Download Alcatel Cable Observatory v2 - Norwegian Ocean Observatory

Technological Infrastructure for Subsea Observatories
Neville Hazell
Alcatel Submarine Networks
Antoine Lecroart
Alcatel-Lucent
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Cable Science Observatories Solutions
Technology Pedigree
Dry-Wet from Dry-Dry
Architecture
Optical Design
IP and PTP
Powering
Ocean Engineering
Conclusion
Q&A
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Technology Pedigree
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Technology Pedigree
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Dry-Wet evolves from Dry-Dry

Traditional systems are Dry-Dry – No Subsea access
 Proven submerged wet equipment ; - cable, repeaters, Branching Units
Trans-oceanic or Regional connectivity

Being adapted to floating structures (Platforms or FPSOs) with dynamic risers
Deep water connectivity
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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
Sub sea connectivity
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Architecture: Overview
What are your network requirements??
 Length
 Availability
Length
Data Transmission
 Maintenance
<100 m
10/100 BaseT Electrical
 Number of nodes
< 10 km
10/100 BaseT Optical
 Power
1GE optical
 Total
 Node
 Bandwidth
Power - DC
12/48/400 V
12/48/400 V
< 1MBit/s electrical
<100 km
10/100 BaseT Optical
Coastal
1GE optical
400 V, 10,000V
9,600 Bit/s electrical
<1,000 km
2.5/10 Gbit/s Optical SDH
Regional
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10,000 V
Architecture: Regional Overview
Gateway to local instrumentation network (or junction boxes)
Sturdy Backbone
– Telco grade equipment
Cable, 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
Science
Instruments
Junction
Box
Repeaters
R
Node BU
Science
Instruments
Science
Instruments
R
Node
BU
Junction
Box
BU
Junction
Box
Junction
Box
Shore
Terminal
R
Node
BU
Branching Units
Node
Science
Junction
Instruments
Box
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Shore
Terminal
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
Node
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
Pt. Alberni Station
Node
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Node
Architecture: Power transmission Series vs. Parallel
Node
10 KV DC transport required
due to network size and
remote extension capabilities
Parallel mode is the only
way to have large amounts
Node
of power at each site
(9 KW)
DC/DC conversion is mandatory
(MV Converter)
A DC power grid!
Pt. Alberni
Shore Station
Node
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Node
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 into
an 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 to
transport PTP packets with
minimum delay to distribute
precision timing
 Tested with PTP server
and PTP client successfully
Node
Gigabit Ethernet
Node
 ~ 10 s accuracy
Uses the latest Level 2
mechanisms such as LACP
Pt. Alberni
Shore Station
 Minimizes delays and
allows fast path protection
Node
Node
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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 from
the Science Instruments
and the TRF for maintenance
 Node module is made almost
neutrally buoyant so that
it can be handled by
a work class ROV
 Composed of the MVC and
LV/Comms pressure vessels
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Coastal Observatories
10kV/400V Power system
Fixed BU
Direct fibre access to Junction Box
Simplified 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
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