Wireless Redundancy and 100 ms Turbo Roaming IEEE 802.11a/b/g dual-RF AP/Bridge/Client

Application

Real-time Status Updates for Mass Rapid Transit Systems

Background

Security is an important issue in mass rapid transit systems due to the high volume of passenger traffic. In the past, the status of trains, platform gates, alarm systems, and environmental controls were recorded manually at the stations. However, train operators and security personnel need real-time information to handle emergencies. With wireless technology, security can be improved by transferring this information as trains approach the station. Also, personnel at the station can transfer information to arriving and departing trains, including the status of other trains, track conditions, and other information.

Application Requirements

	Real-time information updates and transmission between trains and stations

	Reliability and redundancy to ensure seamless network connectivity

Benefits

	Redundant dual-RF design for rapid failover

	Reliability and redundancy to ensure seamless network connectivity

Solution Description

An AWK-5222 set to Redundant Client mode is installed in the train, and a Redundant AP is installed at the station. When the train approaches the station, the Redundant Client in the train establishes a connection with the station and starts sending information and downloading information from the information center. In order to provide good communication performance, the Redundant Client with dual RF sets up two independent wireless connections with the Redundant AP devices. If either of the two wireless connections fails, the other wireless connection will continue transmitting packets. Redundancy is important because the train only stays at the station for 1 to 2 seconds. Using a dual RF connection is better for this kind of application, since it helps to ensure that data is transmitted completely between the train and information center.

System Diagram

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