§ 90.7   Definitions.

   220 MHz service. The radio service for the licensing of frequencies in the
   220-222 MHz band.

   800 MHz Cellular System. In the 806-824 MHz/ 851-869 MHz band, a system that
   uses multiple, interconnected, multi-channel transmit/receive cells capable
   of frequency reuse and automatic handoff between cell sites to serve a
   larger number of subscribers than is possible using non-cellular technology.

   800 MHz High Density Cellular System. In the 806-824 MHz/ 851-869 MHz band,
   a high density cellular system is defined as a cellular system which:

   (1) Has more than five overlapping interactive sites featuring hand-off
   capability; and

   (2) Any one of such sites has an antenna height of less than 30.4 meters
   (100 feet) above ground level with an antenna height above average terrain
   (HAAT)  of less than 152.4 meters (500 feet) and twenty or more paired
   frequencies.

   900 MHz SMR MTA-based license or MTA license. A license authorizing the
   right to use a specified block of 900 MHz SMR spectrum within one of the 47
   Major Trading Areas (“MTAs”), as embodied in Rand McNally's Trading Areas
   System MTA Diskette and geographically represented in the map contained in
   Rand McNally's Commercial Atlas & Marketing Guide (the “MTA Map”), with the
   following exceptions and additions:

   (1) Alaska is separated from the Seattle MTA and is licensed separately.

   (2) Guam and the Northern Mariana Islands are licensed as a single MTA-like
   area.

   (3) Puerto Rico and the United States Virgin Islands are licensed as a
   single MTA-like area.

   (4) American Samoa is licensed as a single MTA-like area.

   The MTA map is available for public inspection in the Reference Information
   Center (Room CY-A257), 445 12th Steet, SW., Washington, DC.

   Antenna height above average terrain (AAT). Height of the center of the
   radiating  element  of  the  antenna  above  the average terrain. (See
   § 90.309(a)(4) for calculation method.)

   Antenna height above sea level. The height of the topmost point of the
   antenna above mean sea level.

   Antenna structure. Structure on which an antenna is mounted.

   Assigned frequency. Center of a frequency band assigned to a station.

   Assigned frequency band. The frequency band the center of which coincides
   with the frequency assigned to the station and the width of which equals the
   necessary  bandwidth  plus  twice  the absolute value of the frequency
   tolerance.

   Authorized  bandwidth.  The frequency band, specified in kilohertz and
   centered on the carrier frequency containing those frequencies upon which a
   total of 99 percent of the radiated power appears, extended to include any
   discrete frequency upon which the power is at least 0.25 percent of the
   total radiated power.

   Automobile emergency licensee. Persons regularly engaged in any of the
   following  activities  who  operate radio stations for transmission of
   communications required for dispatching repair trucks, tow trucks, or other
   road service vehicles to disabled vehicles:

   (1) The operation of a private emergency road service for disabled vehicles
   by associations of owners of private automobiles; or

   (2)  The business of providing to the general public an emergency road
   service for disabled vehicles.

   Average terrain. The average elevation of terrain between 3.2 and 16 km (2
   and 10 miles) from the antenna site.

   Base station. A station at a specified site authorized to communicate with
   mobile stations.

   Basic trading areas. Service areas that are based on the Rand McNally 1992
   Commercial Atlas & Marketing Guide, 123rd Edition, at pages 38-39, with the
   following additions licensed separately as BTA-like areas: American Samoa;
   Guam, Northern Mariana Islands; Mayaguez/Aguadilla-Ponce, Puerto Rico; San
   Juan,   Puerto  Rico;  and  the  United  States  Virgin  Islands.  The
   Mayaguez/Aguadilla-Ponce BTA-like service area consists of the following
   municipios: Adjuntas, Aguada, Aguadilla, Anasco, Arroyo, Cabo Rojo, Coamo,
   Guanica, Guayama, Guayanilla, Hormigueros, Isabela, Jayuya, Juana Diaz,
   Lajas, Las Marias, Maricao, Maunabo, Mayaguez, Moca, Patillas, Penuelas,
   Ponce, Quebradillas, Rincon, Sabana Grande, Salinas, San German, Santa
   Isabel, Villalba, and Yauco. The San Juan BTA-like service area consists of
   all other municipios in Puerto Rico.

