@dinosaur, CPEs are designed for long range PtP links between two CPEs (one operating as AP, the other as client).

Why not wiring the first CPE to your Internet router directly? As for the wireless cams I recommend to connect an AP with omnidirectional antennas to the remote CPE.

Depending on your environment the 2.4 GHz band might be overcrowded, so it could be better to use a CPE510 instead (also preferred to avoid interferences between the cams and a standard AP).

This is the usual setup for this kind of connections:

@dinosaur, you're welcome.

A cable is needed anyway for power supply of CPEs. I didn't drill a hole in the wall, but used a gap under the roof and from there a cable duct to the machine room. Using a cable is best if one wants to use available bandwidth of the CPEs. A wireless repeater link will not only cut bandwidth considerably and work unreliably between a directional AP and an omnidirectional AP (due to different antenna characteristics), but also introduces even more sources for potential trouble such as the Hidden Node Problem.