Ericsson SPR1100 Operations Instructions download pdf (Page 245)

Glossary

Analogue Color difference signals. Refer to C

for an explanation.

PROM 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: An Ericsson AB proprietary public-

key encryption system used to prevent unauthorized viewing of a TV

programme or programmes.

Reflex™ 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.

Radio Frequency.

RGB

Red, Green, Blue: The Chroma information in a video signal.

2/1553-

FGC 101 1400 Uen B

A-15

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Ericsson SPR1100 Operations Instructions Page 245

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