Sec.  25.201   Definitions.

   

   Link to an amendment published at  70 FR 19318 , Apr. 13, 2005.

   Active satellite. An earth satellite carrying a station intended to
   transmit or re-transmit radiocommunication signals.

   Ambulatory. Not stationary. Baselines from which maritime boundaries
   are measured change with accretion- and erosion-caused ambulation of
   the boundaries themselves.

   Ancillary terrestrial component. The term "ancillary terrestrial
   component" means a terrestrial communications network used in
   conjunction with a qualifying satellite network system authorized
   pursuant to these rules and the conditions established in the Report
   and Order issued in IB Docket 01-185, Flexibility for Delivery of
   Communications by Mobile Satellite Service Providers in the 2 GHz
   Band, the L-Band, and the 1.6/2.4 GHz Band.

   Ancillary terrestrial component base station. The term "ancillary
   terrestrial component base station" means a terrestrial fixed facility
   used to transmit communications to or receive communications from one
   or more ancillary terrestrial component mobile terminals.

   Ancillary terrestrial component mobile terminal. The term "ancillary
   terrestrial component mobile terminal" means a terrestrial mobile
   facility used to transmit communications to or receive communications
   from an ancillary terrestrial component base station or a space
   station.

   Base Earth Station. An earth station in the fixed-satellite service
   or, in some cases, in the land mobile-satellite service, located at a
   specified fixed point or within a specified area on land to provide a
   feeder link for the land mobile-satellite service. (RR)

   Baseline. The line from which maritime zones are measured, also known
   as the coast line. The baseline is a combination of the low-water line
   ("low-tide elevation") and closing lines across the mouths of inland
   water bodies. The baseline is defined by a series of baseline points.
   The baseline points are not just the low-water marks of the shore of
   mainland but also includes islands and "low-water elevations" (i.e.,
   natural rocks). Baseline points are ambulatory, and thus, require
   adjustment from time-to-time by the U.S. Department of State's
   Baseline Committee.

   Coordination distance. For the purposes of this part, the expression
   "coordination distance" means the distance from an earth station,
   within which there is a possibility of the use of a given transmitting
   frequency at this earth station causing harmful interference to
   stations in the fixed or mobile service, sharing the same band, or of
   the use of a given frequency for reception at this earth station
   receiving harmful interference from such stations in the fixed or
   mobile service.

   Direct Broadcast Satellite Service. A radiocommunication service in
   which signals transmitted or retransmitted by space stations, using
   frequencies specified in Sec. 25.202(a)(7), are intended for direct
   reception by the general public. For the purposes of this definition,
   the term direct reception shall encompass both individual reception
   and community reception.

   Earth station. A station located either on the Earth's surface or
   within the major portion of the Earth's atmosphere intended for
   communication:

   (a) With one or more space stations; or

   (b) With one or more stations of the same kind by means of one or more
   reflecting satellites or other objects in space.

   Equivalent power flux-density. The equivalent power flux-density
   (EPFD) is the sum of the power flux-densities produced at a
   geostationary satellite orbit (GSO) receive earth or space station on
   the Earth's surface or in the geostationary satellite orbit, as
   appropriate, by all the transmit stations within a non-geostationary
   satellite orbit fixed-satellite service (NGSO FSS) system, taking into
   account the off-axis discrimination of a reference receiving antenna
   assumed to be pointing in its nominal direction. The equivalent power
   flux-density, in dB(W/m2) in the reference bandwidth, is calculated
   using the following formula:
   [MATH:  :MATH]

   Where:

   Na is the number of transmit stations in the non-geostationary
   satellite orbit system that are visible from the GSO receive station
   considered on the Earth's surface or in the geostationary satellite
   orbit, as appropriate;

   i is the index of the transmit station considered in the
   non-geostationary satellite orbit system;

   Pi is the RF power at the input of the antenna of the transmit
   station, considered in the non-geostationary satellite orbit system in
   dBW in the reference bandwidth;

   2i is the off-axis angle between the boresight of the transmit station
   considered in the non-geostationary satellite orbit system and the
   direction of the GSO receive station;

