Posts Tagged ‘Transportation’

Customer Solution: Power over Ethernet (PoE) for Intersection Monitoring

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Power over Ethernet for Intersection Monitoring

Improving traffic flow is a growing priority for expanding cities and towns, and one of the most efficient ways to reduce accidents and heighten safety is the use of intersection monitoring through video recording.  Not only is the video used to determine ways to decrease traffic congestion – it can also be reviewed for accident footage, fault resolution, and to assure that traffic systems are working correctly.

Power over Ethernet Intersection MonitoringA large city in the state of Iowa is improving its intersection monitoring system.  A total of seventy intersections with approximately two hundred cameras are currently deployed around the city, constantly recording traffic activity.  Along with cameras, other equipment is installed at the intersections such as preemption devices, conflict monitors, battery backup devices and other various sensors.  Preemption systems detect emergency vehicles and adjust traffic signals to allow high-priority vehicles to drive safely through the intersections.  Additional sensor data is recorded at the intersections such as car counting, lane changing, and speed of traffic.

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Traffic Intersection Networking – Customer Application

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Traffic Intersection Networking

Recently a southwestern U.S. city with a fiber network needed to reliably network and remotely manage 120 traffic intersections from the city’s traffic management center.  Before choosing a managed Ethernet switch to implement into their system, the city had to take into consideration a number of other requirements that needed to be met.

Traffic Intersection MonitoringA gigabit fiber backbone was required due to the bandwidth needed for streaming live video.  Video streaming, signal controllers, conflict monitors, preemption detectors, and all other Ethernet connected devices needed to have 100% uptime.  The city also needed an Ethernet switch that was flexible and had the ability to support single-mode and multi-mode fiber due to the different communication mediums between the intersections.  Finally, due to the extreme temperature environments within a traffic cabinet, the managed Ethernet switch they chose had to be NEMA TS2 compliant, supporting a -40° to 74° C temperature range.  With all of these requirements in place, the city searched for a managed Layer 2 field Ethernet switch that would meet the certification requirements requested and would provide multiple fiber uplink ports.

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Tunnel Traffic Monitoring System – Nevada DOT

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RocketLinx ES8510-XT

During this expansion project, the Nevada DOT chose Comtrol’s RocketLinx® ES8510-XT switch to enable data transmission from their traffic cameras to server room monitoring stations, eventually showing up on live feeds at the DOT monitoring station.

The Nevada Department of Transportation (DOT) needed to expand their traffic monitoring system along Interstate 80, about 250 miles northeast of Reno.

One of the monitoring systems involved installing two traffic cameras to monitor the traffic flow going both east and west through the Carlin Tunnel, just West of Elko, NV.  Both cameras are connected to one RocketLinx ES8510-XT industrial Ethernet switch, which directs information wirelessly through a point-to-point wireless link to another RocketLinx ES8510-XT switch installed on a nearby mountain.  The data is then routed down to Elko’s server room.  Additional information from switch-camera installations of similar configurations near Elko is also routed to the server room, which sends all of the information to the DOT control center in Reno.Carlin Tunnel Nevada DOT - RocketLinx ES8510-XT

The Nevada DOT decided to implement Comtrol’s switches into their system as a cost-effective, easily-configurable solution for their needs.  The RocketLinx ES8510-XT was chosen over the competition for the addition of an extra fiber port as well as for its maneuverability within the DOT’s system structures.  The switch is also NEMA TS2 compliant, allowing for reliable operation in extreme temperatures ranging from -40° to +74°C.

The RocketLinx ES8510-XT is housed in a rugged aluminum enclosure that features an excellent heat dispersing mechanical design.  The embedded software supports full Layer 2 management features, multi-form ring redundancy, network control, monitoring, security and notification.  The RocketLinx ES8510-XT also provides a built-in watchdog timer and digital input and relay output to avoid undetected problems, providing the perfect foundation for building an industrial Ethernet infrastructure.

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Comtrol’s DeviceMaster® and RocketLinx® products are NEMA TS2 certified at no additional cost

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The NEMA TS2 standard was established by the National Electrical Manufacturers Association (NEMA) to define safe traffic control equipment. Section 2 contains the environmental and testing requirements, including guidelines for temperature (-34° to 74°C), humidity, vibration and shock.

RocketLinx DeviceMaster NEMA TS2 Certification

Independent lab testing verified Comtrol’s DeviceMaster serial device servers’ and RocketLinx industrial Ethernet switches’ performance when subjected to the extreme temperatures, operating voltage and humidity fluctuation, vibration and shock commonly experienced in severe outdoor environments.

“We know how important NEMA certification is to our traffic and transportation customers,” Comtrol’s President, Bradford Beale, said about the National Electrical Manufacturers Association standard, “To show our dedication to these customers and others that require extended temperatures from -34° to 74° degrees Celsius, our standard 1, 2, 4 and 8 port DeviceMaster RTS and PRO products are compliant at no additional cost to our traffic management customers.”

        RocketLinx industrial ethernet switch familyDeviceMaster device server family

These field-hardened device servers provide connectivity for a broad range of traffic and transportation applications currently used by more than 300 traffic and transportation agencies nationwide. Select models of Comtrol’s RocketLinx industrial Ethernet switches are also NEMA TS2 certified. Our customers use DeviceMaster device servers and RocketLinx switches to control and manage intelligent transportation systems (ITS) including traffic management systems, arterial and freeway management, roadside cabinet networking, and intersection management and control. Reliable and easy-to-install, DeviceMaster devicare also cost effective solutions for open road tolling (ORT), electronic toll collection (ETC), toll plazas, and parking automation environments.

“Ensuring that our products are field hardened—especially for harsh temperatures— has been a critical design objective for some time,” said Beale, “In fact, while NEMA certification requires that systems withstand temperatures of -34° C, we designed DeviceMaster and RocketLinx products to withstand -37° C, and in some cases 85° C.”

View Comtrol’s NEMA TS2 certified DeviceMaster and RocketLinx products


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