1、 PIS system introduction: Passenger Information System, abbreviated as PIS. It is a service system in the subway that provides passengers with various information. The passenger information system is a system that relies on multimedia network technology, with computer systems as the core, and stations and onboard display terminals as the medium to provide information services to passengers. Under normal circumstances, the passenger information system provides operational information such as boarding instructions, first and last train service times, train arrival times, train schedules, and manager announcements, as well as public media information such as government announcements, travel references, media news, live events, and advertisements. In emergency situations, based on the principle of prioritizing operational information, it can provide dynamic auxiliary prompts to guide passengers to safely and conveniently ride the rail transit through correct service information.  
PIS System Solution for Rail Transit Industry

2、 The network requirements require Ethernet switches to be connected in the network in the following two ways. When networking according to method one, Ethernet switches should be able to achieve data exchange between Ethernet devices connected to different Ethernet switches; When networking according to method two, Ethernet devices between two VLAN1 cannot achieve data exchange, while Ethernet data between VLAN2 can be exchanged.  
PIS System Solution for Rail Transit Industry

3、 We use customized board switches for the vehicle network design, with 5 M12 interfaces on the front panel, including 4 100Mbps M12 interfaces for adjacent car board devices and 1 as a device debugging port; The backplane has 7 ports and uses European 48 pin connectors to connect monitoring probes, broadcast speakers, LED playback screens, and other devices. The IREES2000 is a high-performance product with Bypass and POE functions. The Bypass function effectively prevents transmission interruptions caused by power outages or failures of devices in the vehicle cascade network; The whole machine needs to use industrial grade chips and dedicated interfaces, multi-layer board design, and complete interface protection to effectively ensure the reliability of the whole machine. It must comply with the safety standards for industrial information technology equipment and meet the relevant electromagnetic compatibility standards of EN50121. The whole machine adopts industrial switch chips and dedicated interfaces, multi-layer board design and complete interface protection to ensure the reliability of the whole machine.  

4、 Advantage 1 of the solution: IREES2000 is equipped with link aggregation function, which enhances the reliability of equipment and links, ensuring the reliability of communication across the entire network; 2. IREES2000 industrial switches use industrial grade chips, which not only ensure the transmission capacity of the switch, but also increase the stability of the switch during operation. 3. The harsh physical environmental conditions have strong adaptability, with operating temperature (-40 ℃ -85 ℃) and storage temperature (-40 ℃ -85 ℃). The power supply design has passed EMC Level 4 certification to ensure the stability of the equipment.. 5. Provides multiple management methods such as CLI, TELNET, WEB, and also supports Thick Stone NIS network management software, avoiding the complexity of device configuration.