Station Identifier
J. Stepan · IRE Transactions on Communications Systems · 1968
This paper describes an end office tributary identifier which sends to a toll center the calling subscriber's directory number. It is arranged to interface with the Bell System's centralized automatic message accounting (CAMA) centers. The electronic identifier operates on either a terminal per line, a terminal per station, or mixed basis. In operating, it feeds an ac signal on the sleeve of the switch train and detects it at the line connector points using a matrix and electronic detectors.