Multimedia Service Requirements Recommendation F.701 provides guidelines for describing user requirements that are to be used as the basis for constructing new multimedia services. These guidelines are primarily intended to support the Multimedia service development methodology described in ITU-T Recommendation F.700. However, they can also be used as the basis for a structured dialogue between […]
Videotelephony Teleservice for ISDN The videotelephony teleservice for ISDN is a symmetrical, bi-directional, real-time, audiovisual teleservice in which speech and moving pictures are interchanged by means of one or two B-channels, using 64 kbit/s circuit-mode connections in the ISDN. The picture information transmitted is sufficient for adequate representation of fluid movements of a person displayed […]
IP videotelephony service The IP videotelephony service provides real-time end-to-end bidirectional communications between two subscribers in different locations on the IP network by means of voice, video, real-time text and other forms of multimedia data and/or control facility. The way to place a call on IP videotelephony services is the same as that for conventional […]
Videophone Service in Public Switched Telephone Network (PSTN) Introduction Recommendation F.723 contains the description and network specific service requirements for videophone service in Public Switched Telephone Network (PSTN). The substance of this Recommendation complements the main body of the Supplement to Recommendation F.720, which deals with network independent service requirements for respective Low Bit Rate […]
Multimedia Conference Services The multimedia conference services provide real-time transmission of voice together with motion video and/or various types of multimedia information between groups of users in two or more locations. The documents exchanged may contain all information types. When moving pictures are present, their quality must be at least sufficient for the adequate representation […]
Jitter Components The recent improvement to semiconductor device performance has seen bit rates of 28 Gbps become commonplace. When using high-speed signals like the 28 Gbps band, the impact of jitter components from various sources in the surrounding environment on the transmission quality cannot be ignored. As a result, accurate evaluation of device characteristics requires testing by injecting multiple types of jitter on the […]
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