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 bands 1910-1930 MHz and 
2390-2400 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

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watts, K is Boltzmann's constant, T is the absolute temperature in 
degrees Kelvin (e.g., 295  deg.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]