Advantech L-Band Satellite Modulator Installation And Operation Manual page 85

Term
JPEG
kbit/s
Kbit
Ku-band
LAN
L-Band
LCD
LED
Link Budget
LNA
LNB
LNBF
LO
LVDS
M&C
SBM75e Series Modulator Installation and Operation Manual
Description
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).
1000 bits per second.
1024 bits, usually refers to memory capacity or allocation.
ITU-defined frequency range from 12 GHz to 18 GHz. Used by
communications satellites, this range of frequency is less susceptible to
interference.
Local Area Network: A network, which provides facilities for
communications within a defined building or group of buildings in close
proximity.
ITU-defined frequency range from 950 MHz to 2150 MHz. The normal
input-frequency-range of a domestic IRD. The incoming signal from the
satellite is down-converted to L-band by the LNB.
Liquid Crystal Display. A thin, flat display device made up of any number
of colour or monochrome pixels arrayed in front of a light source or
reflector. Often utilized in battery-powered electronic devices because it
uses very small amounts of electric power.
Light Emitting Diode. A semiconductor diode that emits light when an
electric current is applied in the forward direction of the device.
The accounting of all of the gains and losses from the transmitter,
through the medium (free space, cable, waveguide, fiber, etc.) to the
receiver in a telecommunication system. It accounts for the attenuation
of the transmitted signal due to propagation, as well as the antenna
gains, feedline and miscellaneous losses. Randomly varying channel
gains such as fading are taken into account by adding some margin
depending on the anticipated severity of its effects. The amount of
margin required can be reduced by the use of mitigating techniques
such as antenna diversity or frequency hopping.
Low-Noise Amplifier: A component of a dish antenna that amplifies the
weak signals received from a satellite (or microwave transmitter). It is
often located very close to, or on, the antenna (immediately behind the
feed horn) so that further losses, due to the signal travelling down the
feed line, are minimised.
Low-Noise Block Down-Converter: A combination of Low Noise Amplifier
(LNA) and a Block Down-Converter (BDC) usually mounted on a dish
antenna to enable it to amplify and downconvert the received signal to
a suitable frequency to communicate to a Receiver, Demodulator or IRD
(typically L-BAND 950 MHz - 1600 MHz).
Low-Noise Block Down-Converter and Feed: A combination of Low Noise
Amplifier, Block Down-Converter and Feed, mounted on a dish antenna.
Local Oscillator.
Low Voltage Differential Signal: LVDS is a generic multi-purpose Interface
standard for high speed / low power data transmission. It was
standardised in ANSI/TIA/EIA-644-1995 Standard (aka RS-644).
Monitor and Control.
Glossary
B-7