Abstract: A system for enabling communication between an underwater fluid extraction facility and a remote location comprises a fiber-optic cable connected between the facility to the remote location, signal transmission means at the remote location for transmitting signals to the fiber-optic cable, a distribution hub for receiving signals from the other end of the cable and at least one secondary hub located at the facility in communication with the distribution hub. Communication between the facility and the remote location is effected using a Local Area Network. Preferably Ethernet signalling is used throughout the network.

Abstract: A system for enabling communication between an underwater fluid extraction facility and a remote location comprises a fibre-optic cable connected between the facility to the remote location, signal transmission means at the remote location for transmitting signals to the fibre-optic cable, a distribution hub in the facility for receiving signals from the other end of the cable and at least one secondary hub located at the facility in communication with the distribution hub. Communication between the facility and the remote location is effected using a Local Area Network. Preferably Ethernet signalling is used throughout the network.

Abstract: A hydrocarbon production installation comprising a surface station and an underwater hydrocarbon extraction facility, the surface station and extraction facility being electrically linked via an umbilical cable, the installation further comprising means for transmitting first and second components of a communications signal and power from the surface station to the extraction facility via the umbilical cable. The transmitting means including means for passing the communications components through the umbilical cable in a balanced manner. The transmitting means further comprises means for transmitting the power through the umbilical cable superimposed on the communications components, and the facility comprises means for receiving the communications components and separating the power from the communications components.