Aloha Demonstration Module

1
Aloha Demonstration Module

• Cabled Observatory Presentation
• School of Ocean and Earth Science and Technology
• October 2006

2
Purposes

• To demonstrate the feasibility of SL280 and SL560
  cable reuse.
• To fully test the data transport with Format and
  Bit Rate Independent streams.
• To collect useful hydrophone and pressure gauge
  (Tsunami Gauge) data.
• To promote interest in ocean bottom data.

3
SL Cable Data Channel

• SL280 and SL560 cables use PDH1 data format
• VERY complex format and structure
• VERY dynamic routing
• Complex supervisory overhead
• MOST of this is not needed for observatories.
• 1 Plesiochronous Data Hierarchy

4
Using Existing Format

• Need to add a Dummy Mini-TTE so that Makaha
  thinks it is talking to California
• Need Frame Relay to get Ethernet into Phone
  System Format.
• Most existing COTS equipment is power-hungry and
  not meant to fit into pressure case.
• Again, most functions are not needed.

5
Its free? Why not use it??

• Power Drain.
• Complexity.
• Reliability.
• Development Time.
• Cost.
• Space constraints.

6
Reducible Complexity
7
Development of Proof Module

• Uses Wideband Hydrophone from HUGO SEM
• Long period to 100 seconds
• DigiQuartz pressure / Tsunami gauge
• 24-bit stereo A/D Converter at 96 ksps.
• Simple Rabbit 3000 controller.

8
Integration with Muldex

• The Proof Module provides real-time experience
  with encoding signals with the Tremblay Data
  Transport Muldex.
• PCB layout of Muldex and testing of circuit.
• Second-generation Muldex
• Clock divider for SL560 supervisory functions
• Improved Muldex PCB layout.

9
Development of Data Channel

• Installation of TTE gear at Makaha ahead of Aloha
  Observatory deployment.
• Installation and testing of data link from Makaha
  to UH.
• Development of first round data distribution
• Webcast audio
• Downloadable data files

10
Installation of Makaha PFE

• Power Feed Equipment will operate at lower power
  during first phase.
• It will be thoroughly burned-in and tested by the
  time the Aloha Observatory is deployed.

11
Conclusions

• The Proof Module phase
• Tests the Muldex Data Transport
• Tests the SL280 cable
• Tests the Makaha PFE
• Tests the Makaha UH data channel
• Tests the data file distribution
• Provides months of valuable scientific data

12
conclusions

• The Proof Module splits the deployment of the
  Aloha Observatory into two manageable projects.
• The entire shore installation and the wet plant
  will be tested and ready when we deploy the
  Observatory