Providing the power, signal and mechanical link between a surface vessel and the ROV deployment system, i.e. tether management system (TMS), "cage" or "garage", these cable types must comfortably support the weight of the TMS containing the ROV, its Tether and any ancillary packages that may be required whilst also allowing for extraneous forces due to vessel motion and tidal forces.

Signal components, including relay of video or system telemetry, may be transmitted via optical fibres or electrical cores (often in the form of twisted pairs, quads or co-axials). Power is often transmitted electrically at voltages up to 3,500 V.

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