The router is one of the first things I put on a UPS. The telco equipment likely has fallback power as well. Sure, you could find some device that isn't on a b

The router is one of the first things I put on a UPS. The telco equipment likely has fallback power as well. Sure, you could find some device that isn't on a battery backup and ping it regularly. But this approach forces the device on your UPS to shutdown as soon as power is lost. That buys you a clean shutdown, but you don't get the added benefit of being able to run without interruption during a brief brownout.