Peter Lothberg <roll@stupi.se> writes * > Dtatacom tests were performed in the 10/100 setup. Obviously * > the Fast ethernet switches had an advantage over the FDDI * > switches since Fast ethernet and conventional ethernet work * > with the same frame types. FDDI switches on the other hand * > has to convert ethernet frames to FDDI frames and vice versa. * > Todays NAPs in most cases are not 10/100 set up. It is more like * > DS3/100/100 setup where routers are feeding traffic into the Gigaswitch * > using FDDI and since HSSI and FDDI is using same MTU size, no * > fragmentation is involved. * * Both 10 and 100 ethernet use 1500 byte mtu. * * And remember that the characteristics of a loaded exchange is very * diffrent between ethernet and token-ring.

And then there is always the possibility to run 100BT in full-duplex rather than half duplex...

Asuming that you have a switch in the middle that can buffer the BW/Delay quota. How many of the 100Mbit ether switches has 4MB per port in buffering? (token out for lunch and the router buffers) ((and some fddi switches can talk full-duplex)) --Peter