Managed Switches for greater safety and availability
in the Cholfirst tunnel

Overview

Cholfirst tunnel  

Traffic control in the Cholfirst Tunnel in Schaffhausen, Switzerland

  • The operating and safety equipment in the Swiss Cholfirst tunnel, commissioned in 1996, had to be modernized because some of it no longer met the current requirements.
  • Ethernet-based communication was also installed at the field and control level as part of the modernization of the control engineering system.
  • The system integrator entrusted with this project selected Managed Switches from the FL SWITCH 22xx series as the infrastructure components, because the devices are easy to handle.
  • Since it is difficult to access the switches installed in the tunnel entrance zones and the open stretches, the devices can be configured and diagnosed from the engineering room using the Network Manager tool.

Customer profile

Service vehicle owned by Ticos, the system integrator  

Ticos specializes in tunnel and traffic control systems

The system integrator, Ticos Engineering & Software AG, specializes in tunnel and traffic control systems. The operating and safety equipment installed in the tunnels normally ensures that the traffic flows smoothly. But if there is a fire or accident, these technical systems can also save lives.

Application

Control cabinet with switches  

The control boxes installed in the tunnel entrance zone are difficult to access

The section of the Swiss A4 highway between Schaffhausen-Nord and Flurlingen includes several tunnels. It has been in operation since 1996, meaning that some of the technology installed at that time no longer meets the current requirements. Therefore, the Swiss Federal Roads Office (FEDRO) initiated a refurbishment program to increase tunnel safety. Ticos was awarded the contract for the conversion as well as the modernization of the operating and safety systems, including those in the 1,260 meter, three-lane Cholfirst tunnel.

To ensure that the work had as little impact on traffic flow as possible, the control engineering system was modernized in stages during ongoing operations. The system controller and several local PLCs were replaced. The allocated control cabinets are located in the engineering rooms or sub-distribution centers of the two tunnel portals. The lane signals are connected to the traffic control engineering system here. The Ticos employees switched the signals from the old controller to the new controller. Additionally, an Ethernet-based communication system was also installed at the field and control level.

Solution

A redundant Ethernet ring based on single-mode fiberglass technology was installed to cover the large distances involved and to ensure high availability. Ticos selected Managed Switches from the FL SWITCH 22xx series as the infrastructure components. The main reason was the easy handling of the devices, which can be set up in a redundant ring topology without further configuration. Since the control network had to be set up quickly, it was advantageous that no further time-consuming configuration work was necessary.

The switches have two single-mode fiberglass interfaces with SC Duplex connectors, as well as six twisted pair copper interfaces with RJ45 connectors. The single mode ports are connected to the fiberglass installation through fiber-optic cable patch fields. The fiberglass cables run between the tunnel portals in the service duct below the carriageway. There, the switches are mounted in the transverse control boxes and are coupled to the fiberglass ring. The main and local controllers installed in the substations are connected to the switches through RJ45 ports. The components are installed in the tunnel portal engineering rooms. Switches with single mode uplinks are expanded in the substations with versions that have eight twisted pair ports so that further communication devices can be integrated into the network.

2200-series switch  

The control technology installed in the substation is connected to the fiberglass ring through the switch

While the switches installed in the engineering rooms can be accessed easily, the devices installed in the service duct that stretch for kilometers can only be reached after a long walk. Accessing the switches – through which, for example, the rerouting signals are controlled – installed on the masts and gantries in the entrance zones and in the open stretches also involves considerable effort. For this reason, the Ticos employees can assign an IP address over the network using the central Network Manager startup tool. Should further settings be necessary, they can also be configured with the software. Employees can thus configure all of the installed switches and perform diagnostics from the engineering room.

Summary

To date, Ticos has only had positive experiences with the FL SWITCH 22xx switches. “We particularly like the simple handling of the components,” says Armin Spiess, Senior Director at Ticos. “Therefore, we are also going to expand this networking concept to other tunnel sections, as well as any potential follow-up projects once approved by the construction company.” There is therefore nothing standing in the way of free-flowing traffic on the A4 around Schaffhausen and the Swiss-German border.

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