Appendix C - Glossary - ND SatCom SKYWAN IDU 7000 Manual

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APPENDIX C - GLOSSARY

Term
Antenna
Backup Master
Bandwidth
Beam
Bit Rate
Binary Phase Key Shifting
(BPSK)
Block Up Converter (BUC)
Burst
Carrier to Noise Ratio
(C/N)
C band
Container
Coverage
Cross Strapped Trans-
ponder
Datagram
dBW
Double Hop
2010-10-26
Definition
For satellite communication over geosynchronous satellites
parabolic reflector antennas are used.
A slave station that is ready in terms of hardware, software and
configuration to take over the role of a master station. See also
Master Station.
A range of frequencies within a spectrum, expressed in Hertz.
Also used for the data transfer rate or throughput, expressed
in bits per second.
Radio transmission focused into a certain direction in order to
achieve a high power density in that direction.
Speed of transmission, measured in bits per second (bps).
Modulation scheme that uses two phases separated by 180
degrees.
Used for transmission towards the satellite (uplink); converts
from a lower frequency to a higher frequency using a fixed os-
cillator frequency.
A short transmission over the satellite link. The burst time is
smaller than the time slot.
The ratio of the received carrier power and the noise power in
a given bandwidth expressed in dB. The higher the C/N the
better the quality.
Frequency band with uplink 5.925 to 6.425 GHz, downlink 3.7
to 4.2 GHz.
Part of a data burst reserved for user traffic.
Footprint or the area on the earth's surface that is covered by
a satellite's transmission beam.
A bent pipe transponder with uplink and downlink coverage lo-
cated in different areas, e.g. uplink in Europe, downlink in USA.
See also Transponder.
Unit of transmission in the network layer (such as IP). A data-
gram may be encapsulated in one or more packets passed to
the data link layer.
The ratio of the power to one Watt expressed in decibels. Typ-
ically the EIRP of satellite beams are measured in dBW.
Transmission of information from one terminal to another ter-
minal in two stages via an intermediate hub station. Typical for
star networks.
Network Design and Engineering Guide
Appendix C - Glossary
141