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Optical fiber cables 
To serve complex signalling and telecommunications for train control, Nexans has developed WANs (trunk line), MANs and LANs based on optical fiber, and is also an expert in GSM-R technology. To meet the security concerns of tunnels and urban metro systems, Nexans produces both metal-armored and all-dielectric optical fiber cables, offering electromagnetic immunity.
Lisbon’s inter-modal Gare do Oriente uses a Nexans LAN to manage 8 railway lines, a subway and surface mass transit. An all-dielectric cable containing 216 fibers was qualified for the London underground. Compact and cost-efficient optical fiber micro-cables are increasingly being installed in dense subway networks.
Product leaflet : Trunk line and radio system optical fiber
Station range cables 
For the final mile, especially in city transport systems, Nexans offers both copper and hybrid copper/optical fiber cables for xDSL transmission, which can be incorporated in a LAN or access network.
Nexans provided special jointing sleeves for the optical fiber links of Deutsche Bahn AG for a part of the Cologne-Brussels line. This advanced technology is used for both single circuit and single fiber management
Fiber access routing technology 
Nexans’ splicing modules and jointing sleeves optimize fiber routing, thus guaranteeing network integrity. They are easily implemented as an end-to-end solution in distribution frames, splicing closures and access points.
Nexans provided special jointing sleeves for the optical fiber links of Deutsche Bahn AG for a part of the Cologne-Brussels line. This advanced technology is used for both single circuit and single fiber management
Product leaflet : Fiber access routing components
ODFs and closures 
Our modular Optical Distribution Frames provide a complete architecture for main exchange nodes or point-of-presence applications. Splice protection closures are used along the line or at access points to the local loop.
Splicing closures come in a range of splice protection boxes, and can be installed in manholes underground or fixed to poles for aerial cables.
Radiating cables 
These flexible perforated coaxial cables act like antennas in twisting or confined environments, like tunnels, where conventional antennas cannot operate. They are extremely important for ERTMS/ETCS radio-based technologies.
Nexans provides integral cabling for the 35-mile long Lötschberg railway tunnel in Switzerland, which will be the longest in Europe. Along with energy and optical fiber links, radiating cables will assure full GSM-R operability.
LIST fire-detection system 
Nexans furnishes a complete linear fire-detection system for difficult environments (like tunnels) providing early warning and no false alarms. It is easy-to-install, zone programmable, and immune to electromagnetic interference. The system includes sensor and communication cable, control units, connection boxes, accessories and software.
This system was installed in Lerida, Spain, in a 1.5 km train tunnel for both regular and high-speed train traffic. Using multiple sensors, the system can pinpoint fires accurately, and requires neither maintenance nor calibration.
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