ADSL is a high speed internet connection. A broadband connection is also a high speed internet connection. There are different speeds for both types of connections. There are many ways to gain a high speed connection.
ADSL.
3g is mobile internet and adsl is a type of home internet so adsl is better
Dialup is slow, ADSL is fast
Asymmetric Digital Subscriber Line(ADSL)
Splitter
A scaling tower and scaling ladder are both used to scale walls. A scaling tower is better though
ADSL and VDSL
For troubleshooting tips for your adsl modem you can read about go to support.hubris.net/dsl/troubleshooting.html. For more help you can go to www.eternalmart.com/tag/adsl-troubleshooting-speed/.
Speed is the difference between HDSL and ADSL. HDSL has high upload and download speeds whereas ADSL has a slow upload speed coupled with a high download speed.
ADSL is simply a version or 'flavour' of DSL. The 'a' refers to asymmetric, meaning 'not the same'. Hence, ADSL usually has different downstream and upstream rates (e.g. 1536/256 is a common speed of ADSL available in Australia, where downstream the link speed is 1536kbps and upstream is 256kbps).
I believe your Internet Service Provider must sell you this option. Once you pay for it your router should be working at the speed of ADSL. I am currently using ADSL, but will be going to a faster speed.