IEC 61603-1 specifies general requirements and methods of measurement for equipment using infrared radiation as a carrier of information. This part of IEC 61603 specifies requirements and methods of measurement for analogue video transmission systems which are not covered by IEC 61603-1, nor by other standards. It allows systems which make different economic use of the available bandwidth to be described in order for conclusions regarding interference and compatibility to be drawn Note: for detail of audio transmission systems see IEC 61603-2