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This paper reviews the functions of private automatic branch exchanges (PABX's) and describes the organization of the IBM 2750 Voice and Data Switching System. This system has two main functional areas: (1) line switching, transmission and signaling, and (2) common control. The switching network uses a new integrated electronic crosspoint. The common control is performed by a built-in duplexed computer with stored programs dedicated to line switching. The IBM 2750 offers a variety of normal and advanced voice features, and some entirely new data features, and is designed for interconnection with an IBM System/360. Four companion papers describe the electronic switching network, the network control program, and the integrated crosspoint in greater detail.
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