A subsea well control system comprises: a well tree (6 or 7) having a subsea control module (10 or 11); and a power and communications distribution module (5) for communication with the subsea control module via a communication link (8 or 9) between the subsea control module and the distribution module. The link comprises a 4-wire dual twisted copper pair as part of an RS422-based interface.
https://app.acclaimip.com/pdf/FBgjNuqM5QWkGCNTD4zlCc8-cxqvUnNaMnmq0hU/US20100207783A1
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