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Glossary Terms Beginning T
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- T point
- See T-interface.
- ISDN terminal adapter: provides interface conversion between the S0 bus and
the serial communications interface on the subscriber data terminal equipment
- Bi-directional circuit to allow studio-remote conversations, instructions
and information to be exchanged, between the remote location and the control room
of the studio.
- Colloquial term for a single head shot of a reporter.
- Tape feed
- Video or audio tape transmission.
- Time division multiple access: refers to a form of multiple access where a
single carrier is shared by many users so that signals from earth stations reaching
the satellite consecutively are processed in time segments without overlapping.
- Fixed earth station; typically has a large number of satellite antennas.
- Transportable earth station: mobile microwave radio transmitter used in satellite
communications, including SNG systems.
- Point at which a signal will fail to be correctly demodulated: a digital receive
system will fail abruptly with either a 'frozen' or black picture when the input
signal fails to achieve threshold; an analogue system will suffer increasing degradation
to the point of failure the further below threshold the signal level drops.
- ISDN subscriber interface at the NT1.
- One thousand kilograms.
- Tracking, Telemetry and Control (or Command)
- Management of in-orbit satellite primary systems from the ground; sometimes
referred to as tracking, telemetry and command.
- Electronic device consisting of oscillator, modulator and other circuits which
produce an electromagnetic signal for radiation into the atmosphere by an antenna.
- Combination receiver, frequency converter and transmitter package, physically
on-board the satellite.
- Transport stream
- Multiplex of programme channels in a DVB system.
- Travelling wave tube
- TWT: powerful microwave amplifying vacuum tube used in a high-power amplifier,
commonly employed in SNG systems as well as on satellites.
- True North
- Theoretical North Pole: geographical designation of North Pole at 90°N latitude,
- See Tracking, telemetry and control (or command).
- Act of downlinking a satellite signal, altering it and instantaneously uplinking
it again; often used to provide a multi-hop path around the globe, or to change
the signal from Ku-band to C-band.
- System or installation provided complete and ready for operation by a manufacturer
- Television receive only: description of a small receive-only facility, using
a small antenna; in SNG often used for off-air check or cueing purposes.
- Engineering slang for adjustment to optimize performance.
- Studio-remote interview in a news broadcasts.
- Travelling wave tube.
- Transmit; transmission.
- Official process of obtaining technical approval for an earth station to be
used with a particular satellite system.