This thesis describes the procedure of data collection and the setting up of a system for unified management and conservation of data on telecommunications infrastructure. The reasons and the purpose of setting up a common database in the company Telekom Slovenije d.d. are specified in this thesis as well as the problem of the outstanding documentation and the collection of these documentation in the field using mobile geographic information systems. A test data collection using a handheld GPS receiver MobileMapper CX was carried out within the functional location (FL) 1158 Gradišče nad Pijavo Gorico
