Ericsson RX8000 PSI, PSK, PSR, PSU, QAM, QoS, RAM, RAS, RGB, PRPB, PROM, PSIP, QPSK, QSIF, RIP2, Quantise

Annex A

PRPBPROM

Analogue Colour difference signals. Refer to CRCB for an 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).

PS	Program Stream: A combination of one or more PESs with a
	common timebase.
PSI	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).
PSIP	Program System Information Protocol: The ATSC equivalent of SI
	for DVB.
PSK	Phase Shift Keying: A method of modulating digital signals
	particularly suited to satellite transmission.
PSR	Professional Satellite Receiver: See also: IRD.
PSU	Power Supply Unit.
QAM	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.
QoS	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.
QPSK	Quadrature Phase Shift Keying: A form of phase shift keying
	modulation using four states.
QSIF	Quarter Screen Image Format.
Quantise	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.
RAM	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.
RAS	Remote Authorization System: A Ericsson AB proprietary public-key
	encryption system used to prevent unauthorized viewing of a TV
	programme or programmes.
RF	Radio Frequency.
RGB	Red, Green, Blue: The Chroma information in a video signal.
RIP2	Routing Information Protocol v2. A protocol used between network
	routers to exchange routing tables and information.

EN/LZT 790 0005 R1A A-15