   Carrier frequency. The frequency of an unmodulated electromagnetic wave.

   Centralized trunked system. A system in which there is dynamic assignment of
   communications paths by automatically searching all communications paths in
   the system and assigning to a user an open communications path within that
   system. Individual communications paths within a trunked system may be
   classified  as  centralized  or  decentralized  in accordance with the
   requirements of § 90.187.

   Channel loading. The number of mobile transmitters authorized to operate on
   a particular channel within the same service area.

   Communications zone. The service area associated with an individual fixed
   Roadside Unit (RSU). The communications zone is determined based on the RSU
   equipment class specified in section 90.375.

   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. Contention-based protocols
   shall fall into one of two categories:

   (1)  An  unrestricted contention-based protocol is one which can avoid
   co-frequency  interference  with  devices  using  all  other  types of
   contention-based protocols.

   (2) A restricted contention-based protocol is one that does not qualify as
   unrestricted.

   Control  point.  Any place from which a transmitter's functions may be
   controlled.

   Control station. An Operational Fixed Station, the transmissions of which
   are used to control automatically the emissions or operation of another
   radio station at a specified location.

   Conventional radio system. A method of operation in which one or more radio
   frequency channels are assigned to mobile and base stations but are not
   employed as a trunked group. An “urban-conventional system” is one whose
   transmitter site is located within 24 km (15 miles) of the geographic center
   of any of the first 50 urbanized areas (ranked by population) of the United
   States. A “sub-urban-conventional system” is one whose transmitter site is
   located more than 24 km (15 miles) from the geographic center of the first
   50 urbanized areas. See Table 21, Rank of Urbanized Areas in the United
   States by Population, page 1-87, U.S. Census (1970); and table 1 of § 90.635.

   Critical  Infrastructure  Industry  (CII). State, local government and
   non-government  entities, including utilities, railroads, metropolitan
   transit systems, pipelines, private ambulances, volunteer fire departments,
   and  not-for-profit  organizations that offer emergency road services,
   providing private internal radio services provided these private internal
   radio services are used to protect safety of life, health, or property; and
   are not made commercially available to the public.

   Decentralized trunked system. A system which monitors the communications
   paths within its assigned channels for activity within and outside of the
   trunked system and transmits only when an available communications path is
   found.  Individual communications paths within a trunked system may be
   classified  as  centralized  or  decentralized  in accordance with the
   requirements of § 90.187.

   Dedicated Short-Range Communications Services (DSRCS). The use of radio
   techniques to transfer data over short distances between roadside and mobile
   units,  between mobile units, and between portable and mobile units to
   perform operations related to the improvement of traffic flow, traffic
   safety, and other intelligent transportation service applications in a
   variety  of  environments.  DSRCS systems may also transmit status and
   instructional messages related to the units involved.

   Dispatch point. Any place from which radio messages can be originated under
   the supervision of a control point.

   EA-based or EA license. A license authorizing the right to use a specified
   block of SMR or LMS spectrum within one of the 175 Economic Areas (EAs) as
   defined by the Department of Commerce Bureau of Economic Analysis. The EA
   Listings and the EA Map are available for public inspection at the Reference
   Information Center (Room CY-A257), 445 12th Steet, SW., Washington, DC
   20554.

