Glossary
SMATV
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.
SMPTE
Society of Motion Picture and Television Engineers.
SMS
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.
SNG
Satellite News-Gathering.
SNMP
Simple Network Management Protocol.
SNTP
Simple Network Time Protocol is an Internet protocol used to
synchronize the clocks of computers to some time reference. It is a
simplified version of the protocol NTP protocol which is too
complicated for many systems.
Spatial Redundancy
Information repetition due to areas of similar luminance and/or
chrominance characteristics within a single frame. Removed using
DCT and Quantization (Intra-Frame Coding).
SPI
Synchronous Parallel Interface.
Statistical
Redundancy
Data tables are used to assign fewer bits to the most commonly
occurring events, thereby reducing the overall bit rate. Removed
using Run Length Coding and Variable Length Coding.
TCP / IP
Transmission Control Protocol/Internet Protocol: A set of
communications protocols that may be used to connect different
types of computers over networks.
TDM
Time Division Multiplex: One common, communications channel
carrying a number of signals, each with its own allotted time slot.
TDT
Time and Date Table: Part of the DVB Service Information. The TDT
gives information relating to the present time and date.
Temporal
Redundancy
Information repetition due to areas of little or no movement between
successive frames. Removed using motion estimation and
compensation (Inter-Frame Coding).
Time stamp
A term that indicates the time of a specific action such as the arrival
of a byte or the presentation of a presentation unit.
TNS
Temporal Noise Shaping.
TOT
Time Offset Table: This optional SI table supports the use of local
offsets as well as the UTC time/date combination. The purpose of
the table is to list by country the current offset from UTC and the
next expected change to that offset (to track when daylight saving
occurs). The offset resolution is to within 1 minute over a range of
±12 hours from UTC.
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