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From: phil@shl.com (Phil Trubey)
Newsgroups: comp.dcom.lans
Subject: Re: 10Base-T hubs
Message-ID: <1991Apr23.162135.7408@shl.com>
Date: 23 Apr 91 16:21:35 GMT
References: <1991Apr17.212748.7165@shl.com> <14740@darkstar.ucsc.edu> <1991Apr21.021222.947@engin.umich.edu>
Distribution: usa
Organization: SHL Systemhouse Inc.
Lines: 21

In article <1991Apr21.021222.947@engin.umich.edu> jal@acc.flint.umich.edu (John Lauro) writes:
>The hub would have to be extremely fast to bridge a large number of
>ports.  Assuming worst case...  Number of ports * the speed of ethernet.
>With 11 ports, you are talking about > FDDI speed. 

Not necessarily.  You could have a single high speed backplane running
at FDDI speeds, for instance, and use the backplane as the packet
switching bus.

Northern Telecom had (has?) a product out that did something like this.
They had a proprietary network scheme where each port (out of up to 1048 ports
I think) had a dedicated 2 Mbps.  The internal switching bus ran at 40 Mbps,
so your total 'network' throughput was limited to 40 Mbps.

Come to think about it, cisco Systems is doing this now with their cBus
architecture - they have a network bus running at something like 533 Mbps. 
-- 
Phil Trubey                     |  Internet: phil@shl.com      
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