   Economic Areas (EAs). A total of 175 licensing regions based on the United
   States Department of Commerce Bureau of Economic Analysis Economic Areas
   defined as of February 1995, with the following exceptions:

   (1) Guam and Northern Mariana Islands are licensed as a single EA-like area
   (identified as EA 173 in the 220 MHz Service);

   (2) Puerto Rico and the U.S. Virgin Islands are licensed as a single EA-like
   area (identified as EA 174 in the 220 MHz Service); and

   (3) American Samoa is licensed as a single EA-like area (identified as EA
   175 in the 220 MHz Service).

   Effective radiated power (ERP). The power supplied to an antenna multiplied
   by the relative gain of the antenna in a given direction.

   Emergency medical licensee. Persons or entities engaged in the provision of
   basic or advanced life support services on an ongoing basis that operate
   radio stations for transmission of communications essential for the delivery
   or rendition of emergency medical services for the provision of basic or
   advanced life support.

   Enhanced Specialized Mobile Radio System (ESMR). A specialized mobile radio
   (SMR) system operating in the 800 MHz band which employs an 800 MHz cellular
   system as defined in this section.

   Film  and  video  production licensee. Persons primarily engaged in or
   providing  direct technical support to the production, videotaping, or
   filming of motion pictures or television programs, such as movies, programs,
   news programs, special events, educational programs, or training films,
   regardless of whether the productions are prepared primarily for final
   exhibition  at theatrical outlets or on television or for distribution
   through other mass communications outlets.

   Fire licensee. Any territory, possession, state, city, county, town, or
   similar governmental entity, and persons or organizations charged with
   specific  fire  protection  activities that operate radio stations for
   transmission of communications essential to official fire activities.

   First Responder Network Authority. An entity established by the Middle Class
   Tax Relief and Job Creation Act of 2012 as an independent authority within
   the  National  Telecommunications  and  Information Administration and
   designated by that statute to hold a nationwide license associated with the
   758-769 MHz and 788-799 MHz bands for use in deploying a nationwide public
   safety broadband network.

   Fixed relay station. A station at a specified site used to communicate with
   another station at another specified site.

   Forest products licensee. Persons primarily engaged in tree logging, tree
   farming, or related woods operations, including related hauling activities,
   if the hauling activities are performed under contract to, and exclusively
   for, persons engaged in woods operations or engaged in manufacturing lumber,
   plywood, hardboard, or pulp and paper products from wood fiber.

   Forward links. Transmissions in the frequency bands specified in § 90.357(a)
   and  used to control and interrogate the mobile units to be located by
   multilateration LMS systems.

   Frequency coordination. The process of obtaining the recommendation of a
   frequency coordinator for a frequency(ies) that will most effectively meet
   the applicant's needs while minimizing interference to licensees already
   operating within a given frequency band.

   Frequency coordinator. An entity or organization that has been certified by
   the Commission to recommend frequencies for use by licensees in the Private
   Land Mobile Radio Services.

   Geographic center. The geographic center of an urbanized area is defined by
   the coordinates given at table 1 of § 90.635.

   Geophysical telemetry. Telemetry involving the simultaneous transmission of
   seismic data from numerous locations to a central receiver and digital
   recording unit.

   Harmful  interference. For the purposes of resolving conflicts between
   stations operating under this part, any emission, radiation, or induction
   which specifically degrades, obstructs, or interrupts the service provided
   by such stations.

   Interconnection. Connection through automatic or manual means of private
   land  mobile radio stations with the facilities of the public switched
   telephone network to permit the transmission of messages or signals between
   points in the wireline or radio network of a public telephone company and
   persons served by private land mobile radio stations. Wireline or radio
   circuits or links furnished by common carriers, which are used by licensees
   or other authorized persons for transmitter control (including dial-up
   transmitter control circuits) or as an integral part of an authorized,
   private, internal system of communication or as an integral part of dispatch
   point circuits in a private land mobile radio station are not considered to
   be interconnection for purposes of this rule part.

   Internal system. An internal system of communication is one in which all
   messages are transmitted between the fixed operating positions located on
   premises controlled by the licensee and the associated mobile stations or
   paging receivers of the licensee. (See subpart O).

