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The infrastructures of Smart Cities presuppose the existence of a basic IT data transmission network. This is also true for point-to-point connections between protected spaces in potentially different locations. The establishment of a stable IT connection is an essential element in the development of information infrastructures. Transmission bandwidth is a basic parameter to show the functionality and usability an IT system. As a result of advances in fibre-optic data technology, fibre-optic data connectivity solutions have now become standard tools, and due to their features, other technologies used for long distance connections have been almost completely eliminated by this technology. Continuous operation of fibre-optic connectivity has become vital to the operation of Smart City devices, as well as to the continued stable operation of critical infrastructures and protected spaces. Thus, the failure of an optical fibre requires immediate troubleshooting and corrective action from the operator. The scope of this research includes the basic methods of fault detection with regard to optical fibres, from simple methods to testing with the Optical Time Domain Reflectometer as a basic and important measurement method in the operation of optical data communication networks.

Monitoring Optical Data Connection between Protected Rooms in Smart Cities