 In the late 1980s, several similar specifications, including the "Domestic Digital Bus (D2B)", the "Japanese Home Bus (HBS)",
and the "European Home System (EHS)" are proposed by different companies or organizations.These were once discussed as IEC 61030,
but it was withdrawn in 2006.IEBus is also a similar specification (refer to "Transfer signal format" section), but not listed in this criteria.