   Interoperability. An essential communication link within public safety and
   public service wireless communications systems which permits units from two
   or more different entities to interact with one another and to exchange
   information according to a prescribed method in order to achieve predictable
   results.

   Itinerant operation. Operation of a radio station at unspecified locations
   for varying periods of time.

   Land mobile radio service. A mobile service between base stations and land
   mobile stations, or between land mobile stations.

   Land mobile radio system. A regularly interacting group of base, mobile and
   associated control and fixed relay stations intended to provide land mobile
   radio communications service over a single area of operation.

   Land station. A station in the mobile service not intended to be used while
   in motion. [As used in this part, the term may be used to describe a base,
   control,  fixed, operational fixed or fixed relay station, or any such
   station authorized to operate in the “temporary” mode.]

   Line A. An imaginary line within the U.S., approximately paralleling the
   U.S.-Canadian  border, north of which Commission coordination with the
   Canadian authorities in the assignment of frequencies is generally required.
   It  begins at Aberdeen, Washington, running by great circle arc to the
   intersection  of  48�°  N., 120�° W., then along parallel 48�° N., to the
   intersection of 95�° W., thence by great circle arc through the southernmost
   point of Duluth, Minnesota, thence by great circle arc to 45�° N., 85�° W.,
   thence southward along meridian 85�° W. to its intersection with parallel
   41�° N., to its intersection with meridian 82�° W., thence by great circle arc
   through the southernmost point of Bangor, Maine, thence by great circle arc
   through the southernmost of Searsport, Maine, at which point it terminates.

   Line C. An imaginary line in Alaska approximately paralleling the border
   with Canada, East of which Commission coordination with Canadian authorities
   in the assignment of frequencies is generally required. It begins at the
   intersection  of  70�°  N.,  144�° W., thence by great circle arc to the
   intersection of 60�° N., 143�° W., thence by great circle arc so as to include
   all the Alaskan Panhandle.

   Location  and Monitoring Service (LMS). The use of non-voice signaling
   methods to locate or monitor mobile radio units. LMS systems may transmit
   and receive voice and non-voice status and instructional information related
   to such units.

   Major trading areas. Service areas based on the Rand McNally 1992 Commercial
   Atlas & Marketing Guide, 123rd Edition, at pages 38-39, with the following
   exceptions and additions:

   (a) Alaska is separated from the Seattle MTA and is licensed separately.

   (b) Guam and the Northern Mariana Islands are licensed as a single MTA-like
   area.

   (c) Puerto Rico and the United States Virgin Islands are licensed as a
   single MTA-like area.

   (d) American Samoa is licensed as a single MTA-like area.

   Manufacturers licensee. Persons primarily engaged in any of the following
   manufacturing activities:

   (1)  The  mechanical or chemical transformation of substances into new
   products within such establishments as plants, factories, shipyards, or
   mills   which  employ,  in  that  process,  powerdriven  machines  and
   materials-handling equipment;

   (2)  The  assembly  of components of manufactured products within such
   establishments as plants, factories, shipyards, or mills where the new
   product  is  neither  a  new  structure  nor  other fixed improvement.
   Establishments primarily engaged in the wholesale or retail trade, or in
   service activities, even though they fabricate or assemble any or all the
   products or commodities handled, are not included in this category; or

   (3) The providing of supporting services or materials by a corporation to
   its parent corporation, to another subsidiary of its parent or to its own
   subsidiary, where such supporting services or materials are directly related
   to those regular activities of such parent or subsidiary which are eligible
   under paragraphs (1) or (2) of this definition.

   Meteor burst communications. Communications by the propagation of radio
   signals reflected off ionized meteor trails.

   Mobile relay station. A base station in the mobile service authorized to
   retransmit automatically on a mobile service frequency communications which
   originate on the transmitting frequency of the mobile station.

