WAN(wide area network,\u5ee3\u57df\u7db2\u8def)
\u8de8\u8d8a\u5ee3\u5927\u5730\u7406\u5340\u57df\u7bc4\u570d\u7684\u6578\u64da\u901a\u8a0a\u7db2\u8def
\u4e3b\u8981\u904b\u4f5c\u5728osi1,2\u5c64\u4e2d
\u53ef\u5c07\u5206\u6563\u5728\u9060\u8655\u7684lan\u9023\u7d50\u8d77\u4f86
\u9060\u7aef\u4e09\u9ede:\u6162,\u8cb4,\u4e0d\u7a69 <\/p>\n\n\n\n
\u53ef\u7528\u5728WAN\u6280\u8853\u6709
\u6b50\u898fGSM(Global System for Mobile Comm),\u6709900\/1800\/1900MHz
GPRS(General Packet Radio Service,\u6574\u5408\u5c01\u5305\u7121\u7dda\u96fb\u670d\u52d9)
PSTN(Public Switched Telephone Network,\u516c\u773e\u4ea4\u63db\u96fb\u8a71\u7db2\u8def),\u96fb\u8a71,\u6578\u64da\u6a5fModem (56\/64 kbps)
pots(\u50b3\u7d71\u820a\u5f0f\u96fb\u8a71\u670d\u52d9)
Leased Line(\u5c08\u7dda): T1 (1.5 Mbps), E1 (2 Mbps), T3 (45 Mbps )
ISDN(Integrated Service Digital Network, \u6574\u9ad4\u670d\u52d9\u6578\u4f4d\u7db2\u8def)
B-ISDN(Broadband-ISDN,\u5bec\u983b-\u6574\u9ad4\u670d\u52d9\u6578\u4f4d\u7db2\u8def)
X.25,Frame Relay
ATM(Asynchronous Transfer Mode,\u975e\u540c\u6b65\u50b3\u8f38\u6a21\u5f0f)
Cable TV Network(\u6709\u7dda\u96fb\u8996\u7db2\u8def)
IN(Intelligent Network,\u667a\u6167\u578b\u7db2\u8def)
xDSL(Digital Subscriber Line,\u6578\u4f4d\u7528\u6236\u8ff4\u8def):ADSL
SMDS(\u767e\u842c\u4f4d\u5143\u4ea4\u63db\u7b49\u7d1a\u6578\u64da\u670d\u52d9)
MMDS(multichannel multipoint distribution service,\u591a\u901a\u9053\u591a\u9ede\u5206\u6563\u5f0f\u670d\u52d9):198mhz,\u7bc4\u570d\u7d0450\u516c\u91cc,\u7a7f\u900f\u529b\u4f73,\u88ab\u8996\u70ba\u4e00\u7a2eMAN
LMDS(local multipoint distribution service,\u5340\u57df\u591a\u9ede\u5206\u6563\u670d\u52d9):1.3ghz\u7684\u7121\u7dda\u5340\u57df\u8ff4\u8def\u670d\u52d9,\u7bc4\u570d25\u516c\u91cc,\u4e0b\u884c36gbps\u4e0a\u884c1mbps
ps:mmds,lmds\u70bawimax\u7684\u524d\u8eab<\/p>\n\n\n\n
………………………….<\/p>\n\n\n\n
wan\u7684\u9023\u7dda\u985e\u578b\uff1a
leased line(\u5c08\u7dda):\u4f7f\u7528\u540c\u6b65\u5e8f\u5217\u4ecb\u9762
\u3000\u4e0d\u8003\u616e\u6210\u672c\u6642\u662f\u6700\u597d\u7684\u9078\u64c7,\u901a\u5e38\u4f7f\u7528hdlc,ppp,slip,…
\u4ea4\u63db\u6280\u8853
\u3000circit switched(\u96fb\u8def\u4ea4\u63db):\u4f7f\u7528\u975e\u540c\u6b65\u5e8f\u5217\u4ecb\u9762
