To tell you the truth I have VDSL so my Television also comes threw my phone line but... since the television takes out about 3/4 the bandwith I get about a 800kbps upload. Now think if we did not have the TV hooked up there how fast would it go!!!! Also other reasons I get killer speed is the amount of people on the OC 15 line. Non Hahaha
I used to have a cable and now in my new apartment I have ADSL @ 1.5M because the property management company does not allow the cable provider into the premises. It's like turning the pages of a book.....FANTASTIC.....but no diferent from my cable.