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Understanding H.323 Technology for Video Conferencing: An Overview

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hunter
17 diapositives · 322 Views · Sep 16, 2014

This document provides an in-depth exploration of H.323 technology as it pertains to video conferencing and broadcasting. Dr. Bob Dixon, Chief Research Engineer at OARNet and Ohio State University, details the differences between video conferencing—akin to a two-way telephone call—and video broadcasting, similar to watching television. The document discusses the technical requirements for effective video conferencing, including hardware, software, and network conditions, and examines the role of components like Gatekeepers, Gateways, and MCUs in managing video communication.

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  1. H.323 Technology Dr Bob Dixon Chief Research Engineer OARNet and Ohio State University Internet2 Commons Site Coordinator Training March 31, 2005 Atlanta, Georgia

  2. Video Conferencing vs. Video Broadcasting Video Conferencing Like a telephone call Two - Way Call up or Answer Video Broadcasting Like watching Television One - Way Tune In or enter URL Streaming Webcasting

  3. InternetUnicastVideo Broadcasting Minnesota New York Internet Colorado Ohio

  4. Internet Multicast Video Broadcasting Minnesota New York Internet Colorado Ohio

  5. Minnesota New York Internet Colorado Ohio Internet Point-to-Point Videoconferencing

  6. Minnesota New York Colorado Ohio Internet Multipoint Videoconferencing Internet MCU

  7. Use in special room; rare Use anywhere; ubiquitous Uses ISDN telephone lines Uses Internet High installation cost Low installation cost High usage cost No usage cost Scheduled in advance Impromptu Do-it-yourself Professional operator Centralized control Decentralized control Two Types of Video Conferencing TraditionalInternet Usage at plateau Usage growing rapidly H.320 standard H.323 standard

  8. Requirements Good Quality DESKTOP Internet Videoconferencing 1. Fast PC. 500 MHz minimum. 1 GHz best. 2. Good quality video conferencing equipment. Forget “web cameras”. Forget software like Netmeeting. 3. GOOD Internet connection. Most large university networks are good. Forget 56K modem dial-in. Cable modems and DSL are possible.

  9. Video Conferencing Products 1. Software-based Generally slow and non-standard; not very satisfactory. Examples: Microsoft NetMeeting, White Pine CUSeeMe. 2. Hardware-based, plug into PC USB Port. Newest approach; will become ubiquitous Examples: Polycom ViaVideo, VCON ViGo. 3. Hardware-based, standalone appliance, no PC involved. Easiest to use, best quality. Example: Polycom Viewstation

  10. Typical Equipment Desktop and Laptop: Polycom ViaVideo - cost $400 Also requires PC Classroom and conference room: Polycom Viewstation - model VSX-7000 - Cost $5000 Also requires TV monitor or projector

  11. Gatekeeper Gateway H.323 Video Components PC Client Appliance Internet Multipoint Control Unit Remote H.320 Video Rooms ISDN Telephone Lines

  12. Multipoint Control Unit (MCU) 1. Allows more than two people to be in a video conference. 2. May be physically located anywhere on Earth. 3. Functions as an Internet server for video conferencing. 4. Every person’s audio is always heard by all others. 5. Video from the person who talks loudest is seen by all. 6. Various brands have various capacities and features. 7. Multiple MCUs may be cascaded together for larger video conferences. Or used separately for more simultaneous video conferences.

  13. Gateway (GW) 1. Joins H.320 ISDN video calls with H.323 Internet video calls. 2. Calls may be initiated from either side. 3. May be physically located anywhere on Earth. 4. Various brands have various capacities and features. 5. Multiple gateways may be used for more simultaneous calls.

  14. Gatekeeper (GK) 1. Controls all MCUs, gateways, and clients in its “zone”. A zone is any collection of H.323 devices you choose to work closely together. The devices may be physically located anywhere on Earth. 2. All H.323 devices must “register” with a gatekeeper, before they can do very much. 3. There can be only one active gatekeeper in a zone. 4. May be physically located anywhere on Earth. 5. May be physically located in an MCU, a gateway, a router, or a PC. But it is independent of them. 6. Multiple gatekeepers may be “neighbors” of each other, in different zones.

  15. Gatekeeper (GK) (contined) 7. Provides calling with “telephone numbers” and nicknames, instead of IP addresses. A gatekeeper is analogous to a domain name server, in this sense. 8. Provides optional control of what each user can do: bandwidth and speed limits access to gateways and MCUs 9. Note that calls DO NOT go THROUGH a Gatekeeper.

  16. MCU GateKeeper H.323 Real Video Web Browser H.323 Videoconferencing H.320 Telephone ISDN POTS line Gateway INTERNET H.323 Clients

  17. Useful References 1. Educause Quarterly tutorial article www.educause.edu/pub/eq/eqm00/eqm004.html 2. The Video Conferencing Cookbook, and other materials at http://vide.utk.edu 3. The Megaconference http://www.megaconference.org