Real Time Monitoring of Rail Track Status Using a Redundant Wireless Link
Trackside networks control and manage train networks with a complex infrastructure of railway signals, track circuits, and switches. Railway and station systems rely heavily on this infrastructure during their daily operations. Any network interruptions can create serious safety issues or financial losses. Typically, a large number of signal cables and wiring connections are used in a wide area to create a signaling system. Human error or cable theft is a threat to the integrity of the system and can cause serious damage to the system. In addition, multi-vendor systems with different proprietaries can quickly become costly and complex to deploy. Open standards-based WLAN technology has emerged as a solution that can replace traditional railway signal cables and can also manage track circuits, switch positions, and signals in real time.
• Easy deployment with multi-vendor solutions
• A widely distributed network that links to the OCC
• An AP architecture optimized for less cabling.
• Real-time monitoring of track circuit signal devices
• Compliant with trackside EMC standards.
Reliable On-board and Train-to-ground Wireless Communications
Automatic Train Operations (ATO) and Automatic Train Protection (ATP) greatly improve the efficiency and safety of train operations. In order to enable communications between train and trackside, CBTC (Communications-based Train Control) now uses WLAN as its basis. WLAN solutions have become a vital tool for inter-carriage and train-to-ground ommunications networks because they provide freedom from cabling requirements. With increased reliability and bandwidth, WLAN is also tapped to support on-board video surveillance, passenger infotainment systems, and train control, which are important components of ATO and ATS. Rolling stock is an operating environment with unique challenges; all equipment used onboard must meet EN50155 standards, including specifications for EMC, shock, vibration, extreme temperature, and humidity resistance.
• Seamless connections between ground and moving train
• Provide coverage within train carriages
• Flexible carriage changes and low maintenance
• Reliable real-time Passenger Infotainment Systems
• High throughput for real-time public address and video surveillance systems
• Compliant with critical onboard standards
Using Embedded Computers to Integrate Railway Systems
The communication network for each station in a railway line was independent and isolated from the other stations in the system, making it difficult for local sites, control centers, and third parties to manage and share important data and signaling information. This created a critical problem. To improve the system and provide smoother, better communication, embedded computers can be used to integrate railway station communication systems.
Backbone system for network redundancy
Built-in web server for real-time control and remote monitoring
Front-end communication computer for data processing and logging
Various devices must be well-managed and organized
Multiple communication ports for connecting devices
Easy development for system integration
Onboard WiFi for Trains
More and more people today use trains to commute to work or to go on business trips. Because people are spending more time on trains, onboard Internet service has become more and more important to help business travelers maximize their efficiency. These travelers demand high bandwidth so WiFi is the best solution for this kind of mobile communication. It is not very difficult to implement a local WiFi network on a train. However, connecting to the Internet can be problematic because WiFi is not designed for high speed vehicles travelling at speed over 80 km/h, such as a high speed train. Therefore, satellites are used to connect high speed trains to the Internet. Besides Internet service, railway companies can also use wireless technology to provide multimedia entertainment services.
Dual RF band
Real-time Status Updates for Mass Rapid Transit Systems
Security is an important issue in mass rapid transit systems due to the high volume of passenger traffic they handle. In the past, the status for the trains, platform gates, various alarm systems, and environmental controls were all manually recorded at the stations. But drivers, operators, and security personnel need more real-time information to handle emergency situations. With wireless technology, all this information can be transferred while the trains are approaching the station thereby improving the security level. Also, station operators can transfer information to arriving and departing trains, including the status of other trains and track conditions.
Real-time information updates and transmission between trains and stations
Reliability and redundancy to ensure seamless network connectivity
Central Control of Passenger Information Display System on Railcars
The biggest metro company in Taipei requires a PIDS (Passenger Information Display System) to enable central control of LED displays from the PIDS controller. The LED displays are serial-based and will be connected via a RS-485 network with linear multi-drop configuration. Conventional RJ45 connectors are not suitable for railcar applications where intense shock and vibration are frequent. EN 50155 rail certification will also be required for rolling stock PIDS application.
l EN 50155 certification for reliable operation in railcars
l Secure/robust installation to withstand shock and vibration
l RS-485 serial connections to save wiring and cable costs
Establish Robust and Secure Railway Networking
Railway transportation systems, often regarded as locomotive industry, are important in many developing and developed countries. For example, well-built highspeed railway infrastructure can bring rapid economic growth to an entire country. With such importance of railway systems, dependable safety management of railway traffic is absolutely necessary, calling for the need of rugged network capable of handling massive real-time traffic information accurately without interruptions. It is not easy, however, to sustain reliable network service in such a high-speed moving platform of high-speed railway, since data can be affected by the train’s fast speed and associated vibrations. Nevertheless, ORing, with industryleading expertise of industrial networking, has successfully provided the complete railway networking solution for the Beijing-Shanghai High-Speed Rail – also known as the Jinghu High-Speed Rail.
China Subway PIS
Overview Along with the fast development of China's railway networks, Passenger Information System (PIS) is becoming widely used in subway systems for bringing added value and convenience to passengers. The main challenge for installed equipment in network infrastructure is to transfer data fast and in real-time while resisting to harsh conditions, such as constant electromagnetic interference or shock that is so common in railway systems. A Subway operator in China has chosen to use Korenix JetCon 2301-m Fast Ethernet to copper media converters for building high-speed wireless PIS system to improve extended data communication.
UK Railway Station Security & Surveillance
Providing passenger safety and security in railway stations is highly important, leading to an increasing demand of building intelligent network systems. With a lot of video, voice and other data communication everyday, these systems should work stable, considering that the equipment intended to be installed on the railway environment may interfere with electric field line changes during train operation. Therefore, the devices must resist electromagnetic interference and ensure uninterrupted communication throughout their operation.
PoE switch enables reliable seamless Broadband connectivity on Virgin trains Korenix UK has been awarded a contract for the supply of 477 of its Korenix PoE (Power-over-Ethernet) switches to Nomad Digital, a UK-based provider of specialist mobile networks, for use on Virgin’s ‘Pendolino’ passenger trains. Terms of technical support and adaptability. For example, we required a special coating to be applied to the housing of the switch, in order to comply with rail industry regulations, which Korenix were happy to do. The switch was also competitively priced for such a high quality unit. Providing trains and other public transportation systems with the latest wireless broadband data communications is a rapidly growing market.