Ethernet Hub?

[dnelson]

Hi Lyle,

The SE2500 comes with what is called a 'wall wart'. It's just a device that converts your household voltage down to 12V DC for use by the Ethernet switch. You'll probably just cut the cord off the "wall wart" and adapt that into your electrical system. Since you are dealing with DC (Direct Current) voltages, wou do need to be very careful about polarity. On the back of the switch where you plug in the power, you'll see a diagram of the proper polarity.

If you've only two devices, I don't understand why an Ethernet switch is needed. If that's the case, I would think you could use a "crossover" cable between the two units and be done with it. Does XM use Ethernet?

[NoahF]

Yep, you don't need a hub if you don't use XM. XM is ethernet based so it requires you to add a hub to the system. You could also get a 5V hub and have it powered from the auxiliary connector on one of the AFS boxes. The 5V is provided for GPS use but could power a hub instead as long as the current required by the hub is less than 0.35 amps. There was a recent thread discussing this as an option. If you used a 5V hub powered by the AFS box, if all ships power were lost, your AFS boxes and XM would still be talking. However, the amount of time that the internal battery would power the EFIS would decrease somewhat. You would need to do some testing to determine if the reduced endurance was acceptable for the type of missions you plan to fly.