Marconi watches the underground

RATP, the Paris transport authority, has chosen Marconi to build a new multiservice broadband network for the Paris Metro and the city’s train, bus and tram systems.

Régie Autonome des Transports Parisiens (RATP), the Paris transport authority, has chosen Marconi to build a new multiservice broadband network for video surveillance, voice communications and data services for the Paris Metro and the city’s train, bus and tram systems.

When complete the £8 million (€14 million) network will be one of the largest ATM (Asynchronous Transfer Mode) networks installed anywhere in Europe. It will support up to 6,000 cameras and 300 video monitors, as well as connecting 400 PABXs (Private Automatic Branch Exchanges), linking some 40,000 telephone lines, and 1,500 Local Area Networks across 500 Metro, train and bus stations.

RATP’s network will also provide new services for passengers, such as Internet access and an internal video channel.

Deployment of the backbone network for RATP is due to begin in the summer of 2002.

The project itself comprises two distinct parts: core ATM switches and edge switches. In the main core, Marconi’s solution will deploy ASX-4000 multiservice switches in six key locations, connected in a full mesh via redundant STM-4 links.

As the network evolves, the links can be upgraded to STM-16 to support up to 2.5 Gbit/sec transmission. For aggregation purposes, the inner core will use 32 ASX-1000 multiservice switches, each connected to the core ASX-4000s via two STM-4 links.

For the access, ASX-200BX multiservice edge switches will be deployed in each of the 500 metro, train and bus stations, connected to the ASX-1000s via dual STM-1 links.

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