   Mobile  repeater  station.  A  mobile station authorized to retransmit
   automatically on a mobile service frequency, communications to or from
   hand-carried transmitters.

   Mobile service. A service of radiocommunication between mobile and base
   stations, or between mobile stations.

   Mobile station. A station in the mobile service intended to be used while in
   motion or during halts at unspecified points. This includes hand carried
   transmitters.

   Motor carrier licensee. Persons primarily engaged in providing a common or
   contract  motor carrier transportation service in any of the following
   activities: Provided, however, that motor vehicles used as taxicabs, livery
   vehicles,  or school buses, and motor vehicles used for sightseeing or
   special charter purposes, shall not be included within the meaning of this
   term. For purposes of this definition, an urban area is defined as being one
   or more contiguous, incorporated or unincorporated cities, boroughs, towns,
   or villages, having an aggregate population of 2,500 or more persons.

   (1) The transportation of passengers between urban areas;

   (2) The transportation of property between urban areas;

   (3) The transportation of passengers within a single urban area; or

   (4) The transportation, local distribution or collection of property within
   a single urban area.

   MTA-based license or MTA license. A license authorizing the right to use a
   specified block of SMR spectrum within one of the 51 Major Trading Areas
   (“MTAs”), as embodied in Rand McNally's Trading Area System MTA Diskette and
   geographically represented in the map contained in Rand McNally's Commercial
   Atlas & Marketing Guide (the “MTA Map”). The MTA Listings, the MTA Map and
   the Rand McNally/AMTA license agreement are available for public inspection
   at the Reference Information Center in the Consumer and Governmental Affairs
   Bureau.

   Multilateration LMS system. A system that is designed to locate vehicles or
   other objects by measuring the difference of time of arrival, or difference
   in phase, of signals transmitted from a unit to a number of fixed points or
   from a number of fixed points to the unit to be located.

   Mutually  exclusive  application. Two or more pending applications are
   mutually  exclusive  if the grant of one application would effectively
   preclude the grant of one or more of the others under Commission rules
   governing the services involved.

   Non-multilateration LMS System. A system that employs any of a number of
   non-multilateration technologies to transmit information to and/or from
   vehicular units.

   On-Board  unit  (OBU). An On-Board Unit is a DSRCS transceiver that is
   normally mounted in or on a vehicle, or which in some instances may be a
   portable unit. An OBU can be operational while a vehicle or person is either
   mobile or stationary. The OBUs receive and contend for time to transmit on
   one  or  more radio frequency (RF) channels. Except where specifically
   excluded, OBU operation is permitted wherever vehicle operation or human
   passage is permitted. The OBUs mounted in vehicles are licensed by rule
   under part 95 of this chapter and communicate with Roadside Units (RSUs) and
   other OBUs. Portable OBUs are also licensed by rule under part 95 of this
   chapter.   OBU  operations  in  the  Unlicensed  National  Information
   Infrastructure (UNII) Bands follow the rules in those bands.

   Operational  fixed  station.  A  fixed  station,  not  open  to public
   correspondence,  operated  by,  and for the sole use of those agencies
   operating their own radiocommunication facilities in the Public Safety,
   Industrial, Land Transportation, Marine, or Aviation Radio Services. (This
   includes all stations in the fixed service under this part.)

   Output power. The radio frequency output power of a transmitter's final
   radio frequency stage as measured at the output terminal while connected to
   a load of the impedance recommended by the manufacturer.

   Paging. A one-way communications service from a base station to mobile or
   fixed receivers that provide signaling or information transfer by such means
   as tone, tone-voice, tactile, optical readout, etc.

   Person. An individual, partnership, association, joint stock company, trust
   or corporation.

   Petroleum licensee. Persons primarily engaged in prospecting for, producing,
   collecting, refining, or transporting by means of pipeline, petroleum or
   petroleum products (including natural gas).