\u3000\u6210\u672c\u8f03\u4f4e,\u53ea\u9700\u70ba\u771f\u6b63\u4f54\u7528\u7684\u6642\u9593\u4ed8\u8cbb,\u5728\u5efa\u7acb\u9023\u7dda\u524d\u4e0d\u53ef\u50b3\u8f38\u8cc7\u6599,\u901a\u5e38\u4f7f\u7528isdn\u6216\u64a5\u865f\u6578\u64da\u6a5f,…
\u3000packet switched(\u5206\u5c01\u4ea4\u63db):\u4f7f\u7528\u540c\u6b65\u5e8f\u5217\u4ecb\u9762
\u3000\u6210\u672c\u8f03\u4f4e,\u5141\u8a31\u548c\u5176\u4ed6\u7528\u6236\u5171\u7528\u983b\u5bec\u7bc0\u7701\u8cc7\u91d1,\u901a\u5e38\u4f7f\u7528x.25,frame-relay,atm,… <\/p>\n\n\n\n
\u5e38\u7528\u540d\u8a5e
cpe(customer premises equipment,\u5ba2\u6236\u524d\u7aef\u8a2d\u5099):\u5728\u7528\u6236\u7aef\u5834\u6240\u7684\u88dd\u7f6e
demarcation point(\u8cac\u4efb\u5206\u754c\u9ede):last mile\u8207cpe\u4e4b\u9593\u7684\u9ede
local Loop(\u5340\u57df\u8ff4\u8def)\/last mile(\u6700\u5f8c\u4e00\u54e9):CPE\u5230\u96e2isp\u6700\u8fd1\u7684co\u9019\u6bb5\u8ddd\u96e2,\u505a\u70baisp\u8207\u500b\u4eba\u7528\u6236\u4e4b\u9593\u7684\u9023\u7dda
\u5927\u90e8\u4efd\u4f7f\u7528\u985e\u6bd4\u7684\u8a0a\u865f,\u56e0\u70ba\u5b83\u5011\u662f\u5728\u50b3\u7d71\u985e\u6bd4\u5f0f\u96fb\u8a71\u670d\u52d9\u6240\u5efa\u7dda\u8def
WLL(wireless local loop,\u7121\u7dda\u5340\u57df\u8ff4\u8def):\u5c07\u7528\u6236\u7aef\u9023\u63a5\u5230\u7d42\u7aef\u5c40\u7684\u4e00\u7a2e\u65b9\u6cd5,1988\u958b\u59cb\u71df\u904b
exchange(\u4ea4\u63db\u9ede)\/co(central office,\u4e2d\u592e\u6a5f\u623f)\/pop(point of presence):isp\u7528\u4f86\u9023\u7d50\u5404cpe\u7684\u9ede
toll network(\u9577\u9014\u7db2\u8def):isp\u7684\u7db2\u8def<\/p>\n\n\n\n
wan\u4e2d\u6240\u4f7f\u7528\u7684\u8a2d\u5099\u5305\u542b:
router
siwtch,ex:frame relay switch(\u8a0a\u6846\u4e2d\u7e7c\u4ea4\u63db\u5668),atm switch,co(central office)
modem,ex:csu\/dsu\u4ecb\u9762,isdn\u7684tas\/nt1s\u4ecb\u9762
communication server(\u901a\u8a0a\u4f3a\u670d\u5668):\u96c6\u4e2d\u5f0f\u64a5\u5165\u8207\u64a5\u51fa\u7684\u4f7f\u7528\u8005\u901a\u8a0awan\u5e38\u7528\u754c\u9762\u6709:
serial:\u652f\u63f4cisco hdlc,ppp,frame relay
RJ-45,\u652f\u63f4ISDN bri(with ppp)
RJ-11,\u652f\u63f4DSL modem
F(works over cable tv line),\u652f\u63f4cable modem<\/p>\n\n\n\n
DTE\/DCE\u4ecb\u9762
DTE(data terminal equipment,\u8cc7\u6599\u7d42\u7aef\u8a2d\u5099):
router\u9810\u8a2d\u4ecb\u9762
