8 Railway Wireless LAN Solutions > Industrial Wireless www.mo xa .c o m Introduction to Railway Wireless LAN 8-3 Rail Signaling Introduction to Railway Wireless LAN Recent advancements in wireless technologies have made mission- critical mobile networks, such as railway train-to-ground applications, a reality. In addition, increasing passenger expectations to be able to use various personal mobile devices while in transit have also prompted railways to invest in onboard Wi-Fi technologies. In order to create train control systems that are more efficient than traditional track circuit systems, CBTC signaling systems need continuous bi-directional track-to-train data links that use radio communications. These requirements are especially important in high- speed applications, for which roaming occurs very often, but moving Today, rail operators can improve passenger experience by offering onboard multimedia content, free Internet connectivity, and complete network security throughout the entire train. The infotainment network must be flexible enough to adapt to train consist changes during daily operations, while communicating to the ground-based backbone network through radio links, or to the control center through a satellite connection. Moxa provides three EN 50155-compliant product series for various railway applications: • Rail Train-to-Ground (RTG) series and TAP series for train-to- ground communications However, electrical equipment used in railway applications are also subject to strict industry standards. In particular, wireless equipment used aboard rolling stock need to comply with the EN 50155 standard, which requires an extremely rugged design to resist power input voltage fluctuations, power surges, ESD, and continuous vibrations. block signaling systems still need sustained communications between fixed and mobile equipment. However, WLAN handoffs may affect latency and cause disruptions in communications that is unacceptable for safety-critical applications. Besides, with the increasing demand on onboard Wi-Fi access, wireless APs need tailor-made features to ensure that every passenger is able to access multimedia stations or the Internet. This kind of service requires greater bandwidth, and secure network access, especially when connecting with backbone systems. • Wireless Access Controller (WAC ) series to work with the RTG series • Rail Carriage-to-Carriage (RCC) series for onboard wireless communications The RCC series includes onboard wireless products for passenger Wi-Fi networks and carriage-to-carriage wireless communication. For Wi-Fi networks onboard, our bandwidth usage optimization features provide a smoother Wi-Fi experience for passengers, even in crowded carriages, and client isolation for a secure network connection. For carriage-to-carriage communications, the innovative Moxa ACC (Auto Carriage Connection) technology supported by the RCC series provides simple wireless deployment and increases the reliability of wireless carriage backbone networks. Moxa’s train-to-ground solution includes wayside access points and onboard wireless client products. Working with a wireless access controller from the WAC series, the innovative Moxa controller-based Turbo Roaming technology ensures millisecond level handoff times to meet the demanding requirements of mission-critical railway applications, such as CBTC. Moreover, the AeroLink Protection technology offers wireless redundancy by creating multiple redundant paths from the train to the ground for a highly reliable connection. Onboard Infotainment Moxa EN 50155-Compliant WLAN Solutions Onboard Communications: ACC Technology and Passenger Wi-Fi Train-to-Ground Communications: Turbo Roaming and AeroLink Protection Technology Auto Carriage Connection ACC