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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
slide5

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
slide6

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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