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The Application of Distance Education Using Advanced Hybrid Networking
Chinese-American Networking SymposiumShanghai, People's Republic of China
August 21-23, 2002
Dan CottonUniversity of Nebraska, Lincoln
American Distance Education Consortium (ADEC)
American Distance Education Consortium
WWW.ADEC.EDU
ADEC
• Janet Poley, President
• Ancillary organization of the University of Nebraska
• 12 year old non-profit organization of 50 plus state universities and land grant colleges
• Local, state, national and international partnerships
Advanced Internet Satellite Extension Project (AISEP)
• 3 year, National Science Foundation (NSF)
• $4 million
• NSF Supplements– Research Experiences for Undergraduates (REU)– Chinese - American Networking Symposium (CANS)– Experimental Program to Stimulate Competitive
Research (EPSCoR)
Advanced Internet Satellite Extension Project
• Partnerships– ADEC, Internet2 Universities, smaller and minority
serving institutions, rural and remote learners– Tachyon, Inc.– OARnet & ITEC-Ohio (Internet2 Technology
Evaluation Center) – University of California San Diego Supercomputer
Center - SDSC– Cooperative Association for Internet Data Analysis -
CAIDA– National Laboratory for Applied Network Research -
NLANR
Lead Institutions for AISEP
• University of Nebraska-Lincoln
• University of Maryland-College Park
• University of Illinois
• North Carolina State University
• North Carolina A&T University
• Washington State University
Goal
• Bring advanced networking applications to geographically remote campuses and learning centers for purposes of research, teaching and extension.
Project will:
• enable unreachable campuses, remote learning centers, extension offices to share in advanced networking research and applications
• create access for the research university community to scientific, cultural and human resources otherwise inaccessible
Objectives
AISEP will:• explore use of satellite to deliver Internet
services to determine compatibility of satellite technology with I2 services and applications
• explore deployment and integration of DE applications, including collaborative applications at rural, remote institutions and extension learning centers
Tachyon.net
ADEC Network - SDSC
Typical Tachyon Satellite Dish Installation
ADEC Network Site Map
Research objectives
• establish standards for "acceptable, application- based Internet" for remote locations
• understand how to establish, build and support a satellite-based IP network
• Connect Tachyon satellite gateway to the San Diego NAP (I1 and I2 service)
• Provide CPEs (formerly TAPS) to ADEC member institutions (70 sites)
Research objectives (continued)
• investigate QoS
• study network performance
• determine requirements to support this type of network
• determine parameters for a sustainable business model
Transportable Dish System
Internet 1 orInternet 2
EarthSatellite
Permanent Ground Station
Tachyon Central Ground Station San Diego
Internet Instructional Sites
Instructional Sites
Instructional Sites
Transportable Ground Station
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• Reliable and adaptable to diverse field
conditions• Easily modified
Initial Applications
• Provide distance learning in rural/remote and underserved areas
• Link field research to campus computers, laboratories, and collaborators worldwide
• Link field instruction and demonstrations to campus classrooms
• Link field activities to remote databases using devices such as PDAs
• Remote monitoring of construction projects
• Special events, conferences, fairs, disasters, etc.
Portable
Satellite Trailer Subsystems
• Dish and radio transceiver
• Power
• Leveling and aiming
• Heating and cooling
• External connections
• Computer
Next steps
• Develop improved designs
• Demonstrate at conferences
• Publish papers
• Provide training on use of the system
• Provide consultation on design, construction and operation
• Arrange for turnkey system purchases
Application Testing
H.323 Over Satellite
Variables• Tachyon Network
– Satellite IP, asynchronous, bandwidth settings dedicated vs. non-dedicated service
• Polycom– dialing speeds
• Internet1 – Internet2• Point-to-point, multi-point• Data flow: uplink > downlink, downlink > uplink• Network traffic, noise• H.323• Multipoint Control Unit (MCU)
Testing
• Test tape• Internet1 and Internet2• Tachyon bandwidth service
– 2mb/256k non-dedicated– 2mb/512k non-dedicated
• Identify optimum Polycom speed per Tachyon bandwidth service
• Video tape results
Internet 1 orInternet 2
EarthSatellite
Ground Station
Tachyon Central Ground Station San Diego
Internet Instructional Sites
Instructional Sites
H.323 Testing
ITEC-Ohio
Observations
• Data rate
• Frame rate
• Packet loss
• Pixilation
• Latency
• Jitter
Preliminary results
• Some fluctuations in quality
• Some packet loss
• It worked!
• Excellent video– Internet2 <> 2Mbps / 512Kbps with 384Kpbs
Tachyon service level
Program Design
ADEC H.323 Presentation for Megaconference III
Lessons Learned
• Hybrid networking works• Television techniques can be applied….and they
positively impact program quality– Studio cameras– Studio lighting– Studio set– Microphones– Producer / director
• Don’t limit your thinking….explore all possibilities
Multicast Over Satellite
Variables
• Internet2 <> Tachyon– PIM Sparse Mode (Internet2) versus DVMRP (Tachyon)
• IGMP
• Internet1, and non-multicast enabled sites– Cisco– Quickcom
• MPEG– VBrick– Other technologies
Testing/Observations
• Internet2 <> Tachyon– Iowa State University – video streaming
• ITEC-Ohio– ADEC router configuration– Monitoring
• Works quite well!
Research Projects
• EPSCoR– …to extend the AISEP test-bed into EPSCoR states
in a systematic fashion, as well as test specific remote sensing, GIS and other scientific applications of hybrid networking, including satellite
– …using appropriate combinations of fiber, satellite, wires and radio technology to carry signals in combination with software and devices for data collection, communications, visualization and decision making
Research Projects
• EPSCoR– 8 sub-projects
• Land management• Aquaculture• Water conservation and management• Environmental monitoring
Nebraska Research, Teaching and Extension Project
• Internet2 Applications to Enhance the Management of Natural and Agro-ecosystems.”– Carbon Sequestration and Global Climate
Change– Improved Efficiencies of Nitrogen and
Irrigation Management– Grazing Behavior of Cattle in the Nebraskan
Sandhills
Internet 2
EarthSatellite
SatelliteIP
Tachyon Central Ground Station San Diego
University of NebraskaLincoln
Data loggers and sensors
Tachyon Access Point (TAP)
Computer
802.11b network
Improved Efficiencies of Nitrogen and Irrigation Management
Why this work?
• ADEC believes distance education….– is about providing new knowledge and
information wherever and whenever the learner is ready to take advantage of it
– positively impacts competition– leads to improved economic development– aids in cultural sharing and understanding– is vital in community building– requires advanced networking and
information technology
Credits
• Janet Poley, Ph D– President of ADEC
• Bob Dixson, Ph D, PE– Chief Research Engineer– Ohio State, OARnet
• Paul Schopis– Senior Network Engineer– ITEC-Ohio
Questions