To be able to use BSNL WiMax you have three options -
You can opt for this method if your location is nearer to the BSNL WiMax base station.
CPE means Customer premises Equipment. If the WiMax station is within 1 km from your location, you can go for the indoor CPE option.
Outdoor CPE will be useful remote locations upto 15 kms from the nearest base station.
Price of the CPE is Rs.1500 plus taxes for all types. You can also purchase it on rental which varies from Rs.30 to 40 per month (depending on your plan) with a refundable security deposit of Rs. 1000.
It would be better going for rent option because if you go for outright purchase , it would be difficult to get replacement in case of issues.