{"id":227,"date":"2019-07-28T00:09:52","date_gmt":"2019-07-28T00:09:52","guid":{"rendered":"http:\/\/www.jayjaydream.com\/?p=227"},"modified":"2019-08-11T14:15:26","modified_gmt":"2019-08-11T14:15:26","slug":"%e7%ac%ac%e4%b8%89%e7%ab%a0%e5%b9%bf%e5%9f%9f%e9%80%9a%e4%bf%a1%e7%bd%91%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b03","status":"publish","type":"post","link":"https:\/\/www.jayjaydream.com\/?p=227","title":{"rendered":"\u8f6f\u8003\u7f51\u7edc\u5de5\u7a0b\u5e08\u5907\u8003\u5b66\u4e60\u7b14\u8bb03-\u7b2c\u4e09\u7ae0\u5e7f\u57df\u901a\u4fe1\u7f51"},"content":{"rendered":"

\u7b2c\u4e09\u7ae0\u5e7f\u57df\u901a\u4fe1\u7f51\u76ee\u5f55<\/strong><\/h2>\n

3.1\u516c\u5171\u4ea4\u6362\u7535\u8bdd\u7f51<\/strong>
\n3.1.1\u7535\u8bdd\u7cfb\u7edf\u7684\u7ed3\u6784
\n3.1.2\u672c\u5730\u56de\u8def
\n3.1.3\u8c03\u5236\u89e3\u8c03\u5668
\n3.2X.25\u516c\u5171\u6570\u636e\u7f51<\/strong>
\n3.2.1\u6d41\u91cf\u63a7\u5236\u548c\u5dee\u9519\u63a7\u5236
\n3.2.2HDLC\u534f\u8bae
\n3.2.3X.25PLP\u534f\u8bae
\n3.3\u5e27\u4e2d\u7ee7\u7f51<\/strong>
\n3.3.1\u5e27\u4e2d\u7ee7\u4e1a\u52a1
\n3.3.2\u5e27\u4e2d\u7ee7\u534f\u8bae
\n3.3.3\u5e27\u4e2d\u7ee7\u7684\u5e94\u7528
\n3.4ISDN\u548cATM<\/strong>
\n3.4.1\u7efc\u5408\u4e1a\u52a1\u6570\u5b57\u7f51
\n3.4.2ATM\u865a\u7535\u8def
\n3.4.3ATM\u9ad8\u5c42
\n3.4.4ATM\u9002\u914d\u5c42
\n3.4.5ATM\u901a\u4fe1\u7ba1\u7406<\/p>\n

\u7b2c\u4e09\u7ae0\u5e7f\u57df\u901a\u4fe1\u7f51\u5b66\u4e60\u7b14\u8bb0<\/strong><\/h2>\n

\u4e00\u3001\u5e7f\u57df\u7f51\u6982\u5ff5\u548c\u5206\u7c7b<\/p>\n

\u4e8c\u3001\u516c\u5171\u4ea4\u6362\u7535\u8bdd\u7f51PSTN<\/p>\n

\u4e09\u3001\u516c\u516c\u6570\u636e\u7f51X.25<\/p>\n

\u56db\u3001\u5e27\u4e2d\u7ee7\u7f51FR<\/p>\n

\u4e94\u3001\u7efc\u5408\u4e1a\u52a1\u6570\u636e\u7f51ISDN<\/p>\n

\u516d\u3001\u5f02\u6b65\u4f20\u8f93\u6a21\u5f0fATM<\/p>\n

\u4e00\u3001\u5e7f\u57df\u7f51\u6982\u5ff5\u548c\u5206\u7c7b<\/h3>\n

\u5e7f\u57df\u7f51\uff1a\u5e7f\u57df\u7f51\u662f\u6307\u957f\u8ddd\u79bb\u8de8\u5730\u533a\u7684\u5404\u79cd\u5c40\u57df\u7f51\u3001\u8ba1\u7b97\u673a\u3001\u7ec8\u7aef\u4e92\u8054\u5728\u4e00\u8d77\uff0c\u7ec4\u6210\u4e00\u4e2a\u8d44\u6e90\u5171\u4eab\u7684\u901a\u4fe1\u7f51\u7edc\u3002<\/p>\n

