?????????????

paper.Gzu521.com

???߾?????????????(1)

??Ϣ??????????   ???????   ????ʱ?䣺2006-7-28   ?????壺?? ?? С??   ??Դ??Gzu521.com
?? ?? ѧ ϰ ??
ժҪ???????????˽???????չѸ?ٵ???????????????????ͨ??ʵ?ʹ??̰?????????????ص?֪ʶ??

????ǰ ??  I-{c6T 1t=?T?L [ ?? ?? ?? ?? Դ ?? ?? ?? ѧ ϰ ?? ??ѧ??Ϣ?????? http://Www.gzU521.com ] I-{c6T 1t=?T?L

?????????????????Ǽ????????ʱ??????????????????Ĺ㷺Ӧ?ã??Կ?ݸ?Ч?????????Ϊ???Ƶ????????缼??Ҳ?ڷ??ٷ?չ?????߾??????Ǽ??????????????ͨ?ż??????ϵIJ????רҵ?ǶȽ??????߾??????????????߶?ַ?ŵ???һ????Ч??????֧?ּ????֮???ͨ?ţ???Ϊͨ?ŵ??ƶ????????Ի??Ͷ?ý??Ӧ???ṩ?˿??ܡ?ͨ?׵?˵?????߾???????wireless local-area network??wlan???????ڲ????ô?ͳ???ߵ?ͬʱ???ṩ??̫??????????????Ĺ??ܡ? ͨ????????????Ĵ???ý????Ҫ????ͭ?»???£????????߾???????????????????ijЩ????Ҫ?ܵ????ߵ????ƣ????ߡ????߹?????????·?????𻵣????еĸ??ڵ㲻???ƶ????ر??ǵ?Ҫ???????Զ?Ľڵ?????????ʱ??????ר??ͨ????·?IJ???ʩ???Ѷȴ󡢷??øߡ???ʱ??,??????Ѹ????????????????γ??????ص?ƿ???????????߾????????ǽ??????????????????????ֵġ? 

???????߾?????????ʷ

????˵?????????????ʷ??Դ?????ܱȸ?λ????Ļ?Ҫ?硣????????ij???Ӧ?ã?????׷?ݵ???ʮ??ǰ?ĵڶ????????ս?ڼ䣬??ʱ????½?????????ߵ??ź??????ϵĴ??䡣?????з?????һ?????ߵ紫??Ƽ??????Ҳ????൱??ǿ?ȵļ??ܼ????????????????˾????㷺ʹ????????????????????ѧ?ߵõ?????У???1971??ʱ???????Ĵ?ѧ??university of hawaii?????о?Ա?????˵?һ?????ڷ??ʽ?????????ߵ?ͨѶ???磬?ⱻ????alohnet?????磬?????????൱???ڵ????߾??????磨wlan???????????wlan??????7̨??????????Dz???˫?????????ˣ?bi-directional star topology??,????????????ĵĵ??죬???ļ???????????ߺ?????oahu island???ϡ?????ʱ??ʼ???????????˵????ʽ?????ˡ? ??ȻĿǰ???????еľ??????磨lan?????Ծ??????ߵļܹ??????????????????????Ӧ??ȴ?ս????ӣ???ҪӦ????ѧ???磨???Ǵ?ѧУ԰????ҽ?ƽ硢????ҵ?Ͳִ?ҵ?ȣ???????صļ???Ҳһֱ?ڽ?????????ҵ????Ҫת????????????Ҳ???????ס????ӱ????ˡ? 

???????߾??????ļ????ص? 

???????߾????????õ?Ų??ڿ????з??ͺͽ??????ݣ??????????½??ʡ????߾??????????ݴ????????????Ѿ??ܹ??ﵽ11mbps??????????Զ??20km???ϡ????Ƕ???????????ʽ??һ?ֲ??????չ??ʹ???ϵļ???????п??ƶ??ԣ??ܿ??ٷ???ؽ??ʹ?????߷?ʽ????ʵ?ֵ???????ͨ???⡣ 

????1.???߾????????ŵ?

????????????????ȣ????߾??????????????ŵ㣺 

??????װ???