\u7528\u4f86\u76f4\u63a5\u9023\u5230\u670d\u52d9\u63d0\u4f9b\u8005\u6216DCE\u76f8\u9023,\u4e14\u9700\u8981\u4f7f\u7528DTE\u7e9c\u7dda\u9032\u884c\u9023\u63a5
WAN\u9023\u7d50\u4e0a\u4f7f\u7528\u8005\u8a2d\u5099\u7684\u7aef\u9ede
\u4e8c\u9032\u4f4d\u6578\u4f4d\u8cc7\u6599\u7684\u4f86\u6e90\u6216\u76ee\u5730,ex:\u96fb\u8166,\u7d42\u7aef\u6a5f,\u5370\u8868\u6a5f…
DCE(data circuit terminating equipment,\u8cc7\u6599\u96fb\u8def\u7d42\u7aef\u8a2d\u5099):
\u5728serial(\u5e8f\u5217)\u4ecb\u9762\u4e0b\u63d0\u4f9b\u8a0a\u865fclocking rate(\u6642\u8108\u983b\u7387)\u7684\u88dd\u7f6e,ex:DSU\/CSU
\u5c07\u4f86\u81eaDTE\u7684\u8cc7\u6599\u8f49\u63db\u6210\u63d0\u4f9bWAN\u670d\u52d9\u8a2d\u5099\u53ef\u63a5\u53d7\u7684\u5f62\u5f0f
\u63a5\u8fd1\u7db2\u8def,\u50b3\u8f38\u6216\u63a5\u6536\u985e\u6bd4,\u6578\u4f4d\u8a0a\u865f\u8cc7\u6599\u7684\u8a2d\u5099,ex:\u6578\u64da\u6a5f,frame-relay switchserial\u4ecb\u9762\u6709:
EIA\/TIA-232(\u524d\u8eab\u70baRS232):\u898f\u683c\u6709DB25\u548cDB9,\u7528NRZ-Z\u7de8\u78bc\u50b3\u8f38
EIA\/TIA-449:\u898f\u683c\u70baDB37\u53caDB9,\u96fb\u529b\u898f\u683c\u70baRS423(\u975e\u5e73\u8861\u5f0f\u50b3\u8f38),RS422(\u5e73\u8861\u5f0f\u50b3\u8f38),\u8f03\u5feb\u7684EIA\/TIA-232\u7248\u672c,\u652f\u63f4\u8f03\u9577\u7684\u7e9c\u7dda\u8ddd\u96e2,\u53ef\u90542mbps
EIA530:\u898f\u683c\u70baDB25(DB25\u7248\u7684EIA449)
V.24:\u8207EIA\/TIA-232\u76f8\u540c
X.21:\u898f\u683c\u70baDB15,\u65bc\u540c\u6b65\u6578\u4f4d\u7dda\u8def\u4e0a\u4e4b\u4e32\u5217\u901a\u8a0a\u5354\u5b9a,\u4e3b\u7528\u65bc\u6b50\u6d32\u53ca\u65e5\u672c
V.35:\u65bc\u7db2\u8def\u5b58\u53d6\u8a2d\u5099\u53ca\u5c01\u5305\u7db2\u8def\u9593\u901a\u8a0a\u7528\u7684\u540c\u6b65\u5be6\u9ad4\u5c64\u5354\u5b9a,\u4e3b\u7528\u5728\u7f8e\u570b\u53ca\u6b50\u6d32,\u652f\u63f42mbps\u4ee5\u4e0a
G.703:ITU-T\u96fb\u6c23\u8207\u6a5f\u68b0\u898f\u7bc4,\u4f7f\u7528BNC\u9023\u63a5\u5668\u4e26\u4ee5E1\u901f\u7387\u50b3\u8f38
HSSI(high speed serial interface,\u9ad8\u901f\u5e8f\u5217\u4ecb\u9762)
ps:
\u6240\u6709\u7684wan\u90fd\u7528serial transmission(\u5e8f\u5217\u50b3\u8f38),\u4e26\u7528serial connector
serial transmission\u4e00\u6b21\u50b31bit,\u5e73\u884c\u50b3\u8f38\u4e00\u6b21\u50b38bit<\/p>\n\n\n\n
DSU\/CSU
