[2749] in North American Network Operators' Group
Re: Inter-exchange media types
daemon@ATHENA.MIT.EDU (Peter Lothberg)
Tue Apr 30 15:59:45 1996
Date: Tue, 30 Apr 96 21:56:46 MET DST
From: Peter Lothberg <roll@stupi.se>
To: Marten Terpstra <marten@BayNetworks.com>
Cc: ipasha@sprintlink.net, Hank Nussbacher <hank@ibm.net.il>, nanog@merit.edu
In-Reply-To: Your message of Tue, 30 Apr 1996 15:49:05 -0400
> 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
