The scope of this Recommendation is to define a globally common specification for framing structure@ channel coding and modulation schemes for television@ sound and data services including high quality broadcast and multicast services for downstream distributed through hybrid fibre coax (HFC) based networks to provide high spectral efficiency. This Recommendation will contribute to the development of common products for cable broadcast and telecommunication downstream physical layer (PHY). The specifications included in this Recommendation are based on the requirements defined in [ITU-T J.381].