{"id":841,"date":"2008-07-04T20:20:00","date_gmt":"2008-07-04T12:20:00","guid":{"rendered":"http:\/\/note.systw.net\/note\/?p=841"},"modified":"2023-11-06T20:24:04","modified_gmt":"2023-11-06T12:24:04","slug":"lastmile-cablenetwork","status":"publish","type":"post","link":"https:\/\/systw.net\/note\/archives\/841","title":{"rendered":"LastMile CableNetwork"},"content":{"rendered":"\n

community antenna television(\u793e\u5340\u5929\u7dda\u96fb\u8996)<\/strong>
\u65e9\u671f\u6709\u7dda\u96fb\u8996,\u4f7f\u7528\u5927\u578b\u5929\u7dda,\u8a0a\u865f\u653e\u5927\u5668(headend,\u982d\u7aef)\u53ca\u540c\u8ef8\u96fb\u7e9c(\u9023\u81f3\u5404\u5bb6\u4e2d)<\/p>\n\n\n\n

CATV(Cable Television,\u6709\u7dda\u96fb\u8996\u4e0a\u7db2)<\/strong>
\u4ee5\u540c\u8ef8\u96fb\u7e9c\u505a\u5a92\u4ecb,\u5206\u983b\u591a\u5de5,\u9700\u4e00\u5c0dcable modem(\u7528\u6236\u7aef,\u6a5f\u623f\u7aef)\u4e26\u8abf\u81f3\u76f8\u540c\u8f09\u6ce2\u983b\u9053
\u591a\u7528\u6236\u6703\u5171\u4eab\u55ae\u4e00\u7dda\u8def:frequencies over shared cable distribution network<\/p>\n\n\n\n

\u50b3\u7d71catv:<\/strong>
\u53ea\u80fd\u63d0\u4f9b\u4e0b\u8f09\u65b9\u5411\u50b3\u905e,\u7121\u6cd5\u63d0\u4f9b\u96d9\u5411\u7684\u6578\u4f4d\u901a\u4fe1
\u4f4e\u6210\u672c\u89e3\u6c7a\u65b9\u6848:dual path(\u96d9\u8def),\u4e0a\u50b3\u6642\u7d93\u96fb\u8a71\u64ad\u63a5,\u7528\u6236\u7aef\u786c\u9ad4\u9808\u63a5\u96fb\u7e9c\u6578\u64da\u6a5f\u53ca\u96fb\u8a71\u64a5\u63a5\u6578\u64da\u6a5f(\u64a5\u63a5\u6210\u529f\u5f8c\u5373\u53ef\u4e0a\u50b3\u5c01\u5305)<\/p>\n\n\n\n

HFC(hybrid fiber coax,\u6df7\u5408fiber\u540c\u8ef8\u7db2\u8def\u7cfb\u7d71)<\/strong>
\u5728fiber\u4e0a\u57f7\u884c\u9577\u9014\u50b3\u8f38\u4e26\u4ee5\u540c\u8ef8\u96fb\u7e9c\u63a5\u9032\u7528\u6236\u5bb6\u4e2d\u7684\u7cfb\u7d71
\u4f7f\u7528fiber mode(electro-optical converter\u5149\u96fb\u8f49\u63db\u5668)\u4ecb\u63a5fiber\u548c\u7cfb\u7d71\u96fb\u5b50
\u7528\u65bc\u96fb\u8996\u5ee3\u64ad\u4e0d\u53d7\u5f71\u97ff,\u4f46\u7db2\u969b\u7db2\u8def\u5b58\u53d6\u6703\u5f71\u97ff\u983b\u5bec
\u89e3\u6c7a\u65b9\u6cd5\uff1a\u5c07\u9577\u7e9c\u7dda\u5207\u5206\u958b\u4f86,\u4e26\u76f4\u9023\u4e00\u500bfiber\u7bc0\u9ede,\u82e5\u4f7f\u7528\u8005\u4e0d\u8981\u592a\u591a\u53ef\u6539\u5584,\u82e5\u8ca0\u8f09\u904e\u91cd\u9808\u9032\u4e00\u6b65\u5206\u5272\u7e9c\u7dda\u4e26\u589e\u52a0fiber\u7bc0\u9ede<\/p>\n\n\n\n

… <\/p>\n\n\n\n


\u96fb\u8996\u5ee3\u64ad\u548c\u7db2\u969b\u7db2\u8def\u4e26\u5b58\u65bc\u540c\u4e00\u96fb\u7e9c\u4e0a\u65b9\u6cd5

\u4e0a\u884c\u983b\u7387<\/strong>
5-42mhz\u4e0a\u884c\u8cc7\u6599
\u4f7f\u7528QPSK,\u56e0\u5730\u9762\u5fae\u6ce2\u5e72\u64fe\u592a\u591a,\u9700\u63a1\u8f03\u4fdd\u5b88\u505a\u6cd5

