i have two hr-22's. both are hooked through a switch to the internet but i am only getting the on demand service to the one i have a pi-21 inserter on. do i need to add another pi-21?? if not what do i need to do other than putting it on to a different port of my router. the switch has one pc, two hr-22, and one hd box hooked to it. please let me know. thanks