§  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]