\u4e0b\u884c\u983b\u7387(\u985e\u6bd4\u4e0b\u50b350-550MHz)<\/strong>
54-88mhz tv
88-108mhz fM
108-550mhz tv
550-750mhz \u4e0b\u884c\u8cc7\u6599\u4ee5\u6bcf6-8mhz\u4ee5\u4e0b\u4ee5QAM-64\u8abf\u8b8a(\u6de8\u8cc7\u6599\u8ca0\u8f09\u7d0427mbps)\u6216QAM-256\u8abf\u8b8a(\u6de8\u8cc7\u6599\u8ca0\u8f09\u7d0439mbps)

headend(\u982d\u7aef)\u6539\u6210<\/strong>CMTS(cable modem termination system,\u7e9c\u7dda\u6578\u64da\u6a5f\u7d42\u7aef\u7cfb\u7d71)<\/strong>
\u63d0\u4f9b\u5bb6\u5ead\u6216\u4f01\u696d\u7528\u6236\u9ad8\u901f\u7684\u7db2\u969b\u7db2\u8def\u5b58\u53d6,\u8a9e\u97f3\u4ee5\u53ca\u5176\u4ed6\u7684\u7db2\u8def\u670d\u52d9
\u5b89\u88dd\u5728\u6709\u7dda\u96fb\u8996\u516c\u53f8\u5206\u914d\u4e2d\u5fc3\u7684\u5167\u90e8,\u63a5\u6536\u4f86\u81eaInternet\u7684\u8cc7\u6599\u4e26\u50b3\u905e\u5230\u6df7\u5408\u5668\uff0c\u5728\u7d93\u7531\u6df7\u5408\u5668\u9001\u5230\u7528\u6236
CMTS\u4e5f\u63a5\u6536\u4f86\u81ea\u7528\u6236\u7684\u8cc7\u6599\u4e26\u50b3\u905e\u5230Internet
ex:cisco ubr7100\u842c\u7528\u5bec\u983b\u8def\u7531\u5668<\/p>\n\n\n\n

… <\/p>\n\n\n\n


\u7db2\u8def\u5b58\u53d6\u6642\u9700\u900f\u904ecable modem(\u7e9c\u7dda\u6578\u64da\u6a5f)<\/strong>
\u8abf\u8b8a\u65b9\u5f0f:QAM(Quadrature Amplitude Modulation,\u6b63\u4ea4\u632f\u5e45\u8abf\u8b8a)\u3001\u5728\u6700\u5c0f\u7684\u7a7a\u9593\u653e\u5165\u66f4\u591a\u4f4d\u5143
\u8abf\u8b8a\u7fa4\u7d44\u7b49\u7d1a16\u300164\u3001256-QAM(\u6263FEC\u8fd4\u8ff4\u932f\u8aa4\u4fee\u6b63\u7528\u9829\u5bec\uff0c\u80fd\u651c\u8f09\u901f\u5ea6\u7d0436Mbps)

cable modem<\/strong>\u6a19\u6e96:<\/strong>
DOCSIS(data over cable service interface specification,\u96fb\u89bd\u6578\u64da\u670d\u52d9\u4ecb\u9762\u898f\u7bc4)
ps:docsis\u6b50\u6d32\u7248\u7a31\u70baeurodocsis
\u6b50\u6d32DVB\/DAVIC(DVB-RCC\u6216ETS 300 800)
\u7f8e\u570bMCNS\/DOCSIS
IEEE802.14(DOCSIS 1.2)<\/p>\n\n\n\n

………………<\/p>\n\n\n\n

PacketCable(\u5c01\u5305\u8ef8\u7e9c)<\/strong>:\u4ee5MGCP\u70ba\u57fa\u790e\u7684\u4e00\u7a2e\u5bec\u983b\u8996\u8a0a\u96fb\u8a71
\u7531CableLabs\u516c\u53f8\u4e3b\u5c0e\u7684\u8a08\u5283\uff0c\u662f\u4ee5\u539f\u6709DOCSIS1.1\u7248\u7684\u8ef8\u7e9c\u670d\u52d9\u754c\u9762\u70ba\u57fa\u5e95\uff0c\u914d\u5408\u4e0a\u5c64\u4e4b\u7db2\u969b\u7db2\u8def\u5354\u5b9aip\u53ca\u5176\u4ed6\u76f8\u95dc\u7684\u5354\u5b9a\u8207\u6a5f\u5236\uff0c\u4f86\u9054\u5230\u5728\u8ef8\u7e9c\u7cfb\u7d71\u4e0a\u4f5cTelecommunication Service(\u96fb\u4fe1\u670d\u52d9)\u7684\u76ee\u7684
\u76ee\u524d\u5171\u5206\u6210PacketCable 1.0\u7248,1.1\u7248,1.2\u7248,2.0\u7248,…\u7b49,\u5404\u7248\u672c\u7686\u6709\u5176\u65e2\u5b9a\u76ee\u6a19<\/p>\n\n\n\n

