通信运营与管理专业英语教程 教学课件 作者 李学军 unit 6.ppt

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1、Unit6BroadbandInternetAccessImportantVocabularydial-upaccess拨号上网bitrate速率disrupt扰乱asymmetric不对称的penetration接入率覆盖率backbone脊椎，主干网filesharingsystem文件分享系统reconfigure重新设置telco电信公司videodemandservice视频点播系统videoconferencing视频会议highend高端的newsgroup新闻组gigabyte十亿字节terabyte1000千兆faci

2、lity设备staticIP静态IPrandomIP随机IPhacker黑客decentanti-virussoftware正版杀毒软件leveloftraffic流量BroadbandInternetAccessBroadbandInternetAccess,shortentojust“broadband”,ishighspeedInternetaccess—typicallycontrastedwithdial-upaccessovermodem.Readandanswer:Whatisthedifferencebetweenbro

3、adbandanddial-upmodem?1.Speeddial-upmodem:amaximumbitrateof56K/Sbroadband:atleastdoublethespeed2.Impactontelephoneusedial-upmodem:requirethefulluseofatelephonelinebroadband:withoutdisruptingtelephoneuse.Minimumspeedsofbroadband:rangingupfrom64kbit/supto1.0Mbit/s,Definiti

4、onsofbroadbandinspeedtheOECD:equaltoorfasterthan256kbit/stheUSFCC:200kbit/s.Whatcanwedowithbroadbandinternet?What’stheimpactofincreasedbandwidth?1.Impactonendusers.ExpectvideoondemandserviceBroadbandprovideswithanalwaysonserviceOpenupmanypossibilitiesintermsofhowtouseser

5、vicesontheInternetOnlinedictionaryandlanguagetranslatorsUsewebspacejustlikeanotherstorageareaandhaveareasonablyhighspeedremotebackupfacility.2.ImpactonnewsgroupsReadananswerHowtopreventhackersenteringyourcomputer?Patchup“holes”inthesecurityUsesoftwaretocontrolaccesstothe

6、“outsideworld”.Toinvestinsomedecentanti-virussoftwareandtokeepthisuptodate.