Digital Satellite Equipment Control (DiSEqC) is a communication protocol standard used to connect satellite receivers to devices like an antenna rotor from a small dish or a multi-dish switch. DiSEqC allows more channels within a specific frequency bandwidth by transmitting channels with horizontal or vertical polarization.
Eutelsat, a European satellite service provider, developed DiSEqC and is now the protocol’s standard agency.
DiSEqC uses coaxial cables to transmit bi-directional information, two-way signals, and power. It is mainly used to manage motors and switches.
DiSEqC messages are transmitted in a series of rapid bursts (22KHz tone) adjusted by the coax cable power supply from the input on the receiver. Messages are digital bytes comprised of eight bits.
- DiSEqC 1.0 – allows switching among a maximum of 4 satellite sources;
- DiSEqC 1.1 – allows switching among a maximum of 16 satellite sources;
- DiSEqC 1.2 – allows switching among a maximum of 16 satellite sources, and controls a horizontally panning satellite motor;
- DiSEqC 2.0 – adds bi-directional communication to DiSEqC 1.0;
- DiSEqC 2.1 – adds bi-directional communication to DiSEqC 1.1; and
- DiSEqC 2.2 – adds bi-directional communication to DiSEqC 1.2
The system was apparently created by Eutelsat to allow Continental European users to shuttle between the SES Astra 1 satellite block and Eutelsat’s HotBird system. Majority of Europe’s satellite receivers now support DiSEqC version 1.0 upwards. All receivers supporting Eutelsat’s standard are now certified to use the DiSEqc logo indicating the version that they support.
DiSEqC 1.3 and 2.3 are often used by retailers and manufacturers to identify DiSEqC used with other protocols. Eutelsat, however, does not authorize such terminology.