Electromagnetic compatibility problems in next generation networks

Next generation networks (NGN) have a number of features and significant distinction from that are being existed this time. There are differences between main and local lines faded. Frequency spectrum and transfer rate in main and local lines are the same. In next communication lines packet switching will apply instead of channel commutation. It means that different parts of the same document can be passed on different lines in different moments of time, whereas the terminal points are the same. It means for lightning protection, that probability of an accident from lightning strokes during the different moments of transmission time does not coincide, and transmissions immunity can change during passing. Traffic-carrying capacity can change by several digits during some seconds. It becomes sharper relationship with protection standards that can depend on traffic load. Frequency spectrum of radio access extends too in NGN. Last time there were significant successes made in studying of different influencing sources such as intra cloud discharges, discharges to ionosphere, disturbances from power electronics control installation etc. In this paper there are some features of NGN considered and corrections for lightning protection estimation.