Hi,
I would categorize all switches that can be
stacked as
stackable. The Extreme Networks
product web site seems to agree mostly. That would make the X650-24x
stackable.
The
standalone switches listed there cannot be stacked (with the exception of the SSA, which is listed under both
stackable and
standalone, perhaps because of the name
S-Series Standalone (SSA)).
All of the
stackable switches can be used as
standalone switches as well, stacking is just a possibility.
Thanks,
Erik