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1、五、ISDN1.綜合數(shù)字業(yè)務(wù)網(wǎng)(ISDN)綜合數(shù)字業(yè)務(wù)網(wǎng)(ISDN)由數(shù)字電話和數(shù)據(jù)傳輸服務(wù)兩部分組成,一般由電話局提供這種服務(wù)。TSDN的基本速率接口(BRT)服務(wù)提供2個B信道和1個D信道(2B+D)。BRT的B信道速率為64Kbps,用于傳輸用戶數(shù)據(jù)。D信道的速率為16Kbps,主要傳輸控制信號。在北美和日本,ISDN的主速率接口(PRI)提供23個B信道和1個D信道,總速率可達(dá)1.544Mbps,其中D信道速率為64Kbpso而在歐洲、澳大利亞等國家,ISDN的PRI提供30個B信道和1個64KbpsD信道,總速率可達(dá)2.048Mbpso我國電話局所提供ISDNPRI為3
2、0B+D。2.棊本命令任務(wù)命令設(shè)置ISDN交換類型isdnswitch-typeswitch-typd接口設(shè)置interfacebri0設(shè)置PPP封裝encapsulationppp設(shè)置協(xié)議地址與電話號碼的映射dialermapprotocolnext-hop-address[namehostname][broadcast]ldialstring啟動PPP多連接pppmultilink設(shè)置啟動另一個B通道的閾值dialerload-thresholdload顯不ISDN有關(guān)信息showisdn(active
3、history
4、memoryservices
5、status[dslin
6、terface-typenumber]
7、timers}注:1.交換機(jī)類型如下表,國內(nèi)交換機(jī)一般為basic-net3o按區(qū)域分關(guān)鍵字交換機(jī)類型Australiabasic-ts013AustralianTS013switchesEuropebasic-ltr6German1TR6ISDNswitchesbasic-nwnot3NorwayNET3switches(phase1)basic-nct3NET3ISDNswitches(UK,Denmark,andothernations);coverstheEuro-ISDNE-DSS1signallingsystemprimary-
8、net5NET5switches(UKandEurope)vn2FrenchVN2ISDNswitchesvn3FrenchVN3ISDNswitchesJapannttJapaneseNTTISDNswitchesprimary-nttJapaneseTSDNPRTswitchesNorthAmericabasic-5cssAT&Tbasicrateswitchesbasic-dmslOONTDMS-100basicrateswitchesbasic-ni1NationalISDNTswitchesprimary-4essAT&T4ESSswitchtypefortheU.S.
9、(ISDNPRIonly)primary-5essAT&T5ESSswitchtypefortheU.S.(ISDNPRIonly)primary-dmslOONTDMS-100switchtypefortheU.S.(ISDNPRIonly)NewZealandbasic-nznet3NewZealandNet3switches3.ISDN實現(xiàn)DDR(dial-on-dcmandrouting)實例:BRIO:BRIO:設(shè)置如2Router1:hostnamerouterluserrouter2passwordciscoiisdnswitch-typebasic-net3iin
10、terfacebri0ipaddress192.200.10.1255.255.255.0encapsulationpppdialermapip192.200.10.2namerouter2572dialerload-threshold80pppmultilinkdialer-group1pppauthenticationchapdialer-list1protocolippermit■Router2:hostnamerouter2userrouterlpasswordcisco■isdnswitch-typebasic-net3interfacebri0ipaddress192
11、.200.10.2255.255-255-0encapsulationpppdialermapip192?200.10.1namerouterl571dialerload-threshold80pppmultilinkdialer-group1pppauthenticationchapidialer-list1protocolippermit?Cisco路由器同時支持回?fù)芄δ?,我們將路由器Routerl作為CallbackServer,Router2作為CallbackClien