\u53ef\u5206\u70baUser Side(\u7528\u6236\u7aef)\u8207\u7cfb\u7d71\u982d\u7aef\u7684\u8a2d\u5099<\/strong>
User Side\u65b9\u9762:\u6709\u4e00\u500b\u4ecb\u65bc\u8ef8\u7e9c\u6578\u64da\u6a5f\u8207\u7d42\u7aef\u9ede(\u53ef\u4ee5\u662f\u500b\u4eba\u96fb\u8166\u3001\u5bb6\u7528\u96fb\u8a71\u3001\u651d\u5f71\u6a5f\u6216\u96fb\u8996\u6a5f)\u7684\u8a2d\u5099\uff0c\u7a31\u4e4b\u70baMTA(Multimedia Terminal Adapter,\u591a\u5a92\u9ad4\u7d42\u7aef\u5668)\u6216RW(Residential Gateway,\u5bb6\u7528\u9598\u9053\u5668) 
\u5176\u76ee\u7684\u662f\u7528\u4f86\u505a\u8a0a\u865f\u8207\u901a\u8a0a\u5354\u5b9a\u8f49\u63db\u4e4b\u7528\uff0c\u8b93\u4f7f\u7528\u8005\u4e0d\u9700\u505a\u4efb\u4f55\u52d5\u4f5c\uff0c\u5373\u53ef\u8f15\u6613\u7684\u900f\u904e\u8ef8\u7e9c\u7cfb\u7d71\u6253\u96fb\u8a71
\u5176\u4e2dMTA-I\u53ea\u63d0\u4f9bVoice\u529f\u80fd\uff0c\u800cMTA -II\u5247\u63d0\u4f9bVoice\/Video\u529f\u80fd\u3002
\u5305\u62ecMSO(Multiple System Operators,\u591a\u91cd\u7cfb\u7d71\u696d\u8005)\u6240\u9700\u6295\u8cc7\u7684\u8a2d\u5099\uff0c\u5982\u6b64\u624d\u80fd\u9054\u5230\u8207PSTN\u4e92\u9023\u7684\u76ee\u7684<\/p>\n\n\n\n

PacketCable\u7684\u4e3b\u8981\u76ee\u7684<\/strong>
\u516c\u51432000\u5e74\u5c31\u6709\u5546\u696d\u5316\u7684\u7522\u54c1\u51fa\u73fe
\u7528\u6236\u7aef\u8207\u90e8\u5206\u5c40\u7aef\u529f\u80fd\u7684\u670d\u52d9
\u8ef8\u7e9c\u7db2\u8def\u7cfb\u7d71\u5167(Local On-Net)\u4e92\u76f8\u901a\u8a0a\u8207\u6253\u96fb\u8a71\u5230\u516c\u773e\u96fb\u4fe1\u7db2(On-Net to PSTN)
Network-Based Call Signaling(\u96c6\u4e2d\u5f0f\u9023\u7dda\u6a21\u5f0f)
Dynamic QoS(\u52d5\u614b\u5f0f\u670d\u52d9\u54c1\u8cea)
\u53ef\u4ee5\u53d6\u4ee3\u50b3\u7d71\u96fb\u8a71\u800c\u6210\u70ba\u5bb6\u88e1\u4e3b\u8981\u7684\u96fb\u8a71\u901a\u8a0a
\u52a0\u5f37\u4fdd\u5bc6\u529f\u80fd\u2027IP Address Privacy(IP\u4f4d\u5740\u4fdd\u5bc6)
Client-Based Call Signaling(\u5206\u6563\u5f0f\u9023\u7dda\u6a21\u5f0f)
MCU(Multipoint Control Unit,\u5229\u7528\u591a\u9ede\u63a7\u5236\u55ae\u5143),\u4f86\u9054\u5230\u591a\u65b9\u6703\u8b70\u7684\u76ee\u7684
\u63d0\u4f9bDomain-to-Domain(\u8de8\u9818\u57df)\u901a\u8a71<\/p>\n","protected":false},"excerpt":{"rendered":"

community antenna television(\u793e …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[28],"tags":[],"class_list":["post-841","post","type-post","status-publish","format-standard","hentry","category-wan"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/841","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/comments?post=841"}],"version-history":[{"count":0,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/841\/revisions"}],"wp:attachment":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/media?parent=841"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/categories?post=841"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/tags?post=841"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}