[LUNI] Running 2 networks on same physical wire

[David Horton]

Jay Strauss wrote:
> Hi,
> 
> I need to have 2 computers sitting physically side to side to be on
> different networks.  I only have a single RJ-45 outlet.  The whole
> setup looks like:
> 
>             |-Router 1-                            |- Network 1
> ISP--switch-|                --RJ45 outlet--switch-|
>             |-Router 2-                            |- Network 2
> 
> The <blank> space between the routers and the RJ45 outlet is on
> purpose, because I don't know what to put in there.
> 
> The RJ45 outlet is upstairs, and the routers are in my basement.  I
> can NOT simply move the routers upstairs because there are numerous
> computers hanging off of the routers in the basement.
> 
> I'm not sure if what I want to do is possible or what equipment I need
> to get.  Any help/suggestions would be most appreciated.
> 
> Thanks
> Jay

If you are using 10/100 Mbit speeds, there are only two of the four 
pairs of wires used.  You can take the remaining two (the blue and the 
brown) and use them for the second network.  You'll probably need to 
build yourself a custom cable or splitter.  See this link for 
instructions on a DIY splitter 
http://www.makezine.com/blog/archive/2006/05/how_to_make_your_own_ethernet.html

Hope that helps.

Dave