Batboard

I've run across a couple of UHF CDM1250's with a model number I haven't seen before. They're AAM25SKD9PW2AN. These are 64-channel high-split UHF units. I haven't run across the "PW" in the model number before (every other CDM1250 I've seen is "AA" conventional). Anyone know what this represents for capabilities, and how it differs from the AA models?

Increased PPM (i.e. frequency stability) standards for base station operation the T Band IIRC