high-speed network projects tibor gyires school of information technology illinois state university...
TRANSCRIPT
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High-speed Network Projects
Tibor Gyires
School of Information Technology
Illinois State University
BIAC/TAB Meeting
October 17, 2003
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Contents
1. Traditional Collaborative/Teleconferencing Systems
2. Collaboration via the Grid
3. Network Performance Measurements
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1. Traditional Collaborative/Teleconferencing Systems
Traditional Internet (PC based or Standalone)
•Needs a special room
•Uses ISDN telephone lines
•High installation cost
•High usage cost
•Scheduled in advance
•Professional operator
•Centralized control
•H.320 standard
•Use anywhere; ubiquitous
•Uses Internet
•Low installation cost
•No usage cost
•Decentralized control
•H.323/350 standards
•Require a Multipoint Control Unit (MCU), gatekeepers, etc.
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Technologies
POTS, ISDN, T-1, microwave, Satellite, and IP
Point-to-Point Multipoint
Some popular tools are: H.323 based Hardware Assist, OpenH.323, Software Clients, VRVS, MPEG, Motion JPEG (MJPEG), Access Grid, Web Clients, etc.
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2. Collaboration via the Grid
• Grid: A heterogeneous complex of advanced networks, computers, storage devices, display devices, and scientific instruments.
• NSF’s Cyberinfrastructure: An integrated system of interconnected computation, communication, and information elements that supports a range of applications.
• “Cyberinfrastructure is the means; e-Science is the result.”
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Access Grid
• A suite of hardware and software that supports collaboration via high-speed networking.
• Contains high-end audio and visual technology needed to provide a high-quality compelling user experience.
• Remote application and data sharing.
• Any site can transmit as many streams as suit their needs.
• It uses IP-multicast for the transport mechanism eliminating the need for a Multipoint Control unit (MCU).
• It is based on free available standards and open-source software.
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Access Grid (cont.)
• Enables groups of collaborators to increase productivity by reducing the work involved in finding expert resources, people, publications, source code, data and computing resources.
• Used for classroom lectures, training, invited talks, and collaborative activities, such as strategy and management meetings.
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Virtual Venues
• In order for a person or a group to communicate with another person or group, both persons or groups can meet in a virtual venue room.
• There are many virtual venue rooms available. • Some venues require reservations.
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Wide Range of Configurations
• Personal node with compact display and a single video and audio stream.
• Room node with multiple desktop computers and projectors.
• Advanced node with tiled displays and multiple video streams.
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Personal Nodes
• A minimal node has a compact display, single video stream, and single audio stream (e.g., a handheld device).
• A laptop node has a laptop display, minimum number of video streams, and single audio stream.
• A desktop node has a desktop monitor, some number of video streams, and a single audio stream.
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Personal Node Scenario
• Each person has an Access Grid node configured on his or her laptop and all the participants navigate to the same venue.
• They have unique PowerPoint and Excel files located on their laptop that they wish to share with the group.
• Their files will all appear on the venue client window and they can open each file and see each other’s files on their laptop.
• One or more participants can control the application while everyone else watches.
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Room-based Node Scenario
• Demo • Video capture and audio processing run on one
or more Linux operating system computers. • Multiple users have a shared display, multiple
video streams, and a single audio stream.• A large display area (often projected onto a
screen or wall), with 3 projectors, and microphones and cameras.
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Remote Group Interactions
• Small, informal meetings that a manager calls rapidly. • Large meetings planned in advance. • Training sessions, seminars, and classes. • Project and program reviews with other units • Medium-to-large conferences.
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Advantages
• Substantially reduce travel.• Hold regular meetings nationally or worldwide
without leaving our offices.• Real-time access to a worldwide community of
teachers, experts, researchers who collaborate over the Access Grid, both within an organization, at universities, and in industry.
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Personal Node
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Room Node
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Room Node (cont.)
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Room Node (cont.)
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An Access Grid Room
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Computing Equipment
• The Display Computer is responsible for video decoding and running applications on the Display Screen.
• The Video Capture Computer is responsible for the software compression of multiple video streams.
• The Control Computer is to run the control software for the Gentner echo cancellation hardware.
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Video Capture Computer
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Audio System
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Display Computer
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Media Equipment
Audio processing hardware, microphones, speakers, video cameras, etc.
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Matchmaker
Matchmaker matches semi-pro, industrial and consumer audio equipment into professional balanced systems:
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Projection Equipment
• Projectors and Screen
A minimum of three projectors is recommended to provide adequate display space for AG images with at least 1024x768 pixel resolution.
• WallTalkerLike a wallpaper used as a non-reflecting projector display screen. Using a special felt pen, a presenter can write on it and erase it like a white board.
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Bandwidth Considerations
• Peer-to-peer relationship; all users can stream to all other users.
• 10 Mb/sec will typically support a meeting with three AG nodes. Each additional participating AG node will consume roughly 2 Mb/sec of IP multicast bandwidth.
• Video codecs only send changes of the image. A room with little motion will have high-quality images on little bandwidth, while a room with many changes will consume more bandwidth and may have poorer quality.
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Connections
• A multicast enabled 100bT connection to the node hardware is required and at least DS3 bandwidth to the Internet from the node is recommended.
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Platforms
• The Access Grid Toolkit 2.1 supported platforms: • RedHat Linux, Microsoft Windows2000, XP, Mac
OS.• Personal node installation of Access Grid:
Personal Interface Grid (PIG) Toolkit 2.1 on Windows.
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Applications
• Distributed, collaborative college courses.• Guest lecturer in a course.• Collaborative students’ projects.• Distributed Network Modeling and Simulation.• Co–teaching a course.• Participating in Megaconferences (Universities and
organizations from throughout the country or other countries), etc.
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3. Other Projects
• End-to-end Performance Evaluation and Analysis
Measure and better understand the characteristics of the traffic generated by high-speed network applications.
• Quality of Service
The goal is to evaluate and measure the performance of various QoS solutions.
• Security
The research will focus on the security services that can be used on campuses.
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ITK High-speed Networking Lab
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References
[1] Robert S. Dixon, “Internet Videoconferencing; Coming to Your Campus Soon!”, Educause
Quarterly, Number 4, 2000
[2] http://e2epi.internet2.edu/
[3] http://www.accessgrid.org/
[4] http://www.internet2.edu
[5] http://www.vide.net