This question was discussed for many times at asl forum. I think the only way to connect with two internet connections was a router with two interfaces to dsl.
Your question was so because you want to connect with two providers?
Here is the entry from forum
Its the same provider for the 2 connections. Tha bigger adsl connection they provide is 512kb and I want to lease a second one in order to upgrade the bandwidth to 1024 kb
