- 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.
At a given frequency, the loss that results when an impedance is connected across a transmission line. Note: Bridging loss is expressed as the ratio, in dB, of the signal power delivered, prior to bridging, to a given point in a system downstream from the bridging point, to the signal power delivered to the given point after bridging.
Industry:Telecommunications
At a given frequency, the ratio of the power radiated to the total power supplied to the radiator.
Industry:Telecommunications
At a given signaling point, the process that decides, for each incoming message, whether the signaling point is destination point or if it should act as signaling transfer point for that message, and accordingly, whether the message should be handed to (signaling) message distribution or to (signaling) message routing functions.
Industry:Telecommunications
At a minimum, the calling line identification includes a single calling party number; it may also include a second calling party number, a calling party subaddress, and redirecting number information. Calling line identification may not include any calling party number due to interworking, or because of an interaction with the CLIR supplementary service.
Industry:Telecommunications
At a pair of terminals, the temperature of a passive system having an available noise power per unit bandwidth at a specified frequency equal to that of the actual terminals of a network. Note: The noise temperature of a simple resistor is the actual temperature of that resistor. The noise temperature of a diode may be many times the actual temperature of the diode.
Industry:Telecommunications
At a point in an electromagnetic wave, the ratio of the electric field strength to the magnetic field strength. Note 1: If the electric field strength is expressed in volts per meter and the magnetic field strength is expressed in ampere-turns per meter, the wave impedance will have the units of ohms. The wave impedance, Z, of an electromagnetic wave is given by where is the magnetic permeability and is the electric permittivity. For free space, these values are 4 × 10-7 H/m (henries per meter) and (1/36) F/m (farads per meter,) from which 120, i.e., 377, ohms is obtained. In dielectric materials, the wave impedance is 377/n, where n is the refractive index. Note 2: Although the ratio is called the wave impedance, it is also the impedance of the free space or the material medium.
Industry:Telecommunications
At a specified point in a circuit, the ratio of the power of the wanted signal to the power of the unwanted signal from another channel. Note 1: The signals are adjusted in each channel so that they are of equal power at the zero transmission level point in their respective channels. Note 2: The signal-to-crosstalk ratio is usually expressed in dB.
Industry:Telecommunications
At a specified point in a telecommunications system, the power that is measured when a standard test signal, e.g., 0 dBm or -16 dBm at 1000 Hz, is transmitted from a corresponding reference point. Note: The transmission level is usually expressed in dBm.
Industry:Telecommunications
At any point in a frequency-shift facsimile system, the numerical difference between the frequency that corresponds to a white signal and the frequency that corresponds to a black signal. Note: Facsimile frequency shift is usually expressed in hertz.
Industry:Telecommunications
At any point in a transmission system, the ratio of the circuit noise at that point to an arbitrary level chosen as a reference. Note: The circuit noise level is usually expressed in dBrn0, signifying the reading of a circuit noise meter, or in dBa0, signifying circuit noise meter reading adjusted to represent an interfering effect under specified conditions.
Industry:Telecommunications