   Gt(2i) is the transmit antenna gain (as a ratio) of the station
   considered in the non-geostationary satellite orbit system in the
   direction of the GSO receive station;

   di is the distance in meters between the transmit station considered
   in the non-geostationary satellite orbit system and the GSO receive
   station;

   Ni is the off-axis angle between the boresight of the antenna of the
   GSO receive station and the direction of the ith transmit station
   considered in the non-geostationary satellite orbit system;

   Gr(Ni) is the receive antenna gain (as a ratio) of the GSO receive
   station in the direction of the ith transmit station considered in the
   non-geostationary satellite orbit system;

   Gr,[max] is the maximum gain (as a ratio) of the antenna of the GSO
   receive station;

   Earth Station on Vessel ("ESV"). An ESV is an earth station onboard a
   craft designed for traveling on water receiving from and transmitting
   to fixed-satellite space stations.

   Fixed earth station. An earth station intended to be used at a
   specified fixed point.

   Fixed-Satellite Service. A radiocommunication service between earth
   stations at given positions, when one or more satellites are used; the
   given position may be a specified fixed point or any fixed point
   within specified areas; in some cases this service includes
   satellite-to-satellite links, which may also be operated in the
   inter-satellite service; the fixed-satellite service may also include
   feeder links of other space radiocommunication services. (RR)

   Geostationary satellite. A geosynchronous satellite whose circular and
   direct orbit lies in the plane of the Earth's equator and which thus
   remains fixed relative to the Earth; by extension, a satellite which
   remains approximately fixed relative to the Earth.

   2 GHz Mobile Satellite Service. A mobile-satellite service that
   operated in the 2000-2020 MHz and 2180-2200 MHz frequency bands, or in
   any portion thereof.

   Inter-Satellite Service. A radiocommunication service providing links
   between artificial earth satellites.

   Land Earth Station. An earth station in the fixed-satellite service
   or, in some cases, in the mobile-satellite service, located at a
   specified fixed point or within a specified area on land to provide a
   feeder link for the mobile-satellite service. (RR)

   Land Mobile Earth Station. A mobile earth station in the land
   mobile-satellite service capable of surface movement within the
   geographical limits of a country or continent. (RR)

   Low-Tide Elevation. A naturally formed area of land that is surrounded
   by and above water at low tide but below water at high tide. Low-tide
   elevations serve as part of the coast line when they are within the
   breath of the territorial sea of the mainland (either uplands or
   inland waters) or an island. 1958 Convention on the Territorial Sea,
   Article 11.

   Mobile earth station. An earth station intended to be used while in
   motion or during halts at unspecified points.

   Mobile-Satellite Service. A radiocommunication service:

   (1) Between mobile earth stations and one or more space stations, or
   between space stations used by this service; or

   (2) Between mobile earth stations, by means of one or more space
   stations.

   This service may also include feeder links necessary for its
   operation. (RR)

   NGSO FSS gateway earth station. A gateway earth station is an earth
   station complex consisting of multiple interconnecting earth station
   antennas supporting the communication routing and switching functions
   of a non-geostationary satellite orbit fixed-satellite service (NGSO
   FSS) system as a whole. A gateway earth station in the NGSO FSS:

   (1) Does not originate or terminate radiocommunication traffic, but
   interconnects multiple non-collocated user earth stations operating in
   frequency bands other than designated gateway bands, through a
   satellite with other primary terrestrial networks, such as the public
   switched telephone network (PSTN) and/or Internet networks.

   (2) Shall not be for the exclusive use of any customer.

   (3) May also be used for telemetry, tracking, and command
   transmissions for the same NGSO FSS system.

   (4) May include multiple antennas, each required to meet the antenna
   performance standard in Sec. 25.209(h), located within an area of one
   second latitude by one second longitude.

   (5) Is considered as a separate gateway earth station complex if it is
   out side of the area of one second latitude by one second longitude of
   paragraph (4) of this definition, for the purposes of coordination
   with terrestrial services.

   Non-Voice, Non-Geostationary Mobile-Satellite Service. A
   mobile-satellite service reserved for use by non-geostationary
   satellites in the provision of non-voice communications which may
   include satellite links between land earth stations at fixed
   locations.

