Ericsson RX8000 Series Reference Manual page 199

P
R
PROM
PS
PSI
PSIP
PSK
PSR
PSU
QAM
QoS
QPSK
QSIF
Quantise
RAM
RAS
RF
RGB
RIP2
EN/LZT 790 0005 R1A
P Analogue Colour difference signals. Refer to C
B
explanation.
Programmable Read-Only Memory: A device, which may be written
once with data for permanent storage, and then read whenever
required. Special types of PROM permit the erasure of all data by
Ultraviolet light (EPROM) or by application of an electronic signal
(EEPROM).
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: A Ericsson AB proprietary public-key
encryption system used to prevent unauthorized viewing of a TV
programme or programmes.
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.
Annex A
C for an
R B
A-15