{"id":809,"date":"2009-12-11T00:37:59","date_gmt":"2009-12-11T00:37:59","guid":{"rendered":"http:\/\/pchero21.com\/?p=809"},"modified":"2009-12-11T00:37:59","modified_gmt":"2009-12-11T00:37:59","slug":"aloha","status":"publish","type":"post","link":"http:\/\/pchero21.com\/?p=809","title":{"rendered":"ALOHA"},"content":{"rendered":"

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 ALOHA\ub294 \ud558\uc640\uc774 \ub9d0\ub85c ‘\uc548\ub155\ud558\uc138\uc694’\ub77c\ub294 \uc778\uc0ac\ub9d0\uc774\ub2e4. \uc54c\ub85c\ud558 \ub124\ud2b8\uc6cc\ud06c\ub294 \ubb34\uc120 \ub124\ud2b8\uc6cc\ud06c\uc778\ub370, \ud558\uc640\uc774 \ub300\ud559\uc5d0\uc11c \ud558\uc640\uc774\ub97c \ub458\ub7ec\uc2f8\ub294 \uac01 \uc12c\ub4e4\uacfc \ud1b5\uc2e0\ud558\uae30 \uc704\ud574 \ub9cc\ub4e0 \ub124\ud2b8\uc6cc\ud06c\ub2e4. 1970\ub144\ub300 \ucd08\uc5d0 \ub9cc\ub4e4\uc5c8\ub2e4\uace0 \ud55c\ub2e4. \uc1a1\uc2e0\uacfc \uc218\uc2e0 \uc8fc\ud30c\uc218\uac00 \uc870\uae08 \ub2e4\ub974\uace0(\uc804\uc1a1\uc740 407MHz, \uc218\uc2e0\uc740 413MHz) 9600bps\uc758 \uc18d\ub3c4\ub85c \ud328\ud0b7\uc744 \uc804\uc1a1\ud55c\ub2e4. \uc9c0\uae08 9600bps\ub294 \ub290\ub9b0 \uc18d\ub3c4\uc9c0\ub9cc \uadf8 \ub2f9\uc2dc\uc5d0\ub294 \uad38\uc7a5\ud55c \uc0ac\uac74\uc774\uc5c8\ub2e4\uace0 \ud55c\ub2e4. \ub54c\ubb38\uc5d0 \ub9ce\uc740 \uc5f0\uad6c\uc18c\uc5d0\uc11c \uad00\uc2ec\uc744 \uac00\uc9c0\uace0 ALOHA\ub97c \uc5f0\uad6c\ud558\uc600\ub294\ub370, \uc6b0\ub9ac\uc5d0\uac90 \ubcf5\uc0ac\uae30\ub85c \uc720\uba85\ud55c \uc81c\ub85d\uc2a4\uc0ac\uc758 Palo Alto \uc5f0\uad6c\uc18c\uc5d0\uc11c ALOHA \ub97c \uadfc\uac04\uc73c\ub85c \ud558\uc5ec Ethernet\uc744 \uac1c\ubc1c\ud558\uc600\ub2e4.<\/P>
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 \uc54c\ub85c\ud558 \ub124\ud2b8\uc6cc\ud06c\uc640 \uc774\ub354\ub137 \ub124\ud2b8\uc6cc\ud06c\uc758 \uacf5\ud1b5\uc810\uc740 \ub2e4\uc218\uac00 \ub124\ud2b8\uc6cc\ud06c\uc5d0 \uc811\uadfc\ud560 \uc218 \uc788\ub294 \ub124\ud2b8\uc6cc\ud06c, \uc989 \ub2e4\uc911 \uc5d1\uc138\uc2a4 \ub124\ud2b8\uc6cc\ud06c\uc778\ub370 \ub9cc\uc57d \ub3d9\uc2dc\uc5d0 \ubcf5\uc218\uc758 \uc0ac\uc6a9\uc790 \ub178\ub4dc\uac00 \ub124\ud2b8\uc6cc\ud06c\uc5d0 \uc811\uadfc\uc744 \uc2dc\uc791\ud558\uba74 \uc77c\uc815\ud55c \uc9c0\uc5f0(\uc0ac\uc2e4\uc740 \ub09c\uc218\ub97c \ud1a0\ub300\ub85c \ud55c \uc9c0\uc5f0) \ud6c4\uc5d0 \ub2e4\uc2dc \uc811\uadfc\uc744 \uc2dc\ub3c4\ud55c\ub2e4. \ubaa8\ub4e0 \ub178\ub4dc\ub4e4\uc740 \ub124\ud2b8\uc6cc\ud06c\uc0c1\uc5d0\uc11c \ub2e4\ub978 \uc0ac\uc6a9\uc790\uc758 \uc811\uadfc\uc744 \uac10\uc9c0\ud55c\ub2e4. \uc774\uac83\uc744 \ub124\ud2b8\uc6cc\ud06c \uc6a9\uc5b4\ub85c \uccad\ucde8(Listen)\uc774\ub77c\uace0 \ud558\ub294\ub370 \ubaa8\ub4e0 \ub178\ub4dc\ub294 \uace7 \ub9ac\uc2a4\ub108(Listener)\uc778 \uc148\uc774\ub2e4. \uc774 \ub9ac\uc2a4\ub108\ub294 \ucd5c\uadfc\uae4c\uc9c0\ub3c4 \uc774\ub354\ub137\uc744 \uadfc\uac04\uc73c\ub85c \ud558\ub294 \uc5ec\ub7ec \ub124\ud2b8\uc6cc\ud06c\uc5d0\uc11c \uc0ac\uc6a9\ud558\ub294 \uac1c\ub150\uc774\ub2e4.<\/P>
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 \uc54c\ub85c\ud558\uc758 \uc5c5\uc801\uc740 ‘\ucd5c\ucd08’\ub77c\ub294 \uac83\uc778\ub370 \ud558\ub098\uc758 \ud1b5\uc2e0 \ucc44\ub110\ub9cc\uc774 \uc811\uadfc\uc774 \uac00\ub2a5\ud558\ub2e4\ub294 \uc810\uc5d0\uc11c \ub3c5\uc810\uc801\uc774\ub77c\uace0 \ud560 \uc218 \uc788\ub2e4. \ud558\ub098\uc758 \ucc44\ub110\uc774 \ud1b5\uc2e0\uc911\uc774\uba74 \ub2e4\ub978 \ud1b5\uc2e0 \ucc44\ub110\uc740 \uc784\uc758\uc758 \uc2dc\uac04\ub3d9\uc548 \ub300\uae30\ud558\uc5ec\uc544 \ud55c\ub2e4. \uc0ac\uc2e4 \uc54c\ub85c\ud558\uc758 \uc774\ub7ec\ud55c \uc774\ub860\uc740 \uc774\ub354\ub137\ub3c4 \ub2e4\ub97c \ubc14 \uc5c6\uc9c0\ub9cc \uc774\ub354\ub137\uc740 \uc54c\ub85c\ud558\uac00 \ud1b5\uc2e0\ucc44\ub110\uc744 \uacf5\uc720\ud558\ub294\ub370 \ubc18\ud574, \ud2b9\uc815\ud55c \uc2dc\uac04\uc744 \uac01 \ub178\ub4dc\uc5d0 \ubd84\ud560\ud574\uc11c \uc811\uadfc\uc744 \ud5c8\uc6a9\ud558\ub294 \uc2dc\ubd84\ud560 \uc2dc\uc2a4\ud15c\uc774\ub2e4.<\/P>
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 \uc54c\ub85c\ud558\ub294 \uc544\uc8fc \uc0ac\ub77c\uc9c4 \uac83\uc774 \uc544\ub2c8\uace0, \uc9c0\uad6c \uc8fc\uc704\ub97c \ub3cc\uba70 \ud1b5\uc2e0\uc744 \ud558\ub294 \uc778\uacf5\uc704\uc131\uc758 \ub124\ud2b8\uc6cc\ud06c\uc5d0 \uc801\uc6a9\ub41c\ub2e4\uace0 \ud55c\ub2e4. \uc54c\ub85c\ud558\ub294 \uc5ec\ub7ec\uac00\uc9c0 \ubc84\uc804\uc774 \uc874\uc7ac\ud558\ub294\ub370 \ud06c\uac8c Slotted\uc640 Pure\uc758 \ub450 \uac00\uc9c0 \ubc84\uc804\uc774 \uc874\uc7ac\ud55c\ub2e4. Slotted\ub77c\uace0 \uc774\ub984 \ubd99\uc778 \uc774\uc720\ub294 \uac01 \ub178\ub4dc\uac04 \ud1b5\uc2e0\uc758 \uae30\uc900\uc744 \uc2dc\uac04\uc774\ub77c\ub294 \uc2ac\ub86f\uc73c\ub85c \ub098\ub204\uc5c8\uae30 \ub54c\ubb38\uc774\ub2e4. \uc6b0\ub9ac\uc758 \ucef4\ud4e8\ud130 \ub0b4\ubd80\uc5d0\ub3c4 \uc2ac\ub86f\uc774\ub77c\ub294 \uac83\uc774 \uc874\uc7ac\ud558\ub294\ub370, \uac01 \uc2ac\ub86f\uc5d0\ub294 \ud558\ub098\uc758 \uce74\ub4dc\ub97c \uaf42\uc744 \uc218 \uc788\ub2e4. \uc77c\uba85 \ube60\ucc21\uace0\ub77c\uace0 \ubd88\ub9ac\ub294 \uc2ac\ub86f\uba38\uc2e0\ub3c4 \uac01 \uc2ac\ub86f\uc774 \ud55c\ubc88\uc758 \ub808\ubc84 \uc870\uc791\uc73c\ub85c \uac01 \uc2ac\ub86f\uc774 \ub3cc\uc544\uac04\ub2e4.<\/P>
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 \uadf8\ub807\uae30 \ub54c\ubb38\uc5d0 \uc77c\uc815\ud55c \uc8fc\uae30\ub97c \uac00\uc9c0\ub294 \uc2dc\uac04 \ub2e8\uc704\uc758 \uc81c\uc57d\uc774 \uc0dd\uae34\ub2e4. Slotted ALOHA\ub294 \ucd5c\ub300 \uc804\uc1a1 \uc18d\ub3c4\uac00 36Kbps\uc758 \uc804\uc1a1\uc18d\ub3c4\ub97c \uac00\uc9c4\ub2e4. \uc774\uc5d0 \ube44\ud574 Pure ALOHA\ub294 \uc2dc\ub3c4 \ub54c\ub3c4 \uc5c6\uc774 \uc804\uc1a1\uc744 \uc2dc\uc791\ud560 \uc218 \uc788\ub2e4. \u3137 \ud504\ub85c\ud1a0\ucf5c\uc740 \uc2e4\uc81c \ud6a8\uc728\uc774 \ube44\uad50\uc801 \ub0ae\uae30 \ub54c\ubb38\uc5d0 \uc804\uc1a1\uc18d\ub3c4\uc758 \ud6a8\uc728\uc744 \ub192\uc774\uae30 \uc704\ud574\uc11c ‘\uc608\uc57d’\uc774\ub77c\ub294 \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud55c\ub2e4. SPADE\ub77c\ub294 \ud1b5\uc2e0\uc704\uc131\uc5d0\uc11c \uc0ac\uc6a9\ud558\ub294 \ud504\ub85c\ud1a0\ucf5c\uc774 \uc788\ub294\ub370, \uc608\uc57d\uc744 \uc704\ud55c \ucc44\ub110(128Kbps)\uc774 \uc788\uace0, \uc74c\uc131\uc804\uc1a1\uc6a9 \uc591\ubc29\ud5a5 \ucc44\ub110\uc774 397(64Kbps)\uac00 \uc788\ub2e4. \ub610 \uc608\uc57d \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud558\ub294 R.ALOHA(Reservation ALOHA)\ub77c\ub294 \uac83\uc774 \uc788\ub2e4.<\/P>
