including the US's ANSI and its British equivalent, the British Standards Institution (BSI). ISO members include the national standards bodies of most industrialized countries. The ISO, in conjunction with the ITU-T, continues to develop video communications standards. Their joint efforts have produced the Joint Photographic Experts Group (JPEG) and the Motion Picture Experts Group (MPEG) family of encoding techniques. isochronous Channels that are capable of transmitting timing information in addition to the data itself, and which thereby allow the terminals at each end to maintain exact synchronization with each other (the term is Glossary of Terms pronounced 'I-SOCK-ron-us'). IsoENET An approach to providing isochronous service over Ethernet. It derives an additional 96 switched B channels from 10Base-T. National Semiconductor and IBM developed it. International Teleconferencing Association, a professional association organized to promote the use of teleconferencing (audio and video conferencing). Located in Washington D.C. ITFS Antenna System Instructional Television Fixed Service. A type of local distance learning system that provides one-way over- the-air television service at microwave frequencies. These frequencies are reserved for educational purposes. The signals can be received only by television installations equipped with a converter that changes the signals to NTSC. One of the specialized agencies of the United Nations, the International Telecommunications Union was founded in 1865, before telephones were invented, as a telegraphy standards body. ITU-R Formerly the United Nation's CCIR, the ITU-R sets international standards that relate to how the radio spectrum is allocated and utilized. ITU-T The International Telecommunications Union's Telecommunications Standardization Sector. The ITU-T (formerly the CCITT) is the telephony standards-setting arm of the ITU. The ITU-T developed the H.320, H.323 and H.324 protocol suites that define how videoconferencing codecs interoperate over various types of n