\u4f20\u7edf\u5e7f\u57df\u7f51
\n\u516c\u5171\u4ea4\u6362\u7535\u8bdd\u7f51 \u516c\u516c\u6570\u636e\u7f51X.25 \u5e27\u4e2d\u7ee7\u7f51FR
\n\u7efc\u5408\u4e1a\u52a1\u6570\u636e\u7f51ISDN \u5f02\u6b65\u4f20\u8f93\u6a21\u5f0fATM \u865a\u62df\u4e13\u7528\u7f51VPN
\n\u73b0\u4ee3\u5e7f\u57df\u7f51
\n\u6570\u5b57\u6570\u636e\u7f51DDN \u540c\u6b65\u6570\u5b57\u4f20\u8f93\u7f51SDH \u591a\u4e1a\u52a1\u4f20\u9001\u5e73\u53f0MATP
\n\u5149\u7ea4\u63a5\u5165\u7f51FTTX \u65e0\u6e90\u5149\u7f51\u7edcPON \u65e0\u7ebf\u7f51WiMAX\u3001\uff14G<\/p>\n

\u4e8c\u3001\u516c\u5171\u4ea4\u6362\u7535\u8bdd\u7f51PSTN<\/h3>\n

\u516c\u5171\u4ea4\u6362\u7535\u8bdd\u7f51PSTN\uff1a\u5229\u7528\u7535\u8bdd\u7ebf\u4e0a\u7f51\uff0c\u65e9\u671f\u662f\u7535\u8bdd+\u201c\u732b\u201d\u62e8\u53f7\u4e0a\u7f51\u3002<\/p>\n

\u56db\u4e2a\u7279\u6027\uff1a\u673a\u68b0\u7279\u6027\u3001\u7535\u6c14\u7279\u6027\uff08V.28\u6807\u51c6\u7535\u8def\uff09\u3001\u529f\u80fd\u7279\u6027\uff08\u6807\u51c6V.24\uff09\u3001\u8fc7\u7a0b\u7279\u6027<\/p>\n

\u8c03\u5236\u89e3\u8c03\u5668Modem\uff1a\u4fd7\u79f0\u201c\u732b\u201d\uff0c\u4f5c\u7528\u662f\u628a\u7535\u8bdd\u7ebf\u91cc\u9762\u7684\u6a21\u62df\u4fe1\u53f7\u548c\u6570\u5b57\u4fe1\u53f7\u4e92\u76f8\u8f6c\u6362\uff0cV.90\u6807\u51c6\u53ef\u8fbe\u523056kb\/s\u3002<\/p>\n

\u6570\u636e\u7ec8\u7aef\u8bbe\u5907DTE\uff0c\u5982\u7528\u6237\u7684\u8ba1\u7b97\u673a\u3001\u7535\u8bdd\u7b49\u3002<\/p>\n

\u6570\u636e\u7535\u8def\u8bbe\u5907DCE\uff0c\u5982\u8c03\u5236\u89e3\u8c03\u5668\u3002<\/p>\n

DTE\u548cDCE\u4e24\u7aef\u8981\u540c\u6b65\u3002<\/p>\n

\u4e09\u3001\u516c\u516c\u6570\u636e\u7f51X.25<\/h3>\n

X.25\u4f7f\u7528\u5206\u7ec4\u4ea4\u6362\uff0c\u5206\u4e3a\u4e09\u5c42\uff1a\u7269\u7406\u5c42\u3001\u94fe\u8def\u5c42\u3001\u5206\u7ec4\u5c42\u3002\u5bf9\u5e94\u4e8eOSI\u7684\u4f4e\u4e09\u5c42\u3002\u91c7\u7528\u865a\u62df\u7535\u8def\u3001\u9762\u5411\u8fde\u63a5\u7684\u3002\u91c7\u7528\u540e\u9000N\u5e27ARQ\u3001\u6ed1\u52a8\u7a97\u53e3\u9ed8\u8ba42\u3002<\/p>\n

