scope:

This standard specifies an interconnection method for attaching a cable Decoder (set back box) to a piece of consumer electronics equipment, such as a TV or VCR. Covered under this standard are two ports. An audio/video/control port is always required. An IF port is always required on the Receiver and may be required on the Decoder, depending on the application. The scope of this document extends to electrical and mechanical characteristics, and, for the control component of the interface, protocol and command set requirements. This standard specifies the physical characteristics of the interface between the Decoder and the Receiver. It is incomplete without IS 105.2, which specifies the control interface between the two devices.

The two documents IS105.1 and IS 105.2, describe a basic or so-called "level 1 " decoder. It is intended that a level 1 device will provide for interface between more than one Receiver and more than one Decoder, but will not offer the full functionality of the AVBUS interface. As described in IS 105.2, the Decoder may exchange commands with the Receiver using a rich command language set. However, the Decoder is not able to receive native remote control signals directly from the Receiver. It is anticipated that documents presently assigned the numbers IS105.3 and IS105.4 will describe a super set of IS 105.1 and -.2 functionality, to include full AVBus functionality and remote control pass-through.