   Police licensee. Any territory, possession, state, city, county, town, or
   similar governmental entity including a governmental institution authorized
   by law to provide its own police protection that operate radio stations for
   transmission of communications essential to official police activities.

   Power  licensee.  Persons  primarily  engaged  in any of the following
   activities:

   (1) The generation, transmission, or distribution of electrical energy for
   use by the general public or by the members of a cooperative organization;

   (2) The distribution of manufactured or natural gas by means of pipe line,
   for  use  by  the  general  public  or by the members of a cooperative
   organization, or, in a combination of that activity with the production,
   transmission or storage of manufactured or natural gas preparatory to such
   distribution;

   (3) The distribution of steam by means of pipeline or, of water by means of
   pipeline, canal, or open ditch, for use by the general public or by the
   members of a cooperative organization, or in a combination of that activity
   with the collection, transmission, storage, or purification of water or the
   generation of steam preparatory to such distribution; or

   (4) The providing of a supporting service by a corporation directly related
   to activities of its parent corporation, of another subsidiary of the same
   parent,  or of its own subsidiary, where the party served is regularly
   engaged in any of the activities set forth in this definition.

   Private carrier. An entity licensed in the private services and authorized
   to provide communications service to other private services on a commercial
   basis.

   Radio call box. A transmitter used by the public to request fire, police,
   medical, road service, or other emergency assistance.

   Radio teleprinting. Radio transmissions to a printing telegraphic instrument
   having a signal-actuated mechanism for automatically printing received
   messages.

   Radiodetermination. The determination of position, or the obtaining of
   information relating to position, by means of the propagation of radio
   waves.

   Radiofacsimile. A system of radiocommunication for the transmission of fixed
   images, with or without half-tones, with a view to their reproduction in a
   permanent form.

   Radiolocation. Radiodetermination used for purposes other than those of
   radionavigation.

   Radionavigation. Radiodetermination used for the purposes of navigation,
   including obstruction warning.

   Railroad licensee. Railroad common carriers which are regularly engaged in
   the  transportation  of passengers or property when such passengers or
   property are transported over all or part of their route by railroad.

   Regional Economic Area Groupings (REAGs). The six geographic areas for
   Regional licensing in the 220-222 MHz band, based on the United States
   Department of Commerce Bureau of Economic Analysis Economic Areas (see  60 FR 13114   (March 10, 1995)) defined as of February 1995, and specified as
   follows:

   REAG 1 (Northeast): REAG 1 consists of the following EAs: EA 001 (Bangor,
   ME) through EA 011 (Harrisburg-Lebanon-Carlisle, PA); and EA 054 (Erie, PA).

   REAG  2  (Mid-Atlantic):  REAG 2 consists of the following EAs: EA 012
   (Philadelphia-Wilmington-Atlantic  City,  PA-NJ-DE-MD)  through EA 026
   (Charleston-North Charleston, SC); EA 041 (Greenville-Spartanburg-Anderson,
   SC-NC);  EA 042 (Asheville, NC); EA 044 (Knoxville, TN) through EA 053
   (Pittsburgh, PA-WV); and EA 070 (Louisville, KY-IN).

   REAG  3  (Southeast):  REAG  3  consists  of the following EAs: EA 027
   (Augusta-Aiken,  GA-SC)  through  EA  040  (Atlanta, GA-AL-NC); EA 043
   (Chattanooga,  TN-GA); EA 069 (Evansville-Henderson, IN-KY-IL); EA 071
   (Nashville,   TN-KY)  through  EA  086  (Lake  Charles,  LA);  EA  088
   (Shreveport-Bossier City, LA-AR) through EA 090 (Little Rock-North Little
   Rock, AR); EA 095 (Jonesboro, AR-MO); EA 096 (St. Louis, MO-IL); and EA 174
   (Puerto Rico and the U.S. Virgin Islands).

