The performance of any system should always be examined from two aspects. A typical user is not concerned with how the provider achieves the meeting of demands upon a particular system service or how the internal structure of the system is designed. This also holds for communication systems and networks. The network user is focused on services consisting of the performance of particular applications (electronic fund transfer, file transfer, text communication, for example), on perceivable effects, objective measurements and intelligibility. From the service provider’s point of view network performance should enhance network development, planning, operation and maintenance.
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