Hi,
1. You would have to set your IP to static and only then you would be able to reach TRB140 in the subnet. As you're getting the operator provided IP through Bridge mode - automatically it's impossible to reach 192.168.2.1.
2. You cannot shutdown the TRB140 as it powers immediately from the power supply. To shut it down you would need some kind of controller in between the power source and the device itself.
EB.