   REAG  4  (Great  Lakes):  REAG 4 consists of the following EAs: EA 055
   Cleveland-Akron,  OH-PA) through EA 068 (Champaign-Urbana, IL); EA 097
   (Springfield, IL-MO); and EA 100 (Des Moines, IA-IL-MO) through EA 109
   (Duluth-Superior, MN-WI).

   REAG 5 (Central/Mountain): REAG 5 consists of the following EAs: EA 087
   (Beaumont-Port Arthur, TX); EA 091 (Forth Smith, AR-OK) through EA 094
   (Springfield, MO); EA 098 (Columbia, MO); EA 099 (Kansas City, MO-KS); EA
   110 (Grand Forks, ND-MN) through EA 146 (Missoula, MT); EA 148 (Idaho Falls,
   ID-WY); EA 149 (Twin Falls, ID); EA 152 (Salt Lake City-Ogden, UT-ID); and
   EA 154 (Flagstaff, AZ-UT) through EA 159 (Tucson, AZ).

   REAG 6 (Pacific): REAG 6 consists of the following EAs: EA 147 (Spokane,
   WA-ID); EA 150 (Boise City, ID-OR); EA 151 (Reno, NV-CA); EA 153 (Las Vegas,
   NV-AZ-UT); EA 160 (Los Angeles-Riverside-Orange County, CA-AZ) through EA
   173 (Guam and the Northern Mariana Islands); and EA 175 (American Samoa).

   Regional license. A license authorizing the right to use a specified block
   of 220-222 MHz spectrum within one of six Regional Economic Area Groupings
   (REAGs).

   Relay press licensee. Persons primarily engaged in the publication of a
   newspaper or in the operation of an established press association.

   Roadside unit (RSU). A Roadside Unit is a DSRC transceiver that is mounted
   along a road or pedestrian passageway. An RSU may also be mounted on a
   vehicle or is hand carried, but it may only operate when the vehicle or
   hand-carried unit is stationary. Furthermore, an RSU operating under this
   part is restricted to the location where it is licensed to operate. However,
   portable  or hand-held RSUs are permitted to operate where they do not
   interfere with a site-licensed operation. A RSU broadcasts data to OBUs or
   exchanges data with OBUs in its communications zone. An RSU also provides
   channel assignments and operating instructions to OBUs in its communications
   zone, when required.

   Roadway bed surface. For DSRCS, the road surface at ground level.

   Secondary operation. Radio communications which may not cause interference
   to operations authorized on a primary basis and which are not protected from
   interference from those primary operations.

   Service availability. The use of a public safety broadband network on a
   day-to-day basis for operational purposes by at least fifty users.

   Signal amplifier. A device that amplifies radio frequency signals and is
   connected to a mobile radio transceiver, portable or handset, typically to
   the antenna connector. Note that a signal amplifier is not the same thing as
   a signal booster.

   Signal booster. A device at a fixed location which automatically receives,
   amplifies,  and retransmits on a one-way or two-way basis, the signals
   received from base, fixed, mobile, and portable stations, with no change in
   frequency or authorized bandwidth. A signal booster may be either narrowband
   (Class  A),  in  which  case the booster amplifies only those discrete
   frequencies intended to be retransmitted, or broadband (Class B), in which
   case  all signals within the passband of the signal booster filter are
   amplified.

   SMSA (Standard Metropolitan Statistical Area). A city of 50,000 or more
   population and the surrounding counties.

   Special  industrial  licensee. Persons regularly engaged in any of the
   following activities:

   (1) The operation of farms, ranches, or similar land areas, for the quantity
   production  of  crops  or  plants;  vines or trees (excluding forestry
   operations); or for the keeping, grazing or feeding of livestock for animal
   products, animal increase, or value enhancement;

   (2) Plowing, soil conditioning, seeding, fertilizing, or harvesting for
   agricultural activities;

   (3) Spraying or dusting of insecticides, herbicides, or fungicides, in areas
   other than enclosed structures;

   (4) Livestock breeding service;

