This Recommendation "Transmission systems for interactive cable television services" extends the scope of Recommendation J.83 "Digital multi-programme systems for television, sound and data services for cable distribution" to make provision for bidirectional data over hybrid fibre-coax cables for interactive services. Like Recommen-dation J.83, this Recommendation also contains several annexes in recognition of different existing media environments. The annexes in this Recommendation are intended to be read in conjunction with the corresponding annexes in Recommendation J.83.