ADSL课程目录一、ADSL的起源与历史...................................................................................5二、ADSL在国外及我国的发展情况...............................................................81、美国.........................................................................................................8--贝尔大西洋公司耗资18亿美元升级通信网.................................8--AOL与电信公司合作提供DSL接入...........................................9--Qwest推出DSL服务.....................................................................9--GTE大幅削减DSL服务的价格..................................................102、英国.......................................................................................................103、新加坡...................................................................................................114、中国.......................................................................................................11三、ADSL厂商简述.........................................................................................11--Micrrsoft投资DSL服务.......................................................................11--朗讯推动DSL普及................................................................................12--阿尔卡特和康柏在欧洲联手开拓ADSL市场.....................................12四、ADSL的主要特点.....................................................................................14ADSL与CableModem的比较：............................................................16ADSL与普通拨号Modem及N-ISDN的比较：................................16五、ADSL系统构成.........................................................................................17六、ADSL技术简介.........................................................................................201.技术性能分析..........................................................................................212.调制技术..................................................................................................222.1QAM调制技术........................................................................222.2CAP调制技术..........................................................................222.3DMT调制技术.........................................................................23七、ADSL技术特点.........................................................................................24八、ADSL调制方式.........................................................................................25（1）正交调幅（QAM）..........................................................................25（2）无载波调幅／调相（CAP）...........................................................25（3）离散多音频调（DMT）..................................................................26九、ADSLModem技术....................................................................................27ADSL技术揭密.........................................................................................27ADSL的诱人之处.....................................................................................29十、ADSL应用纵横.........................................................................................311.端到端的ATM........................................................................................312.PPPoverATM.........
