A frequency-modulation digital subset for data transmission over telephone lines

Modern business is embracing automation. In the business field, automation is often termed integrated data processing (IDP). This involves the use of large-scale digital computers as fundamental elements in the bookkeeping and routine activities of business. The communication system role in IDP is to transmit digital data from one location to another. This may involve sending data from subsidiary centers to a processing center or it may involve transmission of data from the central location to other business offices. The telephone companies are especially well fitted to handle the needs of business customers in this field because of their well-developed wire line distribution networks. The Bell System expects to offer digital transmission services over normal telephone lines. This is the Bell System Dataphone Service.