wp-video-h_323 - H.323 is the ITU standard for conferencing...

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1 H.323 is the ITU standard for conferencing which covers Voice, Video and data conferencing. The applications that conforms to H.323 are VoIP(Voice over IP), White boarding(or Data conferencing), and Video conferencing. This paper describes the evolution of the videoconferencing, and the usage of conferencing and how it is becoming one of the desktop multimedia applications that is being deployed rapidly. The rapid deployment of desktop conferencing has an impact on the network infrastructure. This paper provides introduction to the technology and H.323 recommendation which standardizes the desktop videoconferencing, Cisco’s positioning on this emerging technology, and how Cisco products can help deploy H.323 applications. 1. Introduction: Corporations have been using room-based video conferencing solutions since 1980’s. These first generation video conferencing solutions were based H.320, an ITU standard which defines circuit-switched (ISDN) connection based video conferencing. In the late 80’s, second generation video conferencing solutions, the first desktop based video conferencing units started emerging. However, these systems still dependent on H.320 and an ISDN connection to the desktop. The very high cost of these units, combined with the difficulties and cost of getting an ISDN connection in those days kept the number of systems deployed to a small number. In the mid 90’s, third generation video conferencing solutions based on local area networks (LAN) based desktop systems started becoming available. These solutions were based on proprietary technology and did not interoperate between different vendor’s solutions. In addition, these solutions required a very predictable small workgroup LAN to deliver business quality video conferencing. These reasons and the still relatively high cost of desktop video conferencing solutions made it difficult, if not prohibitive, for corporations to adopt desktop video conferencing. A major breakthrough happened when Personal Conferencing Work Group (PCWG) driven by Intel merged with the conferencing special interest groups of ITU, mainly led by PictureTel, to create a new standards for video conferencing. Two standards of importance are H.323 and H.324. The H.323 specification, approved by ITU in June, 1996 defines LAN based video conferencing standard and enables interoperability between different vendors implementations. The H.324 standard defines plain old telephone system (POTS) based video conferencing. Successful mass deployment and adoption of networked multimedia will require communications infrastructures (most notably computer and telephone networks) to support end-to-end standards-based networked multimedia technologies as seamlessly as possible. Standards-based video conferencing is generally governed by the International Telecommunications Union (ITU) “H-series” recommendations which include: H.320 (ISDN protocol), H.323 (LAN protocol), and H.324 (POTs protocol). These standards specify the manner in which real-time audio, video, and data communications takes place over various communications topologies. Standards compliance promotes common
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wp-video-h_323 - H.323 is the ITU standard for conferencing...

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