I have one more question that is related. I am concerned about what will happen if the CAN driver is plugged into an Ethernet adapter. I didn't say this before, but the twisted pair pinouts for T568 and CAN are the same, so a standard Ethernet cable will work, pinout-wise. I used an Ohmmeter to measure the DC resistance of the transformer windings of an RJ45 with the integrated magnetics. I was reading about 0.8 Ohms between pins 1 and 2, and the same between 3 and 6. Looking at the data sheet for the SN65HVD255, I am having trouble understanding which parameter would represent CANL being shorted to CANH by 0.8 Ohms. Using the spec for the Dominant Short-circuit steady-state output current of 160 mA, the power dissipated would be 0.16*0.16 * 0.8 = 20mW, which doesn't seem like a lot of power dissipation. Am I looking at that correctly?