\u8ca0\u8cac\u96fb\u8a71\u7cfb\u7d71\u8207\u96fb\u8166\u9593\u6578\u4f4d\u6a19\u6e96\u7684\u8f49\u63db\u8a2d\u5099,\u79df\u7528\u6578\u4f4d\u7dda\u8def\u5169\u7ad9\u7686\u9700\u4e00\u500bDSU\/CSU
DSU(data service unit,\u8cc7\u6599\u670d\u52d9\u55ae\u5143)
\u5305\u542b\u53bb\u9069\u61c9\u5404\u7a2e\u7531\u5149\u96fb\u7a81\u7136\u7522\u751f\u7684\u80fd\u91cf\u548c\u5176\u4ed6\u96fb\u78c1\u5e72\u63f4\u7684\u8655\u7406\u96fb\u8def,\u53ca\u5075\u6e2c\u53e6\u4e00\u7aefDSU\/CSU\u662f\u5426\u6b63\u5e38\u7684\u96fb\u8def
\u63d0\u4f9b\u8ff4\u8f49loopback\u7684\u529f\u80fd\u4f9b\u5b89\u88dd\u6642\u6e2c\u8a66\u96fb\u8def\u7528
CSU(channel service unit,\u901a\u9053\u670d\u52d9\u55ae\u5143)
\u5c07\u8cc7\u6599\u5728\u8f09\u6ce2\u7dda\u8def\u8207\u96fb\u8166\u8a2d\u5099\u9593\u505a\u6578\u4f4d\u683c\u5f0f\u7684\u8f49\u63db\u5de5\u4f5c
\u4ecb\u9762\u8996\u7dda\u8def\u7684\u904b\u4f5c\u901f\u7387\u800c\u5b9a,\u5c0f\u65bc56K\u5247\u7528RS232,\u8d85\u904e\u5247\u7528RS449\u6216V.35
ps:dsl,isdn,\u7121\u7dda\u7db2\u8def,pots\u90fd\u4e0d\u80fd\u4f7f\u7528dsu\/csu<\/p>\n\n\n\n
………………………………………………………….<\/p>\n\n\n\n
\u5e38\u898b\u7db2\u8def\u6709:
stub network(\u55ae\u4e00\u7db2\u8def)
\u53ea\u6709\u4e00\u689d\u8def\u5f91\u901a\u5230\u5916\u9762\u7684\u7db2\u8def,\u4e00\u822c\u7686\u662f,\u7121\u6cd5\u8f49\u8f09\u6d41\u91cf
\u5728\u8def\u7531\u8868\u4e0a\u76ee\u6a19\u7db2\u8def\u901a\u5e38\u8a2d0000,\u8868\u793a\u672a\u77e5\u4f4d\u7f6e\u4e00\u5f8b\u5f80\u6b64\u9001
\u9069\u5408\u4f7f\u7528static routing
milticonnected network(\u591a\u9023\u7d50\u7db2\u8def)
\u9664\u975e\u88ab\u62d2\u7d55,\u5426\u5247\u53ef\u7528\u4f86\u8f49\u8f09\u6d41\u91cf
transit network(\u904e\u5883\u7db2\u8def)
\u8def\u7531\u5668\u9593\u7684\u9023\u7dda
\u5982\u9aa8\u5e79\u7db2\u8def,\u53ef\u8655\u7406\u7b2c\u4e09\u8005\u7684\u5c01\u5305,\u4f46\u591a\u5c11\u6709\u9650\u5236
NBMA(Nonbroadcast multi-access,\u975e\u5ee3\u64ad\u5f0f\u591a\u91cd\u5b58\u53d6)
\u5929\u751f\u7f3a\u4e4f\u5ee3\u64ad\u8207\u7fa4\u64ad\u7684\u80fd\u529b,ex,frame relay,x.25,atm
\u6b64\u9023\u7dda\u985e\u578b\u548c\u4e00\u822c\u5ee3\u64ad\u7db2\u8def\u74b0\u5883(\u4f8b\u5982ethernet)\u985e\u4f3c\uff0c\u5dee\u5225\u53ea\u5728\u65bc\u6240\u6709router\u90fd\u4f4d\u65bc\u540c\u6a23\u7684\u5b50\u7db2\u8def\u4e4b\u4e2d
\u56e0\u6210\u672c\u8003\u91cf,nbma\u7db2\u8def\u901a\u5e38\u4f4d\u65bcHub-and-spoke\u7684\u7db2\u8def\u62d3\u64b2\u4e4b\u4e2d