\u6d41\u91cf\u63a7\u5236\u6280\u672f\uff1a\u534f\u8c03\u6536\u53d1\u7aef\u6d41\u91cf\u3002\u5047\u8bbe\u6ca1\u6709\u4f20\u8f93\u9519\u8bef\u7684\u6d41\u63a7\u6280\u672f\u3002<\/p>\n

\u505c\u7b49\u534f\u8bae\uff1a\u53d1\u9001\u4e00\u5e27\uff0c\u7b49\u5230\u5e94\u7b54\uff0c\u518d\u53d1\u9001\uff1b\u5982\u679c\u4e0d\u5e94\u7b54\uff0c\u4e00\u76f4\u7b49\u3002\u7c7b\u4f3c\u6392\u961f\u4e70\u996d\uff0c\u4e00\u4e2a\u4e00\u4e2a\u6253\u996d\u3002<\/p>\n

\u6d41\u91cf\u63a7\u5236\u6280\u672f\uff1a\u534f\u8c03\u6536\u53d1\u7aef\u6d41\u91cf\u3002\u5047\u8bbe\u6ca1\u6709\u4f20\u8f93\u9519\u8bef\u7684\u6d41\u63a7\u6280\u672f\u3002<\/p>\n

\u6ed1\u52a8\u7a97\u53e3\u534f\u8bae\uff1a\u8fde\u7eed\u53d1\u9001\u591a\u4e2a\u5e27\u800c\u65e0\u9700\u5e94\u7b54\u3002\u7c7b\u4f3c\u94f6\u884cATM\u673a\uff0c\u4e00\u6c93\u4e00\u6c93\u5b58\u94b1\u3002<\/p>\n

\u5dee\u9519\u63a7\u5236\u6280\u672f\uff1a\u68c0\u67e5\u548c\u7ea0\u6b63\u4f20\u8f93\u9519\u8bef\u3002<\/p>\n

1\uff09\u80af\u5b9a\u5e94\u7b54\uff1a\u6536\u5230\u80af\u5b9a\u5e94\u7b54\u4fe1\u53f7ACK\u7ee7\u7eed\u53d1\u9001\u3002<\/p>\n

2\uff09\u5426\u5b9a\u5e94\u7b54\u91cd\u53d1\uff1a\u6536\u5230\u5426\u5b9a\u5e94\u7b54\u4fe1\u53f7NAK\u91cd\u590d\u51fa\u9519\u5e27\u3002<\/p>\n

3\uff09\u8d85\u65f6\u91cd\u53d1\uff1a\u8d85\u8fc7\u89c4\u5b9a\u65f6\u95f4\u91cd\u53d1\u8be5\u5e27\uff0c\u8fd9\u79cd\u6280\u672f\u79f0\u4e3a\u81ea\u52a8\u8bf7\u6c42\u91cd\u53d1ARQ\u3002<\/p>\n

ARQ\u5206\u4e3a\u4e09\u79cd\uff1a\u505c\u7b49ARQ\u3001\u9009\u62e9\u91cd\u53d1ARQ\u3001\u540e\u9000N\u5e27ARQ\u3002<\/p>\n

\u505c\u7b49ARQ\uff1a\u662f\u505c\u7b49\u6d41\u63a7\u548cARQ\u7ed3\u5408\u3002<\/p>\n

\u9009\u62e9\u91cd\u53d1ARQ\uff1a\u662f\u6ed1\u52a8\u7a97\u53e3\u548cARQ\u7ed3\u5408\u3002<\/p>\n

\u540e\u9000N\u5e27ARQ\uff1a\u4e5f\u662f\u6ed1\u52a8\u7a97\u53e3\u548cARQ\u7ed3\u5408\u3002<\/p>\n

\u5404\u79cd\u6d41\u63a7\u548c\u5dee\u9519\u5229\u7528\u7387<\/p>\n

1\uff09\u5e38\u6570a\u503c\u7684\u8ba1\u7b97\uff1aa = (d\/v)\/(L\/R) = (RT)\/L = (Rd\/v)\/L<\/p>\n

