Triple-Play Service Deployment

Glossary
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 the 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.
SI Service Information. A DVB protocol that specifies all data required by the receiver
to de-multiplex and decode the programs and services in the transport stream.
Mandatory DVB SI tables include TDT, NIT, SDT, and EIT.
Single Mode Fiber An optical wave guide (or fiber) in which the signal travels in one mode.
SLA Service Level Agreement
SMPTE Society of Motion Picture and Television Engineers
SNG Satellite News Gathering. Refers to the retransmission of events using mobile
equipment and satellite transmission.
SNMP Simple Network Management Protocol. The standard protocol for system and
network administration.
SNR Signal to Noise Ratio. The ratio of the received optical signal power divided by the
RMS noise floor for the detector.
Softswitch Device in a telephone network which connects one phone line to another entirely
through software
SONET Synchronous Optical NETwork. A transport interface that enables the public
network to carry services. SONET is the North American optical fiber standard that
supports transmission rates that start at 51.84 Mb/s and reach to 2.488 Gb/s.
SPI Synchronous Parallel Interface. A standard DVB interface for a transport stream.
Splice A permanent junction between optical fibers.
Splitter (Optical) A passive device which devises optical power among several output fibers from a
common input.
Splitter A device used in DSL to allow continued use of POTS or ISDN services while at the
same time supporting a DSL technology on the same copper pair or loop.
SPTS Single Program Transport Stream. An MPEG-2 transport stream that contains one
unique program.
SRA Seamless Rate Adaptation. ADSL2 feature enabling the system to change data rate
while in operation without any service interruption or bit errors.
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