Building exchanges that matter ..

>I am surprised, (well, maybe not), that you aren't concerned about
>the excessive overhead present in FDDI networks...

FDDI is not a WAN technology. Losing 20% of bandwidth of a 10 ft
piece of fiber is one thing. Losing 20% of bandwidth of a
$3M/yr circuit is quite different.

ATM as a LAN is probably ok, if it can compete with Gb Ethernet

In the smaller networks, GigabitE may well turn out cheaper than ATM,
but Ethernet will never have the design flexibility ATM does.

...and any technology which experiences performance problems at 40%
utilization will is questionable at best...