I actually dont know much about it. But my Dad works in SBI and is currently posted somewher remote in Uttrakhand state. They have CBS branch and since there is not even a landlinein that village so getting DSL is difficult there. So SBI got themselves a V-Sat connection which is a sattelite based conection. You must have seen a lot of dish antennae on top of ATM booths. they are all Sat antennae.