2. Overview and components of the ground-to-ground transmission network

2.1 General principle

The principle of the ground-to-ground transmission network (TSS) chosen for Strasbourg's tramway line B consists in transmitting all the information required for the line's operation over an ATM backbone network:

• telephone, SAI (Système d'aide à l'information) and public address (audio) services grouped together under the term low-speed network;

• railway signalling, BMS (centralized technical management), energy and ticketing services grouped together under the LAN/Ethernet network;

• video services with the video network.

Voice-data-image (VDI) traffic on the TSS network is enabled by ATM technology, using ATMLightRing...