Ericsson SVP 2000, Справочное руководство, Страница: 164 / 196

Glossary
ITS Insertion Test Signal: A suite of analogue test signals placed on
lines in the VBI. Also known as VITS.
ITT Invitation To Tender.
ITU-R International Telecommunications Union - Radiocommunications
Study Groups (was CCIR).
ITU-T International Telecommunications Union - Telecommunications
Standardization Sector (was CCITT).
JPEG Joint Photographic Experts Group: ISO/ITU standard for
compressing still images. It has a high compression capability.
Using discrete cosine transform, it provides user specified
compression ratios up to around 100:1 (there is a trade-off between
image quality and file size).
kbps 1000 bits per second.
Kbit 1024 bits, usually refers to memory capacity or allocation.
KLV Key-Length-Value, data encoding standard defined in SMPTE
336M-2007. Key identifies the data, length specifies the data length,
and value is the data itself.
Ku-band The portion of the electromagnetic spectrum, which spans the
frequency range of approximately 12 GHz to 14 GHz. Used by
communications satellites. Preferred for DTH applications because
this range of frequency is less susceptible to interference.
LAN Local Area Network: A network, which provides facilities for
communications within a defined building or group of buildings in
close proximity.
L-band The frequency band from 950 MHz to 2150 MHz, which is the
normal input-frequency-range of a domestic IRD. The incoming
signal from the satellite is down-converted to L-band by the LNB.
LED Light Emitting Diode.
LNB Low Noise Block Down-Converter: The component of a subscriber
satellite transmission receiving dish which amplifies the incoming
signal and down-converts it to a suitable frequency to input to the
IRD (typically 950 MHz - 1600 MHz).
LO Local Oscillator.
lsb Least significant bit.
Luminance The television signal representing brightness, or the amount of light
at any point in a picture. The Y in YC
R
C
B.
LVDS Low Voltage Differential Signal: LVDS is a generic multi-purpose
Interface standard for high speed / low power data transmission. It
was standardized in ANSI/TIA/EIA-644-1995 Standard (aka RS-
644).
EN/LZT 790 0046/1 R1A A-10