Adtec digital mediaHUB-HD 422 (version 1.01.10_M_2) Manual User Manual
Page 98
PSI
Program Specific Information. PSI refers to MPEG-2 table data necessary for the demultiplexing of a
transport stream and the regeneration of programs within the stream, PSI tables include PAT, CAT, PMT
and NIT. PSIP - Program and System Information Protocol. The ATSC protocol for transmission of data
tables in the transport stream. Mandatory PSIP tables include MGT, STT, RRT, VCT and EIT.
PTS
Presentation Time Stamp. This stamp indicates the time at which an element in the transport stream must
be presented to the viewer. PTSs for audio and video are transmitted at least every 0.7 seconds. The PTS is
found in the PES header.
QAM
Quadrature Amplitude Modulation. This type of modulation for digital signals used in CATV transmission
(DVB-C). Amplitude and phase of a carrier are modulated in order to carry information.
QPSK
Quadrature Phase Shift Keying. A type of modulation for digital signals used in satellite transmission
(DVB-S).
RRT
Rating Region Table. An ATSC PSIP table that defines ratings systems for different regions or countries.
The table includes parental guidelines based on Content Advisory descriptors within the transport stream.
RS
Reed-Solomon Protection Code. This refers to the 16 bytes of error control that can be added to every
transport packet during modulation.
RST
Running Status Table. A DVB-SI table that indicates a change of scheduling information for one or more
events. It saves broadcasters from having to retransmit the corresponding EIT. This table is particularly
useful if events are running late. It is located on PID 0x0013.
SDT
Service Description Table. This DVB SI table describes the characteristics of available services. It is located
on PID 0x0011. Two types of SDTs are specified by DVB, the SDT Actual and the SDT Other. The SDT
Actual is a mandatory table that describes the services within the transport stream currently being accessed.
The SDT Other describes the services contained in other transport streams in they system.
SDTV
Standard Definition Television. SDTV refers to television that has a quality equivalent to NTSC or PAL.
Section
A syntactic structure used for mapping PSI/SI/PSIP tables into transport packets of 188 bytes.
Service
A collection of one or more events under the control of a single broadcaster. Also known as a Program.
SFN
Single Frequency Network (DVB-T).
SI
Service Information. This DVB protocol specifies all the data required by the receiver to demultiplex and
decode the programs and services in the transport stream. Mandatory DVB SI tables include TDT, NIT, SDT
and EIT. SMPTE - Society of Motion Picture and Television Engineers.
SNG
Satellite News Gathering. This refers to the retransmission of events using mobile equipment and satellite
transmission. SNMP - Simple Network Management Protocol. This is the standard protocol for system and
network administration.
SPI
Synchronous Parallel Interface. This is a standard DVB interface for a transport stream.
SPTS
Single Program Transports Stream. An MPEG-2 transport stream that contains one unique program.
ST
Stuffing Table. An optional DVB-SI table that authorizes the replacement of complete tables due to
invalidation at a delivery system boundary such as a cable headend. This table is located on PID 0x0014.
STB
Set-top box. A digital TV receiver (IRD).
STD
See System Target Decoder.
STT
System Time Table. An ATSC PSIP table that carries time information needed for any application requiring
schedule synchronization. It provides the current date and time of day and is located on PID 0x1FFB.
System Target
Decoder
A hypothetical reference model of the decoding process defined by MPEG-2.
Table
Service Information is transmitted in the form of tables, which are further divided into subtables, then into
sections, before being transmitted. Several types of tables are specified by MPEG, DVB and ATSC.
TDT
Time and Date Table. This mandatory DVB SI table supplies the time reference expressed in terms of UTC
time/date. This enables joint management of the events corresponding to the services accessible from a
single reception point. The PID for this table is 0x0014.
Time-stamp
An indication of the time at which a specific action must occur in order to ensure proper decoding and
presentation.
TOT
www.adtecdigital.com