Well..the box would be the FMC, I really think that the question, did it give prox warnings should have been a clue...
You are killing me here... The required obstacle clearance is 1000 feet in non-mountainous terrain and 2000 feet in designated mountainous areas.
http://www.faa.gov/about/office_org/...50d_signed.pdf
The box, okay the FMC, has the segment ROC programmed in...its min segment altitudes...
what do you think the prox warnings are based on?
There is the foundation of the regulations, and the flight management systems on the aircraft.
There is also the precipitous terrain prediction within the FMC that must be accounted for in the procedure design, perhaps that is for another day...