technological infrastructure for subsea observatories neville hazell alcatel submarine networks
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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 - PowerPoint PPT PresentationTRANSCRIPT
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Technological Infrastructure for Subsea
Observatories
Neville Hazell
Alcatel Submarine NetworksAntoine Lecroart Alcatel-Lucent
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Cable Science Observatories Solutions Technology PedigreeDry-Wet from Dry-DryArchitectureOptical Design IP and PTPPowering Ocean EngineeringConclusionQ&A
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Technology Pedigree
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Technology Pedigree
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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
Dry-Wet evolves from Dry-Dry
Trans-oceanic or Regional connectivityTrans-oceanic or Regional connectivity
Deep water connectivityDeep water connectivity
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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
Dry-Wet evolves from Dry-Dry
Sub sea connectivitySub sea connectivity
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Architecture: Overview
What are your network requirements?? Length Availability Maintenance Number of nodes Power
Total Node
Bandwidth
Length Data Transmission Power - DC
<100 m 10/100 BaseT Electrical 12/48/400 V
< 10 km 10/100 BaseT Optical
1GE optical
< 1MBit/s electrical
12/48/400 V
<100 km
Coastal
10/100 BaseT Optical
1GE optical
9,600 Bit/s electrical
400 V, 10,000V
<1,000 km
Regional
2.5/10 Gbit/s Optical SDH
10,000 V
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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
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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
Spur cable
Backbone cable
JunctionBox
ShoreTerminal
ScienceInstruments
ScienceInstruments
ShoreTerminal
JunctionBox
JunctionBox
JunctionBox
ScienceInstruments
JunctionBox
ScienceInstruments
R
R
RR
RR
R
BUBU
BU
BU
Repeaters
Branching Units
Node
Node
Node
Node
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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
Node
Node
Node Node
Pt. Alberni Station
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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!
Bra
nchi
ng U
nit
Spu
r Cab
le
Node
Node
Node Node
MV
Con
verte
r
Pt. AlberniShore Station
Bac
kbon
e C
able
Pow
er F
eed
Equ
ipm
ent
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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 be
further upgraded to 10 Gbit/s
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IP and PTP
Dual star with redundant GigE paths Alcatel-Lucent 7450 Routers
and 6850 Switches (stacked)
Network is designed totransport PTP packets withminimum delay to distributeprecision timing Tested with PTP server
and PTP client successfully ~ 10 s accuracy
Uses the latest Level 2 mechanisms such as LACP Minimizes delays and
allows fast path protection
Dat
a S
witc
hes
Dat
a S
witc
hes
Pt. AlberniShore Station
Node
Node Node
Node Gigabit Ethernet
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Powering
Powering is NEPTUNE’s main departure from a telco system and requires: An optically controlled four state
power 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
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Powering: Medium Voltage Converter (MVC)
Reliable 9KW 10 KV to 400 V DC converter in each node
Parallel/Series arrangement of 48 elementary converters
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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
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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)
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Ocean Engineering
Node Module (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
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Coastal Observatories
10kV/400V Power systemFixed BU
Direct fibre access to Junction BoxSimplified Node
Branching Unit
Node
Junction Box
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Coastal Observatories – simplified node
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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