Adafruit Patch shield for Arduino
Adafruit Product Code: 256
The shield comes with 4 breadboard-friendly satellite headers. To connect, use any off-the-shelf Ethernet cable. On the shield itself, the sockets act as a patch bay so you can quickly try out different wiring schemes. We think this design will come in handy!
The patch shield kit comes with one main shield PCB and four satellite PCBs as well as all the components necessary to assemble. It does not come with an Arduino, Ethernet cables, breadboards or additional components. The kit is provided unassembled, but its fairly simple to put together and should only take about an hour using the very nice instructions