1. Subway PIS system background, business introduction
1.1 Metro PIS System Overview Metro PIS system is based on multimedia network technology, computer system as the core, with the station and on-board display terminal as a medium to provide information services to passengers. Under normal circumstances, the passenger information system provides operational information such as travel instructions, first and last train service hours for rail transit, train arrival time, train schedules, and manager announcements, as well as government announcements, travel references, media news, live broadcasts of events, and advertisements. Public media and other information are used together in a coordinated manner. In emergency situations, based on the principle of prioritizing the use of operational information, dynamic assistance cues can be provided to enable passengers to use the correct service information guidance to safely and easily access rail transit.
1.2 Business Requirements The subway PIS system shall realize the function of uploading vehicle video surveillance information to the control center in real time and in real time.
Metro PIS system is divided into four levels according to control function: information source, center broadcast control layer, station and train broadcast control layer and station and train broadcast equipment; it can be divided into five subsystems from the structure: control center Systems, backup control center subsystems, station subsystems, vehicle subsystems, and network subsystems (wireline networks and vehicle floor radio subsystems).
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Picture 1-1
1.3 Network System Requirements
1.3.1 Network Composition The network subsystem consists of two parts: a wired network and a car wireless network.
The network subsystem uses the center-station backbone transmission network provided by the communication system to provide a network channel to the PIS. The channel is used to transmit various data information, video information, and control information between the center and each station and subway vehicle.
This program is mainly designed for the metro network PIS system wired network design. Functionally secure and stable connection channels.
The system utilizes the transmission network provided by the communication transmission system. Text image information is transmitted via IP. The interface type uses a 1000Mbps Ethernet interface.
Networks can be divided into logically independent networks through VLANs.
The main equipments of the network subsystem include: control center Ethernet switches, station/parking/carriage Ethernet switches, firewall equipment of the control center, and routers.
The switch installed on the control center Ethernet can connect to the Internet via firewall devices and routers.
1.3.2 Wired Network Subsystem Requirements The wired LAN provides video and data channels for the central station and wireless access points.
The network should adopt open architecture and industry standards. All network products support mainstream network and interface protocols.
The core switch is based on the design structure of the carrier-grade equipment. It uses a fully redundant route switching engine and a distributed power supply to ensure the reliability of the system. All modules are hot-swappable.
The data security of the network subsystem should be ensured, and the network should provide multiple modes and levels of access control security mechanisms. mainly include:
CLI user authentication and authorization through Radius;
Use SSH protocol to protect remote management sessions;
Filter and limit DdoS packets.
1.4 specific instructions
1.4.1 The network of the subway PIS system Concrete description The subway PIS system can be divided into five subsystems from the network structure: control center subsystem, standby control center subsystem, station subsystem, vehicle-mounted subsystem and network subsystem (wired network and Vehicle Radio Subsystem).
This part of the network design contains only the part of the wired network.
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Figure 2-10 Network planning of subway PIS system According to the on-site environment of the subway, the industrial Ethernet switch produced by TSC is specially selected. The specific instructions are as follows:
1.4.2 Control Center System Control Center The system network consists of two TSC Pt3606D three-tier core industrial Ethernet switches that form a redundant structure and are respectively connected to the communications network. The TSC Pt3606D can provide up to 96 Fast Ethernet ports or 68 Gigabit ports. According to the requirements, 24 ports are used to connect to the database server, historical database server, service center switch, network management server, front-end communication server, other application servers, and other terminal equipment. And for connection to control center and communication system networks.
The two TSC Pt3606Ds in the control center system adopt a star network structure and use redundant settings to provide two independent channels for communication between servers in the LC system and station-level equipment and terminal equipment. When any channel fails The communication between the server and the station-level equipment and the terminal equipment can be performed through another way, and will not have any influence on the normal communication of the network.
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Figure 2-11 Connection diagram of the control system of the subway PIS system
1.4.3 Station Subsystem The station subsystem is an important part of the subway PIS system. It mainly realizes the connection of wireless AP equipment inside the station and realizes the interconnection with the control center at the same time, so as to realize the reliable transmission of the PIS system data of the control center and the station part.
This solution uses a three-layer routing switch TSC Pt3552D (48 100M Ethernet interfaces and 4 Gigabit optical ports optional) for each station to provide access services for the station subsystem.
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Figure 2-12 Typical station system of subway PIS system
1.4.4 On-board system On this subway on-board system, several TSC Carat 2024D-A components are used. By arranging several industrial switches on the on-board system, the interconnection of the on-board internal system and the station exchange equipment can be realized.
TSC Carat2024D-A series of industrial managed Ethernet switches supports 24 10/100Base-TX ports. Two expansion slots can be used to expand two single-port 100M or Gigabit modules. They use a store-and-forward switch mode to provide full-duplex operation. IEEE802.3x flow control and back pressure flow control in half-duplex mode support port auto-negotiation and automatic learning of network structure.
