Organization of communication between the center of an automated system of information exchange and the subscribers to the system is described. The three requirements are: (1) those technical communication means must be chosen which will provide effective and convenient avenues for calls from the subscribers to the center, (2) the required equipment system must be determined on the basis of a technical and economic analysis and (3) the amount of equipment of a single type must be computed depending on the system load. The structural system for organizing this type of communication includes several devices which fall into three classifications: subscriber equipment, switching equipment for the subscriber nets, and computer equipment. A block diagram of the equipment involved and their interconnection is given. While the article is not highly mathematical, several formulas are presented: one for determining the number of subscribers that can be serviced by the system and another for determining the subscriber load for subscriber call channels. The article includes: five figures, five formulas and one table. (Author/MF)