A simple analysis of copper local loop faults in FTTB environment

This paper introduces a very simple testing scenario for detecting of faults in copper local loop that remains in access network after replacing copper wires from CO (Central Office) to DP (Distribution Point) with optical fibres, i.e. after implementation of FTTB (Fibre to the Building/Basement) solution. The scenario can be useful at first for quick and quite reliable loop troubleshooting, and in particular cases for loop qualification. The first part of the paper gives a short overview of copper loop model in DSL (Digital Subscriber Line) environment, its lead testing scenarios and FTTB solution. A main steps in fault analysis and testing scenario description follow. Below that, a discussion proposed scenario usability and reliability is provided. At the end an experimental verification of the scenario, which is based on data collecting on physical system in commercial exploitation is done.