Unfortu- 1The group "self-dissolved" in the summer of 1999 after completing what they believed their charter to be. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Access Technologies Access Technologies nately, customers still have to be burdened with the installation of micro- filters, and coupled noise on POTS is higher than expected. Many ven- dors argue that these problems largely disappear with full-feature ADSL using splitters; a truck dispatch is still required, but again, it is often required to install the microfilters anyway, so there is no net loss. Fur- thermore, a number of major semiconductor manufacturers support both G.lite and ADSL on the same chipset, SO the decision to migrate from one to the other is a simple one that does not necessarily involve a major replacement of internal electronics. DSL Market Issues DSL technology offers advantages to both the service provider and the customer. The service provider benefits from successful DSL deployment because it serves not only as a cost-effective technique for satisfying the bandwidth demands of customers in a timely fashion, but also because it provides a Trojan horse approach to the delivery of certain preexisting services. As we noted earlier, many providers today implement T1 and E1 services over HDSL because it offers a cost-effective way to do SO. Cus- tomers are blissfully unaware of the fact; in this case, it is the service provider rather than the customer who benefits most from the deploy- ment of the technology. From a customer point-of-view, DSL provides a cost-effective way to buy medium-to-high levels of bandwidth and, in some cases, embedded access to content. Provider Challenges The greatest challenges facing those companies looking to deploy DSL are competition from cable and wireless, pent-up customer demand, installation issues, and plant quality. Competit