I don't think the loopback cables are capable of this. To my knowledge this is dependent on the speeds supported by the port to which the loopback cable is connected. I would check the settings for the device in question. The same would apply to the 1000mbps (Gigabit) option, with the caveats stated in previous comments.
Wrong part of the problem.
I don't think the loopback cables are capable of this. To my knowledge this is dependent on the speeds supported by the port to which the loopback cable is connected. I would check the settings for the device in question. The same would apply to the 1000mbps (Gigabit) option, with the caveats stated in previous comments.