????һ???????罨???У?ʩ????????????ܱ߻???Ӱ?????ģ????????粼??ʩ?????̡???ʩ???????У???????Ҫ??ǽ??ء????߼ܹܡ??????߾????????????ƾ?????ȥ??????????粼?ߵĹ???????һ??ֻҪ??װһ???????????ap(access point)?豸???Ϳɽ?????????????????????ľ??????硣 

????ʹ????? 

???????????????У??????豸?İ???λ??????????Ϣ??λ?õ????ơ???һ?????߾????????ɺ????????????źŸ??????????κ?һ??λ?ö????Խ??????硣 

???????ý?Լ 

????????????????ȱ??????ԣ????Ҫ??????滮?߾????ܵؿ???δ????չ????Ҫ?????????????Ԥ??????????ʽϵ͵???Ϣ?㡣??һ??????ķ?չ????????ƹ滮????Ҫ???ѽ϶???ý??????????,?????߾????????Ա???????????????ķ?????

??????????չ 

???????߾??????ж??????÷?ʽ???ܹ???????Ҫ???ѡ???????????߾?????????ʤ?δ?ֻ?м????û???С?;?????????ǧ?û??Ĵ??????磬?????ܹ??ṩ??????(roaming)?????????????޷??ṩ?????ԡ????????߾????????ж෽????ŵ㣬???Է?չʮ??Ѹ?١??????????????߾??????Ѿ???ҽԺ???̵ꡢ??????ѧУ?Ȳ??ʺ????粼?ߵij??ϵõ??˹㷺Ӧ?á? 

????2?????߾?????????ؼ??? 

????1). ieee 802.11??׼

????ieee 802.11????1997???ɴ????ľ??????Լ??????ר????ͨ???ı?׼??ieee 802.11?涨?????߾???????2.4ghz???ν??в???????һ???α?ȫ?????ߵ編??ʵ?嶨??Ϊ??Ƶʹ?ò??Ρ? 

????1999??8?£?802.11??׼?õ??˽?һ???????ƺ??޶?????????һ??????snmp??mib??ȡ??ԭ??????osiЭ???mib?????⻹?????????????ݣ?һ??802.11a?????????˱?׼???????㣬Ƶ??Ϊ5ghz??????qfsk???Ʒ?ʽ??????????Ϊ6mb/s??54mb/s????????????Ƶ?ָ??ã?ofdm???Ķ?????Ƶ?????????ṩ25mbps??????atm?ӿں?10mbps????̫??????֡?ṹ?ӿڣ???֧???????????ݡ?ͼ??ҵ??????????????ȫ?????????ڡ?????ĸ???Ӧ?ó??ϡ????ǣ????øñ?׼?IJ?ƷĿǰ??û?н????г?????һ????802.11b??׼????2.4ghzƵ????????ֱ????????Ƶ??dsss???????Ͳ??????????(cck)???Ʒ?ʽ???ñ?׼???ṩ11mb/s?????????ʣ????ܹ?????????ı仯????11 mbps??5.5 mbps??2 mbps??1 mbps?IJ?ͬ????֮???Զ??л??????Ӹ????ϸı????߾???????ƺ?Ӧ????״???????????߾???????Ӧ?????????ڣ???????????????????߾???????Ʒ??????802.11b??׼?? &"JY^Y: C.`GB-m[ ????ת?????ҵ?ѧϰ????ѧ??Ϣ?????? http://www.Gzu521.com]&"JY^Y: C.`GB-m

????2). ???߾?????????ظ??? 

??????һ?????͵????߾??????????У???һЩ???????ݷ??ͺͽ??յ??豸????Ϊ?????(ap)??ͨ????һ??ap?ܹ??ڼ?ʮ???ϰ??׵ķ?Χ?????Ӷ???????û?????ͬʱ???????ߺ??????????????£?ap????ͨ????׼??ethernet?????봫ͳ??????????????????Ϊ?????????????????????ӵ㡣???߾????????ն??û???ͨ???????????ȷ??????硣 

???????߾?????????????Ҫ?????¼??ֽṹ????Ե??͡???Զ???͡????Ե??ͺͻ???͡? 

?????? ??Ե???

