Rarely is DSL used in a dedicated point-to-point manner...though it is possible on a large campus between buildings. Most ADSL connections are akin to a T1 line between you and your provider since you have, more or less, a dedicated copper run between your house/business and your service provider's DSLAM. Once it hits the edge of your service provider cloud, the copper goes into the DSLAM and out a high-speed connection (OC3, DS3, etc) to an access concentrator. From the access concentrator, it traverses the service provider's backbone this is why ADSL is more accurately described as a packet-switched connection. Since ATM is at layer 2 think of ATM connections (an example of a packet switched connection) except remember that now the ATM can traverse your copper phone lines. Finally, the traffic will hit other autonomous systems (the Internet) from your provider's backbone.
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