- Industry: Telecommunications
- Number of terms: 29235
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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.
In a programming language, an expression that specifies one operation and identifies its operands, if any.
Industry:Telecommunications
In a protocol data unit (PDU,) the field that (a) contains data interpreted by the receiving destination logical-link controller (LLC) and (b) may be the field immediately following the destination service access point (DSAP) and source service access point (SSAP) address fields of the PDU.
Industry:Telecommunications
In a public switched telephone network, a network-provided service feature that permits an attendant to verify the busy or idle state of station lines and to break into the conversation. Note: A 440-Hz tone is applied to the line for 2 seconds, followed by a 0. 5-second burst every 10 seconds, to alert both parties that the attendant is connected to the circuit.
Industry:Telecommunications
In a public switched telephone network, a network-provided service feature that permits an attendant to verify the busy or idle state of station lines and to break into the conversation. Note: A 440-Hz tone is applied to the line for 2 seconds, followed by a 0. 5-second burst every 10 seconds, to alert both parties that the attendant is connected to the circuit.
Industry:Telecommunications
In a pulse waveform, the interval between (a) the time, during the first transition, that the pulse amplitude reaches a specified fraction (level) of its final amplitude, and (b) the time the pulse amplitude drops, on the last transition, to the same level. Note: The interval between the 50% points of the final amplitude is usually used to determine or define pulse duration, and this is understood to be the case unless otherwise specified. Other fractions of the final amplitude, e.g., 90% or 1/e (where e = 2. 71828. . . ,) may also be used, as may the root-mean-square (rms) value of the pulse amplitude. Deprecated synonyms pulse length, pulse width. 2. In radar, measurement of pulse transmission time in microseconds, that is, the time the radar's transmitter is energized during each cycle.
Industry:Telecommunications
In a PVP (packetized voice protocol) node, an indication that the far-end PVP node is experiencing an alarm condition. This occurs because of either the loss of keep-alive signaling packets, or the receipt of signaling packets with the normal/alarm (N/A) bit set to 1.
Industry:Telecommunications
In a quantum mechanical system, the radiation emitted when the internal energy of the system drops from an excited level (induced by the presence of radiant energy at the same frequency) to a lower level. Note: An example of stimulated emission is the radiation from an injection laser diode operated above the lasing threshold.
Industry:Telecommunications
In a radio receiver, the generation of a reference carrier with a phase closely matching that of a received signal.
Industry:Telecommunications
In a raster-scanned imaging system, the smallest discrete scanning line sample that can contain gray scale information.
Industry:Telecommunications
In a reactive circuit, the ratio of the reactance in ohms divided by the resistance in ohms.
Industry:Telecommunications
