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2010-10-26
Appendix C - Glossary
SkyNMS Network
Management PC
A PC on which the SkyNMS software is installed and running.
The PC is locally connected to a
Sky
WAN
®
IDU over the Eth-
ernet port.
Sky
WAN
®
Channel
occupies frequency bandwidth on a satellite transponder for a
Sky
WAN
®
network; is configurable by SkyNMS.
Sky
WAN
®
Station
Ground equipment that transmits and receives electromagnet-
ic waves in a
Sky
WAN
®
network.
Sky
WAN
®
ND SatCom
Sky
WAN
®
is an MF-TDMA VSAT system that
supports voice, video and data applications in the most band-
width- and cost-effective manner. Main functionality is provid-
ed by the
Sky
WAN
®
IDU series.
Spot Beam
A spot beam is a satellite signal that covers a concentrated ge-
ographic area so only antennas in that area will receive the sig-
nal.
Star network
VSAT topology whereby a remote location communicates with
another remote location by routing through a hub
Symbol Rate
Also known as baud or modulation rate is the number of sym-
bol changes (signalling events) made to the transmission me-
dium per second using a digitally modulated signal or a line
code. Often used modulation techniques in VSAT communica-
tions are QPSK and 8PSK.
Time Division Multiple Ac-
cess (TDMA)
Channel access method that allows applications or users to
share the same frequency by dividing the full bandwidth into
specific timeslots.
Transponder
A combination of receiver, frequency converter, and transmit-
ter package, physically part of a communications satellite.
Uplink
Transmission of a signal from an earth station to a satellite.
See also Downlink.
VSAT
Very Small Aperture Terminal is a station with an antenna that
is typically less than 3 meters in diameter.
X Band
Frequency band with uplink 7.9 to 8.4 GHz, downlink 7.25 to
7.75 GHz. This band is primarily used for military communica-
tions systems.
8-PSK
8-PSK phase shift modulation involves eight levels of phase
shift and encodes three bits per symbol. See also QPSK and
Symbol Rate.
Term
Definition
Содержание SKYWAN IDU 7000
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