- Industry: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
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ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
The transfer of signals occupying a specified frequency band, such as a channel or group of channels, from one portion of the frequency spectrum to another, in such a way that the arithmetic frequency difference of signals within the band is unaltered.
Industry:Telecommunications
The window of an optical fiber at which material dispersion is very small. Note 1: In silica-based fibers, the minimum-dispersion window occurs at a wavelength of approximately 1. 3 m. Note 2: The minimum-dispersion window may be shifted toward the minimum-loss window, i.e., 1. 55 m, by the addition of dopants during manufacture. 2. In a single-mode fiber, the window or, in the case of doubly or quadruply clad fibers, windows, at which material and waveguide dispersion cancel one another, resulting in extremely wide bandwidth, i.e., extremely low dispersion, over a very narrow range of wavelengths. Synonym zero dispersion window.
Industry:Telecommunications
The time required for a radar pulse to travel 1 mile (~1. 6 km) to an object, i.e., to a target; reflect; and return to the receiver. Note: A radar statute mile is approximately 10. 8 s (microseconds); a radar nautical mile is approximately 12. 4 s. The time for any other radar unit distance is readily determined, such as the radar meter or the radar kilometer.
Industry:Telecommunications
The total power requirements of the integrated station facilities.
Industry:Telecommunications
The specific physical, i.e., real, or logical, i.e., virtual, arrangement of the elements of a network. Note 1: Two networks have the same topology if the connection configuration is the same, although the networks may differ in physical interconnections, distances between nodes, transmission rates, and/or signal types. Note 2: The common types of network topology are illustrated and defined in alphabetical order below: bus topology: A network topology in which all nodes, i.e., stations, are connected together by a single bus. Fully connected topology: A network topology in which there is a direct path (yybranch) between any two nodes. Note: In a fully connected network with n nodes, there are n (n-1) /2 direct paths, i.e., branches. Synonym fully connected mesh network. Hybrid topology: A combination of any two or more network topologies. Note 1: Instances can occur where two basic network topologies, when connected together, can still retain the basic network character, and therefore not be a hybrid network. For example, a tree network connected to a tree network is still a tree network. Therefore, a hybrid network accrues only when two basic networks are connected and the resulting network topology fails to meet one of the basic topology definitions. For example, two star networks connected together exhibit hybrid network topologies. Note 2: A hybrid topology always accrues when two different basic network topologies are connected. Linear topology: See bus topology. Mesh topology: A network topology in which there are at least two nodes with two or more paths between them. Ring topology: A network topology in which every node has exactly two branches connected to it. Star topology: A network topology in which peripheral nodes are connected to a central node, which rebroadcasts all transmissions received from any peripheral node to all peripheral nodes on the network, including the originating node. Note 1: All peripheral nodes may thus communicate with all others by transmitting to, and receiving from, the central node only. Note 2: The failure of a transmission line, i.e., channel, linking any peripheral node to the central node will result in the isolation of that peripheral node from all others. Note 3: If the star central node is passive, the originating node must be able to tolerate the reception of an echo of its own transmission, delayed by the two-way transmission time, i.e., to and from the central node, plus any delay generated in the central node. An active star network has an active central node that usually has the means to prevent echo-related problems. Tree topology: A network topology that, from a purely topologic viewpoint, resembles an interconnection of star networks in that individual peripheral nodes are required to transmit to and receive from one other node only, toward a central node, and are not required to act as repeaters or regenerators. Note 1: The function of the central node may be distributed. Note 2: As in the conventional star network, individual nodes may thus still be isolated from the network by a single-point failure of a transmission path to the node. Note 3: A single-point failure of a transmission path within a distributed node will result in partitioning two or more stations from the rest of the network.
Industry:Telecommunications
To translate a computer program expressed in a high-level language into a program expressed in a lower level language, such as an intermediate language, assembly language, or a machine language. 2. To prepare a machine language program from a computer program written in another programming language by making use of the overall logic structure of the program or by generating more than one computer instruction for each symbolic statement as well as performing the function of an assembler.
Industry:Telecommunications
Two or more networks connected for purposes of call processing.
Industry:Telecommunications
Under the terms of the Modification of Final Judgment (MFJ,) a geographical area within which a divested Bell Operating Company (BOC) is permitted to offer exchange telecommunications and exchange access services. Note: Under the terms of the MFJ, the BOCs are generally prohibited from providing services that originate in one LATA and terminate in another.
Industry:Telecommunications
The state of a service when (a) a network failure impairs or prevents the initiation of new requests for the service, (b) continued use of the service is impaired or not possible, or (c) certain service parameters fall outside prescribed limits.
Industry:Telecommunications
Transmitted video or audio data that are viewed (or listened to) in real time, i.e., as the information is received. Streaming media may be user-controlled (as in on-demand, pay-per-view movies) or server-controlled (as in Webcasting. )
Industry:Telecommunications
