Reliable communication for Besançon’s all different tram
“Moxa provided a full solution to meet every aspect of the project requirements, and not just with highly durable products but also with a customer-oriented service attitude,” says Pascal Gudefin, Project Director of Besançon’s tramway.  
Project Background

Grand Besançon’s, an agglomeration of 59 communities, including their regional capitalBesançon, is situated in the East of France and has roughly 180,000 inhabitants. In 2003, the communities decided to upgrade the existing system of urban buses, which was quickly becoming inadequate. After careful analysis of the traffic situation and the capacity needed, the community concluded that an extension of the bus network would not be sufficient, and that a modern tramway system was the best option to ensure sustainable transportation development.

Compared with a network of urban buses, the costs for a modern tramway system is much higher. Average cost per kilometer of tram line is between 20 and 30 million Euros. However, Besançon was determined to construct a 14.5-kilometer tram network consisting of 31 stations, at a cost of approximately €17 million per kilometer, or a total of €228 million for the complete system.

To successfully deploy a tram network within the allotted budget, tramway planners needed cost-effective solutions for the wayside communication infrastructure, onboard communication for video surveillance and PIS (passenger information systems), and wireless communication between the trams and the depot.

The wayside infrastructure

The wayside infrastructure was built as a multi-service Ethernet network using Moxa’s EDS-P510 managed industrial Gigabit Ethernet switches, each with 7 Ethernet ports, 3 Gigabit Ethernet ports, and equipped with SFP connectors. Two of the Gigabit ports on the EDS-P510 are connected to the Gigabit Turbo Ring system to ensure reliability and availability of the network backbone, leaving a spare Gigabit port for uplink use. PoE (Power over Ethernet) ports offer a convenient way to connect peripheral devices, such as cameras, without additional need for power cables.

The tram stations

Every tram station has two kiosks, each with two displays mounted on top of the kiosk to provide passenger information, speakers to broadcast announcements, and video cameras to enhance tramway security. Inside the kiosks, Moxa’s V2402-LX embedded computers control LCD/LED displays, audio equipment, tramway ticket processing, and video recording. The computer connects to the wayside Gigabit fiber ring through the EDS-P510 Ethernet switch via the fast Ethernet port. Moxa’s ioLogik RS-485 remote I/O controllers, with 12 digital inputs and 8 digital outputs, control the back-up batteries, audio amplifiers, lightning arresters, and intrusion-detection sensors.

The onboard system

Aboard the trams, Moxa’s TN-5308-4PoE unmanaged EN 50155-compliant Ethernet switches ensure reliable operation and protect against high vibration and shock with M12 connectors. These switches are connected to Moxa’s V2426 EN 50155-compliant embedded railway computers, which control the displays and speakers mounted onboard the trams as part of the passenger information system.

To ensure reliable data storage, the V2426 computers are equipped with Moxa’s FK-75125-02 anti-vibration storage drives package, which enables the installation of commercial hard-disks, such as the Toshiba 500Go, to provide comprehensive storage space for large amounts of video and audio data. As the tram vehicles enter the depot, the EPM-3337 expansion module of the V2426-LX embedded computer provides wireless communication with the AWK-3121 wireless access point via a WiFi connection.

To provide easy systems maintenance, the exchange of information between the trams and the depot is handled by wireless communication. Moxa’s V2426-LX railway computers with peripheral expansion slots are equipped with Moxa’s EPM-3337 WiFi/GPRS/GPS-modules. When entering the depot, the computers connect to 4 of Moxa´s AWK-3121 wireless access points for seamless connections and 100 ms Turbo Roaming via Moxa’s ANT-WSB-ANF-9 omni-directional 2.4 GHZ antennas. The AWK-3121 is compliant with the essential sections of EN 50155 and EN 50121, ensuring reliable operation in railway environments.

Why Moxa

Besançon needed a cost-effective and reliable total communication solution for the new tram network. Moxa was capable of providing a comprehensive communication system with industrial-grade durability, rail-approved certifications, value-added features, pricing to meet a limited budget, and a customer-oriented approach to support all phases of the tram project.

Moxa products
7+3G-port Gigabit PoE managed Ethernet switch

EN50155 certified x86 ready-to-run embedded computer
EN50155 certified 8-port IEEE 802.3af PoE unmanaged Ethernet switch
EN50155 certified industrial IEEE 802.11a/b/g Wireless AP/Bridge/Client
ioLogik R 2110
RS-485 remote I/O controller
EN50155 certified x86 ready-to-run embedded computer

Moxa, with more than 25 years of experience in industrial networking, provides industrial edge-to-core solutions for many ITS applications.

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