Computer Engineering

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Browsing Computer Engineering by Author "Abrha, Bewket"

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    ASSESMENT OF NEXT GENERATION NETWORK, SERVICES AND MIGRATION STRATEGIES The Case of Ethiopian Telecommunication Corporation
    (Addis Ababa University, 2005-08) Abrha, Bewket; Ayele, Hailu (PhD)
    The development of telecommunication systems during the past two decades has been from the circuit switched towards the packet switched paradigm. Initially a distinction was made between telecommunications and computer networks which is hardly applicable in today's reality. Incumbent network operators are running legacy circuitswitched telephony networks which inhibit them from enjoying the benefits of packet switching. Many operators have now started the paradigm shift in the telephony network by moving to packet based technologies. This new approach is often called Next Generation Networks (NGN). According to ITU Next Generation Network (NGN) is a packet-based network able to provide telecommunication services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies. It offers unrestricted access by users to different service providers. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users NGN enables the network operators to run all services on one network, i.e. voice, data and video. In this thesis the transformation of the legacy network to NGN in general and the Ethiopian Telecom migration in particular will be examined. This work reviews the evolution of voice telecommunications and attempts to analyze the network and service point of view as the industry migrates from circuit switched networks to packet switched networks. For the network part, the work tries to asses the legacy PSTN network elements with the NGN softswitched network. In the service part, a service modeling tool from Alcatel have been used to analyze and model next generation network services for the case of Ethiopian Telecommunication Corporation