When you use the Pulse Electronics Network PULSEJACK JXD0 RJ45 connector, you may see that the number of pin on the connector is not matched by the electrical connection drawing. This is noted on datasheet: “Pin not electrically connected and may be omitted, see electrical drawing for omitted pins”.
Using JXD2-0015NL as an example, the electrical schematic drawing is below.
Pin 10 is not used and not connected to the magnetics of the part, so it is not shown on the drawing.