Yes that is exactly what is meant by - USA won't supply high end electronic items. Does BEL have longbow radar technology? If not, it won't be able to make it. BEL was also not able to make all the equipment of P8I which USA refused to sell due to COMCASA.
When simple communication equipment is used in C17 or C130, the difference of COMCASA is nil. Such generic communication can be done by any satellite based communication devices. But when radars and other complex signals have to be communicated, COMCASA becomes important
well Enquirer and you are both talking about different things
first point would be what's the point of buying something that other system in our inventory will not be able to communicate with !!
Our system do not support waveforms such as Trellsware TSM X MANET or L3's ISR full motion video or Sincgars, UHF LOS, havequickII so there is no point of buying stuff ( I am not sure about UHF Line of sight) neither do they support datalink such as link 22 or 16
In case of P8I I don't remember much now but I think the problem was when the harpoon missile was fired the radar that India had was not able provide mid course guidance/update to the missile because they didn't provide us strike common weapon datalink which is UHF and link 16.
It's better to have our own data link like BEL has rather then using someone else there are pro and cons but as our local defence industry develops it's better to have our own waveforms.