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Internet - To - Go
Dr. Bob DixonChief Research Engineer
OARNet and Ohio State University
SURA/ViDe Annual Digital Video WorkshopAtlanta, GeorgiaMarch 25, 2003
A Small Mobile Satellite System for Internet Access Anywhere
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American Distance Education Consortium (ADEC)
63 Land-Grant colleges
NSF grant to provide distance learning via satellite to minority colleges:
Tribal Indian Historically Black Hispanic
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Tachyon Satellite Network
Covers North America, Central America, Hawaii, Europe
Earth stations in San Diego and Amsterdam
Optimized for IP traffic; stable speeds
Network Operations Center monitors all stations continuously
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ADEC Satellite Network
A portion of the Tachyon satellite network
Separate Network Operations Center at OARNet
Internet Technology Evaluation Center-Ohio pushes the state of the art
55 sites on the air today; 90 in a year
A few transportable systems being planned
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Internet 1 orInternet 2
EarthSatellite
Permanent Ground Station
Tachyon Central Ground Station San Diego
Internet Instructional Sites
Instructional Sites
Instructional Sites
Transportable Ground Station
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Tachyon Network Access Points
Small (3 feet) diameter dish.Usually permanently mounted on a roof.
$4K installed + $1.2K/month max. (special low rates for educational use)
Maximum speed is1.5 Mbits down, 512 Kbits up
Lower speeds are available at lower costs.
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Typical Permanent Tachyon Satellite Dish Installation
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Transportable System Design Goals
Provide high-speed Internet access for ALL purposes, including computers, telephones and PDAs.
Inexpensive to build and operate
Off-the-shelf parts for easy duplication
Easy to operate by one person with one day training, with no hand tools.
Small and light
Reliable and adaptable to diverse field conditions
Easily modified
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Planned ApplicationsProvide distance learning in underconnected locations such as rural areas and inner cities.
Demonstration / Evaluation for a future fixed installation.
Link field research to campus computers and laboratories and collaborators worldwide.
Link field instruction and demonstrations to campus classrooms.
Link field activities to remote databases, eg via PDAs.
Special events, conferences, fairs, disasters, etc.
Remote monitoring of construction projects.
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Actual Applications
Distance Teaching and Learning Conference Madison, Wis. August 2002
Ohio Farm Science Review rural Ohio, Sept 2002
National Farm Progress Show rural Iowa, Sept 2002
Distance Learning Conference Worthington, Ohio October 2002
Ohio Academic Resources Network conference Columbus, Ohio November 2002
Kentuckyana Cattle Auction rural Kentucky, February 2003
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In addition to construction and operation:
Develop improved designs.
Demonstrate at conferences.
Publish papers.
Provide training on use of the system.
Provide consultation on design, construction, operation.
Arrange for turnkey system purchases and rentals.
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Satellite Trailer Subsystems
Dish and Radio Transceiver
Power
Leveling and Aiming
Heating and Cooling
External Connections
Computer
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Ground Station Power Alternatives
(ALL are provided)
Local Power Outlet unlimited(long extension cord)
Batteries via UPS at least 8 hours before(computer controlled) recharging
Gasoline generator at least 24 hours before(pushbutton start) refueling
Type of power Running Time
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Aiming System
Satellites are 2 degrees apart in the sky; aiming accuracy must be better than 1/2 degree.
GPS Receiver provides accurate local position to PC.
PC calculates azimuth, elevation and polarization settings.
Dish is aimed with precision compass and inclinometer, using simple adjustments. Azimuth - motor drive Elevation - hand operated turnbuckle
No hand tools required.
Aiming maps available
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Copyright The Ohio State University.
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Computing SystemLaptop PC in docking station
Runs 3 special programs:
Satellite aiming Dish Transceiver control and monitoring UPS control and monitoring
Also supports all Internet access tools such as:
Web browsing Email H.323 Video Conferencing Distance Learning tools optional encryption
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Weatherproof Equipment Rack Cabinet
Mounted on shock absorbers.
Automatic thermostatically controlled heater.
Automatic thermostatically controlled ventilation fan.
No actual air cooling. Use parasol if needed.
Contents: Radio transceiver UPS and batteries (more batteries elsewhere) Spectrum analyzer Ethernet switch Laptop PC and docking station Local wireless access point Power line frequency meter
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Instructional Site
Transportable Ground Station
Long-Range wireless (20 miles)
Wall-Penetrating wireless(several non-metal walls)
Local Wireless (1000 ft)
Local EthernetCable (200 ft)
Ground Station to Instructional Site Connection Alternatives(ALL are provided)
1
4
3
2
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Transportable Satellite Internet System
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Transportable Satellite Internet System
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Questions?
Field trip !