Sec.  15.303   Definitions.

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

   (b)  Coordinatable  PCS device. PCS devices whose geographical area of
   operation is sufficiently controlled either by necessity of operation with a
   fixed  infrastructure  or  by  disabling  mechanisms to allow adequate
   coordination  of their locations relative to incumbent fixed microwave
   facilities.

   (c) 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.

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

   (e) Noncoordinatable PCS device. A PCS device that is capable of randomly
   roaming and operating in geographic areas containing incumbent microwave
   facilities such that operation of the PCS device will potentially cause
   harmful interference to the incumbent microwave facilities.

   (f) 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.

   (g) 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.

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

   (i) Sub-band. For purposes of this subpart the term sub-band refers to the
   spectrum allocated for isochronous or asynchronous transmission.

   (j) 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.

   (k) 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]