IIRC they are seperate it wouldnt surprise me if each one was 800 or 400mA But you will have additional 12v connections other than hold off for example if you want to balance the loads
Polling is where a path (say ethernet or 4g) is polled every x seconds/minutes to check the path is actually available to deliver alarm events. The comms device sends a signal that is acknowledged and responding to. After x no of failures and event is reporting to the monitoring station of a total polling loss. This is then reported to the monitoring station as a total comms lost and is reported to the police if armed(on URN systems)
Sorry cant answer your main question but in this case does your neighours house have nest cameras etc? Id assume it was turned off to prevent these working too
Old man used to rally them with his dad, he was from Cumbria. Bought my sister one even tho I said it was a bad idea due to what I'd walked away from in newish cars. Had a smack nothing like my sort of scale, has plates in her arm was lucky too looking at it after, but did it handle for a little thing