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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.
This power feed equipment, produced at Alcatel-Lucent's Greenwich facility, is destined to be deployed where the WACS line comes ashore in Congo. This is the kit that powers the repeaters along a submarine cable.