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Ethernet cable side switch

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xvibe

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I want to design a switch for commuting two fast ethernet cables for one port.
The scheme is like this:

Code: 
PHY 1 ----> Transformer ---> 
                             \                  
                               Switch  ---> Transformer ---> RJ45 connector 
                             /
PHY 2 ----> Transformer --->

I want to avoid using a relay for the switch.
I have some Pericom analog switches that are used for this proporse but I think that they must be used between the PHYs and the transformer. The devices are PI3L301DA.
Can I inject a DC signal to the transfomer to clamp the ethernet signal so that I could use the Pericom gates? And how about the impedances of the ethernet signal? Should I terminate the signal with proper resistors?
 

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