Bharat Sanchar Nigam Limited (BSNL) said that it has become "operationally sustainable organisation" with a market share of 10.25%, and is looking to place an initial order of fourth generation or 4G equipment for 50,000 sites following the successful outcome of proof-of-concept (PoC). "Today, BSNL is an operationally stable organisation, and on the right path. The challenge is only interest outgo on debt which comes to the tune of Rs 200 crore to Rs 1,000 every month," Pravin K Purwar, chairman, BSNL told ETTelecom.