TANDBERG TT1260 Reference Manual page 98

Glossary
TSDT
TSP
TVCT
U
UART
UHF
Upconvert
Uplink
UPS
UTC
VCT
VHF
VITC
VITS
VPS
WSS
WST
XILINX
Y (Luminance)
Page A-10
Transport Stream Descriptor Table: A component of the MPEG-2 PSI data. This table describes which type of
Transport stream it is in (i.e. DVB, ATSC etc.). It may also contain other descriptors.
Transport Stream Processor.
Terrestrial Virtual Channel Table (ATSC).
44.45 mm (rack height standard).
Universal Asynchronous Receiver Transmitter: A device providing a serial interface for transmitting and
receiving data.
Ultra High Frequency: A portion of the electromagnetic spectrum covering 300 MHz to 3000 MHz (3 GHz).
The process by which the frequency of a broadcast transport stream is shifted to a higher frequency range.
The part of the communications satellite circuit that extends from the Earth to the satellite.
Uninterruptable Power Supply: A method of supplying backup power when the electrical power fails or drops to
an unacceptable voltage level. Small UPS systems provide battery power for a few minutes; enough to power
down the computer in an orderly manner. This is particularly important where write back cache is used.
Write back cache is where modified data intended for the disk, is temporarily stored in RAM and can be lost in the
event of a power failure. Sophisticated systems are tied to electrical generators that can provide power for days.
UPS systems typically provide surge suppression and may provide voltage regulation.
Universal Time Co-ordinate: An internationally agreed basis for timekeeping introduced in 1972 and based on
international atomic time (corresponds to Greenwich Mean Time or GMT).
Virtual Channel Table (ATSC).
Very High Frequency: A portion of the electromagnetic spectrum covering 30 MHz to 300 MHz.
Vertical Interval Time Code.
Vertical Interval Test Signal: See: ITS.
Video Programming System: A German precursor to PDC
Wide Screen Switching: Data used in wide-screen analogue services, which enables a receiver to select the
appropriate picture display mode.
World System Teletext: System B Teletext. Used in 625 line / 50 Hz television systems (ITU-R 653).
A type of programmable Integrated Circuit.
Defines the brightness of a particular point on a TV line. The only signal required for black and white pictures.
Reference Guide: TT1260 Contribution Receiver
ST.RE.E10100.1