\u5176\u4e2d\uff0cR\u4e3a\u6570\u636e\u901f\u7387\uff0cd\u4e3a\u7ebf\u8def\u957f\u5ea6\uff0cv\u4e3a\u4f20\u64ad\u901f\u5ea6\uff0cL\u4e3a\u5e27\u957f\uff0cT\u4e3a\u4f20\u64ad\u5ef6\u8fdf\u3002<\/p>\n

2\uff09\u6548\u7387E\u503c\u7684\u8ba1\u7b97\uff1a<\/p>\n

\u505c\u7b49\u534f\u8bae\uff1aE = 1\/(2a+1)<\/p>\n

\u6ed1\u52a8\u7a97\u53e3\uff1aE = W\/(2a+1)<\/p>\n

3\uff09\u7a97\u53e3W\u503c\u7684\u8ba1\u7b97\uff1a<\/p>\n

\u9009\u62e9ARQ\uff1a<\/p>\n

\u540e\u9000ARQ\uff1a<\/p>\n

\u9ad8\u7ea7\u6570\u636e\u94fe\u8def\u63a7\u5236\u534f\u8baeHDLC\uff1a\u9762\u5411\u6bd4\u7279\u7684\u3002\u901a\u5e38\u4f7f\u7528CRC-16\u3001CRC-32\u6821\u9a8c\u3002\u5e27\u8fb9\u754c 01111110 \u3002\u7528\u6237\u6570\u636e\u5b57\u6bb5INFO\u5927\u5c0f\u4e0d\u56fa\u5b9a\u3002<\/p>\n

\u56db\u3001\u5e27\u4e2d\u7ee7\u7f51FR<\/h3>\n

\u5e27\u4e2d\u7ee7FR\u662fX.25\u6f14\u53d8\u6539\u8fdb\u7684\u3002<\/p>\n

1\uff09\u5de5\u4f5c\u5728OSI\u7684\u4f4e\u4e24\u5c42\uff0c\u5373\u7269\u7406\u5c42\u548c\u94fe\u8def\u5c42\u3002<\/p>\n

2\uff09\u5728\u7b2c\u4e8c\u5c42\u5efa\u7acb\u865a\u7535\u8def\uff08\u4e0eX.25\u4e00\u6837\uff0c\u4e5f\u652f\u6301\u6c38\u4e45\u865a\u7535\u8defPVC\u548c\u4ea4\u6362\u865a\u7535\u8defSVC\uff09\uff0c\u627f\u8f7d\u6570\u636e\u4e1a\u52a1\uff0c\u56e0\u800c\u7b2c\u4e09\u5c42\u88ab\u7b80\u5316\u62c9\u3002\u4e5f\u662f\u5206\u7ec4\u4ea4\u6362\u3002<\/p>\n

3\uff09FR\u53ea\u505a\u68c0\u9519\uff0c\u4e0d\u5728\u91cd\u4f20\uff0c\u6ca1\u6709\u6d41\u63a7\uff0c\u53ea\u6709\u62e5\u585e\u63a7\u5236\uff0c\u68c0\u9519\u4ea4\u9ad8\u5c42\u3002<\/p>\n

\u5e27\u4e2d\u7ee7\u4e3b\u8981\u4f18\u70b9\uff1a<\/p>\n

1\uff09\u57fa\u4e8e\u5206\u7ec4\uff08\u5e27\uff09\u4ea4\u6362\u7684\u900f\u660e\u4f20\u8f93\uff0c\u53ef\u63d0\u4f9b\u9762\u5411\u8fde\u63a5\u7684\u670d\u52a1\u3002<\/p>\n

2\uff09\u5e27\u957f\u53ef\u53d8\uff0c\u957f\u5ea6\u53ef\u8fbe1600~4096\u5b57\u8282\uff0c\u53ef\u4ee5\u627f\u8f7d\u5404\u79cd\u5c40\u57df\u7f51\u7684\u6570\u636e\u5e27\u3002<\/p>\n

3\uff09\u6570\u636e\u901f\u7387\u53ef\u8fbe2~45Mbps.<\/p>\n

4\uff09\u65e2\u53ef\u4ee5\u6309\u9700\u8981\u63d0\u4f9b\u5e26\u5bbd\uff0c\u4e5f\u53ef\u4ee5\u5e94\u4ed8\u7a81\u53d1\u7684\u6570\u636e\u4f20\u8f93\u3002<\/p>\n

