I was just setting the environmental expectations the American phone network. The real disruption was the move to data networks. Architectural I think AT&T need

I was just setting the environmental expectations the American phone network. The real disruption was the move to data networks. Architectural I think AT&T needed to set-up an out of band channel to control the network separate from the data channels. This channel I think was the A channel of an ISDN line which had 2 b channels. I once had a Cabbie in NYC tell me about Citibank getting the first Fax Machines installed in NYC. They connected the Manhattan Office tower with the Queens office. They remember it getting installed and there was a long lang time before anybody used. The opinion was that it didn't make sense compared to all the better ways to move documents.