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Technology Stocks : ADSL (G-Lite) for dummies - AWRE,PAIR,ORCT,ASND,COMS,NN -- Ignore unavailable to you. Want to Upgrade?

To: John Stichnoth who wrote (135)	3/12/1999 9:51:00 AM
From: JW@KSC	Read Replies (1) \| Respond to of 201

Re:Tom Jones and John Stichnoth Tom, John gave you some good answers. I will make a few changes. Will there be one ADSL chip or box for each telephone line? No it take takes two in a since. There is one chip in your ADSL Modem, then there is one in the DSLAM at the Telco Company Office. Some DSLAMS and many in the future, have one chip that can handle 4 lines possibly more in the future. Is there concern for shared bandwidth there like cable? No! Each copperpair (each Telephone line) is a a separate dedicated line. The only thing shared with "your" DSL Data is "your" Voice line. On a telephone line your voice call uses 4Khz of bandwidth. In reality you line has a total of 1Mhz of Bandwidth. ADSL uses that full 1Mhz, and breaks it up into 256 4Khz signals. One of those 4Khz signals is still used for voice, hence while being online you can still use your Telephone at the same time. Even if your ADSL connection is Lost due to some unforeseen problem, your voice line will still work as your Life Line always has in the past. Recently there has been some news about interoperability of ADSL equipment. Does this mean all the ADSL companies are on the same footing and the telephone companies can choose any ADSL equipment and it will work with the others? There is a Standard for "Full" ADSL Set by the ANSI T1E1.4. "DMT Discrete Multitone (The ADSL Standard Line Code) But because our Phone companies being the cheap bastards they are, did not want to roll a truck to each house to add a Splitter to the Telephone Line outside the home, you will get ADSL Lite 1.5Mb (the splitter splits the Voice Line running though out you house from the dedicated ADSL line running to your PC. The splitter elevates noise/interference that is picked up by your telephone line where it may run next to the Power (AC) lines in your home. Simple things like your Air Conditioner Turning off and On, Hair Dryers, Refrigerator, even turning on a light Switch can cause interference.) So the telco's basically said we want something that the consumer can install in PC and plug in a Modem and have it work, without us Rolling a truck, because we are cheap bastards. Hence you end up with ADSL Lite 1.5Mb instead of 8Mb the speed of Full ADSL. ( This of course depended on how far you lived from the Company Office. Example: if you lived close you'd get 8Mb and the further away you lived the slower it got.) The ADSL Lite Standard will be finalized in June this year. Watch for the Hype Ramp-up this summer, and watch the ADSL Stocks rise with the Hype of a finalized Standard. Here is the link to the T1E1.4 Standard Body for Digital Subscriber Line Transmission. t1.org On the T1E1 home page signup to the mailing list (which I do not suggest) All technical papers can be found on the above page. A better way to keep abreast of ADSL is to goto xdsl.com and register. Hope this helps. I Want My DMT JW@KSC