Why Ethernet Shield v6 uses a RJ45 with 10 pins ?

I’m trying to assemble the Arduino Ethernet Shield Rev. 6.
I’m having difficulty to locate the proper RJ45 connector with 10 pins.
I need help in order to specify the right connector.

Eric V. Barreto.

I don't think it's a 10pin jack on the "ethernet" side, but in order to implement the Power-over-Ethernet capability, the connector has to provide both a filtered signal output ("with magnetics") as well as a "raw" (rawer, anyway) output for the power. So it has more pins coming out than it has going in. Silvertel (who makes the PoE modual) has a list of compatible jacks here: http://www.silvertel.com/poe_magnetics.htm

I'm not sure which one the Arduino shield actually uses.