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FCC Part 15 Radio Frequency Devices
Section 15.407

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. 

Click here for the 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
[CITE: 47CFR15.407]
[Page 836-839]
 
                       TITLE 47--TELECOMMUNICATION
 
              CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
 
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
 
    Subpart E_Unlicensed National Information Infrastructure Devices
 
Sec. 15.407  General technical requirements.
    (a) Power limits:
    (1) For the band 5.15-5.25 GHz, the maximum conducted output power 
over the frequency band of operation shall
[[Page 837]]
not exceed the lesser of 50 mW or 4 dBm + 10 log B, where B is the 26-dB 
emission bandwidth in MHz. In addition, the peak power spectral density 
shall not exceed 4 dBm in any 1-MHz band. If transmitting antennas of 
directional gain greater than 6 dBi are used, both the maximum conducted 
output power and the peak power spectral density shall be reduced by the 
amount in dB that the directional gain of the antenna exceeds 6 dBi.
    (2) For the 5.25-5.35 GHz and 5.47-5.725 GHz bands, the maximum 
conducted output power over the frequency bands of operation shall not 
exceed the lesser of 250 mW or 11 dBm + 10 log B, where B is the 26 dB 
emission bandwidth in megahertz. In addition, the peak power spectral 
density shall not exceed 11 dBm in any 1 megahertz band. If transmitting 
antennas of directional gain greater than 6 dBi are used, both the 
maximum conducted output power and the peak power spectral density shall 
be reduced by the amount in dB that the directional gain of the antenna 
exceeds 6 dBi.
    (3) For the band 5.725-5.825 GHz, the maximum conducted output power 
over the frequency band of operation shall not exceed the lesser of 1 W 
or 17 dBm + 10 log B, where B is the 26-dB emission bandwidth in MHz. In 
addition, the peak power spectral density shall not exceed 17 dBm in any 
1-MHz band. If transmitting antennas of directional gain greater than 6 
dBi are used, both the maximum conducted output power and the peak power 
spectral density shall be reduced by the amount in dB that the 
directional gain of the antenna exceeds 6 dBi. However, fixed point-to-
point U-NII devices operating in this band may employ transmitting 
antennas with directional gain up to 23 dBi without any corresponding 
reduction in the transmitter peak output power or peak power spectral 
density. For fixed, point-to-point U-NII transmitters that employ a 
directional antenna gain greater than 23 dBi, a 1 dB reduction in peak 
transmitter power and peak power spectral density for each 1 dB of 
antenna gain in excess of 23 dBi would be required. Fixed, point-to-
point operations exclude the use of point-to-multipoint systems, 
omnidirectional applications, and multiple collocated transmitters 
transmitting the same information. The operator of the U-NII device, or 
if the equipment is professionally installed, the installer, is 
responsible for ensuring that systems employing high gain directional 
antennas are used exclusively for fixed, point-to-point operations.
    Note to paragraph (a)(3): The Commission strongly recommends that 
parties employing U-NII devices to provide critical communications 
services should determine if there are any nearby Government radar 
systems that could affect their operation.
    (4) The maximum conducted output power must be measured over any 
interval of continuous transmission using instrumentation calibrated in 
terms of an rms-equivalent voltage. The measurement results shall be 
properly adjusted for any instrument limitations, such as detector 
response times, limited resolution bandwidth capability when compared to 
the emission bandwidth, sensitivity, etc., so as to obtain a true peak 
measurement conforming to the above definitions for the emission in 
question.
    (5) The peak power spectral density 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. 
Measurements are made over a bandwidth of 1 MHz or the 26 dB emission 
bandwidth of the device, whichever is less. A resolution bandwidth less 
than the measurement bandwidth can be used, provided that the measured 
power is integrated to show total power over the measurement bandwidth. 
If the resolution bandwidth is approximately equal to the measurement 
bandwidth, and much less than the emission bandwidth of the equipment 
under test, the measured results shall be corrected to account for any 
difference between the resolution bandwidth of the test instrument and 
its actual noise bandwidth.
    (6) The ratio of the peak excursion of the modulation envelope 
(measured using a peak hold function) to the maximum conducted output 
power (measured as specified above) shall not exceed 13 dB across any 1 
MHz bandwidth
[[Page 838]]
or the emission bandwidth whichever is less.
    (b) Undesirable emission limits: Except as shown in paragraph (b)(6) 
of this section, the peak emissions outside of the frequency bands of 
operation shall be attenuated in accordance with the following limits:
    (1) For transmitters operating in the 5.15-5.25 GHz band: all 
emissions outside of the 5.15-5.35 GHz band shall not exceed an EIRP of 
-27 dBm/MHz.
    (2) For transmitters operating in the 5.25-5.35 GHz band: all 
emissions outside of the 5.15-5.35 GHz band shall not exceed an EIRP of 
-27 dBm/MHz. Devices operating in the 5.25-5.35 GHz band that generate 
emissions in the 5.15-5.25 GHz band must meet all applicable technical 
requirements for operation in the 5.15-5.25 GHz band (including indoor 
