Advanced Traveler Information System for Highways
Taiwan is one of the most densely populated islands in the world, with over 660 people for every square kilometer. Two-thirds of the island consists of rugged forested mountains which crowd 90 percent of the island’s 23 million inhabitants onto the western coast. Taiwan’s road network is no stranger to landslides, road closures, and severe traffic congestion. Local transportation officials clearly need a way to broadcast timely warnings to motorists. Advanced Traveler Information Systems (ATIS) that incorporate a network of variable LED message boards, or changeable message signs (CMS), can broadcast real-time information—such as severe weather conditions, traffic jams, car accidents, and other warning messages—to hundreds of drivers at once. Sophisticated networks such as these have not only alleviated traffic congestion in southern Taiwan, but also improved public safety as well.
• Integrate existing serial/Ethernet CMS devices.
• Allow private IP accessibility over the Internet for centralized management and control.
The most convenient way to reliably transmit important messages from a traffic control center to message boards along a vast freeway network in an ATIS is to use cellular technology. Unfortunately, most changeable message signs used in ATIS applications are not equipped to handle cellular communication. As it would be cost-prohibitive to customize cellularenabled CMS boards for an entire ATIS, a transportation department in southern Taiwan turned to Moxa’s OnCell G3110 GSM/GPRS/EDGE IP gateway—which supports both Ethernet and RS-232 serial communication—as a reliable yet cost-effective way to transform legacy CMS message boards into mobile devices.
Another obstacle is that most Internet service providers only offer private IP addresses to mobile devices due to the limited availability of public addresses. Mobile devices configured with a private IP address can access resources on the Internet, but cannot be managed or accessed directly from the Internet since the private IP address is hidden. Moxa’s OnCell G3110 IP gateway not only overcomes this problem, but accommodates both Ethernet and serial CMS devices and remote hosts. Once a connection is established, the CMS and remote host can communicate with each other over the pre-established link.
OnCell Central Manager software, which can be installed by a customer or hosted by Moxa, also allows network administrators to access their message signs from anywhere across an IP network, including the Internet, for centralized network management and easy administration to broadcast real-time warning messages to drivers conveniently over cellular networks.
• OnCell G3110 provided IP-based connectivity via cellular networks for both serial and Ethernet-based CMS.
• Cost-effective TCP/IP communication provided with management capabilities over a secure and reliable cellular network.
• The OnCell Central Manager allows for a convenient way to access remote CMS boards with private IPs from the remote control center that has a public IP.
See More Real World Applications
Moxa’s comprehensive line of WLAN and cellular solutions have been successfully implemented in various mission-critical industrial applications, including transportation, factory automation, smart grid, and heavy industry. For more information, please click on the icon to download the Industrial WLAN success stories.