5\uff09\u6ca1\u6709\u6d41\u91cf\u548c\u91cd\u4f20\u673a\u5236\uff0c\u5f00\u9500\u5f88\u5c11\u3002<\/p>\n

\u4e94\u3001\u7efc\u5408\u4e1a\u52a1\u6570\u636e\u7f51ISDN<\/h3>\n

\u7efc\u5408\u4e1a\u52a1\u6570\u636e\u7f51ISDN\uff1a\u57fa\u4e8e\u7535\u8def\u4ea4\u6362\uff0c\u628a\u6570\u636e\u3001\u58f0\u97f3\u3001\u89c6\u9891\u4fe1\u53f7\u4e09\u5408\u4e00\u4f20\u8f93\u3002<\/p>\n

ISDN\u4e24\u79cd\u901f\u7387\uff1a<\/p>\n

\u57fa\u672c\uff08N-ISDN\uff09\u901f\u7387BRI\uff082B+D\uff092B+D = 2*64+16 = 144kb\/s<\/p>\n

\u57fa\u7fa4\uff08B-ISDN\uff09\u901f\u7387PRI\uff0830B+D\uff0930B+D = 30*64+64 = 1.984Mb\/s<\/p>\n

B\u4fe1\u9053\u6570\u636e\u4fe1\u9053\uff1bD\u4fe1\u9053\u63a7\u5236\u4fe1\u9053\u3002<\/p>\n

\u516d\u3001\u5f02\u6b65\u4f20\u8f93\u6a21\u5f0fATM<\/h3>\n

\u5f02\u6b65\u4f20\u8f93\u6a21\u5f0fATM\uff1a\u6700\u65e9\u662fB-ISDN\u6807\u51c6\u7684\u4e00\u90e8\u5206\uff0c\u5206\u4e3a\u56db\u5c42\u6a21\u578b\uff0c\u5982\u4e0b\u8868\u3002<\/p>\n

ATM\u91c7\u752853(48+5)\u5b57\u8282\u4fe1\u5143\u5206\u7ec4\u4ea4\u6362\uff0c\u4f7f\u7528\u7edf\u8ba1\u65f6\u5206TDM\u3002\u91c7\u7528\u53cc\u7ede\u7ebf\u6216\u5149\u7ea4\uff0c\u5178\u578b\u6570\u636e\u901f\u7387155M\uff0c\u9762\u5411\u8fde\u63a5\uff0c\u4f7f\u7528\u865a\u7535\u8def\u7684\u865a\u901a\u8defVPI\u548c\u865a\u4fe1\u9053VCI\u3002<\/p>\n

\u53c2\u8003\uff1a<\/p>\n

\u7f51\u7edc\u5de5\u7a0b\u5e08\u7ecf\u9a8c\u5206\u4eab\u4e4b\u5e7f\u57df\u901a\u4fe1\u7f51<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

\u7b2c\u4e09\u7ae0\u5e7f\u57df\u901a\u4fe1\u7f51\u76ee\u5f55 3.1\u516c\u5171\u4ea4\u6362\u7535\u8bdd\u7f51 3.1.1\u7535\u8bdd\u7cfb\u7edf\u7684\u7ed3\u6784 3.1.2 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,3],"tags":[32],"class_list":["post-227","post","type-post","status-publish","format-standard","hentry","category-39","category-3","tag-32"],"_links":{"self":[{"href":"https:\/\/www.jayjaydream.com\/index.php?rest_route=\/wp\/v2\/posts\/227","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jayjaydream.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jayjaydream.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jayjaydream.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jayjaydream.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=227"}],"version-history":[{"count":8,"href":"https:\/\/www.jayjaydream.com\/index.php?rest_route=\/wp\/v2\/posts\/227\/revisions"}],"predecessor-version":[{"id":520,"href":"https:\/\/www.jayjaydream.com\/index.php?rest_route=\/wp\/v2\/posts\/227\/revisions\/520"}],"wp:attachment":[{"href":"https:\/\/www.jayjaydream.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=227"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jayjaydream.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=227"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jayjaydream.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=227"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}