Broadcast multi-access(\u5ee3\u64ad\u591a\u91cd\u5b58\u53d6),ex:ethernet
point-to-point network(\u9ede\u5c0d\u9ede\u7db2\u8def),ex:ppp
point-to-multipoint network(\u9ede\u5c0d\u591a\u9ede\u7db2\u8def)
ps:\u4e00\u7db2\u8def\u53ea\u6709\u5169\u8a2d\u5099\u76f8\u9023\u4e26\u4e0d\u4ee3\u8868\u662f\u9ede\u5c0d\u9ede\u7db2\u8def<\/p>\n\n\n\n
\u7db2\u8def\u7684\u6574\u9ad4\u67b6\u69cb:
network edge(\u7db2\u8def\u908a\u7de3)
end systems(hosts) : \u61c9\u7528\u7a0b\u5f0f\u8207\u4e3b\u6a5f,ex:Web,Email
client\/server model : ex:web browser\/server; email client\/server
peer-peer model : ex:Guntella, KaZaA
network core(\u7db2\u8def\u6838\u5fc3)
\u8def\u7531\u5668,\u7db2\u969b\u7db2\u8def\u672c\u8eab
\u50b3\u9001\u65b9\u5f0f:
circuit-switched(\u96fb\u8def\u4ea4\u63db)
Packet Switching(\u5206\u5c01\u4ea4\u63db)
access networks physical media(\u5b58\u53d6\u7db2\u8def\u5be6\u9ad4\u5a92\u754c)
\u5bb6\u7528\u7db2\u8def:point to point access(\u9ede\u5c0d\u9ede\u50b3\u8f38)ex:\u64a5\u63a5\u5f0f\u6578\u64da\u6a5f,ADSL,cable modem
\u6a5f\u69cb\u7528\u7db2\u8def:local area networks(\u5340\u57df\u7db2\u8def)ex:Ethernet
\u884c\u52d5\u7db2\u8def: Wireless access networks(\u7121\u7dda\u7db2\u8def)<\/p>\n\n\n\n
………………………<\/p>\n\n\n\n
wan\u7684\u4ea4\u63db\u6280\u8853\u6709: <\/p>\n\n\n\n ………… <\/p>\n\n\n\n packet switching\u53ef\u5728\u7d30\u5206 SVC(switched vc,\u4ea4\u63db\u5f0f\u865b\u64ec\u96fb\u8def)\uff1a\u96a8\u6a5f\u5f0f,\u6709\u9700\u8981\u624d\u5b58\u5728,\u6c92\u9700\u8981\u5247\u91cb\u653e\u7dda\u8def,\u8def\u7531\u4e0d\u56fa\u5b9a,\u6280\u8853\u8f03\u8907\u96dc <\/p>\n","protected":false},"excerpt":{"rendered":" WAN(wide area network,\u5ee3\u57df\u7db2\u8def)\u8de8\u8d8a\u5ee3 …<\/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-827","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\/827","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=827"}],"version-history":[{"count":0,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/827\/revisions"}],"wp:attachment":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/media?parent=827"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/categories?post=827"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/tags?post=827"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
