Audioconferencing--Teleconferencing method used mostly by audio communications channels such as telephone lines provided by a telecommunications company interconnecting the various parties.
Bandwidth--(1) A range of frequencies between two defined limits expressed in cycles per second, or hertz (Hz). It is also the information carrying capacity of a circuit. (2) The expression of the carrying capacity of the transmission line. In a digital transmission, the bandwidth is the range of transmission rates at which information can be sent in a particular medium. The bandwidth is expressed in kilobits per seconds or megabits per second (Mbps). (3) The capacity of a transmission channel.
Bridge--Device for the interconnection of telecon-ferencing systems and communications lines in a multipoint session. A bridge is called an audio bridge in audio-conferencing and a multipoint control unit in videoconferencing. The bridge can be an analog or a digital device. An essential component of an audio-conferencing system, the bridge also balances the signal levels of the audio transmission, reduces noise, and minimizes echo.
Circuit--A physical, metallic path used for two-way communications between two or more points.
Codec--A videoconferencing system component that processes incoming and outgoing audiovisual signals in terms of coding and compression.
Coding or Compression--A technique used to reduce the amount of space taken up by data during transmission.
Digital--The transmission of discontinuous signals in which information is encoded in binary form.
Document Conferencing--A conferencing technology that enables customers to review a document and collaborate with others, right from their computer using either analog and modem dial-up or existing Internet accesses (LAN, dial-up, etc.)
ISDN (Integrated Services Digital Network)--An international standard developed for transmitting voice, data, and video simultaneously over digital lines. These lines run at 64 kilobits per second.
ITU--International Telecommunication Union (telecommunications standards division).
JPEG--Joint Photographic Experts Group.
Kbps--Kilobits per second.
LAN--Local area network.
Mbps--Megabits per second.
MCU--Multipoint control unit.
Multipoint--The connection of more than two locations to affect a teleconference, as opposed to only point-to-point connections.
PBX (Private Branch Exchange)--A private phone system existing within an organization that allows communication within the organization by dialing an extension and outside the organization by dialing "9" and then the number.
PSTN--Public Switched Telephone Network
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