By chance, I watched a few episodes of 911 and kept thinking that it was all completely unrealistic nonsense. Then there's an episode where the entire emergency

By chance, I watched a few episodes of 911 and kept thinking that it was all completely unrealistic nonsense. Then there's an episode where the entire emergency call system for LA goes down, and even though there were different reasons in the episode (a transformer fire), I couldn't have imagined that it was actually possible to completely disable the emergency call system (and what else) of a city.