ND SatCom SKYWAN IDU 7000 Manual page 146

Appendix C - Glossary
Term
Downlink
Digital Video
Broadcasting_Satellite
_Second Generation (DVB
S2)
Equivalent Isotropic Radi-
ated Power (EIRP)
Forward Error Correction
(FEC)
Footprint
Frame
Gain
Geostationary Earth Orbit
(GEO)
G/T
Guard Band
Home Channel (1,2)
Hub
Icon
Indoor Unit (IDU)
Inbound
142
Definition
Transmission of a signal from the satellite to the earth station.
Enhanced version of the DVB S satellite broadband transmis-
sion standard with forward error correction and modulation
specifications.
This term describes the strength of the satellite signal in dBW
and is a result of the transponder output power and the gain of
the satellite transmit antenna.
System for error control that has the sender to include redun-
dant data so errors can be detected and corrected at the re-
ceiver.
The area on the earth's surface that is covered by a satellite's
transmission beam.
Unit of transmission at the data link layer. A frame may include
a header and/or a trailer, along with some number of units of
data.
A measure of amplification expressed in dB.
Geostationary Earth Orbit satellites orbit at 35,786 km (22,282
mi) above the equator in the same direction and speed as the
earth rotates on its axis, making them appear as fixed in the
sky.
The figure of merit of an earth station or satellite transponder
expressed in dB/K. 'G' is the antenna gain and 'T' the system
noise temperature. The higher the G/T, the better the system.
Transmission carriers are separated on a transponder by
spacing them several kilohertz apart. This unused space
serves to prevent the adjacent transmission carriers from inter-
fering with each other.
Reception channels of a SkyWAN
Central station in a star or multi-star VSAT network.
Stands in the context of the SkyNMS Topology Manager appli-
cation for a graphical symbol.
VSAT network equipment typically located inside a building. It
consists of a modem and router connected to the corporate
LAN or terrestrial infrastructure. IDU or unit is the preferred
term when the physical aspects of a SkyWAN
treated (e.g. hardware).
In a VSAT network it is typically referred to as the transmission
from the remote station to a network hub.
Network Design and Engineering Guide
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2010-10-26