I though that connecting the security camera system to the second router, it would be more secure since that is how they did it for my mom's house for her alarm system, not camera system.

OK, let me see if I have gotten this straighten out so please bare with me on my elementary knowledge on these items that you have just mentioned. I want to learn this because it is interesting.
  • If I use a cable to connect the 2nd router back to the Main router, and use its wireless, that is a WAP?
  • If I connect the 2nd router back to the Main router through wireless while the cameras (POE Clients) are connected to the 2nd router through cables, that is a Client Bridge? And the WRT54G might not support?
  • If I connect the 2nd router back to the Main router through wireless while the cameras (wireless Clients, not POE) are connected to the 2nd router through wireless WIFI, that is a Repeater?

If all of the above are true, what is the difference between a repeater and an extender?