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  • 工作学习 / IT杂谈 / High Speed 到底算什么东西？ ADSL？ ISDN？ -guest:cola; 2001-3-5 {104} (#30505@0)
    盒子上写的DSL
    我记得国内的ADSL不是专用电缆么？ 这里怎么电话线连？
    国内电话线连的不是ISDN么？ confused
    • Bell Sympatico uses ADSL (Asymetric DSL). Rogers@home uses Coxal Cable. -wjiang(wjiang); 2001-3-5 {217} (#30511@0)
      Inidvidual consumer doesn't use ISDN.
      ISDN is digitalized connection.
      Don't confuse standards with physical
      carriers. For example, ISDN is a digital
      standard. Telephone line is the physical
      carrier for ISDN.
    • ADSL or SDSL -guest:; 2001-3-5 (#30512@0)
    • DSL的流行就是因为使用了电话线，是用回波抵消的技术达到高带宽。而且使用的是你的电话线同时跑语音和数据，不需要专用电缆，isdn是一种过时的技术，只有中国电信还拿来骗骗人。 -chrisxu(chris); 2001-3-5 (#30558@0)
      • how about cable modem? -bolomi(bolomi); 2001-3-6 (#30639@0)
        • 取决于你的住址，如果你离局端设备(电信交换机房比较近，旧用adsl否则还是用cable，但别忘了你还要先接cable. -chrisxu(chris); 2001-3-6 (#30641@0)
      • 你知道什么叫ISDN吗？什么叫过时的技术？不懂别瞎说。 -guest:; 2001-3-6 (#30645@0)
        • 懂的多说点 -bloor(bloor); 2001-3-6 (#30674@0)
        • ISDN是过时了的.现在电信局都不愿使这玩意.只是钱抽\投下去,,不得不撑住,不信我? -bolomi(bolomi); 2001-3-6 {75} (#30739@0)
          ???我就在电信局上班!(相关人员都在接受ASDL的培训了.)只可惜俺不是学程控的....
        • 我确实不太懂，呵呵，反正学了也没用。当然你对isdn特别了解的话，转学atm其实挺容易的。两者的机制非常象。另外想一想你说的，也有道理窄带isdn虽过时了，但宽带isdn（atm）还没有呢，呵呵。 -chrisxu(chris); 2001-3-6 (#30835@0)
          • my first job was working for Alcatel / Newbridge for LMDS, is wireless ATM, called LMDS. -juliancanery(julian); 2001-3-6 (#30890@0)
            • must know you instantly. I am doing Alcatel /Newbridge now!!!! e-mail me edwardjiang@hotmail.com -wjiang(wjiang); 2001-3-7 (#30926@0)
            • Does it like Ip over Fiber?Or you can tell me more? -chrisxu(chris); 2001-3-7 (#30939@0)
              • Are you talking about carrier? spectrum 27-28 Ghz, bandwidth 1 Ghz, 10Mbps. -juliancanery(julian); 2001-3-9 {203} (#31617@0)
                Local Multiple Distribution Service-- BWA Broadband Wireless Acess.

                for information please check IEEE802.16, or ITU recommadations on web site.

                Please check Industial Canada web site for spectrum.
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