Selenio
TM
BNP User Guide, Release 3.7.1
273
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Q
QAM
Quadrature Amplitude Modulation. This is the modulation technique used in systems
carrying digital video.
QoS
Quality of Service. Guarantees network bandwidth and availability for applications.
R
RF
Radio Frequency. Television signals are modulated onto RF signals and are then
demodulated by the television tuner.
RTP
Real Time Protocol. RTP provides services such as payload type identification,
sequence numbering, time-stamping, and delivery monitoring to real-time
applications.
RU
Rack Unit. A common increment of equipment space height. The height of 1 RU is 1.75
inches.
S
PSI
Program Specific Information, as part of MPEG-2.
PSIP
Program and System Information Protocol. PSIP is a collection of nine tables that allow
the DTV transport stream to provide information about a station's services and
programming. These nine tables include:
Master Guide Table (
System Time Table (
Virtual Channel Table (VCT)
Rating Region Table (RRT)
Event Information Table (
Extended Text Table (
Data Event Table (
)
Directed Channel Change Table (
DCC Selected Code Change Table (
)
SAP
Secondary Audio Program. A way to provide a second audio channel within a TV
broadcast channel. Commonly used for stereophonic sound or bilingual audio tracks.
SCTE
Society of Cable Telecommunications Engineers. An organization that develops
training for cable television installers and engineers and standards for the cable
industry.
SD
Standard definition.
SFP
Small Form Factor Pluggable. An optical interface that is used in network switches for
Fibre Channel, Gigabit Ethernet and InfiniBand.
SNMP
Simple Network Management Protocol. A protocol used to monitor and control
network devices, and to manage configurations, statistics collection, performance, and
security.
SPTS
Single Program Transport Stream.
SSM
Source Specific Multicast. A way to deliver multicast packets whereby only packets
delivered to a receiver are those that have originated from a specific source IP address
that has been requested by the receiver.