DiSEqC

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DiSEqC
DiSEqC logo, indicating DiSEqC 2.0 compliance
Developed byEutelsat
Introduced1977 (1977)
2-way DiSEqC switch
4-way DiSEqC switch with attached coaxial cables.

DiSEqC (

antenna rotor. DiSEqC was developed by European satellite provider Eutelsat
, which now acts as the standards agency for the protocol.

History

Eutelsat apparently developed the system to allow satellite users in

Digibox
name. All supporting receivers have received certification to carry a logo specifying which variation of DiSEqC they support.

Protocol

DiSEqC relies only upon a

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. DiSEqC is also compatible with the actuators used to rotate large C band dishes if used with a DiSEqC positioner. DiSEqC uses a pulsed (tone-burst) 22 kHz sine-wave at 0.65 V (± 0.25 V)[2]
peak to peak.

The "Di" (digital) part of the name refers to the digital nature of the signals used by the protocol and does not imply anything about the transmission that the dish is used to receive; DiSEqC may be used with both digital and analogue satellite systems.

Versions and compatibility

A number of versions of DiSEqC exist:

  • DiSEqC 1.0, which allows switching between up to 4 satellite sources
  • DiSEqC 1.1, which allows switching between up to 16 sources
  • DiSEqC 1.2, which allows switching between up to 16 sources, and control of a single axis satellite motor
  • DiSEqC 2.0, which adds bi-directional communications to DiSEqC 1.0
  • DiSEqC 2.1, which adds bi-directional communications to DiSEqC 1.1
  • DiSEqC 2.2, which adds bi-directional communications to DiSEqC 1.2
  • DiSEqC 3.0, which adds remote management of receivers to DiSEqC 2.2 to enable broadcast house uses

First four variations were standardized by February 1998, prior to general use of digital satellite television. The later versions are backwards compatible with the lower revisions, but the lower revisions are, as might be expected, not forwards compatible with the higher revision numbers. 1.x and 2.x versions are both backwards and forwards compatible.

The terms DiSEqC 1.3 and 2.3 are also often used by manufacturers and retailers to refer to the use of DiSEqC with other protocols. For example, 1.3 usually refers to a receiver which uses USALS in conjunction with the DiSEqC 1.2 protocol. Such terminology has not been authorised by Eutelsat.

The following table shows compatibility between the various DiSEqC versions:

1.0 switch 1.1 switch 1.2 motor 2.0 switch 2.1 switch 2.2 motor 3.0 receiver 3.0 antenna-side
1.0 receiver Yes No No Yes No No Yes No
1.1 receiver Yes Yes No Yes Yes No Yes No
1.2 receiver Yes Yes Yes Yes Yes Yes Yes No
2.0 receiver Yes No No Yes No No Yes No
2.1 receiver Yes Yes No Yes Yes No Yes No
2.2 receiver Yes Yes Yes Yes Yes Yes Yes No
3.0 broadcast house No No No No No No Yes Yes
3.0 antenna-side Yes Yes Yes Yes Yes Yes Yes Yes

NOTE: a 1.x receiver will not be able to receive communication from a switch or motor. Usually this is not important, as the switch or motor can be controlled by the receiver without problems.

See also

Notes

  1. ^ The maximum dish size that can generally be used with a DiSEqC motor is 1.2m; however, using a V-box as in interface, DiSEqC 1.2 can be used for very large dishes using 36V motors.
  2. ^ "Digital Satellite Equipment Control (DiSEqC) Bus Functional Specification (Version 4.2)" (PDF). Eutelsat. 1998-02-25. Retrieved 2012-04-18.

External links


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