1\ub418\ub294 \uac83\uc740 \uc544\ub2d9\ub2c8\ub2e4.<\/td><td>\uc804\ub825 \uc81c\ud55c, \uc624\uc5fc, PMD\/\uc804\uc1a1 \uc18d\ub3c4\/FEC \uc124\uc815 \ubc0f \ub85c\uceec \ubaa8\ub4c8\/\ud638\uc2a4\ud2b8 \uacbd\ub85c\ub97c \ud655\uc778\ud558\uc2ed\uc2dc\uc624.<\/td><\/tr><tr><td>BiDi \ubaa8\ub4c8\uc740 \uc790\uae30 \uc790\uc2e0\uacfc \uc5f0\uacb0\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/td><td>TX\uc640 RX\uc758 \ud30c\uc7a5\uc774 \ub2e4\ub974\uae30 \ub54c\ubb38\uc5d0 \uc774\ub294 \uc815\uc0c1\uc801\uc778 \ud604\uc0c1\uc77c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td><td>\ubb34\ub8cc\ub85c \uc81c\uacf5\ub418\ub294 BiDi \ud53c\uc5b4 \ub610\ub294 \ud30c\uc7a5 \uc778\uc2dd \uc124\uc815\uc744 \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a56bc152\">\ub85c\uceec \ub8e8\ud504 \ud14c\uc2a4\ud2b8\uac00 \uc131\uacf5\ud558\uba74 \uc624\ub958 \ubc94\uc704\uac00 \uc881\ud600\uc9d1\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \uc774\ub294 \uc628\ub3c4 \uc5ec\uc720, \uc7a5\uae30 \uc624\ucc28 \uc131\ub2a5 \ub610\ub294 \uc6d0\uaca9 \uc7a5\uce58\uc640\uc758 \ud638\ud658\uc131\uc744 \ubcf4\uc99d\ud558\uc9c0\ub294 \uc54a\uc2b5\ub2c8\ub2e4. \ubc18\ub300\ub85c, \ub8e8\ud504 \ud14c\uc2a4\ud2b8\uc5d0 \uc2e4\ud328\ud588\ub2e4\uace0 \ud574\uc11c \ubaa8\ub4c8\uc5d0 \uacb0\ud568\uc774 \uc788\ub2e4\ub294 \uac83\uc744 \uc989\uc2dc \uc99d\uba85\ud558\ub294 \uac83\uc740 \uc544\ub2d9\ub2c8\ub2e4. \ud14c\uc2a4\ud2b8 \uc124\uc815, \ud638\uc2a4\ud2b8 \ub3d9\uc791, \ud3ec\ud2b8 \uad6c\uc131 \ub610\ub294 \uad11 \ucd9c\ub825\uc758 \uacfc\ub2e4 \ub610\ub294 \ubd80\uc871 \ub4f1\uc774 \uc6d0\uc778\uc774 \ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-da0975f5\">\uc778\ud130\ud398\uc774\uc2a4\uac00 \uc5f0\uacb0\ub418\uc9c0\ub9cc \uc624\ub958\uac00 \ubc1c\uc0dd\ud558\uba74 LuLeey\uc758 \ubc29\ubc95\uc744 \ub530\ub77c \uc9c4\ud589\ud558\uc2ed\uc2dc\uc624. <a href=\"https:\/\/www.luleey.com\/ko\/sfp-crc-errors-with-normal-rx-power-what-to-check\/\">SFP CRC \ubb38\uc81c \ud574\uacb0 \uac00\uc774\ub4dc<\/a> \uadf8\ub9ac\uace0 \uacfc\uac70 \ub204\uc801\uac12\ubcf4\ub2e4\ub294 \ucd5c\uc2e0 \ub378\ud0c0 \uac12\uc744 \ube44\uad50\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-bb1f8201\">LuLeey \ub8e8\ud504\ubc31 \uc120\ud0dd\ud558\uae30<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2eacb4f2\">LuLeey\u2019s <a href=\"https:\/\/www.luleey.com\/ko\/product\/fiber-optic-loopback-lc-upc-om3-mm\/\">LC\/UPC OM3 \uba40\ud2f0\ubaa8\ub4dc \uad11\uc12c\uc720 \ub8e8\ud504\ubc31<\/a> \uc774 \uc81c\ud488\uc740 50\/125 \u00b5m \uba40\ud2f0\ubaa8\ub4dc \ucf00\uc774\ube14\ub85c, LC\/UPC \uc778\ud130\ud398\uc774\uc2a4\ub97c \uac16\ucd94\uace0 \uc788\uc73c\uba70 \uc0bd\uc785 \uc190\uc2e4\uc774 0.2 dB \uc774\ud558\uc778 \uac83\uc73c\ub85c \uba85\uc2dc\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub7ec\ud55c \uc0ac\uc2e4\ub4e4\ub9cc\uc73c\ub85c\ub294 \uc774 \uc81c\ud488\uc774 \ubc94\uc6a9\uc774\ub77c\uace0 \ud560 \uc218\ub294 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7c2bc1e9\">\uacf5\uac1c\ub41c \uac12\uc740 <strong>\ucd5c\ub300 \uc0bd\uc785 \uc190\uc2e4<\/strong>, \ubcf4\uc7a5\ub41c \ucd5c\uc18c \uac10\uc1e0\ub7c9\uc774 \uc544\ub2d9\ub2c8\ub2e4. \uc774 \uc815\ubcf4\ub9cc\uc73c\ub85c\ub294 \uc54c \uc218 \uc5c6\ub294 \uc1a1\uc2e0\uae30\/\uc218\uc2e0\uae30 \uc30d\uc5d0 \ub300\ud574 \uc9e7\uc740 \ub8e8\ud504\uac00 \uc548\uc804\ud558\ub2e4\ub294 \uac83\uc744 \uc99d\uba85\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4. \ub610\ud55c \uc774 \ud398\uc774\uc9c0\uc5d0\ub294 \uad11\ubc94\uc704\ud55c \uc18d\ub3c4 \uad00\ub828 \ud45c\ud604\uc774 \uc0ac\uc6a9\ub418\uace0 \uc788\uc73c\ubbc0\ub85c, SFP \uc81c\ud488\uad70 \uc774\ub984\uc774\ub098 \uacf5\uce6d \uc18d\ub3c4\ub9cc \ubcf4\uace0 \ub8e8\ud504\ubc31\uc744 \uc120\ud0dd\ud558\uae30\ubcf4\ub2e4\ub294 \uc815\ud655\ud55c PMD, \ub808\uc778 \uad6c\uc131, \ubaa8\ub4c8 \uc81c\ud55c \uc0ac\ud56d \ubc0f \ud638\uc2a4\ud2b8 \ub3d9\uc791\uc744 \uace0\ub824\ud558\uc5ec \uc120\ud0dd\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-14893bfa\"><strong>\ub2e4\uc74c \ub2e8\uacc4:<\/strong> LuLeey \uce21\uc5d0 \ud638\uc2a4\ud2b8 \ubaa8\ub378 \ubc0f \ud3ec\ud2b8, \ubaa8\ub4c8 \ubd80\ud488 \ubc88\ud638\/\ub9ac\ube44\uc804, \uad11\ud559 PMD, \uad11\uc12c\uc720\/\ucee4\ub125\ud130 \uc720\ud615, \uad6c\uc131\ub41c \uc804\uc1a1 \uc18d\ub3c4, \ud38c\uc6e8\uc5b4, \uadf8\ub9ac\uace0 \ubaa8\ub4c8\uc758 \uc1a1\uc2e0(TX)\/\uc218\uc2e0(RX) \ub3d9\uc791 \ud55c\uacc4\uce58\ub97c \ubcf4\ub0b4\uc8fc\uc2ed\uc2dc\uc624. \uadf8\ub7ec\uba74 LuLeey\uc5d0\uc11c \uc801\uc808\ud55c \ub8e8\ud504\ubc31 \uc720\ud615\uacfc \uc81c\uc5b4 \uac10\uc1e0\uac00 \ud544\uc694\ud55c\uc9c0 \uc5ec\ubd80\ub97c \ud655\uc778\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>","protected":false},"excerpt":{"rendered":"<p>\uad00\ucc30 \uc0ac\ud56d \uc9c0\uc6d0 \ub0b4\uc6a9 \ub2e4\uc74c \ud655\uc778 \uc0ac\ud56d \ubaa8\ub4c8\uc774 \uac10\uc9c0\ub418\uc9c0 \uc54a\uc74c \ud638\uc2a4\ud2b8\uac00 \ubaa8\ub4c8\uc744 \uc77d\uac70\ub098 \uc218\uc2e0\ud560 \uc218 \uc5c6\uc74c<\/p>","protected":false},"author":1,"featured_media":22313,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1078],"tags":[69,444,1668,1670,1642,1669,71],"class_list":["post-22311","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-user-operation-guide","tag-sfp","tag-ddm","tag-fiber-loopback","tag-lc-loopback","tag-network-maintenance","tag-optical-troubleshooting","tag-sfp-2"],"_links":{"self":[{"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/posts\/22311","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/comments?post=22311"}],"version-history":[{"count":1,"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/posts\/22311\/revisions"}],"predecessor-version":[{"id":22314,"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/posts\/22311\/revisions\/22314"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/media\/22313"}],"wp:attachment":[{"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/media?parent=22311"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/categories?post=22311"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.luleey.com\/ko\/wp-json\/wp\/v2\/tags?post=22311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}