Study on Physical Network Separation Method and Maintenance System Composed of Optical Cable in Buildings

摘要

The network should be separated to protect internal data from external hacking. In other words, it would be separated from the Public Domain Network connected to the external Internet and the Private Domain Network for the internal intranet to increase security. In this case, the configuration of another physical network is classified as logical network separation by classifying internal and external traffic with software technique. Basically, the network separation started with security emphasized. However, as recent IoT technology has been developed and applied to buildings, many items that need to be separated from the outside building occurred in a building itself. As one of typical examples, CCTV images inside a building should not be exposed to external hackers. Data and signals for building control are also the same. In this paper, physical network separation with relatively high safety using the optical cable network which was already installed in a building is explained. Also, the line configuration is introduced to improve the reliability of the network, the test method and the analysis algorithm of the state of the optical cable.