Telling models apart?

I was just looking all over my Audiotron and I can't find anything
telling me which model it is.  What's the best way to tell?  If it has
telephone jacks on the back does that mean it definitely supports
HPNA?  The original box does mention HPNA 2.0 support but I'm not sure
if that's a definite either.  I've never used anything but Ethernet
with it.

I think I recall that the AT100 supports Ethernet only, and the AT101
supports Ethernet and HPNA.  Is that right?  Was there an "AT
Classic"?