Operational Program for the IBM 2750

This paper describes the operational program of the IBM 2750 Voice and Data Switching System. The program runs in the supervisor unit of the two network controllers used in the 2750. This program controls: (1) the duplexing of the network controllers; (2) the switching network; (3) the data collection and transmission operations passing through the system, including interconnection with IBM System/360; (4) the on-line error handling and system testing. The IBM program uses all available core storage. It is flexible, is tailor-made to each customer's requirements, and runs continuously without customer assistance.