Image No 4 BSUs with a backhaul electronic communications network The structure of a FTTH network indicated in the lower part of image No 5 and the structure of a FTTB network in the upper part of image 5 enables ensuring long-term sustainability of investment through a simple change of the active network elements at the FTTB central point and at the terminal points of the FTTH network. Due to the minimal difference between the indicated technologies they are referred to as FTTH networks in the text below. Image No 5 Structure network FTTH of a The structure of a FTTN network, where metallic lines are used for the section of the connection from VDSL2 the central point to the terminal point of the network, Fibre optic C P Network which have limited access speed possibilities in E C P combination with currently available technologies, E CPE Metallic pairs DSLAM < 500 m given the combination of the length of the metallic outdoor cabinet Image No 6 Structure of a lines and the technology used. To a certain extent it is FTTN, respectively possible with the use of other new technologies to FTTCab network accelerate access speed, as is clear from the following image. DSL modem Graph No 10 Technology improving the performance of metallic lines depending on distance from the network terminal point, NOKIA 2016 45