?????????ͳ????ڹ̶???Ҫ??????????λ??֮?䣬???????????ij??÷?ʽ??ʹ????????????ʽ???ɵ????磬?ŵ??Ǵ??????Զ?????????ʸߣ?????绷??Ӱ???С?? 

?????? ??Զ???? 

?????????ͳ???????һ?????ĵ㣬???Զ?˵??????¡???????ŵ????齨????ɱ??͡?ά???򵥣???Σ?????????ʹ????ȫ?????ߣ??豸??????????ס??????????ȱ??Ҳ????Ϊʹ????ȫ?????ߣ???????ȫ????ɢʹ?ù??ʴ??˥???????紫?????ʵͣ????ڽ?Զ?????Զ?˵㣬????Ŀɿ??Բ??ܵõ???֤?? 

?????? ????? 

?????????? ????????????????????Զ????ĵ㡢??????ĵ㣬???н??????ɽ???赲?ĵ㡣???齨????????ʱ???ۺ?ʹ?????????????͵????緽ʽ??????Զ????ĵ?ʹ?õ?Ե㷽ʽ????????Ķ??????õ?Զ?㷽ʽ?????赲?ĵ?????м̷?ʽ?? 

???????߾???????????Ӧ????????????????? 

?????? ?????????߾????? 

????????ָ???????綼ʹ??????ͨ?ŵ????Ρ??????ַ?ʽ?¿???ʹ??ap??Ҳ???Բ?ʹ??ap???ڲ?ʹ??apʱ???????û?֮??ͨ??????ֱ?ӻ???????ȱ???Ǹ??û?֮???ͨ?ž???Ͻ????ҵ??û??????϶?ʱ?????ܽϲ 

?????? ?Ƕ????????߾?????

?????ڴ????????£?????ͨ??????Ϊ????ͨ?ŵ?һ?ֲ??????չ?????ǰ??????????Ϊ?Ƕ????????߾??????????????????£????apͨ?????????????????????ϣ???ʹ?????û????ܹ?????????ĸ??????֡? 

??????????ظ??? 

?????? ΢??Ԫ??????????

???????ߵ粨?ڴ????????л᲻??˥????????ap??ͨѶ??Χ???޶???һ???ķ?Χ֮?ڣ??????Χ????Ϊ΢??Ԫ???????绷?????ڶ?tap???????ǵ?΢??Ԫ??????һ????Χ???غ?ʱ???????û??????????????߾??????????????ƶ????????????ܹ??Զ????ָ????ź?ǿ??????ap????ͨ?????ap?շ????ݣ????ֲ???ϵ????????ӣ???ͳ?Ϊ???????Ρ? 

?????? ??Ƶ 

??????????????߾???????Ʒ??ʹ??????Ƶ????????Ƶ????ԭ???Ǿ???ͨѶ??????ʹ?õ?????????ͨ?ż?????ʹ????Ƶ???????ܹ?ʹ?????????ߴ??????????ɿ???????ȷ??ͬʱ?ڲ?ͬƵ?δ???????ݲ??ụ????š? 

?????? ֱ????Ƶ

??????νֱ????????Ƶ??????ʹ?þ??и????ʵ???Ƶ???У??ڷ??????չ?źŵ?Ƶ?ף????ڽ??ն?????ͬ????Ƶ?????н??н???????չ??????Ƶ?źŻ?ԭ??ԭ?????źš? 

?????? ??Ƶ??Ƶ

??????Ƶ??????ֱ????Ƶ??????ȫ??ͬ????????һ????Ƶ????????Ƶ????Ƶ??һ??α?????Ŀ??ƣ????乤????????Χ?ڣ???Ƶ?ʰ???????ɲ??ϸı?Ƶ?ʡ????ն˵?Ƶ??Ҳ????????ɱ仯?????????뷢??˵ı仯????һ?¡?

??????Ƶ?ĸߵ?ֱ?ӷ?ӳ??Ƶϵͳ?????ܣ???ƵԽ?ߣ??????ŵ?????Խ?ã????õ???Ƶϵͳ???Դﵽÿ??????????ʵ?????ƶ?ͨ??gsmϵͳҲ????Ƶϵͳ?????ڳɱ??Ŀ??ǣ???????Ƶϵͳ???ٶ???????һ????50??/?????¡???????????Ƶϵͳʵ?ּ򵥣???˵??????߾????????????????ּ?????

