ITU-T Study Group 8, ITU-T Recommendation T.120 (Draft, March 1995): Data Protocols for Multimedia Conferencing.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....conference. The MP processes these media streams and returns them to the terminals either in point to point or in multicast mode, provided that the MCU and terminals are capable of communicating in multicast mode. The MP may perform video switching or mixing, audio mixing, T. 120 data distribution [5] and transcoding between different audio, video and data formats and bit rates in order to support conferences between H.323 terminals with different communication modes. 2.2.2 Types of multipoint conferences The H.323 standard supports three types of multipoint conferences: centralized, ....

ITU-T Rec. T.120 "Data protocols for multimedia conferencing", 1996

....computer. It further differs in the degree of interactivity between lecture participants; private chat sessions between virtual desk neighbors are not provided (see Section 3.8) 10 4.3 ITU Recommendation T.120 Data Protocols for Multimedia Conferencing The ITU T. 120 family of protocols [12] is designed to be used as basis for multimedia conferencing over public switched telephone networks. Similar to our approach, the ITUT. 120 family provides a centralized moderating functionality. In contrast to our interaction control architecture, the ITU T.120 family of protocols requires ....

ITU Recommendation T.120: Data Protocols for Multimedia Conferencing, 1996

....any form of standardisation that will allow interoperability among systems. In addition, there is a lack of a proper framework to allow the evaluation or comparison between systems to take place. Although there appears to be some development in the area of standardisation with the H. 323 standard (ITU, 1996a) and T.120 standard (ITU, 1996b) gaining some momentum and acceptance, an evaluation framework for these systems remains lacking today. Currently, it is left to each new system claiming its superiority over others in some manner in its sales literature or user documentation. Alternatively, there ....

....will allow interoperability among systems. In addition, there is a lack of a proper framework to allow the evaluation or comparison between systems to take place. Although there appears to be some development in the area of standardisation with the H.323 standard (ITU, 1996a) and T. 120 standard (ITU, 1996b) gaining some momentum and acceptance, an evaluation framework for these systems remains lacking today. Currently, it is left to each new system claiming its superiority over others in some manner in its sales literature or user documentation. Alternatively, there exists a small number of ....

ITU: International Telecommunication Union, ITU-T Series T Recommendations: T.120 Data protocols for multimedia conferencing, <URL: http://www.itu.ch/publications/itu-t/ituth.htm>, 1996.

....software apart from the fact that one common software is not always available for different platforms. For instance, some proprietary multimedia conferencing systems are available that do not use the new T. 120 standard of the International Telecommunications Union Telecommunication (ITU T) [6]. The drawbacks of this standard and of proprietary systems for Audiographic Teleconferencing include price and the difficult installation. On the datacommunication side the Multicast Backbone (MBone) 1] realizes a virtual network providing a multicasting facility over the Internet. Unfortunately ....

ITU Draft Recommendation T.120, "Data Protocols for Multimedia Conferencing", November 1995

....[16] and reduces the computation requirement on the Event Channel server, contributing for the increase of system availability. With these refinements, we intend to provide high scalability and performance to the developed conferencing system prototype, maintaining compatibility with ITU T. 120 [17] recommendations. Figure 5 shows the considered object model and its relationships, in Unified Modelling Language (UML) The conference structure is initiated by the Node object. This object has the responsibility for creating the Generic Controller and the ChatApplication and the ....

ITU-T Study Group 8, ITU-T Recommendation T.120 (Draft, March 1995): Data Protocols for Multimedia Conferencing.

....Force (IETF) Typically, a loosely coupled conference consists of multipoint sessions with audio and video streams, supported by RTP and RTCP protocols, using IP Multicasting, as it is the case of Mbone [3] in the Internet community. ITU defined two standards for tightly coupled conferences: T. 120 [4 12] recommendations for data conferences and H.323 recommendations [13] for multimedia conferences. The increasing interest in more formal conferences lead IETF to the development (still as work in progress) of a tightly coupled model SCCP, Simple Conference Control Protocol [14] with ....

ITU-T Study Group 8, ITU-T Recommendation T.120 (Draft, March 1995): Data Protocols for Multimedia Conferencing.

....Force (IETF) Typically, a loosely coupled conference consists of multipoint sessions with audio and video streams, supported by RTP and RTCP protocols, using IP Multicasting, as it is the case of MBone [3] in the Internet community. ITU defined two standards for tightly coupled conferences: T. 120 [4 12] recommendations for data conferences and H.323 recommendations [13] for multimedia conferences. The increasing interest in more formal conferences lead IETF to the development (still as work in progress) of a tightly coupled model SCCP, Simple Conference Control Protocol [14] with ....

ITU-T Study Group 8, ITU-T Recommendation T.120 (Draft, March 1995): Data Protocols for Multimedia Conferencing.

....Force (IETF) Typically, a loosely coupled conference consists of multipoint sessions with audio and video streams, supported by RTP and RTCP protocols, using IP Multicasting, as it is the case of Mbone [1] in the Internet community. ITU defined two standards for tightly coupled conferences: T. 120 [2 10] recommendations for data conferences and H.323 recommendations [11] for multimedia conferences. The increasing interest in more formal conferences lead IETF to the development (still as work in progress) of a tightly coupled model SCCP, Simple Conference Control Protocol [12] with ....

ITU-T Study Group 8, ITU-T Recommendation T.120 (Draft, March 1995): Data Protocols for Multimedia Conferencing.

....the service architecture, and the use of LRMP [7] The proposals addressed in this paper were developed and validated in a prototype environment named CONCHA CONference system based on java and corba event service CHAnnels) 8] which is a conference system based on ITU T. 120 recommendations [9], with reliable multicast communication for both data and control information. In addition to validation in the CONCHA environment, the proposed extensions to the CORBA Event Service were analysed in terms of throughput. The corresponding results are presented at the section 3. Section 4 presents ....

....based on java and corba event service CHAnnels) 8] that is a Java conference system, with a control service based on the CORBA Event Service, developed at the Communications and Telematic Services Group of the University of Coimbra. The conference system is based on ITU T. 120 recommendations [9], with reliable multicasting communication for both data and control information. As the conference scalability is directly related to resource request response times, the servers must speed up the resource response process by placing the answers in a reliable multicasting communication channel ....

ITU-T Study Group 8, ITU-T Recommendation T.120 (Draft, March 1995): Data Protocols for Multimedia Conferencing.

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