Letter Re: Observations on a Tour of a Telephone Company Central Office
Hi Jim, I just came back from a tour of one of our local phone company’s central office (CO) and this is what I learned: Besides finding out how our phone lines work, I found out that the hardware there runs on 48 volt DC power. There is a large battery bank in the basement and the batteries are charged by the grid. It is made up of large clear cylinders and you can see the acid level and the plates inside. In the case of the grid going down it has a generator back up. Many of these offices …