Errr, reliability mostly, but T1's go out all the time if you lease them throught the wrong provider. Same goes for DSL. Bandwidth throughput purely depends on the backbone its hooked into and how ...

I never heard of multiple DSL lines wire to a home. one ADSL line can be trained to be the same as a T1. The max of an ADSL line is about 7 MB/s. If you want that high, you have to pay more, that's ...