transportable satellite-based internet connectivity dr. bob dixon chief research engineer oarnet...
TRANSCRIPT
Transportable Satellite-Based Internet Connectivity
Dr. Bob DixonChief Research Engineer
OARNet Ohio State University
SURA/ViDe Digital Video Workshop April 23-25, 2002 Birmingham, Alabama
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
Tachyon Satellite Network
Covers North America, Central America, Hawaii, Europe
Earth stations in San Diego and Amsterdam
Optimized for IP traffic; guaranteed speeds
NOC monitors all stations continuously
ADEC Satellite Network
A portion of the Tachyon satellite network
Separate NOC at OARNet
ITEC-Ohio pushes the state of the art
50 sites on the air today; 90 in a year
A few transportable systems
Internet 1 orInternet 2
EarthSatellite
Permanent Ground Station
Tachyon Central Ground Station San Diego
Internet Instructional Sites
Instructional Sites
Instructional Sites
Transportable Ground Station
Tachyon Network Access Points
Small (2x3 feet) portable dish.Usually permanently mounted on a roof.
$4K installed + $1.5K/month max.
Maximum speed is2 Mbits down, 512 Kbits up, guaranteed.
Lower speeds are available at lower costs.
Example Tachyon Satellite Dish Installation
Transportable TAP Design Goals
Inexpensive to build and operate
Off-the-shelf parts for easy duplication
Easy to operate by one person with one day training
Small and light
Reliable and adaptable to diverse field conditions
Easily modified
Tachyon Transportable Access Point
Some Initial 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.
In addition to construction and operation:
Develop improved designs.
Demonstrate at conferences.
Publish papers.
Provide complete plans for duplication.
Provide training on use of the system.
Provide consultation on design, construction, operation.
Arrange for turnkey system purchases.
Satellite Trailer Subsystems
Dish and Radio Transceiver
Power
Leveling and Aiming
Heating and Cooling
External Connections
Computer
Ground Station Power Alternatives
(ALL are provided)
Local Power Outlet unlimited(long extension cord)
Batteries via UPS at least 4 hours before(computer controlled) recharging
Gasoline generator at least 24 hours before(pushbutton start) refueling
Type of power Running Time
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 screw adjustments, traditionally.
Our method - dish is aimed traditionally at home location, and locked to the trailer. Thereafter the trailer itself is aimed. Faster, easier and more precise.
Weatherproof Equipment Rack Cabinets
Mounted on trailer on shock absorbers.
Automatic thermostatically controlled heater.
Automatic thermostatically controlled cooling fan.
No actual air cooling. Use parasol if needed.
Contents: Radio transceiver UPS and two external battery packs Spectrum analyzer Ethernet switch Laptop PC docking station Local wireless access point Storage for miscellaneous small parts and tools
Instructional Site
Transportable Ground Station
Long-Range wireless (miles)
Wall-Penetrating wireless (several walls)
Local Wireless (200 ft)
Local EthernetCable (200 ft)
Local PowerCable (200 ft)
Ground Station to Instructional Site Connection Alternatives(ALL are provided)
Instructional Site Internal PC Connection Alternatives
Ethernet Switch
PCsGround Station
PCs
PCs
Ground Station
Ethernet Switch
Ground Station
Ethernet Switch
Ground Station
Existing LAN
PCs
ExternalWireless
Internal Wireless
InternalEthernet
Internal LAN
(ALL are provided)
Ground Station
Wireless Router
PCsExternal and Internal Wireless
Computing System
Laptop PC in docking station
Runs 3 special programs:
Satellite aiming Dish Transceiver control and monitoring UPS control and monitoring
Also supports Internet access testing:
Web browsing Email H.323 Video Conferencing Distance Learning tools
Fitting the UPS batteries into the outdoor cabinet
UPS Batteries inoutdoor cabinet
40% of the UPS batteries
Start of Dish Assembly Process
Dish assembly continues; instructions lost.
Dish base completed; so far so good
Success! Dish fullyAssembled in one day.
PolycomViewstation
PolycomViewstation
A/V INA/V IN
A/V OUT A/V OUT
Internet 1 andInternet 2
EarthSatellite
ITEC-Ohio Ground Station
Tachyon Ground StationSan Diego
User Demo Site
User Demo Site
Earth Satellite H.323 Video Demonstration System