The method involves the use of two different types of control device. The first and second control devices (CONTR1, CONTR2) work together to perform exchange functions and communicate with each other for this purpose. The first control device performs standard exchange tasks with control programs in real time. The second control device performs special exchange tasks using control programs in non-real time. The control devices are made up of a number of processing units (PU1-PU18) hierarchically arranged in two or more control planes. The processing units in different control planes perform different types of task.
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