The triple play has fundamentally changed the way telecommunications networks are used and now these networks must themselves reflect this multi-service transformation. Customer demands, market competition and technological development are the three driving forces behind the accelerated development of modern communication networks. Traditionally the telephone line has only ever provided voice but more recently this has expanded to include data, through the Internet, and in the future all types of TV broadcasting for the home will be delivered over the phone line too. This triple play comprising voice, data and video services has fundamentally changed the way telecommunications networks are used and now these networks must themselves reflect this multi-service transformation in order to function most efficiently. 4800 series MSAN uses a multi-service trunk framework and built-in multi-service transmission platform (MSTP) module with resilient packet ring (RPR) functions to provide efficient access, transmission and convergence of different communications types into a single packet-based form. It is an NGN-oriented access system that is also compatible with the PSTN network thus providing carriers with greater flexibility in constructing fixed-line networks while greatly lowering the risks in implementing next generation networks. It is therefore becoming many carriers´ first choice for the construction of fixed-line networks.