§  15.703   Definitions.

   (a) Available channel. A television channel which is not being used by
   an authorized user at or near the same geographic location as the TVBD
   and is acceptable for use by an unlicensed device under the provisions
   of § 15.709. A TVBD determines television channel availability either
   from the TV bands database or spectrum sensing.

   (b) Client device. A TVBD operating in client mode.

   (c) Client mode. An operating mode in which the transmissions of the
   TVBD, including frequencies of operation, are under control of the
   master device. A device in client mode is not able to initiate a
   network.

   (d) Fixed device. A TVBD that transmits and/or receives
   radiocommunication signals at a specified fixed location. Fixed TVBDs
   may operate as part of a system, transmitting to one or more fixed
   TVBDs or to personal/portable TVBDs.

   (e) Geo-location. The capability of a TVBD to determine its geographic
   coordinates within a specified level of accuracy.

   (f) Master device. A TVBD operating in master mode.

   (g) Master mode. An operating mode in which the TVBD has the capability
   to transmit without receiving an enabling signal. The TVBD is able to
   select a channel itself based on a list provided by the database and
   initiate a network by sending enabling signals to other devices. A
   network always has at least one device operating in master mode.

   (h) Mode I operation. Operation of a personal/portable TVBD operating
   only on the available channel identified by either the fixed TVBD or
   Mode II TVBD that enables its operation. Mode I operation does not
   require use of a geo-location capability or access to the TV bands
   database and requires operation in client mode.

   (i) Mode II operation. Operation of a personal/portable TVBD whereby
   the device determines the available channels at its location using its
   own geo-location and TV bands database access capabilities. Devices
   operating in Mode II may function as master devices.

   (j) Network initiation . The process by which a fixed or Mode II TVBD
   sends control signals to another similar device or to a client
   device(s) and allows them to begin transmissions.

   (k) Operating channel . An available channel used by a TVBD for
   transmission and/or reception.

   (l) Personal/portable device . A TVBD that transmits and/or receives
   radiocommunication signals while in motion or at unspecified locations
   that may change.

   (m) Receive site . The location where the signal of a full service
   station is received for rebroadcast by a television translator or low
   power TV, including Class A TV, station.

   (n) Spectrum sensing . A process whereby a TVBD monitors a television
   channel to detect whether the channel is occupied by a radio signal.

   (o) Television band device (TVBD) . Intentional radiators operating on
   available channels in the broadcast television frequency bands at 54–60
   MHz, 76–88 MHz, 174–216 MHz, 470–608 MHz and 614–698 MHz.

   (p) TV bands database . A database of authorized services in the TV
   frequency bands that is used to determine the available channels at a
   given location for use by TVBDs.