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This is Alcatel-Lucent's Greenwich factory — the same site where part of the first transatlantic cable was built in the mid-19th century.
These days, the factory is used to build three particular pieces of cable kit: repeaters, branching units and power feed equipment.
This is one of Alcatel-Lucent's repeaters, which are used to amplify the signal at various points along the cable.
This repeater, a model from two years ago, has a throughput of around 1.5 terabits per second.
Alcatel-Lucent also makes branching units at its Greenwich facility.
This is the component that would be used to split off connectivity to a site that the cable passes by — for example, to Congo on the West Africa Cable System (WACS), which runs from the UK to South Africa, that Alcatel-Lucent is building.