???????߾???????Ӧ??

???????????߾????????е?????ŵ㣬???ɹ㷺Ӧ????????????

????1.??????????Ϣϵͳ???????ʼ????ļ???????ն˷??档

????2.???Բ??ߵĻ??????Ͻ????????????ѻ򰺹??¶?????򡢳??н???Ⱥ??У԰?͹????? 

????3.Ƶ???仯?Ļ?????Ƶ???????????ص?͸ı?λ?õ??????̡??????̣??Լ?Ұ?⿱?⡢???顢???¡??????????еȡ? 

????4.ʹ?ñ?Яʽ??????ȿ??ƶ??豸???п??????????ӡ? ":.~`|:[email protected];}GEqR[??_??_??_Դ_??_??_??_ѧ_ϰ_????ѧ??Ϣ?????? http://Www.GZU521.Com ]":.~`|:[email protected];}GEqR

????5.????Զ??????Ϣ?Ĵ??䣺???????????л??֡????溦????Ϣ?Ĵ??䣻??????ͨ???????Ž??н?ͨ?????ȡ?

????6.ר?Ź??̻?߷?ʱ?????????ʱ????????ѧУ????ҵչ????????ص????Ա??????ǿ?ĵط??????????߾???????????Ϣ?Ľ??????????̡????˺ͺ??˹?˾?߷?ʱ??????Ķ??⹤??վ?ȡ? 

????7.?????????߿ɵõ???Ϣ????????Ҫ??ҽԺ???????̵??칫??????????ʱ?õ???Ϣ??ҽ??????ʿ???????̡????칤???ߡ? 

????8.?칫?Һͼ?ͥ?칫?ң?soho???û????Լ???Ҫ?????ݵذ?װС????????û??? 

???????߾??????Ľṹ

???????ݲ?ͬ????????Ӧ?û?????????IJ?ͬ?????߾??????ɲ?ȡ??ͬ??????ṹ??ʵ?ֻ????????õľ????????¼??֣? 

????1???????????ͣ???ͬ?ľ?????֮?以??ʱ???????????ϵ?ԭ??????ȡ???߷?ʽ?????㣬??????????????ŵķ?ʽʵ?ֶ??ߵĵ?Ե????ӣ????????Ų????ṩ????֮???????????????·??????ӣ???Ϊ?????????û??ṩ?ϸ߲??·????Э??ת???? 

????2????վ?????ͣ????????ƶ?????ͨ???????뷽ʽ?齨???߾?????ʱ????վ??֮???ͨ????ͨ????վ???롢??????????ʽ??ʵ?ֻ????ġ????ƶ?վ????????ͨ??????????????????????????ͨ??????????Զ??վ???齨?Լ??Ĺ??????硣 

????3??hub?????ͣ?????????hub?????齨???ͽṹ?????߾?????????????????hub??????ʽ?????Ƶ??ŵ㡣?ڸýṹ?????ϵ?wlan???ɲ????????ڽ???????̫???Ĺ?????ʽ??Ҫ??hub???м򵥵????ڽ??????ܡ? 

????4???????Ľṹ??Ҫ??????????????վ?????ֱ??ͨ?š??˽ṹ?????߾?????һ??ʹ?ù??ù㲥?ŵ???mac?????csma???͵Ķ?ַ????Э?顣 

???????߾?????????????ͨ????????????ͨ??????hub?????߽???վ??ap???????????š?????modem??????????????ʵ?֣?????????????????Ϊ?ձ飬ʹ????ࡣ???߾??????Ĺؼ??????????˺??⴫?似??????Ƶ????????ͬ???????⻹??һЩ???????????磺???Ƽ??????ӽ??ż????????߷ּ????ռ????????ʿ??Ƽ????ͽ??ܼ????? 

???????߾??????ľ???ʵ??

