dmr@csli.stanford.edu (Daniel M. Rosenberg) (07/13/89)
I'm wondering about how payphones work. It seems as if there are three main types: old fortress phones, that require a coin before you can do anything. The coin "opens" the phone for you. These seem to be connected to payphone-type central office pairs. New fortress phones also seem to have special pairs (or are there four wires?) that run to the CO, but don't require a coin first. And COCOTS seem to have more regular lines, with a lot more equipment in the phone itself. What's on those two/four wires for fortress phones? How do they work? -- # Daniel M. Rosenberg // Stanford CSLI // Opinions are my own only. # dmr@csli.stanford.edu // decwrl!csli!dmr // dmr%csli@stanford.bitnet