   1.6/2.4 GHz Mobile-Satellite Service. A mobile-satellite service that
   operates in the 1610-1626.5 MHz and 2483.5-2500 MHz frequency bands,
   or in any portion thereof.

   Passive satellite. An earth satellite intended to transmit radio
   communication signals by reflection.

   Protection areas. The geographic regions on the surface of the Earth
   where United States Department of Defense ("DoD") meteorological
   satellite systems or National Oceanic and Atmospheric Administration
   ("NOAA") meteorological satellite systems, or both such systems, are
   receiving signals from low earth orbiting satellites.

   Radiodetermination-Satellite Service. A radiocommunication service for
   the purpose of radiodetermination involving the use of one of more
   space stations. This service may also include feeder links necessary
   for its own operation. (RR)

   Satellite Digital Audio Radio Service ("DARS"). A radiocommunication
   service in which audio programming is digitally transmitted by one or
   more space stations directly to fixed, mobile, and/or portable
   stations, and which may involve complementary repeating terrestrial
   transmitters, telemetry, tracking and control facilities.

   Satellite system. A space system using one or more artificial earth
   satellites.

   Selected assignment. The term "selected assignment" means a spectrum
   assignment voluntarily identified by a 2 GHz MSS licensee at the time
   that the licensee's first 2 GHz mobile-satellite service satellite
   reaches its intended orbit, or other mobile-satellite service spectrum
   in which the Commission permits a 2 GHz mobile-satellite service
   licensee to conduct mobile-satellite service operations with authority
   superior to that of other in-band, mobile-satellite service licensees.

   Spacecraft. A man-made vehicle which is intended to go beyond the
   major portion of the Earth's atmosphere.

   Space operation service. A radiocommunication service concerned
   exclusively with the operation of spacecraft, in particular space
   tracking, space telemetry and space telecommand. These functions will
   normally be provided within the service in which the space station is
   operating.

   Space radiocommunication. Any radiocommunication involving the use of
   one or more space stations or the use of one or more reflecting
   satellites or other objects in space.

   Space station. A station located on an object which is beyond, is
   intended to go beyond, or has been beyond, the major portion of the
   Earth's atmosphere.

   Space system. Any group of cooperating earth stations and/or space
   stations employing space radiocommunication for specific purposes.

   Space telecommand. The use of radiocommunication for the transmission
   of signals to a space station to initiate, modify or terminate
   function of the equipment on a space object, including the space
   station.

   Space telemetering. The use of telemetering for the transmission from
   a space station of results of measurements made in a spacecraft,
   including those relating to the functioning of the spacecraft.

   Space tracking. Determination of the orbit, velocity or instantaneous
   position of an object in space by means of radiodetermination,
   excluding primary radar, for the purpose of following the movement of
   the object.

   Structural attenuation. The term "structural attenuation" means the
   signal attenuation caused by transmitting to and from mobile terminals
   which are located in buildings or other man-made structures that
   attenuate the transmission of radiofrequency radiation.

   Terrestrial radiocommunication. Any radiocommunication other than
   space radiocommunication or radio astronomy.

   Terrestrial station. A station effecting terrestrial
   radiocommunication.

   [ 30 FR 7176 , May 28, 1965, as amended at  36 FR 2562 , Feb. 6, 1971;  48 FR 40254 , Sept. 6, 1983;  51 FR 18445 , May 20, 1986;  54 FR 49993 , Dec.
   4, 1989;  56 FR 42706 , Aug. 29, 1991;  58 FR 68059 , Dec. 23, 1993;  59 FR 53329 , Oct. 21, 1994;  62 FR 11105 , Mar. 11, 1997;  62 FR 59296 , Nov. 3,
   1997;  65 FR 59143 , Oct. 4, 2000;  66 FR 10621 , Feb. 16, 2001;  67 FR 51114 , Aug. 7, 2002;  68 FR 11993 , Mar. 13, 2003;  68 FR 33650 , June 5,
   2003;  68 FR 34338 , June 9, 2003;  70 FR 4783 , Jan. 31, 2005]