Is the DP760 using the Network cord for PoE only or that is how its communicating with the DP752?
I seem to remember that you only interview over the air.
Yes, it is a repeater, so the communications between the two relative to the handsets is over the air (OTA). The cable is also used for provisioning, firmware upgrades and monitoring.
It would be a nice feature it would allow more range and probably more then 2 simultaneous calls.
I agree, but I am guessing that as a repeater, the device sees it as 4 calls. the 2 inbound from the source and then the 2 outbound to the handset destinations