Airtel Broadband DSL modem configuration is similar to BSNL one. If you already have a modem you can configure it with the following the settings. I had a BSNL DSL wireless router/modem, which I was able to configure successfully for Airtel Broadband connection.
1. Login to your modem/DSL router typing 192.168.1.1 on your browser with username : admin (default password would be password)
1. Login to your modem/DSL router typing 192.168.1.1 on your browser with username : admin (default password would be password)
2. Go to WAN(Wide Area Network) Setup and click edit on the first entry in the table with settings Vpi/Vci as 1/32 with protocol PPPoE (If you are using BSNL modem, Vpi/Vci would be 0/35 - change that to 1/32)