Ericsson AVP 1000 Reference Manual page 411

P P
R
PS
PSI
PSIP
PSK
PSR
PSU
QAM
QoS
QPSK
QSIF
Quantise
RAM
RAS
Reflex™
RF
RGB
RIP2
EN/LZT 790 0023/1 R16A
Analogue Color difference signals. Refer to C
B
Program Stream: A combination of one or more PESs with a
common timebase.
Program Specific Information: Consists of normative data, which is
necessary for the de-multiplexing of transport streams and the
successful regeneration of programs (see also: SI).
Program System Information Protocol: The ATSC equivalent of SI
for DVB.
Phase Shift Keying: A method of modulating digital signals
particularly suited to satellite transmission.
Professional Satellite Receiver: See also: IRD.
Power Supply Unit.
Quadrature Amplitude Modulation: A method of modulating digital
signals, which uses combined techniques of phase modulation and
amplitude modulation. It is particularly suited to cable networks.
Quality of Service. A common term for a set of parameters
describing the quality you get from an IP network: Throughput,
availability, delay, jitter and packet loss.
Quadrature Phase Shift Keying: A form of phase shift keying
modulation using four states.
Quarter Screen Image Format.
A process of converting analogue waveforms to digital information.
8-bit quantization as set out in ITU-R Rec. 601. Uses 256 levels in
the range 0 – 255 to determine the analogue waveform value at any
given point. The value is then converted to a digital number for
processing in the digital domain.
Random Access Memory: A volatile storage device for digital data.
Data may be written to, or read from, the device as often as
required. When power is removed, the data it contains is lost.
Remote Authorization System: An Ericsson AB proprietary public-
key encryption system used to prevent unauthorized viewing of a TV
programme or programmes.
An Ericsson AB proprietary system to provide efficient use of
bandwidth by a set of encoders without sacrificing picture quality. A
group bit rate is allocated to a set of Encoders and the bit rate for
each encoder is allocated according to the requirements of the
picture encoding process.
The bit rate allocation can be performed externally by a multiplexer,
or internally in a unit fitted with multiple VCM's.
Radio Frequency.
Red, Green, Blue: The Chroma information in a video signal.
Routing Information Protocol v2. A protocol used between network
routers to exchange routing tables and information.
Glossary
C for an explanation.
R B
A-15