models?
--------------------------------------------------------------------------------

Paraphrased and modified from the page 1-1 of the ZyXEL User's Manual 
(Revision 2.1).  [page 1-1 in the on-line version]:

The U-1496 "Plus" models have a faster processor and more memory.  This 
allows the "Plus" models to have:
. faster speeds ZyXEL specific 19.2 kpbs (between two "Plus" modems)
. external "Plus" models support a 76.8kbps DTE rate (recent external
  non-"Plus" modems apparently also support the higher 76.8kbps DTE rate)

The basic feature, function, and operation of the "Plus" versions are the
same as the normal non-"Plus" versions.

Brent Mosbrook (brentm@zyxel.com) [ZyXEL USA] explains that in the future,
the Plus models will have 2 Mbit ROMs to allow room for "future enhancements".