Goto Section: 15.401 | 15.405 | Table of Contents

FCC 15.403
Revised as of September 1, 2021
Goto Year:2020 | 2022
  §  15.403   Definitions.

   Access Point (AP). A U-NII transceiver that operates either as a bridge
   in a peer-to-peer connection or as a connector between the wired and
   wireless segments of the network or as a relay between wireless network

   Automated Frequency Coordination (AFC) System. A system that
   automatically determines and provides lists of which frequencies are
   available for use by standard power access points operating in the
   5.925-6.425 GHz and 6.525-6.875 GHz bands.

   Available Channel. A radio channel on which a Channel Availability
   Check has not identified the presence of a radar.

   Average Symbol Envelope Power. The average symbol envelope power is the
   average, taken over all symbols in the signaling alphabet, of the
   envelope power for each symbol.

   Channel Availability Check. A check during which the U-NII device
   listens on a particular radio channel to identify whether there is a
   radar operating on that radio channel.

   Channel Move Time. The time needed by a U-NII device to cease all
   transmissions on the current channel upon detection of a radar signal
   above the DFS detection threshold.

   Client Device. A U-NII device whose transmissions are generally under
   the control of an access point and is not capable of initiating a

   Contention-based protocol. A protocol that allows multiple users to
   share the same spectrum by defining the events that must occur when two
   or more transmitters attempt to simultaneously access the same channel
   and establishing rules by which a transmitter provides reasonable
   opportunities for other transmitters to operate. Such a protocol may
   consist of procedures for initiating new transmissions, procedures for
   determining the state of the channel (available or unavailable), and
   procedures for managing retransmissions in the event of a busy channel.

   Digital modulation. The process by which the characteristics of a
   carrier wave are varied among a set of predetermined discrete values in
   accordance with a digital modulating function as specified in document
   ANSI C63.17-1998.

   Dynamic Frequency Selection (DFS) is a mechanism that dynamically
   detects signals from other systems and avoids co-channel operation with
   these systems, notably radar systems.

   DFS Detection Threshold. The required detection level defined by
   detecting a received signal strength (RSS) that is greater than a
   threshold specified, within the U-NII device channel bandwidth.

   Emission bandwidth. For purposes of this subpart the emission bandwidth
   is 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.

   Fixed client device. For the purpose of this subpart, a client device
   intended as customer premise equipment that is permanently attached to
   a structure, operates only on channels provided by an AFC, has a
   geolocation capability, and complies with antenna pointing angle

   Indoor Access Point. For the purpose of this subpart, an access point
   that operates in the 5.850-5.895 GHz or the 5.925-7.125 GHz band, is
   supplied power from a wired connection, has an integrated antenna, is
   not battery powered, and does not have a weatherized enclosure. Indoor
   access point devices must bear the following statement in a conspicuous
   location on the device and in the user's manual: FCC regulations
   restrict operation of this device to indoor use only.

   In-Service Monitoring. A mechanism to check a channel in use by the
   U-NII device for the presence of a radar.

   Non-Occupancy Period. The required period in which, once a channel has
   been recognized as containing a radar signal by a U-NII device, the
   channel will not be selected as an available channel.

   Operating Channel. Once a U-NII device starts to operate on an
   Available Channel then that channel becomes the Operating Channel.

   Maximum Power Spectral Density. The maximum power spectral density is
   the maximum power spectral density, within the specified measurement
   bandwidth, within the U-NII device operating band.

   Maximum Conducted Output Power. The total transmit power delivered to
   all antennas and antenna elements averaged across all symbols in the
   signaling alphabet when the transmitter is operating at its maximum
   power control level. Power must be summed across all antennas and
   antenna elements. The average must not include any time intervals
   during which the transmitter is off or is transmitting at a reduced
   power level. If multiple modes of operation are possible (e.g.,
   alternative modulation methods), the maximum conducted output power is
   the highest total transmit power occurring in any mode.

   Power Spectral Density. The power spectral density is the total energy
   output per unit bandwidth from a pulse or sequence of pulses for which
   the transmit power is at its maximum level, divided by the total
   duration of the pulses. This total time does not include the time
   between pulses during which the transmit power is off or below its
   maximum level.

   Pulse. A pulse is a continuous transmission of a sequence of modulation
   symbols, during which the average symbol envelope power is constant.

   RLAN. Radio Local Area Network.

   Standard Power Access Point. An access point that operates in the
   5.925-6.425 GHz and 6.525-6.875 GHz bands pursuant to direction from an
   Automated Frequency Coordination System.

   Subordinate Device. For the purpose of this subpart, a device that
   operates in the 5.850-5.895 GHz band or in the 5.925-7.125 GHz band
   under the control of an Indoor Access Point, is supplied power from a
   wired connection, has an integrated antenna, is not battery powered,
   does not have a weatherized enclosure, and does not have a direct
   connection to the internet. Subordinate devices must not be used to
   connect devices between separate buildings or structures. Subordinate
   devices must be authorized under certification procedures in part 2 of
   this chapter. Modules may not be certified as subordinate devices.

   Transmit Power Control (TPC). A feature that enables a U-NII device to
   dynamically switch between several transmission power levels in the
   data transmission process.

   U-NII devices. Intentional radiators operating in the frequency bands
   5.15-5.35 GHz, 5.47-5.895 GHz, and 5.925-7.125 GHz that use wideband
   digital modulation techniques and provide a wide array of high data
   rate mobile and fixed communications for individuals, businesses, and

   [ 85 FR 31410 , May 26, 2020, as amended at  86 FR 23295 , May 3, 2021]


Goto Section: 15.401 | 15.405

Goto Year: 2020 | 2022
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