Radarspod - I accept your invitation!
Capt Pit Bull - You could have stated your background a bit earlier...
I will concede that
elementary mode s is required for tcas2, but i promise you that from an atc standpoint, that is viewed as not having mode s. We get no information from it and it doesnt help us in any way.
Perhaps the original question should have been posed in an engineering forum rather than an atc one?!