I. Overview
With the development of rail transit, a large number of high-speed railways, subways, and city rails are shuttled between cities and cities, providing passengers with fast, convenient and high-capacity means of transportation. With the development of the wireless network era, higher requirements have been put forward for rail transit, and special vehicle-mounted wireless network multimedia servers are required to meet the passenger demand.
Second, the system description
The rail transit vehicle-mounted wireless service system is a special system developed to meet the needs of passengers in the process of traveling in the wireless network service developed for the characteristics of urban rail transit operations. It can provide large capacity, stable and reliable multimedia video on demand, high-speed wireless for urban rail transit. Internet service. Passengers are connected to the vehicle-mounted wireless multimedia system through mobile phones, tablets, and laptops to browse, order on-demand massive amounts of video, and obtain real-time traffic information such as vehicle speed, arrival information, and vehicle location, as well as broadband data access through wireless data channels.
The vehicle-mounted wireless multimedia service system can simultaneously establish a real-time wireless data transmission channel between the control center and the operating train for the vehicle-mounted video monitoring system and the on-vehicle passenger information system. The vehicle-mounted CCTV system wirelessly uploads data channels through the vehicle-mounted wireless multimedia service, and uploads the passengers' vehicle video information collected in the train cars to the control center in real time. The vehicle-mounted PIS system can obtain massive video information through the wireless multimedia system in the vehicle, and can also pass wireless. Downstream data channel to obtain real-time data, real-time playback on the car LCD display.
Third, the system requirements
According to the requirements of EN50155 rail traffic standard, it can adapt to industrial-grade equipment operating under strong electromagnetic interference environment
Meet the long distance transmission requirements between five types of trains between trains
设备Stable operation of the equipment in a long-term vibration environment
Support for non-blocking transmission of large volumes of data
Fourth, application block diagram
Figure 1 Rail transit vehicle-mounted wireless multimedia service network
Fifth, product plan
Figure 2 TRW-8371 Car Wireless Gateway Server
TRW-8371 is a new generation of train wireless gateway service application launched by EVOC Intelligent Technology Co., Ltd. The TRW-8371 has up to 5 wireless network access capabilities and supports wireless protocols such as 3G, 4G LTE and WiFi. After testing, WiFi access can reach an effective bandwidth of 160Mb or more, and a WiFi hotspot can be set up to meet 200-300 accesses. The maximum of 4 channels of 3G/4G wireless broadband access can implement different network protocols such as TD-SCDMA, WCDMA, CDMA2000, and LTE. It can also achieve load balancing of wireless links through software routing and provide passengers with large-capacity bandwidth. The built-in high-performance processor can meet the needs of hundreds of HD and SD video on demand.
VI. Advantages and features of TRW-8371 products
Intel@i5 2515E 2.5GHz, 4GB DDRIII
2*M12 10/100Mb network, 1*RJ45 10/100/1000 Mb network
SSD or HDD optional
DC110V special power supply for railway vehicles
 Optional battery backup
802.11n wireless network card, 3G/4G wireless module optional
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