Intelligent Transportation System
Background
The introduction of rail transportation in the 19th century launched an unprecedented era of growth and prosperity. More than a hundred years later, rail traffic continues to be an important mode of transportation. In order to maintain real-time traffic management, modern transit systems are deploying more and more equipment such as TIS, PLC, Traffic Controllers, AFC, and IP phones and cameras. Within the largely scaled transportation field, many devices and control level products have turned to TCP/IP networks as the main transmission media for equipment data and signals to take advantage of the lower installation costs and enhanced system centralization capability.
 
Application Requirements
Authorities rely heavily on intelligent transportation systems (ITS) for centralized management of all the traffic controls that span from station to station. In particular, they need the entire network to be highly integrated, always available, and redundant. The rackmount Ethernet switches of the control centers and the DIN-Railed switches used throughout the operation field site should endure harsh environments, and together form an integrated and reliable network. The following are commonly used devices for ITS, which are compatible with Moxa industrial Ethernet switches.
 
  A TIS (Transportation Information System) can be controlled through a touch screen user interface in the control center. The TIS may have following functions: destination and vehicle number display, and schedule display and public information display.  
  PLCs are well-adapted to a range of automation tasks. In rail transportation system, the PLC is designed for multiple inputs and outputs, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact.  
  Traffic controllers are responsible for the effective and secure operation of a railway within an assigned operating territory. They ensure railway capacity is maximized by applying effective planning, scheduling and queuing techniques.  
  AFC (Automatic Fare Collection) is a revenue collection system that requires the passenger to purchase a ticket and use it to permit access to or from the rapid transit system. AFC reduces the demand for ticket checking staff and helps prevent fraud in the ITS.  
  IP surveillance monitoring requires the simultaneous transmission of video, voice, and data over a single network, which means that using bandwidth efficiently is particularly important if surveillance systems are to achieve real-time monitoring in ITS.  
   
 
Network Solutions

With the large volume of data, video, and voice that must be transmitted, light railway networks require ample bandwidth to ensure real-time monitoring and response. Because of the high bandwidth and anti-vibration requirements, many ITSs employ Gigabit fiber optic networks and use specialized industrial rackmount switches.

This system's backbone relies on Moxa's IKS-6526 24+2G-port rackmount Ethernet switch and employs a fiber-optic Gigabit Turbo Ring™ topology. Fiber-optic communication is the best choice due to long distance and high bandwidth requirements, and the Turbo Ring™ topology provides media redundancy with a network recovery of less than 20 ms.

As shown in the following diagram, rackmount Ethernet switches are spread out from the control center network to the stations for traffic control and monitoring. Each node uses an EDS-619 16+3G-port DIN-Rail managed Ethernet switch within the various sub-systems for connection with facility monitoring, traffic control, AFC, TIS, PLC, and data acquisition devices. Thanks to its compact size, modular design with copper/fiber configurations, and multiple fiber capability, the EDS-619 is perfectly suited for the flexible, high-density connections that ITS systems require. All devices in the transportation system are accessible for monitoring and control over a reliable Ethernet network. With the exception of the power supply system, all of the sub-systems are linked via the network infrastructure to provide seamless communications.
 
 
Benefits from Moxa
 
  One-stop shopping with a vast range of rack and DIN-Rail mountable industrial Ethernet switches
  Turbo Ring™ and Turbo Chain™ (recovery time < 20 ms), and RSTP/STP self-healing Ethernet redundancy for building fast redundant network—from the control center to the industrial field site
  Isolated redundant power inputs to avoid single power failures
  Gigabit SFP fiber ports for higher bandwidth and long distance connectivity
  Industrial certifications such as UL60950, NEMA TS2, and EN50121-4
 
Key Products
IKS-6526 Series
24+2G-port Rackmount Managed Ethernet Switches
Turbo Ring™ and Turbo Chain™, and RSTP/STP for Ethernet Redundancy (Recovery Time < 20 ms)
Isolated redundant power inputs with 110/220 VAC power supplies
Gigabit SFP fiber ports for higher bandwidth and long distance connectivity
Rugged design with UL60950 certification that is free from electromagnetic interference
-40 to 75°C operating temperature range
 
EDS-619 Series
16+3G-port Compact Modular Managed Ethernet Switches
Compact and space-efficient design
Up to 19 optical fiber connections for long-haul transmission
Turbo Ring™ and Turbo Chain™, and RSTP/STP for Ethernet Redundancy (Recovery Time < 20 ms)
-40 to 75°C operating temperature range
QoS, IGMP snooping/GMRP, VLAN, LACP, SNMPv1/v2c/v3, RMON, and security features supported
 
 
 
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