- 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.
The amount by which a frequency differs from a prescribed value, such as the amount an oscillator frequency drifts from its nominal frequency. 2. In frequency modulation, the absolute difference between (a) the maximum permissible instantaneous frequency of the modulated wave or the minimum permissible instantaneous frequency of the modulated wave and (b) the carrier frequency. 3. In frequency modulation, the maximum absolute difference, during a specified period, between the instantaneous frequency of the modulated wave and the carrier frequency.
Industry:Telecommunications
The altitude of the apogee or perigee above a specified reference surface serving to represent the surface of the Earth. Note: In technical usage, the definite article is not used with the term apogee or perigee alone. A body orbiting the Earth is said simply to be "at apogee" or "at perigee. "It may, however, properly be said to be "at the point of apogee" or "at the point of perigee. "
Industry:Telecommunications
The allocation, within a system, of available electrical power, among the various functions that need to be performed. Note: An example of a power budget in a communications satellite is the allocation of available power among various functions, such as maintaining satellite orientation, maintaining orbital control, performing signal reception, and performing signal retransmission. Synonym system budget.
Industry:Telecommunications
The alignment that exists when flags are received at intervals that correspond to integral numbers of octets and that fall within certain upper and lower limits.
Industry:Telecommunications
The allocation of circuits between two points over more than one geographic or physical route with no geographic points in common.
Industry:Telecommunications
The aggregate rate at which data pass a point in the transmission path of a data transmission system. Note 1: The DSR is usually expressed in bits per second. Note 2: The data signaling rate is given by where m is the number of parallel channels, ni is the number of significant conditions of the modulation in the I-th channel, and Ti is the unit interval, expressed in seconds, for the I-th channel. Note 3: For serial transmission in a single channel, the DSR reduces to (1/T) log2n; with a two-condition modulation, i.e., n=2, the DSR is 1/T. Note 4: For parallel transmission with equal unit intervals and equal numbers of significant conditions on each channel, the DSR is (m/T) log2n; in the case of a two-condition modulation, this reduces to m/T. Note 5: The DSR may be expressed in bauds, in which case, the factor log2ni in the above summation formula should be deleted when calculating bauds. Note 6: In synchronous binary signaling, the DSR in bits per second may be numerically the same as the modulation rate expressed in bauds. Signal processors, such as four-phase modems, cannot change the DSR, but the modulation rate depends on the line modulation scheme, in accordance with Note 4. For example, in a 2400 b/s 4-phase sending modem, the signaling rate is 2400 b/s on the serial input side, but the modulation rate is only 1200 bauds on the 4-phase output side.
Industry:Telecommunications
The aggregate of equipment, such as radios, telephones, teletypewriters, facsimile equipment, data equipment, cables, and switches, used for providing telecommunications services.
Industry:Telecommunications
The AECS Plan provides for the operation of aeronautical communications stations, on a voluntary, organized basis, to provide the President and the Federal Government, as well as heads of state and local governments, or their designated representatives, and the aeronautical industry with an expeditious means of communications during an emergency situation.
Industry:Telecommunications
The adjustment of transmission levels of single links and of links in tandem to prevent problems such as overloading of transmission subsystems.
Industry:Telecommunications
The address assigned to the initial storage location of a computer program in main storage.
Industry:Telecommunications
