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  3. January 2006

Re: Practical Limits

On Thu, 12 Jan 2006, Pat Barber wrote:


I don't recall seeing a book on the subject, but what are the
practical limits to a single ethernet adapter supporting more
than one remote location ?

In the event of more than one ethernet adapter, do you use more than
one DSL line or do you use a "smart switch" and bring all traffic
through a single line ?

I have a customer that wants to start using DSL at remote locations
and I'm getting concerned about how much traffic a single adapter
can handle.

A typical site would be 1-4 terminals and 1-2 printers(2380)
A single 100Mbit ethernet card can handle somewhere under 100 megabits of data per second (the maximum is 100 megabits per second, but that limit is not always easily reachable). Few DSL connections exceed 1 mebagit per second, most are somewhere just less than that. But assuming all the remote locations had 1 megabit DSL connections are your internet connection was the equal of your ethernet card (i.e. 100 megabit - very unlikely and very expensive) then you could support 100 remote locations with each location totally saturating their DSL connection. This is the maximum and very, very unlikely situation.
We support 17 remote locations with an average of 10 printers+terminals in each location. We connect to the internet with a partial T1, giving us 768 megabits of bandwidth in each direction. All the remote locations have DSL. We are nowhere close to hitting the limits of our hardware. 

James Rich

It's not the software that's free; it's you.
        - billyskank on Groklaw

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