Matching communication facilities to data processors

There are a number of problems which arise when data-processing equipment is to be connected to communications lines in real-time systems. Four different solutions, utilizing essentially three basic approaches, consisting of (a) a system modification, (b) an addition, and (c) an independent stored-program device, are discussed. Each has certain advantages and disadvantages, and the choice depends on the system complexity and size, information flow rates, and the central processor requirements.