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Redundant Wireless Roaming Maximizes a Brazilian Railway's ATO Network Availability
2012-12-27

Location / Country : Brazil

Product Solutions:

Introduction
Project Introduction

In advanced public transportation networks, Automatic Train Operation (ATO) is used to automatically drive and stop trains, open and close carriage doors, and reduce the time and distance required for acceleration and deceleration. Even in partially automated transit systems that elect to keep drivers aboard the trains for emergency situations, ATO can still be used in tandem with Automatic Train Control (ATC) protection systems so that moving trains can be spaced closer together than on a manually controlled line. By marginally adjusting station dwell times, the ratio of power to coast when moving, and other operating parameters, ATO and ATC effectively keep the trains in modern mass transit systems running on schedule. In ATO systems built by Moxa customers in Brazil, an off-site computer is used to monitor all trains running on the same track by communicating via radio signals with computers onboard the trains. In addition, ATO system segments at different stations may have different electrical configurations, and system components are installed outdoors.


System Requirements

• To safely automate the opening and closing of carriage doors, stable wireless transmissions are mandatory.

• Increase the efficiency and effectiveness of train service while allowing more stable communication with the railway control center.

• Since each rail platform is subject to different weather conditions and electrical circuitry configurations, the
equipment installed on the platforms must withstand outdoor environments and accommodate different electrical
requirements.


Moxa Solution

The onboard computer systems used in ATO must maintain continuous, reliable communication with the ATC protection system and remote control center for the entire rail network. Dual-RF wireless AP/bridge/client devices, such as the AWK-5222 and AWK-6222 series from Moxa, establish secure, reliable radio-based communications between the remote control center and onboard computers used to drive trains and open/close carriage doors for passengers at various stations.

In many Brazilian transit systems, wired Ethernet LANs are deployed to connect servers in the control center to all the station platforms on the rail network in order to transmit critical signals, data, and command protocols as part of the ATC protection system. To increase wireless reliability, AWK-5222 dual-RF client devices are installed in each train to transmit data over radio signals between onboard ATO computer systems and the platforms. Similarly, the AWK-6222 acts as an outdoor redundant wireless AP and provides radio-based wireless connectivity at each platform.

Moxa’s EDS-P308 unmanaged PoE Ethernet switches are then installed at each platform to power the AWK-6222 and supply additional Ethernet connections to the remote control center via the wired LAN. This setup enables the server at the control center to probe/scan clients and control automatic train operations, such as pilotless driving and opening/closing carriage doors. By establishing reliable transmissions between ATO computer systems, station platforms, and the remote control center, the AWK-5222 and AWK-6222 offer clear benefits for system integrators looking to establish solid radio-based communication links for Automatic Train Operations.


Why Moxa

• The AWK-5222 and AWK-6222 have a dual-RF module design and provide dual-band operations to allow simultaneous use of two distinct channels to protect against the disruptive interferences caused by radio.

• Compliance with IEEE 802.3af PoE standards allows the AWK series to be conveniently powered over Ethernet connections.

• The AWK-6222 is housed in an IP68 metal casing for total protection against dust, water, and other environmental effects. Moreover, weather-proof cases reduce expensive housing and fixture costs.

 

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See More Real World Applications

Moxa’s solutions are deployed in major railway systems across Europe, the US, and Asia, and can be found in passenger information systems (PIS), automatic train control (ATC), automatic train operations (ATO), automatic train supervision (ATS), and CCTV systems. For more information, please click on the icon to download the railway success stories.

 

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