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This is the commentary building which hosts 20 positions for radio upstairs, and 20 for TV downstairs.
Among the needs of the Tour — a fibre optic network in the press centre and technical area at a constant speed of 2Gbps for the press and other professionals, plus a set of dedicated wi-fi networks for organisers, journalists, television channels, photographers, and commentators. For the UK stages, that meant an extra 21 international gigabit Ethernet circuits between England and France.
Because the press centre is often kilometres from the end of the race, interviews with the riders are done via high definition video conferencing using a 20Mbps connection between the 'interview bus' to the press room.
The camera over the finish line is at the top of this crane — complete with yet more cabling...
Because the Tour is always on the move, the technical infrastructure has to assembled and then taken apart and reassembled again at breakneck speed to be ready for the next stage. Terreaux has two teams of 25 engineers working in tandem — while the London stage is still taking place, one team had already gone ahead to start work on the next stage.
The team remaining behind in London start disconnect after the last TV broadcast around 8pm, and then take the ferry back across to France to start everything again.