circuit switching(\u96fb\u8def\u4ea4\u63db)
<\/strong>ex:\u76ee\u524d\u7684\u96fb\u8a71\u8207\u96fb\u5831\u4ea4\u63db\u7cfb\u7d71
Packet Switching(\u5206\u5c01\u4ea4\u63db) <\/strong>
ps:arpanet(1967)\u662f\u9996\u5148\u4f7f\u7528\u5206\u5c01\u4ea4\u63db\u6280\u8853\u7684wan\u4e4b\u4e00
ps:circuit switching\/packet switching\u627f\u53d7\u591a\u4eba\u4f7f\u7528\u7db2\u8def\u5927\u7d04\u662f35\/10
cell switching(\u7d30\u80de\u4ea4\u63db)<\/strong>,\u8207\u5206\u5c01\u4ea4\u63db\u985e\u4f3c
\u3000\u63d0\u4f9b\u5c08\u7528\u9023\u7dda\u7684\u4ea4\u63db\u6280\u8853,\u5c07\u6578\u4f4d\u8cc7\u6599\u5b89\u6392\u81f3\u7d30\u80de\u55ae\u4f4d\u4e2d,\u4e26\u5229\u4f4d\u8a0a\u6280\u8853\u4ee5\u5be6\u969b\u5a92\u9ad4\u4f86\u4ff4\u9001\u9019\u4e9b\u7d30\u80de
message switching(\u8a0a\u606f\u4ea4\u63db)<\/strong>,\u8207\u5206\u5c01\u4ea4\u63db\u985e\u4f3c
\u6bcf\u6bb5\u8cc7\u6599(\u9577\u77ed\u7121\u9650\u5236)\u662f\u6574\u500b\u6536\u5230,\u6aa2\u67e5\u7121\u8aa4\u5f8c\u5728\u5f80\u524d\u50b3\u9001
ex:\u96fb\u5831\u3001E-mail
<\/p>\n\n\n\nPacket Switching<\/td> circuit switching<\/td><\/tr> \u9023\u7dda\u6642Shared(\u8cc7\u6e90\u5171\u4eab),\u4e0d\u4fdd\u8b49\u670d\u52d9\u4e0d\u6d6a\u8cbb\u8cc7\u6e90<\/td> \u9023\u7dda\u6642dedicated(\u8cc7\u6e90\u5c08\u5c6c),\u4fdd\u8b49\u670d\u52d9\u6d6a\u8cbb\u8cc7\u6e90
\u7cfb\u7d71\u4fdd\u7559\u4e00\u689d\u9ede\u5c0d\u9ede\u5168\u96d9\u5de5\u50b3\u8f38\u7684\u5b8c\u5168\u4f54\u7dda\u983b\u5bec
\u9023\u7d50\u7d50\u675f\u5f8c\u8a72\u7dda\u8def\u624d\u91cb\u653e\u4ee5\u4f9b\u4ed6\u4eba\u4f7f\u7528<\/td><\/tr>\u7121\u9808\u505a\u9023\u7dda\u524d\u5efa\u7acb\u7684\u52d5\u4f5c <\/td> \u6bcf\u6b21\u901a\u8a0a\u4ea4\u8ac7\u6642\u5efa\u7acb\u7dad\u8b77\u4e26\u7d42\u6b62\u9023\u7dda<\/td><\/tr> \u627a\u9054\u9806\u5e8f\u4e0d\u4e00\u5b9a,\u5c6c\u975e\u540c\u6b65\u50b3\u8f38
\u8cc7\u6599\u50b3\u9001\u524d\u5148\u5207\u5272\u70ba\u5340\u584a\u4e26\u52a0\u6a94\u982d\u8cc7\u8a0a\u5f8c,\u5728\u9078\u64c7\u6b63\u5e38\u7684\u8def\u5f91\u50b3\u9001 <\/td>\u627a\u9054\u9806\u5e8f\u4e00\u5b9a,\u5c6c\u540c\u6b65\u50b3\u8f38
