Self-healing ring rail transit PIS vehicle network system solution
The rail transit PIS system is a system that provides information services to passengers by relying on multimedia network technology, with computer systems as the core, and stations and vehicle-mounted display terminals as the medium. Under normal circumstances, the PIS system provides passengers with operational information such as boarding instructions, first and last train service times, train arrival time, train schedules, administrator announcements, and other public media such as government announcements, media news, live broadcasts, and advertisements. The information is used in a coordinated manner; in an emergency, in accordance with the principle of preferential use of operational information, dynamic auxiliary prompts can be provided to enable passengers to guide the correct service information and ride the rail transit safely and conveniently. Use Ethernet to collect and transmit monitoring data and video signals to improve the security of the network and ensure the reliability of the system network; transmit the data to the control centers in a timely and error-free manner. Due to the harsh environment at the site of use, there are very high requirements on the material and performance of the product. Not only the standards of vibration, jitter, wide temperature, humidity and power supply system, but also the reduction of communication quality caused by electromagnetic interference. solution: The MIE-5008 product provides two 10 / 100M ring network electrical ports for transmitting video, audio and other data through a single network. In addition, it can form a self-healing ring network, using MR-RING high-performance redundancy technology, when the train network When a fault occurs, communication can be quickly restored within 20ms to ensure reliable and stable network operation. It avoids the loss of data transmission when the single-channel network is interrupted, and improves the reliability of network communication networking. The IGMP Snooping function of the MIE-5008 self-healing ring 100M industrial Ethernet switch can support video multicast data well, reduce the communication burden of the video server, improve the utilization rate of network transmission, and greatly optimize the network for data. Real-time and reliable transmission provide a guarantee. The cascade connection between train cars and cars adopts Port Trunk redundancy technology. In addition to link redundancy, Port Trunk technology also has the functions of load balancing and network bandwidth increase, which overcomes the traditional RSTP and redundant ring network technology bandwidth utilization Not high deficiency. In addition, the use of Port Trunk not only facilitates the connection between the carriages, but also fully meets the needs of flexible grouping of carriages. The MIE-5008 series of self-healing ring industrial Ethernet switches are specially designed for the on-board trains of electronic equipment. They not only include aEMC requirements, but also have standards for vibration, jitter, wide temperature, humidity, and power supply systems. The ring network port is compatible with the IEEE802.3 standard, with multiple LED indications such as power failure alarm, data LINK, etc., and a power supply safety alarm signal, so that the monitoring personnel can keep abreast of the operation status of the equipment. MIE-5008 products can fully meet the different needs of various rail transit networks.
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