And some systems set up tiers as this-
Tier 1 Public Safety Interop/Mutual Aid
Tier 2 Public Safety
Tier 3 Public Works etc
Orrrr
Tier 1 County Public Safety
Tier 2 Municipal Public Safetly
Tier 3 Public Works Type Agencies etc....
With certian model radios on maybe 1 Tier, others on 2 Tiers, and yet others on all 3
Motorola defines not in tiers for radio models but actual models.. Model 1's are basic radios, Model 2's have limited special functions. Model 3's are your full function with keypad etc...
Examle XTS2500 Model I, Model II, and Model III
But the way that PDF explians it does seem to make one think that they will be capable of P-25 Phase 2???