Satellite Communications Glossary

Demand-assigned multiple access (DAMA).  In demand-assigned multiple access (DAMA) in satellite communications, the available channels are allocated on an as-required basis to users. When the user is finished with the channel it is relinquished and made available for another user.

Descending Node.  The descending node of the orbit is the point where the orbit crosses the equatorial plane going from north to south.

Direct-broadcast Satellite Service (DBS).  Broadcasting Satellite Services (BSS) or Direct-broadcast Satellite Service (DBS) networks transmit broadcast and television signals from a large central Earth station, via a satellite to relatively simple receive-only Earth stations.

DirecTV dish network.  Topics in the Satellite Communications Glossary related to DirecTV dish network are: Satellite broadcasting, Foxtel Satellite Dish, DirecTV Satellite, Satellite TV dish, Broadcast satellite, Sky Satellite Receiver, HD satellite TV, Free Satellite, Foxtel Satellite Receiver, DirecTV Satellite Dish, Foxtel Satellite, DirecTV Satellite Receiver, Sky Satellite Dish, Sky Satellite, Satellite TV receiver.

DirecTV Satellite.  DirecTV is a satellite television system that operates primarily in North America.

DirecTV Satellite Dish.  A DirecTV satellite dish antenna is used to receive DirecTV signals.

DirecTV Satellite Receiver.  A DirecTV satellite receiver takes the signal from a DirecTV satellite dish.

DISH DVR.  Other entries related to DISH DVR include: DISH network satellite TV, Satellite DISH network, Direct-broadcast Satellite Service, DISH receiver, DISH network receiver, DISH network DSL.

DISH network.  Other entries related to DISH network include: DISH network satellite TV, Satellite DISH network, Direct-broadcast Satellite Service, DISH receiver, DISH network receiver, DISH DVR, DISH network DSL.

DISH network DSL.  Topics in the Satellite Communications Glossary related to DISH network DSL are: DISH network satellite TV, Satellite DISH network, Direct-broadcast Satellite Service, DISH receiver, DISH network receiver, DISH DVR.

DISH network receiver.  Other entries related to DISH network receiver include: DISH network satellite TV, Satellite DISH network, Direct-broadcast Satellite Service, DISH receiver, DISH DVR, DISH network DSL.

DISH network satellite TV.  Other entries related to DISH network satellite TV include: Satellite DISH network, Direct-broadcast Satellite Service, DISH receiver, DISH network receiver, DISH DVR, DISH network DSL.

DISH receiver.  DISH receiver is related to other topic areas in the Satellite Communications Glossary: DISH network satellite TV, Satellite DISH network, Direct-broadcast Satellite Service, DISH network receiver, DISH DVR, DISH network DSL.

Doppler Effect.  The Doppler effect in satellite communications is the change in frequency of an electromagnetic signal that results from the relative speed of the satellite and the Earth terminal.

Down converter.  A down converter translates a carrier frequency from a high frequency to a low frequency.

Downlink.  The downlink in satellite communications is the signal from the satellite transponder to a satellite Earth station.

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