TANDBERG TT1260 Reference Manual page 108

Glossary
SFN
SI
Single Packet Burst
Mode
Smart Card
SMATV
SMPTE
SMS
SNG
SNMP
Spatial Redundancy
SPI
Statistical Redundancy
TAXI
TCP / IP
TDM
TDT
Temporal Redundancy
Time stamp
Page A-12
Single Frequency Network: The SFN technique allows large geographic areas to be served
with a common transmission multiplex. All transmitters in the network are synchronously
modulated with the same signal and they all radiate on the same frequency. Due to the multi-
path capability of the multi-carrier transmission system (COFDM), signals from several
transmitters arriving at a receiving antenna may contribute constructively to the total wanted
signal. The SFN technique is not only frequency efficient but also power efficient because
fades in the field strength of one transmitter may be filled by another transmitter.
Service Information: Digital information describing the delivery system, content and
scheduling (timing) of broadcast data streams. DVB-SI data provides information to enable
the IRD to automatically demultiplex and decode the various streams of programmes within
the multiplex.
Specified in ISO/IEC 13818[1]. (DVB)
A burst of ASI bytes (either 188 or 204, depending on packet length) is contiguously grouped
into an MPEG-2 Transport Stream packet. Stuffing data is added between the packets to
increase the data rate to 270 Mbit/s. See DVB Document A010 rev. 1, Section B3.3, (ASI)
Layer-2 Transport Protocol.
A plastic card with a built-in microprocessor and memory used for identification, financial
transactions or other authorising data transfer. When inserted into a reader, data is
transferred to and from the host machine or a central computer. It is more secure than a
magnetic stripe card and it can be disabled if the wrong password is entered too many times.
As a financial transaction card, it can be loaded with digital money and used in the same way
as cash until the balance reaches zero. The file protocol is specific to its intended application.
Satellite Mast Antenna Television: A distribution system, which provides sound and
television signals to the households of a building or group of buildings, typically used to refer
to an apartment block.
Society of Motion Picture and Television Engineers.
Subscriber Management System: A system which handles the maintenance, billing, control
and general supervision of subscribers to conditional access technology viewing services
provided through cable and satellite broadcasting.
An SMS can be an automatic (e.g. Syntellect) system where subscribers order entitlements
by entering information via a telephone. Alternatively, an SMS can be a manual system, which
requires subscribers to speak with an operator who then manually enters their entitlement
requests. Some systems support multiple SMSs.
Satellite News-Gathering.
Simple Network Management Protocol.
Information repetition due to areas of similar luminance and/or chrominance characteristics
within a single frame. Removed using DCT and Quantisation (Intra-Frame Coding).
Synchronous Parallel Interface.
Data tables are used to assign fewer bits to the most commonly occurring events, thereby
reducing the overall bitrate. Removed using Run Length Coding and Variable Length Coding.
Transparent Asynchronous Tx / Rx Interface: A proprietary high-speed data interface.
Transmission Control Protocol/Internet Protocol: A set of communications protocols that
may be used to connect different types of computers over networks.
Time Division Multiplex: One common, communications channel carrying a number of
signals, each with its own allotted time slot.
Time and Date Table: Part of the DVB Service Information. The TDT gives information
relating to the present time and date.
Information repetition due to areas of little or no movement between successive frames.
Removed using motion estimation and compensation (Inter-Frame Coding).
A term that indicates the time of a specific action such as the arrival of a byte or the
presentation of a presentation unit.
Reference Guide: TT1260 Contribution Receiver
ST.RE.E10100.3