????????ͨ????ʵ?ʹ????ж????߾??????豸?ͼ???ʵ???й???Ϊ??̵ĽӴ????????Թ??ݿ?????˾??enterasys networks????roamabout 802.11ϵ?????߾??????豸?????߾??????ľ???ʵ?ּ??Լ򵥽??ܣ? 

????1?? roamabout802.11?豸??飺

????enterasys?Ƴ???roamabout????????????????????Ѹ?١????ɺ;??õؽ???????lan????????Ϊ?û??ṩ??????̫???Ŀɿ????ܡ?roamabout 802.11ϵ?в?Ʒ??????????ɣ?ȫ???ܽ?????????2.4ghzֱ????????Ƶ??????̫??pc????ǰ?߿???ͨ????????˫???߶ԣ?Ѹ?ٶ????ɵ?????????lan?????ߵĹ????????????б?׼????????̫??????????ʹ????Ƶ?????ǵ?????????lan???ӡ????û?????????????????ʱ??roamabout pc???????޷???л?????ͬ??????ϣ??Ӷ?ʼ?ձ?????????????ӡ? 

????2?? ???̾???ʵ??ʵ???? 

??????1??ij˰??־ִ?¥???ѽ???һ?????߾????????ڷ־ִ?¥?????߸?????Ҫͨ?????߾????????¥?ڵ????????????ӡ??־ִ?¥????߸????????־???Զ????15km?????3km????????????????һ???????????ѽ???һ??С???߾???????????һ??ӵ??2??4̨????վ?????Dz??õ????߾???????Ʒ??????2.4ghz??2.4835ghzƵ?ʷ?Χ?ڣ???Ҫ??????ͨ?ŵ??????֮?????û???????ڵ????????ڴ?¥???ڷ????ش??????ѡ??һ??¥??ϸߵ?????Ϊ???߾???????????վ?㡣??????վ???Ͻ???һ?????߽????ap-10d??????????ͨ??????һ??վ??????sa-40d??????վ???ap-10d????ͨ?ţ??־ִ?¥?ڵ????߾???????ͨ??????һ??????????wb-10d??????վ??ap-10d????ͨ?š???????????־?????վ??????߾??????ķ??ʾ?ͨ??????վ??Ŀ?????ʵ?֣????ǹ???????վ??ap-10d??3m??????

??????2??ij???Ź?˾????ҵ?ֲ??ڲ?ͬ?Ľ??????ڰ칫??????????Ʊ???ר?????ӣ?ÿ??֧???????????Ѻ?ά?????ã??????޷?????ƶ?վ????ʺʹ?ȡ??˾??????Ϣ??????2.4ghzƵ?????߾???????Ʒ?????ԱȽ????????һ?廯??ҵ???磬?ﵽ??ר????ͬ?????ܣ???????ƶ?վ?????⣬?Ұ?װά?????㣬???轻Ƶ??ʹ?÷ѡ????巽????ʹ?????߽???㣨ap?????Žӹ??ܣ?һ???뽨???????????????һ????????????hub??????????????????¥???????????????ר?߹??ܡ???Χ?ƶ?վ??ͨ?????߽?????빫˾???????绥???????ʺʹ?ȡ??˾??Ϣ?? 

?????????? 

????????????ij??־???Ϊ?˽???????????޷??˷??????ѡ???Ȼ????????????????ƣ???????????????ȣ????߾?????Ҳ?кܶ಻?㡣???????????ʽ??????۸?ϸߣ????????Ҫ???????ض???????û???Ŀǰ???߾?????????????ȫ???????????磬???????????????????ǻ????Ĺ?ϵ???????Ǿ?????Ŀǰ??ֻ??????????IJ??䣬???????滻????ҲӦ?ÿ??????????????????????????߾???????Ʒ?ļ۸??????½?????Ӧ????Ҳ?𽥳??졣???⣬???߾????????ܹ?ͨ????????????ϵ???ʽ?ṩ?ƶ????????Ķ?ý??ҵ????????δ???????߾????????????ĸ??ٴ?????????????Է??Ӹ?????Ҫ?????ã?

??һҳ
???Ĺ?3ҳ: ?? 1 [2] [3] ҳ

???α༭??gzu521

??ѧ???ķ???
????????????
????...
????????????
????...