Before a brand new tunnel in Norway could be finished, all of the safety measures and equipment needed to be completed. It was essential that the newest tunnel would use the most up-to-date technology. For example, it was required that staff could monitor the status of the tunnel’s traffic in real-time traffic via the Internet.
Since the total distance of the network is greater than 100 KM and huge amounts of data need to be sent, the problem of bandwidth needed to be overcome. Copper Ethernet cable has a maximum range of about 100 meters, thus could not be a consideration. Therefore, the only alternative for the Ring Topology was single-mode fiber, thereby ensuring network redundancy and the transmission of data back to the control center for further analysis. They also needed redundancy and fast recovery if a node failed.
Due to the large number of modules ( for example Speed detectors, Smoke detectors, Temperature detectors, PIS LED information board, PoE IP Camera for real-video monitoring, Voice broadcasting system, PoE IP Phone, License Plate Recognition System and Traffic Light control) on this system a reliable network is essential for the system, fast redundancy network is a necessary function.
The tunnel’s intelligent transportation system (ITS) also wanted 24/7 video surveillance. Therefore, the operating temperature of the Ethernet devices and cameras must support wide temperatures and be of an industrial grade. Furthermore, since all the equipment would be outdoors, the entire mechanism must be able to withstand harsh environmental conditions. Normally, standard copper PoE switches only support 15.4W, but the outdoor high power IP Cameras use 25W to solve the power consumption problems.