ADSL vs. ISDN Message Board

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Technology Stocks : ADSL vs. ISDN

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To: JakeStraw who wrote ()	10/11/1996 1:01:00 AM
From: Tom Eames	of 25

J You have to understand that ISDN is a network and the Internet is also a distinct Network ( they are very different a serve both overlapping and distinct services)( they grew up apart and are very large and embedded). Both provide services that are succesfull. The ISDN (aka the improved PSTN) provides switched connections including voice anywhere in the world with low delay and 64/128kb/s and a whole standardized worldwide network exists (a big deal) . The local U Interface 2B1Q connection to the home or business is a small fraction of the overall network which includes switches, Interoffice facilities, STPs, Network Management, Billing etc.. The Internet similarly has routers switches and Interoffice like facilities. Both will exist for a long while. ISDN will work on 90+ off all the Telco loops and completely interworks with the massive worldwide PSTN network. ISDN has the ability of consolidating all the Telco services into one fairly uniform network ( a very good thing in its own right) ADSL is another local loop twisted pair transmission technology which will speed up the transmission from 144kb/s to 6Mb/s x 640kb/s second (or a little better) but only a better way to use the Internet or remote access services since it is much faster. Its downside is it will work on a lot less twisted pairs. The good news is there is no reason the huge infrastructure of ISDN can't piggyback on the ADSL ( just use 144kb/s for ISDN) allowing all the ISDN based services while allowing the remaining capacity to be used for the remote access or Internet access to the Internet. The bottom line is, no the ADSL will not displace any of the ISDN network but some of the ISDN 2B1Q lines. These ADSL lines will then allow this new user acccess to both the PSTN and Internet services. Don't expect the PSTN to go away real soon and don't expect the ADSL to wipe out the 2B1Q technology but dent it based on bandwidth demand. There is a very important distinctions between services, local loop access technologies and worldwide huge networks. Each of these is very different and your questions requires all to be blended into the answswer in rather complex ways. Remember the PSTN connections for voice ( over $150 billion) and other services like that are from class five switches and a big network that will change very slowly. The extra bandwidth of ADSL allows the Internet or Remote Accees to be better but is diverted to a completely different TCP/IP network. A final word. The purpose and power of ATM is that it eventually could bring the promise of one consolidated network someday if the PSTN and Internet are converged based on ATM which can deal with voice, video and data all at thee same time and was designed with just that in mind. Someday this will happen but inertia and special interests will not make this happen overnight but it will happen almost as sure as death and taxes. Its not whether it will, but when that is the question. Bet on ATM long term and Frame relay and TCP/IP midterm. The companies are hard to tell as it is a very dynamic world. I hate to promote companies as it is easy to be wrong and easy to leave someone off that deserves mention. A long winded answer too a simple yet complex question. Tom

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