
Ǹÿ̨ϼеModemȻѲˡӦûһʽʱˡ 
56Kbps ModemĲƷĵȷ٣ISDNxDSLCable ModemȡôǵӦòʲôʽأΪǸʽ֮һISDNֻйʿԴﵽ128kbpsȴCable ModemxDSLISDNȽϰ󣬲õԽ࣬Խߡڿ128kbpsǽġxDSLADSLRADSLHDSLVDSLȣǿԵõֻADSL
ͨ绰еADSLԴﵽ8MbpsٶȺ1.5Mbpsٶȣû绰˾·Ҫ1-2kmڣ·㣻ʹõ绰˾ָADSL Modemٶֵֻͨû޷ﵽû56KbpsߵV.90 Modemһ
³̨G.Lite׼ſ̵·ҿʹV.90 ModemɵϲADSL ModemһеıٶΪ۵ġG.Lite׼1.5mbpsٶȺ348kbpsٶԤΪٶȡСЩٶȵġٶӦ(Rate Adaptive)ҲǸñ׼һ֡ԣISP޶ûĿôߵCable Modemṩ30MbpsĴ㲻òᣨ50030Mbpsע⣬ҪΪõĴ=ܴ/ûùʽһ֪ûʵʹô>>ܴ/ûΪÿ˶ͬһʱռ磬ҹӦ̿Ը̬Ƶʹݴ䡣һܴͽɱӡңӦ̻Сԭ500С50ٶȡ
ADSLCable ModemҪװķӣһ㶼Ҫ²ߡҪ²ߵйĴط޷ʵ֣ҵĵ绰зֻ˵װADSLͿ鷳һЩûзֻ׼ĵ绰߻Źĵ绰ȻɲѡߵͲϸҪȫװ޷ʱ°װЩ·ʹñ׼75ŷͬ£ΪһϵĲڰװ˷ÿڵеķ̫࣬ܿȥǽ֮֡ߵ̨ǿ²ߣǷҪCable ModemķñضADSLٶȾ
Sprint˾ṩ512KbpsADSLÿ´Լ52.99Ԫ1.5mbpsÿ109.99ԪBell Atlanticļ۸512Kbpsÿ49.95Ԫ1.5mbpÿ99.95Ԫ7mbpsÿ189.95ԪAT&TCable Modemÿ½39.99Ԫ30mbpsݳƽٶ1.5mbpsϡЩطADSL(G.lite 1.5 mbps)Cable Modemٶ˱ȽϣADSLڰCable ModemϱȰۺʱ֮Ĳ಻100kbpsɼߵٶȿνƾСɼCable Modemļ۸ȻADSLϼ۸Ϊ¼۸ڵأ۸һΪ2-4Ԫ/Сʱ20Ԫ£ҹADSLļ۸ֱۣ50Ԫ/+N*(20Ԫ/Сʱּʱķʽ޷õȻΪ䰺ISPʧȥûշѷʽ޷õԸߴҵǣCable Modemûа취ʱշѵġΪCable Modem򿪼ʱѾǼʱշѣôʹ÷Ѿͱɼʹ÷ˡҪÿûһ̶IPַڹ˾ѧУкʵ֣˼أûܵԼȫIPַʹԼķüǵ˼ҵͷϣͻ̱
IPַ⣬˵ģIPַҪˣʵȫIPַķΪһINTERNETϲڵIPַ(10.x.x.x172.16.x.x-172.31.x.x192.168.x.x)ЩַINTERNETԤģԶINTERNETϷ䡣ISPΪһĵַINTERNETʱרŵ·䷭һϷĵַõĽǸ·ת㣬ͨProxyINTERNETISPֻΪ·ṩ1IPַͿˡˣ͸طINTERNETINTERNETϵ޷ط㣬Hakerǣ޷ˣԼҡʵڵõ61.x.x.xĵַ֮ǰѾʹø÷ʱˣ๫˾ѧУܻʹõҲַIP⣬оһ㡣ΪڶԼ۸ߵļͥû˵ͼ۸ٵCable Modemѡ񣻶8mbpsADSLһЩҪĹ˾ǲѡ񣬵G.lite˵ûо
һݿԲοCable ModemûĿĿǰ10ADSLûҪҪһ㣬xDSLεͨ绰ϣޣִVDSLҲֻдﵽ30mbpsҡCable Modem··кܴǱ˵ֻҪʹøһһֵƷʽCable ModemͿ64mbps·ʽ5ҾͿʵ֡ʱCable Modemٶȿܻ300bps MODEM56Kbps MODEMߡߵȻCable Modemû 
 