Geplaatst op: 02 september 2019 in
“We worked closely with Axians, our supplier of network services, and Modelec Data Industrie, the distributor of Westermo products in the Netherlands. The collaboration between the three parties was essential to the success of the project. Modelec Data Industrie are very knowledgeable about industrial data communications and during constructive discussions regarding the system requirements they suggested that Westermo technologies would be a good choice for building a robust and reliable network for the future.
“From our meetings a roadmap was established. Our long-term plan is largely based on having a fibre optic infrastructure managed by Westermo Lynx and RedFox Ethernet switches. However, installing new cables is a costly and time-consuming process, so where existing fibre optic cabling is not already available, we have found the Westermo Wolverine Ethernet Extender to be extremely useful. This device allows us to create reliable, high speed, fully managed network solutions using the existing copper cables linking the traffic light systems. For remote connections, between the edge networks and the control centre, we have used Westermo MRD 4G cellular routers, which offer a redundant SIM option and simplifies the process of setting up IPSEC VPN’s.
Before a large-scale implementation of the new system could begin, the Lynx switches and Wolverine Ethernet Extenders were tested at some of the less critical road junctions. To assess the Westermo MRD 4G cellular routers, a mobile test system was constructed and taken to popular parts of Amsterdam during King’s day, the annual Dutch national holiday and busiest day of the year. Despite the huge crowds swamping the mobile masts, the routers delivered excellent performance.
Having met our required standards during testing, the Westermo devices were deployed extensively throughout the city and are now providing the data communications for several major traffic control systems. Hundreds of Westermo devices are currently connected via the new network and with the traffic control systems being constantly upgraded this figure continues to grow.”
“Westermo offers a broad range of products suitable for traffic control applications, which has helped us to meet all of our needs for this project. We have found the technology to be robust and reliable. The devices consume very low power, which means they generate little heat. This is important, as the switches are often installed in cramped, unventilated cabinets with other electronics that can be damaged if they get too hot.
“The Westermo Lynx switch is very versatile, offering an array of smart features and network connections. For example, the SFP option gave us the ability to easily switch between copper and fiber wiring, while the serial port enabled connection to legacy traffic light systems. The option to perform text-based configuration from a console port has supported our need for fine granular control and rapid mass deployment of devices. Every device received a consistent configuration, but we had the flexibility to adjust the configuration of specific devices, where required. This functionality has enabled us to install all the devices in a little over 12 months. This helped us to make significant savings because the costly leased lines to the datacenter could be terminated sooner.
However, because it is difficult, time consuming and costly to install and maintain a data network of this size within a city such as Amsterdam, we knew the new network would eventually have to be able to support more than just the traffic light systems. In fact, it must support camera surveillance, traffic information systems, automatic number plate recognition camera and even public lighting systems. Critically, these other applications must be isolated from each other for security purposes, while changes or additions to the network must also be simple to achieve.
“Efficient use of the cable infrastructure is therefore critical, which is why we selected switches with layer 3 functionality at the start of the project. This enabled us to create a layer-3 network design. A clever combination of OSPF routing, local firewalling and layer-2 and layer-3 features has yielded a very flexible, secure and redundant gateway network design. The network is now sufficiently resilient to withstand common issues, such as cable damage and power outages.
“Using the Westermo Redfox switches, we will soon couple our updated network to the fiber optic rings used to control the city’s metro lines. This will provide fully redundant gigabit connections to our datacenter for many of our surveillance cameras and traffic systems.
“Using Westermo technology we have built a robust and reliable networking solution that will last for a long time. The technology offers the functionality we need to modernise the network and enable us to make quick system upgrades over the lifecycle of the system,” Bish added. “As far as we are aware, this is the most advanced network infrastructure in place in The Netherlands and to date the solution has performed flawlessly. We expect that within five years the industrial network will cover the whole of Amsterdam and its surrounding areas and this will almost completely rely on gigabit fiber links, with only a handful 4G connections still required.
Use case 1: Traffic light control