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SDTI
SELV
SFP
SIP
STB
SFN
SI
Single Packet Burst
Mode
Smart Card
EN/LZT 790 0005 R7A
Serial Data Transport Interface. A mechanism that allows
transmission of various types of data over an SDI signal. This may
be one or more compressed video signals or other proprietary data
types. The advantage of SDTI is that existing SDI transmission
infrastructure can be used to transport other types of data.
Safety Extra Low Voltage (EN 60950).
Small Form-factor Pluggable module. A standardized mechanism to
allow usage of various optical interfaces for Gigabit Ethernet.
Several types of SFP modules exist: Single-mode fiber modules for
long-distance transmission and multi-mode fiber modules for shorter
distances. SFP is also known as "mini-GBIC".
Session Initiation Protocol. A common acronym for the ongoing
effort to standardize signaling over IP networks, i.e. connection
set-up and tear-down. SIP makes it possible to "dial" a remote
receiver of data and set-up the connection in this way.
Set-Top Box: A box that sits on top of a television set and is the
interface between the home television and the cable TV company.
New technologies evolving for set-top boxes are video-on-demand,
video games, educational services, database searches, and home
shopping. The cable equivalent of the IRD.
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 Mbps. 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 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.
Glossary
A-17
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