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2. Operating elements
2.1 Operating mode
A connection (N ) is an association established to enable communication between at least two entities (N + 1) identified by their address (N ). A connection (N ) is a service offered by layer (N ), enabling the exchange of information between entities (N + 1).
A connection (N ) has at least two connection ends (N ). These connect three elements as shown in figure 9 .
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Operating elements
Main data transmission protocols
