Multi-Media Multi-User Service for the B-ISDN

摘要

Much effort is currently being invested in the design of the Broadband-IntegratedServices Digital Networks (B-ISDN). A description of the required functional behavior of the B-ISDN, in the form of an abstract and unambiguous service specification, is required as a common reference for the design. A first version of such a service specification, not available up to now, is provided. The presented service provides multimedia and multiuser communications. A call model, which underlies the description of the service is presented. It utilizes the concept of service component. A service component is characterized by its information type and the functions it performs on the information. In the actual service description, service primitives, their parameters, and their mutual relations (i.e., possible sequences) are given. Examples illustrate that it is easy to establish a simple telephone call, but that more complex calls have the inherent property that their establishment requires a lot of interactions between the communication system and its users.