Ericsson AVP 4000, Reference Manual, Page: 356 / 422

Glossary
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ISDN Integrated Services Digital Network: The basic ISDN service is BRI
(Basic Rate Interface), which is made up of two 64 kbps B channels
and one 16 kbps D channel (2B+D). If both channels are combined
into one, called bonding, the total data rate becomes 128 kbps and
is four and a half times the bandwidth of a V.34 modem (28.8 kbps).
The ISDN high speed service is PRI (Primary Rate Interface). It
provides 23 B channels and one 64 kbps D channel (23B+D), which
is equivalent to the 24 channels of a T1 line. When several channels
are bonded together, high data rates can be achieved. For example,
it is common to bond six channels for quality videoconferencing at
384 kbps. In Europe, PRI includes 30 B channels and one D
channel, equivalent to an E1 line.
ISO International Standards Organisation.
ISOG
Inter-union Satellite Operations Group.
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.
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.