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From: jim@syteke.be (Jim Sanchez)
Newsgroups: comp.protocols.tcp-ip,comp.dcom.lans
Subject: Re: When is an ethernet full?
Message-ID: <1109@syteke.be>
Date: 30 May 90 07:16:22 GMT
References: <1141@cica.cica.indiana.edu>
Followup-To: comp.protocols.tcp-ip
Organization: Hughes LAN Systems, Inc - European Support Office
Lines: 21

One thing you want to be SURE and remember is that the ethernet on
broadband stuff has a significant distance limitation.  If your campus
cable system is a as large as I suspect, then the 10broad36 channel is
probably working more as csma than csma/cd and the effective channel
capacity is ~2 Mb not 10 Mb.  That is why we use 802.4 for backbone
applications it also uses much less bandwidth.  The UB stuff is also
just CSMA (if my memory serves me).  In both cases, the effective
channel capacity is approximately 35% of the data rate.  If you
calculate the maximum number of packets on an 802.3 channel it is
about 13,000 and scale accordingly I don't think you are overloaded
based on your numbers.  However, this is a tricky thing to find out.
-- 
Jim Sanchez          | jim@syteke.be (PREFERRED)
                     | OR {sun,hplabs}!sytek!syteke!jim
Hughes LAN Systems   | OR uunet!mcsun!ub4b!syteke!jim 
Brussels  
-- 
Jim Sanchez          | jim@syteke.be (PREFERRED)
                     | OR {sun,hplabs}!sytek!syteke!jim
Hughes LAN Systems   | OR uunet!mcsun!ub4b!syteke!jim 
Brussels