CI/CI+ – Description

Common Interface has two logical interfaces, to be included on the same physical interface. The first interface is the MPEG-2 Transport Stream Interface as defined in the MPEG-2 specifications. The second interface, the Command Interface, carries commands between the host and the CAM.

  • The CI Software allows implementation of Command Interface, which includes:
  • – CAM configuration
  • – Exchange of commands between STB and Conditional Access Module (CAM).
  • A DVB PCI card or DVB set-top-box (STB) consists of the following main hardware components:
  • – Front-end consisting of tuner and DVB demodulator
  • – The front-end down-converts and demodulates this signal into an MPEG transport stream (TS).
  • – Conditional Access (CA) hardware like CI adapters and smart card slots
  • – The complete TS is passed through the CA hardware. Programs to which the user has access (controlled   by the smart card) are decoded in real time and re-inserted into the TS.
  • – De-multiplexer, which filters the incoming DVB stream
  • – MPEG2 audio and video decoder
  • – The main targets of the de-multiplexer are the MPEG2 audio and video decoders.