This Recommendation is in the family of ITU-T Rec. J.112. Its purpose is to provide a technology through which the demand for symmetrical services on cable networks can be met. This second generation technology, while using the same RF channel, is backward compatible with that of ITU-T Rec. J.112. It provides a significant increase in upstream channel capacity with wider channels, higher symbol rate and increased spectral efficiency. It provides for both Synchronous-CDMA and Advanced-TDMA coding and also adds higher order modulation capabilities. It is more robust with regard to noise immunity and provides greater multipath protection than the technology used in ITU-T Rec. J.112.