use) or alternatively meet an out-of-band emission EIRP limit of -27 
dBm/MHz in the 5.15-5.25 GHz band.
    (3) For transmitters operating in the 5.47-5.725 GHz band: all 
emissions outside of the 5.47-5.725 GHz band shall not exceed an EIRP of 
-27 dBm/MHz.
    (4) For transmitters operating in the 5.725-5.825 GHz band: all 
emissions within the frequency range from the band edge to 10 MHz above 
or below the band edge shall not exceed an EIRP of -17 dBm/MHz; for 
frequencies 10 MHz or greater above or below the band edge, emissions 
shall not exceed an EIRP of -27 dBm/MHz.
    (5) The emission measurements shall be performed using a minimum 
resolution bandwidth of 1 MHz. A lower resolution bandwidth may be 
employed near the band edge, when necessary, provided the measured 
energy is integrated to show the total power over 1 MHz.
    (6) Unwanted emissions below 1 GHz must comply with the general 
field strength limits set forth in Sec. 15.209. Further, any U-NII 
devices using an AC power line are required to comply also with the 
conducted limits set forth in Sec. 15.207.
    (7) The provisions of Sec. 15.205 apply to intentional radiators 
operating under this section.
    (8) When measuring the emission limits, the nominal carrier 
frequency shall be adjusted as close to the upper and lower frequency 
block edges as the design of the equipment permits.
    (c) The device shall automatically discontinue transmission in case 
of either absence of information to transmit or operational failure. 
These provisions are not intended to preclude the transmission of 
control or signalling information or the use of repetitive codes used by 
certain digital technologies to complete frame or burst intervals. 
Applicants shall include in their application for equipment 
authorization a description of how this requirement is met.
    (d) [Reserved]
    (e) Within the 5.15-5.25 GHz band, U-NII devices will be restricted 
to indoor operations to reduce any potential for harmful interference to 
co-channel MSS operations.
    (f) U-NII devices are subject to the radio frequency radiation 
exposure requirements specified in Sec. 1.1307(b), Sec. 2.1091 and 
Sec. 2.1093 of this chapter, as appropriate. All equipment shall be 
considered to operate in a ``general population/uncontrolled'' 
environment. Applications for equipment authorization of devices 
operating under this section must contain a statement confirming 
compliance with these requirements for both fundamental emissions and 
unwanted emissions. Technical information showing the basis for this 
statement must be submitted to the Commission upon request.
    (g) Manufacturers of U-NII devices are responsible for ensuring 
frequency stability such that an emission is maintained within the band 
of operation under all conditions of normal operation as specified in 
the users manual.
    (h) Transmit Power Control (TPC) and Dynamic Frequency Selection 
(DFS).
    (1) Transmit power control (TPC). U-NII devices operating in the 
5.25-5.35 GHz band and the 5.47-5.725 GHz band shall employ a TPC 
mechanism. The U-NII device is required to have the capability to 
operate at least 6 dB below the mean EIRP value of 30 dBm. A TPC 
mechanism is not required for systems with an e.i.r.p. of less than 500 
mW.
    (2) Radar Detection Function of Dynamic Frequency Selection (DFS). 
U-NII devices operating in the 5.25-5.35
[[Page 839]]
GHz and 5.47-5.725 GHz bands shall employ a DFS radar detection 
mechanism to detect the presence of radar systems and to avoid co-
channel operation with radar systems. The minimum DFS detection 
threshold for devices with a maximum e.i.r.p. of 200 mW to 1 W is -64 
dBm. For devices that operate with less than 200 mW e.i.r.p. the minimum 
detection threshold is -62 dBm. The detection threshold is the received 
power averaged over 1 microsecond referenced to a 0 dBi antenna. The DFS 
process shall be required to provide a uniform spreading of the loading 
over all the available channels.
    (i) Operational Modes. The DFS requirement applies to the following 
operational modes:
    (A) The requirement for channel availability check time applies in 
the master operational mode.
    (B) The requirement for channel move time applies in both the master 
and slave operational modes.
    (ii) Channel Availability Check Time. A U-NII device shall check if 
there is a radar system already operating on the channel before it can 
initiate a transmission on a channel and when it has to move to a new 
channel. The U-NII device may start using the channel if no radar signal 
with a power level greater than the interference threshold values listed 
in paragraph (h)(2) of this part, is detected within 60 seconds.
    (iii) Channel Move Time. After a radar's presence is detected, all 
transmissions shall cease on the operating channel within 10 seconds. 
Transmissions during this period shall consist of normal traffic for a 
maximum of 200 ms after detection of the radar signal. In addition, 
intermittent management and control signals can be sent during the 
remaining time to facilitate vacating the operating channel.
    (iv) Non-occupancy Period. A channel that has been flagged as 
containing a radar system, either by a channel availability check or in-
service monitoring, is subject to a non-occupancy period of at least 30 
minutes. The non-occupancy period starts at the time when the radar 
system is detected.
[63 FR 40836, July 31, 1998, as amended at 69 FR 2687, Jan. 20, 2004; 69 
FR 54036, Sept. 7, 2004]



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