| The global telecommunications industry is undergoing fundamental transformations from circuit switched networks towards packet networks led by technology and market forces. Since the growth in data traffic has caused most of the expansion, it impels the carriers necessitating a convergence of voice and data networks to improve the use of new infrastructure, minimizing investment and operations costs. Today's Public Switched Telephone Network (PSTN) could be consolidated through Internet Protocol (IP) and Asynchronous Transfer Mode (ATM) technologies, resulting in additional operational saving. What's more, with the development of technology of IP technology, enhanced services such as e-business telephony based www, proxy service, universal mailboxes, personal identified call, and video telephony service will feasible in the market through integrated access and all kinds of feature servers. Therefore, at present .service provider are interested in exploring the consequences of providing multiple services over a single integrated switching and transport network based on Asynchronous Transfer Mode (ATM) or Internet Protocol (IP) .The technology of Voice over ATM (VOATM) and Voice over IP (VOIP) will play a more and more important role in the evolution of telecommunication networks.First, this thesis introduces some kinds of fundamental packet voice theory: VTOA and VOIP .There are two key factors to effect voice performance of packet networks: the mode of voice data adaptation and the control processing oftransporting stream of voice packets. The study is based on the simulation.The simulation mainly includes time-delay and loss rate of voice packets in the states of different load of the same line.Based on the real-time transmission problem discussionj designed a software about voice meeting.using winsock and RTP. At last, this thesis briefly describes the architecture of next generation telecommunication networks supporting multi-service including voice and data.
|
PDF Full Text Request