Speed Differences

• The reason ADSL is asymmetrical is because it allows more bandwidth from the service provider to the customer than the other way around. This leads to enforced limits on download and upload speeds. But while VDSL is still slower uploading than downloading, it is faster than ADSL in both operations and does not have the same bit rate limitations.
  
  

VDSL Advantages

• In addition to much higher speeds of data transmission, VDSL is capable of supporting high-quality video services like HDTV and has multiple available frequency bands that allow users to customize their download rates.
  
  

VDSL Limitations

• VDSL is carried over phone lines and requires close proximity to the service provider. Because of the dedicated infrastructure required, VDSL is not commonly used except in well-connected nations like Japan and South Korea.