1. Can I use this with Cat7 cable? 2. Between my router and two cameras, I only have one Ethernet cable - can I use these to share one cable for two cameras? Will PoE work ? 3. Can I use this to split the Ethernet cable going into my audio receiver to connect my Roku ? 4. Can this device can run 2 cameras with different static IP's from a single line? For example, a 2 port switch powered by PoE and with PoE pass thru?