Inter-exchange media types

Peter Lothberg <> 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))