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1.1 Metro PIS System Overview Metro PIS system is based on multimedia network technology, computer system as the core, with the station and on-board display terminal as a medium to provide information services to passengers. Under normal circumstances, the passenger information system provides operational information such as travel instructions, first and last train service hours for rail transit, train arrival time, train schedules, and manager announcements, as well as government announcements, travel references, media news, live broadcasts of events, and advertisements. Public media and other information are used together in a coordinated manner. In emergency situations, based on the principle of prioritizing the use of operational information, dynamic assistance cues can be provided to enable passengers to use the correct service information guidance to safely and easily access rail transit.
1.2 Business Requirements The subway PIS system shall realize the function of uploading vehicle video surveillance information to the control center in real time and in real time.
Metro PIS system is divided into four levels according to control function: information source, center broadcast control layer, station and train broadcast control layer and station and train broadcast equipment; it can be divided into five subsystems from the structure: control center Systems, backup control center subsystems, station subsystems, vehicle subsystems, and network subsystems (wireline networks and vehicle floor radio subsystems).
Picture 1-1
1.3 Network System Requirements
1.3.1 Network Composition The network subsystem consists of two parts: a wired network and a car wireless network.
The network subsystem uses the center-station backbone transmission network provided by the communication system to provide a network channel to the PIS. The channel is used to transmit various data information, video information, and control information between the center and each station and subway vehicle.
This program is mainly designed for the metro network PIS system wired network design. Functionally secure and stable connection channels.
The system utilizes the transmission network provided by the communication transmission system. Text image information is transmitted via IP. The interface type uses a 1000Mbps Ethernet interface.
Networks can be divided into logically independent networks through VLANs.
The main equipments of the network subsystem include: control center Ethernet switches, station/parking/carriage Ethernet switches, firewall equipment of the control center, and routers.
The switch installed on the control center Ethernet can connect to the Internet via firewall devices and routers.
1.3.2 Wired Network Subsystem Requirements The wired LAN provides video and data channels for the central station and wireless access points.
The network should adopt open architecture and industry standards. All network products support mainstream network and interface protocols.
The core switch is based on the design structure of the carrier-grade equipment. It uses a fully redundant route switching engine and a distributed power supply to ensure the reliability of the system. All modules are hot-swappable.
The data security of the network subsystem should be ensured, and the network should provide multiple modes and levels of access control security mechanisms. mainly include:
CLI user authentication and authorization through Radius;
Use SSH protocol to protect remote management sessions;
Filter and limit DdoS packets.
1.4 specific instructions
1.4.1 The network of the subway PIS system Concrete description The subway PIS system can be divided into five subsystems from the network structure: control center subsystem, standby control center subsystem, station subsystem, vehicle-mounted subsystem and network subsystem (wired network and Vehicle Radio Subsystem).
This part of the network design contains only the part of the wired network.
Figure 2-10 Network planning of subway PIS system According to the on-site environment of the subway, the industrial Ethernet switch produced by TSC is specially selected. The specific instructions are as follows:
1.4.2 Control Center System Control Center The system network consists of two TSC Pt3606D three-tier core industrial Ethernet switches that form a redundant structure and are respectively connected to the communications network. The TSC Pt3606D can provide up to 96 Fast Ethernet ports or 68 Gigabit ports. According to the requirements, 24 ports are used to connect to the database server, historical database server, service center switch, network management server, front-end communication server, other application servers, and other terminal equipment. And for connection to control center and communication system networks.
The two TSC Pt3606Ds in the control center system adopt a star network structure and use redundant settings to provide two independent channels for communication between servers in the LC system and station-level equipment and terminal equipment. When any channel fails The communication between the server and the station-level equipment and the terminal equipment can be performed through another way, and will not have any influence on the normal communication of the network.
Figure 2-11 Connection diagram of the control system of the subway PIS system
1.4.3 Station Subsystem The station subsystem is an important part of the subway PIS system. It mainly realizes the connection of wireless AP equipment inside the station and realizes the interconnection with the control center at the same time, so as to realize the reliable transmission of the PIS system data of the control center and the station part.
This solution uses a three-layer routing switch TSC Pt3552D (48 100M Ethernet interfaces and 4 Gigabit optical ports optional) for each station to provide access services for the station subsystem.
Figure 2-12 Typical station system of subway PIS system
1.4.4 On-board system On this subway on-board system, several TSC Carat 2024D-A components are used. By arranging several industrial switches on the on-board system, the interconnection of the on-board internal system and the station exchange equipment can be realized.
TSC Carat2024D-A series of industrial managed Ethernet switches supports 24 10/100Base-TX ports. Two expansion slots can be used to expand two single-port 100M or Gigabit modules. They use a store-and-forward switch mode to provide full-duplex operation. IEEE802.3x flow control and back pressure flow control in half-duplex mode support port auto-negotiation and automatic learning of network structure.