NDLI: Latest Generation Subsea Observatory Standards

Content Provider	IEEE Xplore Digital Library
Author	Barlow, S. Flynn, J. Mudge, W.
Copyright Year	2007
Description	Author affiliation: Ocean Design Inc., Daytona Beach (Barlow, S.; Flynn, J.; Mudge, W.)
Abstract	With the advent of the modern subsea observatory, two basic system architectures have emerged enabling the scientific community to study the oceans in an efficient manner for the region of interest, providing cost efficient, reliable, and proven solutions. Ethernet and optical networks dominate subsea communications architectures as utilized on programs such as MARS, VENUS, NEPTUNE, and NEMO due to the already developed and proven telecommunications hardware used in each application. With the two basic hardware configurations these observatories employ, a standard configuration has been generated that may enable experiments to be moved between observatories. This simple function of interconnectivity for experiments between observatories enables the study of oceanographic events on a global scale for the first time in history while creating efficiencies for funding. With currently planned hardware, a single experiment may study at least four different geographic regions with a minimum of three more locations available in the near future. The three main factors that define the architecture requirements of a modern subsea observatory are power, communication rate, and the distance required between regions of interest. Power defines the abilities of the node to support high wattage equipment like lights and other sensor arrays, while also affecting step-out distance due to the decrease in voltage based on resistive loads. Communication rates are vital as they define the systems ability to support instruments with high bandwidth such as cameras and remain competent over their design life spans. As the need increases for subsea information, so will the requirement for data rates. Observatories need to be able to upgrade throughout their lives to ensure they are able to meet the needs of future experiments. Subsea observatories also maintain the capability to be expandable into an entire subsea local area network (LAN) of sensors creating a need to evaluate step-out distances and repeaters. Ethernet-based communications have a maximum length of ~ 70 meters making them ideal for specific regions of interest. As some applications have found, the regions of interest can span many more square kilometers than is logistically viable for Ethernet-based communications architectures to support, leading to the need for an optically- based communications architecture which is able to support much longer step-outs. Using a standard set of existing equipment that is designed for, and can be configured for, each specific application's environment will minimize the cost and improve the reliability of the system by removing the need for engineering and qualification of new and unproven hardware. This paper will present an overview of the latest generation of subsea observatories; focusing on the system architecture and discussing enabling interconnect hardware currently available, as well as highlighting future possibilities. Current technologies in each of the three main factors will be explored and discussed with special emphasis on how to design the most reliable systempossible while reducing project costs due to design and development work. Specific examples from current subsea observatories will be cited, including their proven hardware choices, demonstrating they have achieved a subsea interface standard between programs providing a global solution to the scientific community.
Starting Page	1
Ending Page	5
File Size	3568248
Page Count	5
File Format	PDF
ISBN	9780933957350
DOI	10.1109/OCEANS.2007.4449380
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-29
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Observatories Hardware Costs Sensor arrays Oceans Telecommunication network reliability Ethernet networks Optical fiber networks Mars Venus
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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