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 \uc774\ub7ec\ud55c \uc54c\ub85c\ud558\uc758 \ubcc0\ud615\ub4e4\uc774 \ucd5c\uadfc\uc5d0 \ud3ed\ubc1c\uc801\uc778 \uc288\uc694\uc758 \uc140\ub8f0\ub7ec \ud1b5\uc2e0 \ub124\ud2b8\uc6cc\ud06c\uc758 \uadfc\uac04\uc774\ub2e4. \uc140\ub8f0\ub7ec \ud1b5\uc2e0\uc740 \uc774\ub3d9\ud1b5\uc2e0\uc758 \ubc29\ubc95\uc774\ub2e4. \uac01 \uc9c0\uc5ed\uc744 \uc140(\uc138\ud3ec)\ub85c \ub098\ub204\uc5b4 \uc778\uc811 \uc140\ub4e4 \uac04\uc5d0 \uc8fc\ud30c\uc218\ub97c \ub2e4\ub974\uac8c \ud55c\ub2e4. \uac01 \uc140\ub4e4\uc774 \ubaa8\uc778 \uc77c\uc815 \uc9c0\uc5ed(\uad6c\uac04)\uc5d0\ub294 \uc911\uacc4\uc18c\ub97c \ub450\ub294\ub370, \uc774 \uc911\uacc4\uc18c\ub97c \uae30\uc9c0\uad6d\uc774\ub77c\uace0 \ud55c\ub2e4. \uc774 \uc911\uacc4\uc18c\ub4e4\uc740 \ubcf4\ud1b5 \uc0b0\uc545\uc9c0\uc5ed\uc5d0 \uc704\uce58\ud558\uac8c \ub418\ub294\ub370, \uc774\ub3d9\ud1b5\uc2e0 \uc0ac\uc5c5\uc790\ub294 \uc0b0\uc744 \uc798 \ud0c0\ub294 \uc9c1\uc6d0\ub4e4\uc744 \ucc44\uc6a9\ud558\ub294 \uc774\uc720\ub3c4 \uc774 \ub54c\ubb38\uc774\ub2e4.<\/P><\/p>\n","protected":false},"excerpt":{"rendered":"

   ALOHA\ub294 \ud558\uc640\uc774 \ub9d0\ub85c ‘\uc548\ub155\ud558\uc138\uc694’\ub77c\ub294 \uc778\uc0ac\ub9d0\uc774\ub2e4. \uc54c\ub85c\ud558 \ub124\ud2b8\uc6cc\ud06c\ub294 \ubb34\uc120 \ub124\ud2b8\uc6cc\ud06c\uc778\ub370, \ud558\uc640\uc774 \ub300\ud559\uc5d0\uc11c \ud558\uc640\uc774\ub97c \ub458\ub7ec\uc2f8\ub294 \uac01 \uc12c\ub4e4\uacfc \ud1b5\uc2e0\ud558\uae30 \uc704\ud574 \ub9cc\ub4e0 \ub124\ud2b8\uc6cc\ud06c\ub2e4. 1970\ub144\ub300 \ucd08\uc5d0 \ub9cc\ub4e4\uc5c8\ub2e4\uace0 \ud55c\ub2e4. \uc1a1\uc2e0\uacfc \uc218\uc2e0 \uc8fc\ud30c\uc218\uac00 \uc870\uae08 \ub2e4\ub974\uace0(\uc804\uc1a1\uc740 407MHz, \uc218\uc2e0\uc740 413MHz) 9600bps\uc758 \uc18d\ub3c4\ub85c \ud328\ud0b7\uc744 \uc804\uc1a1\ud55c\ub2e4. \uc9c0\uae08 9600bps\ub294 \ub290\ub9b0 \uc18d\ub3c4\uc9c0\ub9cc … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[48],"tags":[92,638],"_links":{"self":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts\/809"}],"collection":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=809"}],"version-history":[{"count":0,"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts\/809\/revisions"}],"wp:attachment":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=809"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=809"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}