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 ‘?eve1 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.