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Technological Infrastructure for Subsea Observatories Neville Hazell Alcatel Submarine Networks. Antoine Lecroart Alcatel-Lucent. Cable Science Observatories Solutions. Technology Pedigree Dry-Wet from Dry-Dry Architecture Optical Design IP and PTP Powering Ocean Engineering

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Technological infrastructure for subsea observatories neville hazell alcatel submarine networks

Technological Infrastructure for Subsea ObservatoriesNeville HazellAlcatel Submarine Networks

Antoine Lecroart

Alcatel-Lucent


Cable science observatories solutions
Cable Science Observatories Solutions

  • Technology Pedigree

  • Dry-Wet from Dry-Dry

  • Architecture

  • Optical Design

  • IP and PTP

  • Powering

  • Ocean Engineering

  • Conclusion

  • Q&A




Trans-oceanic or Regional connectivity

Deep water connectivity

Dry-Wet evolves from Dry-Dry

  • Traditional systems are Dry-Dry – No Subsea access

    • Proven submerged wet equipment ; - cable, repeaters, Branching Units

    • Being adapted to floating structures (Platforms or FPSOs) with dynamic risers


Sub sea connectivity

Dry-Wet evolves from Dry-Dry

  • Very different to go Dry-Wet

    • Flexibility – subsea access required

    • Plug & Play – standardised ports

  • Power needs to be treated differently

    • Power required locally on the sea bottom

    • Variable loads


Architecture overview
Architecture: Overview

  • What are your network requirements??

    • Length

    • Availability

    • Maintenance

    • Number of nodes

    • Power

      • Total

      • Node

    • Bandwidth


Architecture regional overview
Architecture: Regional Overview

  • Gateway to local instrumentation network (or junction boxes)

  • Sturdy Backbone

    • Telco grade equipmentCable, BUs, repeaters

  • High Availability – 99.9 %

    • Duplicate routes

  • Extendable


  • Architecture regional overview1

    Science

    Instruments

    Repeaters

    R

    Backbone cable

    JunctionBox

    Node

    BU

    ShoreTerminal

    R

    Science

    Instruments

    R

    ShoreTerminal

    R

    Science

    Instruments

    Node

    BU

    JunctionBox

    R

    R

    BU

    JunctionBox

    BU

    R

    Spur cable

    Branching Units

    Node

    Node

    JunctionBox

    Science

    Instruments

    JunctionBox

    Architecture: Regional Overview

    • ~ 800 km

    • Ring configuration >> High availability from duplicate routes

    • 9 KW of power per node, 2 Protected GigE per node

    • Use of Wet-mate connectors, ROV serviceable node


    Architecture optical transmission mesh vs ring

    Node

    Node

    Pt. Alberni Station

    Node

    Node

    Architecture: Optical transmission;- Mesh vs. ring

    Ring can use DWDM

    • Each node has a set of wavelengths

    • Dedicated bandwidth (not shared)

      Ring make powering easier to control

    • Latching switching BU

      Ring is simpler

    • No undersea routing necessary (Level 2 is enough)

      Ring is sturdier

    • A node may be lost without affecting the rest of the network


    Architecture power transmission series vs parallel

    Node

    Branching Unit

    Backbone Cable

    Power Feed Equipment

    MV Converter

    Spur Cable

    Node

    Pt. Alberni

    Shore Station

    Node

    Node

    Architecture: Power transmission Series vs. Parallel

    • 10 KV DC transport requireddue to network size andremote extension capabilities

    • Parallel mode is the onlyway to have large amountsof power at each site(9 KW)

    • DC/DC conversion is mandatory(MV Converter)

    • A DC power grid!


    Line design
    Line Design

    Subsea node uses a small form factor node WDM transponder

    • Based on Alcatel-Lucent 1696MS Compact Shelf with two transponders(facing East and West)

      • Transponder boards

        • Maps 2 GigE intoan STM-16/OC-48

        • FEC

        • High Performance Optics

    • Ring is designed for future

      extension

      • Up to 1800 km

      • Up to 10 nodes

      • Some nodes could befurther upgraded to 10 Gbit/s


    Ip and ptp

    Node

    Data Switches

    Data Switches

    Node

    Gigabit Ethernet

    Pt. Alberni

    Shore Station

    Node

    Node

    IP and PTP

    Dual star with redundant GigE paths

    • Alcatel-Lucent 7450 Routersand 6850 Switches (stacked)

      Network is designed totransport PTP packets withminimum delay to distributeprecision timing

    • Tested with PTP serverand PTP client successfully

    • ~ 10 s accuracy

      Uses the latest Level 2 mechanisms such as LACP

    • Minimizes delays andallows fast path protection


    Powering
    Powering

    • Powering is NEPTUNE’s main departure from a telco system and requires:

      • An optically controlled four statepower switching BU (latching)

      • BUs and repeaters qualified

        to up to 8A of line current

      • High power (2 x 80 KW)

        PFE using the AC mains


    Powering medium voltage converter mvc
    Powering: Medium Voltage Converter (MVC)

    • Reliable 9KW 10 KV to 400 V DC converter in each node

    • Parallel/Series arrangement of 48 elementary converters


    Powering low voltage power system lvps
    Powering: Low Voltage Power System (LVPS)

    • Unique 400 V monitoring, control and distribution unit in each node

      • Integrated with the Topside Node Controller

      • Built around a micro-controller


    Ocean engineering
    Ocean Engineering

    COTS equipment in the node call for the use of ROV wet-mate connectors to be able to service the node down to 3500 m

    Node is in two parts:

    • Trawl Resistant Frame (TRF)

      • Detachable Cable

        Termination Assembly (CTA)


    Ocean engineering1
    Ocean Engineering

    • NodeModule (NM)

      • Can be disconnected fromthe Science Instrumentsand the TRF for maintenance

      • Node module is made almostneutrally buoyant so thatit can be handled bya work class ROV

      • Composed of the MVC andLV/Comms pressure vessels


    Coastal observatories
    Coastal Observatories

    • 10kV/400V Power system

      • Fixed BU

    • Direct fibre access to Junction Box

    • Simplified Node

    Branching Unit

    Node

    Junction Box



    Conclusion
    Conclusion

    • Alcatel-Lucent with its subcontractors (L-3 MariPro, Texcel, ODI, Heinzinger, Westermo, Omnitron) is developing the first large scale Regional Dry-Wet network

    • The Technology may be readily adapted for Coastal Observatories

    • The University of Washington and the University of Victoria were the first to see the potential of this concept for oceanography and interest is also high in Asia and Europe


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