Videoconferencing System. The Cong Giang EAP IT Manager

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1 Videoconferencing System The Cong Giang EAP IT Manager

2 Participants What do you know about Videoconferencing? What is Videoconferencing? What are basic equipments? Frame rate (VC, TV broadcast and Film)? GDLN frame rate?

3 What is Videoconferencing? A technology that allows Two or more people at different locations to see and hear each other at the same time Also to share computer applications such as Internet pages, library catalogs, documents, or software Normal videoconference frame rate varies from 5-30/sec while regular TV broadcast is about 30 frames/sec, film with 24 frames/sec.

4 Types of VC Since 1995 VC has started taking off. Initially Two basic units: TV and BOX+camera Difficult to operate and connect. High cost of ISDN Not all systems were compatible

5 VC Capabilities A complete VC System provides two-way (send and receive) communications using the following media: Video: inputs from: TV camera, document camera, Cable TV, VCR, Streaming Video; outputs to: TV monitor, color projector, PC monitor) Voice inputs from: microphone, VCR; outputs to: speakers, headphone and interpretation Data: inputs from: keyboard, PC hard drives, network; outputs to: PC monitor, printer, local/network hard drives Telematics inputs from: keyboard commands; outputs to: remote camera control, etc.

6 VC - Interconnection The Videoconferencing Systems can interconnect with each other in a number of modes such as: Point-to-point Multipoint Broadcast.

7 Distance Learning Requirements To fully satisfy all the Distance Learning requirements, the following components should be added to sites with the Videoconferencing Systems: Additional system for on-line data interactions (between the teacher and students) Facsimile Overlay Teleconferencing System (based on the multipoint telephone sessions) Networked computer classroom. Interpretation System

8 Basic Videoconferencing Technology audio-visual equipment (monitor, camera, microphone, and speaker) a means of transmitting information between sites Cost of these two methods of transmissions: a broadband satellite connection with studio-quality equipment produces an excellent full-motion video connection and Advances in ICT have sparked an interest in compressed video systems which transmit information via the Internet using Internet Protocols (IP) and digital telephone networks such as ISDN.

9 The Distance Learning Requirements The technology support must provide the concurrent interactions such as: Voice interactions (student or teacher originated, with the Help Desk, with the Technical Support) Data interactions (on-line: questions and answers, polling, test, print file, fax; off-line: , database search) Video interactions (two-way live video, two-way still (document) images, two-way PC graphics, one-way streaming video).

10 Participants: What types of VC are?

11 VC - Three Types Portable Units Desktop Intergrated System

12 Portable Units All of the equipment is loaded onto a rolling cart and moved to whichever location needs it. Convenient. (WB COs) To add more equipment becomes problematic Require more setups and testing Good for informal and formal meetings

13 Desktop VC Because of advances in technology, fast ethernet as a cheap delivery media IP-based desktop systems: a PC, an inexpensive camera, a microphone, a speaker, software Sharing: See and edit file on the screen Low cost and suitable for informal communications

14 Intergrated System Classroom style: equipment are integrated and physically fixed into the classroom design. Multiple monitors/large screens Multiple microphones Lecturer presents to participants (attending both locally and remotely) Interpretation equipment Good for formal comminications

15 Connections Significant distinction among VCs: How data is transmitted Before: Systems were proprietary each has its own standard Now: Most systems are standards-based: They can connect with any equipment using the same standard

16 Three Standards H.320 (ISDN): The ITU-T standard for integrating voice, digitized video, data and control messages in the same session established through the Public ISDN and/or set of dedicated links in any Private Network.

17 Three Standards (cont.) H.323 (IP): Similar to H.320 but intended for connections based on the Internet Protocol (IP). A new standard, H.350: A relatively new video compression standard developed by the Internet2 Middleware Initiative Video Working Group

18 WB VC Conference Network

19 Additional connection considerations Gateways allow different conferencing protocols to connect to each other by receiving and translating data A gatekeeper is special sofware that runs on a computer or dedicated server and manages the activities of multiple conferences. An MCU (multipoint control unit) enables multiple sites to participate in a videoconference

20 MCU To interconnect three or more systems while using such a mixture of media, we need a special computerized device called the Multipoint Conference Unit (MCU).

21 Questions Q1: Types of VC systems EAP GLDN Q2: Types of VC systems in WB COs Q3: Connection standards in EAP GDLN Co-Located Stand-alone Speed

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