hi mohit,
o/p power in nolkia bts is 20 watts and 43 db,power in db=10 log(p in watts).now note that for every 3db change power in watts will be twice i.e power in dbm=10 log(1000*p in watts),trx power is always equal to all bts emit power i.e 20 watts in ultra site bts and 40 watts in metro site bts,kindly mail me if any more queries