Ultra-compact Design Just like in the automation industry, the railway sector is not only planning networks for new trains, but also modernising existing ones. Frequently, the space which is available for additional components is limited at the locations where additional Ethernet ports are required. The TERZ switches are the world's most compact M12 Ethernet switches and are therefore ideal for the cabinet-free decentralised connection of end devices. Thanks to the different number of port variants, the required cable lengths can be optimised and the installation effort can be reduced through decentralisation. The extremely small NITE-XS4 with 4 Ethernet ports are the ideal solution for retrofitting an electronic rear-view mirror system or outdoor cameras to monitor the flow of passengers while boarding and alighting at the platform. Another way to save costs for cabling digital end devices is to use Power over Ethernet (PoE). The transfer of data and the supply of energy are done together via the Ethernet cable. Camera systems and various sensors which support the PoE standard are increasingly found in the market. Due to the extended temperature range from 40 to +70°C, the switches can be mounted outside the control cabinet even under temperature fluctuations, for example below the roof or below the floor plate. The assembly of the switches is done directly on the mounting wall using M6 screws. The functional earth is connected via a separate wiring terminal, especially if the mounting wall is not electrically conductive and not grounded. The mechanical and electrical connection can be carried out independently of each other.
EN 50155 Conformity
meet the normative requirements over the entire service life.
In addition to the environmental and mechanical requirements for use in railways, strict specifications with regard to electrical properties must also be observed. The stability and tolerance of the internal power supply are crucial for a fail-safe operation. The NITE-XS switches have a high dielectric strength of 2.25 kVDC, between the 3 isolation groups: electronics, Ethernet ports and housing. The positive and negative poles of the power supply are thus isolated from the housing and the occurrence of unwanted earth loops is prevented. With voltage drops on the supply line up to 10 ms and fluctuations in the rated voltage of up to 40%, the switches run reliably and maintenance-free even after long use in the vehicle. All railwaycompatible Ethernet switches from TERZ meet the fire protection requirements according to EN 45545. This and all other standards such as EN 50155; 61373; 50121-32 were tested in an accredited environment. During development, it was ensured that the mechanics and the electronics operate together perfectly and so all electrical characteristics, such as the contact resistance between the shield and the housing or the bridging in case of voltage drop,
Reliable Data Storage
52
It is not just reliable network communication that is needed, however: because of the increasing digitisation and rapidly growing number of devices in the field, it is more and more necessary to store data directly in the application and transfer it to other devices manually, but this without the need for a network connection. Two possible scenarios could be uploading a configuration file for the commissioning of devices and system modules and evaluating sensor data or camera images. The TERZ KALIBER-XS1 M12 USB Flash Drives are the ideal plug & play solution and have been designed and developed for use in continuous operation under extreme environmental conditions. A high dielectric strength and the robust IP65/67 stainless steel housing enable the use according to EN 50155 at an ambient temperature of -40 to +70°C. However, it is not only the mechanical protection against external environmental influences which is important, but also the secure storage of the data. For this purpose, a fault-resistant SLC NAND Flash is used, which operates together with a powerful memory management to ensure maximum resilience and security in data storage. Over-Provisioning combined with high-performance Wear-Leveling and Error Correction Procedures (ECC), ensure extended retention of data and longevity of flash cells (Endurance).