|The Federal Communications Commission (FCC) is the authority
in the United States of America that creates and enforces the use of airwaves throughout the entire
radio frequency spectrum. This group of documents contains the entirety of the
FCC Part 15 regulations
that concern unlicensed radio frequency devices. As with all government documents, this material
is in the public domain and may be freely copied so long as the content is not changed. This copy
is provided as a convenience for RF Cafe visitors.
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Table of Contents.
[Code of Federal Regulations]
[Title 47, Volume 1]
[Revised as of October 1, 2008]
From the U.S. Government Printing Office via GPO Access
CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
Subpart D_Unlicensed Personal Communications Service Devices
Sec. 15.303 Definitions.
(a) Asynchronous devices. Devices that transmit RF energy at
irregular time intervals, as typified by local area network data
(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
(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
(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
[deg]K) and B is the emission bandwidth of the device in hertz.
(k) Time window. An interval of time in which transmission is
[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.