Since ADSL2 is an enhanced version of ADSL, or Asymmetrical Digital Subscriber Line, it has faster download rates and greater resistance to line noise. Line noise refers to the variation in a transmitted signal that typically occurs in electric connections.
ADSL2 also has an improved range compared to its ADSL counterpart that uses the same copper wires. An improved range automatically translates to a greater coverage and better transmission rates. In order to save power, ADSL2 incorporates a stand-by-mode that also reduces the amount of time needed for initialization from 10 seconds in the traditional ADSL connection to about 3 seconds. Like other improved technologies, ADSL2 is reverse compatible with ADSL meaning ADLS2 equipment can be used at ADSL specs. This greatly simplifies the process of upgrading from ADSL to ADSL2.
Both ADLS2 and ADSL are broadband connections that are capable of concurrently transporting numerous traffic types and signals. They achieve this by properly managing the available bandwidth from a two-wire pair used by telephone systems. This allows them to receive and transmit data of varying types at faster speeds than a single channel connection. Apart from ADSL2 and ADSL, there is ADSL+, which is also an upgrade to ADSL that provides greater speeds compared to both ADSL2 and ADSL.