Intelligent Transportation System Over Fiber Gigabit Ethernet

The third-largest US state-owned highway built a centralized traffic control and monitoring network to give operators access to real-time traffic information

Introduction

The third largest state-owned highway system in the United States is maintained by the state DOT (Department of Transportation). The state DOT planned to centralize traffic control/monitoring of highways (including roads, bridges, and tunnels) across the state’s five central TMCs (traffic management center). These TMCs serve as hubs for regional emergency response and incident management operations of traffic-related events. TMC operators will have access to real-time traffic information from DOT personnel, state police, emergency response agencies, cameras, sensors, and other tools to ensure traveler safety by notifying drivers of traffic conditions and emergency events via VMS (variable message sign) broadcasts and other public media. “Our role is to facilitate the safe and efficient travel of drivers… By coordinating fast, effective incident response and communicating traffic information to the public in a timely manner from our Traffic Management Centers, we can provide the best possible driving experience for our customer.” said the DOT Commisioner.

System Requirements

Gigabit network backbone for large volumes of video data
NEMA TS2 compliance for network components
Network redundancy with secure data encryption capability
Network traffic management for bandwidth efficiency
Industrial durability to withstand severe outdoor conditions
Fiber interface for long distance transmission with high scalability

Moxa Solution

Moxa’s EDS-510A-T industrial Ethernet switches (equipped with Moxa SFP-1G gigabit Ethernet SFP modules) were selected to assemble regional gigabit Ethernet backbones over fiber for each TMC with transmissions of up to 120 km. The EDS-510A-T managed switches were configured with IGMP snooping to optimize bandwidth usage and reduce network congestion. Each EDS-510A-T provides secure connections with TACACS+, SNMPv3, IEEE802.1x, HTTPS, and SSH to deny unauthorized network access, features Turbo Ring™ technology to provide network redundancy with recovery times in under 50 ms (at 250-switch load), and supports topology options, such as Ring Coupling, to provide a backup path and ensure uninterrupted connectivity when link failure occurs.

The NPort 6450-T terminal servers feature Moxa’s Real COM mode, which allows secure remote operation, and provide Ethernet connectivity to existing serial devices such as vehicle loop sensors, and VMS (variable message sign) equipment. In addition, the widetemperature tolerance (-40 to 75°C) of the EDS-510A-T switches and NPort 6450-T terminal servers enable them to perform reliably without air conditioning in severe highway operating conditions.

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Why Moxa

The EDS-510A-T provides two Gigabit Ethernet ports for redundant ring and one Gigabit Ethernet port for uplink solution to support massive video and data transmissions
The EDS-510A-T features Turbo Ring technology to minimize network downtime (recovery time < 50 ms @ 250 switches)
The EDS-510A-T supports IGMP snooping and tagged VLAN for more efficient bandwidth usage
The EDS-510A-T provides SFP slots for up to120 km of data transmission
The EDS-510A-T is NEMA TS2 certified and passes antivibration standards to offer robust performance.
The NPort 6450-T provides secure connections for existing serial devices via Real COM and TCP Server/Client modes
The NPort 6450-T provides port buffers for storing serial data when the Ethernet connection fails
All Moxa products are available in wide-temperature (-40 to 75°C) models to provide the durability required for highway applications