Lol... yes I'm aware. My wife worked at a lawyer's office where they still had a manual switchboard. I was fascinated by this. I'm aware of what tip and ring are. I got a degree in electrical engineering.
Then SINCE you have a degree in electrical engineering, you SHOULD know if you do NOT know your circuit, how it works, it's electrical requirements and WHY it has those requirements, YOU WILL BE LOST (dumbfounded) when trying to identify, locate and/or repair a trouble.
Right now, you are TRYING to argue with me about TWO particular characteristics of alternating current that EVERY electrical engineer SHOULD know. Either you had a TERRIBLE teacher or you didn't pay attention. Knowledge of something and actual application of that knowledge are two totally different things. Apparently, you did and/or don't have the knowledge to even APPLY what I'm telling you.