Prior to the introduction of the Integrated Services Digital Network (ISDN), traffic engineering for this new technology required considerable guesswork and over-provisioning due to the lack of reliable information concerning customer characteristics and behavior. Considerable field experience with ISDN now exists and detailed studies of user behavior are possible. Measurements of actual user-network interactions can be used as the basis for generalized models that can then be incorporated into traffic engineering procedures. Some examples of non-ISDN measurement studies that have been broadly used for traffic modeling can be found in [5,6,10,11]. In this paper we describe the results of a measurement/modeling study focused on an office automation application on an ISDN. Summary statistics for the users are presented; additionally, the measurements are used in the construction of a canonical model of the packet arrival process generated by a single user.
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