The DP760 has to be in the RF coverage of the DP750. It’s working purely under DECT protocol.
The Ethernet port on DP760 is not necessary for an DECT repeater, which is only used for manage itself (pair with DP75x, upgrade, provisioning, etc), therefore, you will find a lot of DECT repeaters in the market don’t even have an Ethernet connection. (DP760 is the only DECT repeater I know that has a ethernet connection, you can consider an repeater with Ethernet port is an manageable repeater, without is a dump repeater.)
Here are some advise:
- For better RF range, you can choose DP752 with DP730 that has optimized the RF range.
- If you can put the DP760 at the edge of the DP75x RF range, and the extend RF range of DP760 can cover the other building, you can give it a try, I don’t know how far away they are, and the RF range will be vary in different physical environment.