What is VDSL? How it is different to BSNLs existing ADSL modems?
VDSL: Very high bit rate DSL ADSL: Asymmetric DSL VDSL has a maximum of 52 Mbps downstream and 16 Mbps upstream data transmission rate. ADSL has a maximum of 8 Mbps downstream and 1 Mbps upstream data transmission rate. If you want to move from an ADSL service to a VDSL you have to change your modem. But you can also buy an ADSL2+ modem. It supports up to 24 Mbps download speed.