Optical communication systems from ZHR GLOBAL offer a number of advantages for the railway environment. The systems ensure complete immunity to electromagnetic interference, and problems arising from ground loops and electromagnetic radiation are totally avoided. Therefore the use of costly protection circuits is minimized. The network transmission normally consists of an optical fiber cable with PDH/SDH line terminal equipment and primary add/drop multiplexers providing access to the network. A large number of different interface cards are available for all railway applications.
Microwave links are an alternative to optical transmission. ZHR GLOBAL can provide equipment in all standard frequency bands, and detailed design of each section is carried out taking land topography, distances between stations, antenna location, and climate into consideration.
Sometimes existing copper cables must be used for sections of railway lines where the present infrastructure is to be used for still some time. In this case various types of modems, for instance XDSL types, can be applied in order to increase the amount of data transferred.
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