DiSEqC pronounced "Die-Sec", is a special communication protocol for use between a satellite

Satellite

In the context of spaceflight, a satellite is an object which has been placed into orbit by human endeavour. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon....

 receiver

Receiver (radio)

A radio receiver converts signals from a radio antenna to a usable form. It uses electronic filters to separate a wanted radio frequency signal from all other signals, the electronic amplifier increases the level suitable for further processing, and finally recovers the desired information through...

 and a device such as a multi-dish switch

Switch

In electronics, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another....

 or a small dish antenna rotor. DiSEqC was developed by European satellite provider Eutelsat

Eutelsat

Eutelsat S.A. is a French-based satellite provider. Providing coverage over the entire European continent, as well as the Middle East, Africa, India and significant parts of Asia and the Americas, it is one of the world's three leading satellite operators in terms of revenues.Eutelsat’s satellites...

, which now acts as the standards agency for the protocol.

DiSEqC relies only upon a coaxial

Coaxial

In geometry, coaxial means that two or more forms share a common axis; it is the three-dimensional linear analogue of concentric.Coaxial cable, as a common example, has a wire conductor in the centre a circumferential outer conductor and an insulating medium called the dielectric separating...

 cable to transmit both bidirectional

Bidirectional

The term "bidirectional" may refer to:*Anything that can move in two directions*A roadway that carries traffic moving in opposite directions*A tram or train or any other vehicle that can be controlled from either end and can move forward or backward with equal ease without any need to be turned...

 data

Data

The term data refers to qualitative or quantitative attributes of a variable or set of variables. Data are typically the results of measurements and can be the basis of graphs, images, or observations of a set of variables. Data are often viewed as the lowest level of abstraction from which...

/signals and power. DiSEqC is commonly used to control switches and motors, and is more flexible than 13/18 volt and 22 kHz tone or ToneBurst/MiniDiSEqC techniques.