Even with mpeg2 technology one TP can carry upto 16-18 channels.Say 16.Then also 12*16=192 channels.There is lot of space in other satelites like INSAT 2E which are also 83 degrees to East.Tata Sky can use them.Take example of Dish tv.They are providing 170 channels with 11 TPs.Out of these 35 are from DD.So 170-35=135 plus space used for active services and EPG and audio channels.