§ 15.303   Definitions.

   Asynchronous devices. Devices that transmit RF energy at irregular time
   intervals, as typified by local area network data systems.

   Emission bandwidth. For purposes of this subpart the emission bandwidth
   shall be determined by measuring the width of the signal between two points,
   one below the carrier center frequency and one above the carrier center
   frequency,  that  are  26 dB down relative to the maximum level of the
   modulated carrier. Compliance with the emissions limits is based on the use
   of measurement instrumentation employing a peak detector function with an
   instrument resolutions bandwidth approximately equal to 1.0 percent of the
   emission bandwidth of the device under measurement.

   Isochronous devices. Devices that transmit at a regular interval, typified
   by time-division voice systems.

   Peak transmit power. The peak power output as measured over an interval of
   time equal to the frame rate or transmission burst of the device under all
   conditions of modulation. Usually this parameter is measured as a conducted
   emission  by  direct connection of a calibrated test instrument to the
   equipment  under  test.  If  the  device cannot be connected directly,
   alternative techniques acceptable to the Commission may be used.

   Personal Communications Services (PCS) Devices [Unlicensed]. Intentional
   radiators operating in the frequency band 1920-1930 MHz that provide a wide
   array of mobile and ancillary fixed communication services to individuals
   and businesses.

   Spectrum  window. An amount of spectrum equal to the intended emission
   bandwidth in which operation is desired.

   Thermal noise power. The noise power in watts defined by the formula N = kTB
   where N is the noise power in watts, K is Boltzmann's constant, T is the
   absolute temperature in degrees Kelvin (e.g., 295 °K) and B is the emission
   bandwidth of the device in hertz.

   Time window. An interval of time in which transmission is desired.

   [ 58 FR 59180 , Nov. 8, 1993, as amended at  59 FR 32852 , June 24, 1994;  60 FR 13073 , Mar. 10, 1995;  69 FR 62620 , Oct. 27, 2004;  69 FR 77949 , Dec. 29,
   2004;  77 FR 43013 , July 23, 2012]

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