Satellite Glossary
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DAMA (Demand-assigned Multiple Access)
A method of allocating variable time slots to users on demand. Idle channels are kept in a pool; when capacity is requested an idle channel is allocated the requested bandwidth and assigned to the user.
DBS (Direct Broadcast Satellite)
Satellite transmission of (typically) television programming to small dish antennas at consumers’ homes.
declination offset
In a polar mount, the adjustment that compensates for the apparent angle of satellites 22,245 miles above the equator from the latitude of the antenna.
decoder
Equipment for decompressing a compressed data stream.
decryption
The recovery of the original data from an encrypted file or signal.
Demand Assigned Multiple Access (DAMA)
Coordination of VSAT links among earth stations in the Thaicom Network to access the transponder based on actual usage requirements and according to demand. Users need not have permanent links. DAMA technology helps share transponder resources and efficient use of frequency spectrum as well as reducing space segment cost and inventory for users (a form of pay as you use)
demodulatio
The process of retrieving data from a modulated carrier wave; the opposite of modulation.
demultiplex
To separate a multiplexed data stream back into its original components.
digital
Data converted to numbers 0 and 1.
digital broadcasting
Converting TV pictures to numbers when transmitting and re-converting them to pictures when they are received.
digital compression
Squeezing digital information (like pictures or sound) into a smaller space to be able to transmit more quantity.
Digital Direct-to-Home (DTH)
Digital signals transmitted by Thaicom to a small satellite dish attached to a customer's television.
downlink
A satellite to ground link.
Digital Video Broadcast (DVB)
A technical standard for digital broadcasting.