Can I use a 28.8/56k modem with my xDSL line?
Theoretically yes. However, most DSL providers have been installing separate DSL circuits to the remote user without using a splitter to separate out the voiceband bandwidth. If a splitter was used, you could use a traditional POTS modem over the the voiceband frequency spectrum of your phone line as you always did. In most cases however, the line is dedicated for DSL.
