Specifications

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Appendix C - Glossary

8 APPENDIX C - GLOSSARY

Term Definition

Antenna For satellite communication over geosynchronous satellites

parabolic reflector antennas are used.

Backup Master 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.

Bandwidth A range of frequencies within a spectrum, expressed in Hertz.

Also used for the data transfer rate or throughput, expressed

in bits per second.

Beam Radio transmission focused into a certain direction in order to

achieve a high power density in that direction.

Bit Rate Speed of transmission, measured in bits per second (bps).

Binary Phase Key Shifting

(BPSK)

Modulation scheme that uses two phases separated by 180

degrees.

Block Up Converter (BUC) Used for transmission towards the satellite (uplink); converts

from a lower frequency to a higher frequency using a fixed os-

cillator frequency.

Burst A short transmission over the satellite link. The burst time is

smaller than the time slot.

Carrier to Noise Ratio

(C/N)

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.

C band Frequency band with uplink 5.925 to 6.425 GHz, downlink 3.7

to 4.2 GHz.

Container Part of a data burst reserved for user traffic.

Coverage Footprint or the area on the earth's surface that is covered by

a satellite's transmission beam.

Cross Strapped Trans-

ponder

A bent pipe transponder with uplink and downlink coverage lo-

cated in different areas, e.g. uplink in Europe, downlink in USA.