layer hidden off the screen
Communications
Overiew
Surface-Habitat
Intra-Habitat
Habitat-Vehicles
The Cable
References
General Structure of the cable
The radius that the ROV will have to scan is around 5 metres around the Manned Vehicle. Hence we decided to make the tether approximately 8 -10 metres long, to provide flexibility of movement and reduce the possibility of tension build-up in the cable.
The cable we have now choses, provides a bandwidth of 1.544Mbps which can be increased if required. The cable cost around USD6-10 per metre and due to its length does not require repeators. Since optical fibre is free from electro-magnetic interference, the power line can run alongside the optical fibre.
Coming to the connector linking the cable to the vehicles at both ends, the technology that is used to transmit the optical data through the connector is based on expanded beam. It works as suggested by expanding the beam of light in the fibre in the transmitting half of the insert using one set of lenses, and then having the beam collected again in the receiving half by another set. Expanded beam insert has been favoured because of their mechanical ruggedness and because of the fact that there are no moving parts in them. This ensures trouble free operation in harsh environments that could easily be damaging to connectors using ferrules and fibre to fibre butt methods.
4 way x OPTIC
12 way x no. 16
2000 Vrms
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References
