The "7AN", as you may well know, is the last 3 of the model #.
7 is the (keypad) feature level (used to only be 5 or 6 on the portables - as per the original moto documentation, prior to many subsequent revisions),
A was model revision level, and
N was the model package identifier.
There are a great many threads on here regarding capabilities, and many of them show how the radios capabilities changed during it's lifespan and support by moto...to the point that the later official moto released hardware contradicted or wasn't possible according to their own literature. The 7AN HT1250LS+ that I have is
160 channel UHF + advanced signalling (QCII dec/enc + full MDC support + and some other stuff) that if you looked at the moto sales / support stuff - shouldn't exist together.
I'm not going to rehash all the stuff that happened prior to us getting them back from the factory like that, but the higher that 3rd to last numeric digit is - the more goodness is inside it.
View attachment 141033
Now that's a screenshot from one of the last DSMs released for that line, and it doesn't show 7.