\u5728\u7db2\u8def\u4e2d\u5177\u6709\u5be6\u9ad4\u7684\u96fb\u8def,\u8cc7\u6599\u662f\u9023\u7e8c\u5730\u6d41\u7d93\u7dda\u8def<\/td><\/tr>\u5bb9\u932f\u9ad8<\/td> \u5bb9\u932f\u4f4e,\u6240\u7d93\u96fb\u8def\u67d0\u9ede\u51fa\u932f\u5247\u4e2d\u65b7 <\/td><\/tr> \u4f7f\u7528STDM(Statistical TDM,\u7d71\u8a08\u5f0f\u5206\u6642\u591a\u5de5)<\/td> \u9023\u7d50\u983b\u5bec\u5206\u914d\u5206\u5f0f\u4f7f\u7528FDM,TDM <\/td><\/tr> \u5728\u7db2\u8def\u64c1\u64e0\u6642\u6703\u9020\u6210\u5c01\u5305\u907a\u5931
\u6545\u5728\u901a\u8a0a\u5354\u5b9a\u4e0a\u9700\u8981\u53ef\u4fe1\u8cf4\u7684\u8cc7\u6599\u50b3\u8f38\u8207\u6d41\u91cf\u58c5\u585e\u63a7\u5236\u7684\u6a5f\u5236<\/td>\u7121\u6b64\u554f\u984c<\/td><\/tr> ex:atm,smds,…<\/td> ex:pstn,isdn,pots,…<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Virtual Circuit(\u865b\u64ec\u7dda\u8def)<\/strong>
ex:X.25\u3001Frame Relay\u3001ATM
\u5c6c\u9023\u7dda\u5c0e\u5411,\u5728\u5c01\u5305\u50b3\u9001\u524d\u4e26\u6703\u8207\u76ee\u7684\u5730\u806f\u7e6b
\u50b3\u8f38\u8cc7\u6599\u4e4b\u524d\u5fc5\u9808\u5728\u4f86\u6e90\u7aef\u8207\u63a5\u6536\u7aef\u4e4b\u9593\u5c07\u9023\u7dda\u5efa\u7acb\u8d77\u4f86,\u5c01\u5305\u6703\u4f9d\u5e8f\u627a\u9054
\u53ef\u5206\u70baSVC,PVC,SPVC
Datagram(\u8cc7\u6599\u5831)\u6216\u8cc7\u6599\u5143\u8da8\u8fd1\u65b9\u5f0f
<\/strong>\u5c6c\u975e\u9023\u7d50\u5c0e\u5411,\u5728\u5c01\u5305\u50b3\u9001\u524d\u4e26\u4e0d\u6703\u8207\u76ee\u7684\u5730\u806f\u7e6b
\u8cc7\u6599\u50b3\u8f38\u4e0d\u9700\u9023\u7dda,\u7db2\u8def\u7bc0\u9ede\u63a5\u6536\u5230\u8cc7\u6599\u7528routing protocol\u5c07\u8cc7\u6599\u50b3\u9001\u5230\u4e0b\u4e00\u500b\u7db2\u8def\u7bc0\u9ede\uff0c\u6700\u5f8c\u9001\u5230\u63a5\u6536\u7aef<\/p>\n\n\n\n
\u96fb\u8166\u9700\u5148\u9001\u51fa\u9023\u7dda\u8981\u6c42,\u63a5\u8457\u7cfb\u7d71\u6703\u81ea\u52d5\u627e\u4e00\u689d\u8def\u5f91\u9023\u7dda
PVC(permanent VC,\u56fa\u63a5\u5f0f\u865b\u64ec\u96fb\u8def)\uff1a\u9060\u8ddd\u4e3b\u6a5f\u6c38\u4e45\u9023\u7d50,\u96fb\u8def\u662f\u5c08\u5c6c\u67d0\u7279\u5b9a\u7528\u6236\u5176\u4ed6\u4eba\u4e0d\u80fd\u4f7f\u7528
\u8def\u7531\u56fa\u5b9a,\u8f49\u63db\u8868\u9700\u4eba\u5de5\u8a2d\u5b9a,\u8a2d\u5b9a\u4e2d\u53ebprovisioning,\u8a2d\u5b9a\u5b8c\u53ebprovisioned
SPVC(soft PVC,\u8edf\u6027\u56fa\u63a5\u5f0f):\u8def\u7531\u4e0d\u56fa\u5b9a\u8def\u5f91\u53ef\u8b8a,\u96fb\u8def\u4ecd\u70ba\u5c08\u5c6c<\/p>\n\n\n\n