   (5)  The  operation  of a commercial business regularly engaged in the
   construction of roads, bridges, sewer systems, pipelines, airfields, or
   water, oil, gas, or power production, collection, or distribution systems.
   The construction of buildings is not included in this category;

   (6) The operation of mines for the recovery of solid fuels, minerals, metal,
   rock, sand and gravel from the earth or the sea, including the exploration
   for and development of mining properties;

   (7)  Maintaining,  patrolling  or repairing gas or liquid transmission
   pipelines, tank cars, water or waste disposal wells, industrial storage
   tanks, or distribution systems of public utilities;

   (8) Acidizing, cementing, logging, perforating, or shooting activities, and
   services of a similar nature incident to the drilling of new oil or gas
   wells, or the maintenance of production from established wells;

   (9) Supplying chemicals, mud, tools, pipe, and other materials or equipment
   unique to the petroleum and gas production industry, as the primary activity
   of the applicant if delivery, installation or application of these materials
   requires the use of specifically fitted conveyances;

   (10) The delivery of ice or fuel to the consumer for heating, lighting,
   refrigeration or power generation purposes, by means other than pipelines or
   railroads when such products are not to be resold following their delivery;
   or

   (11) The delivery and pouring of ready mixed concrete or hot asphalt mix.

   Specialized Mobile Radio system. A radio system in which licensees provide
   land mobile communications services (other than radiolocation services) in
   the 800 MHz and 900 MHz bands on a commercial basis to entities eligible to
   be licensed under this part, Federal Government entities, and individuals.

   State.  Any  of  the  50  United States, the District of Columbia, the
   Commonwealth  of Puerto Rico, the Commonwealth of the Northern Mariana
   Islands, the U.S. Virgin Islands, American Samoa, and Guam.

   Station authorization. A license issued by the Commission for the operation
   of a radio station.

   Taxicab licensee. Persons regularly engaged in furnishing to the public for
   hire a nonscheduled passenger land transportation service (which may also
   include the occasional transport of small items of property) not operated
   over a regular route or between established terminals.

   Telecommand.  The transmission of non-voice signals for the purpose of
   remotely controlling a device.

   Telemetering (also telemetry). The transmission of non-voice signals for the
   purpose of automatically indicating or recording measurements at a distance
   from the measuring instrument.

   Telephone maintenance licensee. Communications common carriers engaged in
   the  provision  of  landline  local  exchange  telephone  service,  or
   inter-exchange communications service, and radio communications common
   carriers authorized under part 21 of this chapter. Resellers that do not own
   or control transmission facilities are not included in this category.

   Travelers' information station. A base station in the Public Safety Pool
   used to transmit non-commercial, voice information pertaining to traffic and
   road  conditions,  traffic hazard and traveler advisories, directions,
   availability of lodging, rest stops, and service stations, and descriptions
   of local points of interest.

   Trunk group. All of the trunks of a given type of characteristic that extend
   between two switching points.

   Trunk (telephony). A one or two-way channel provided as a common traffic
   artery between switching equipment.

   Trunked radio system. A radio system employing technology that provides the
   ability  to  search  two  or  more  available communications paths and
   automatically assigns an open communications path to a user.

   Universal Licensing System (ULS). The consolidated database, application
   filing system and processing system for all Wireless Telecommunications
   Services. The ULS offers Wireless Telecommunications Bureau (WTB) applicants
   and the general public electronic filing of all applications requests, and
   full public access to all WTB licensing data.

   Urbanized area. A city and the surrounding closely settled territories.

   [ 43 FR 54791 , Nov. 22, 1978]

   Editorial Note: For Federal Register citations affecting § 90.7, see the List
   of CFR Sections Affected, which appears in the Finding Aids section of the
   printed volume and at www.fdsys.gov.

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Subpart B—Public Safety Radio Pool

   Source:  62 FR 18845 , Apr. 17, 1997, unless otherwise noted.

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