Ericsson AVP 4000, Reference Manual, Page: 364 / 422

Glossary
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Smart Card A plastic card with a built-in microprocessor and memory used for
identification, financial transactions or other authorizing 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.
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).