ITU-T J.224 PDF

This Recommendation specifies the fifth generation of high-speed data-over-cable systems. Fifth generation transmission systems introduce a number of new features that build upon what was present in previous ITU-T Recommendations, namely [b-ITU-T J.112], [b-ITU-T J.122], [b-ITU-T J.222.x] and [b-ITU-T J.223.x] listed in Appendix I. This Recommendation includes key new features for the physical (PHY) layer and establishes full duplex (FDX) and frequency division duplex (FDD) data-over-cable service interface specification (DOCSIS) modes of operation, including enhancements to the media access control (MAC) layer protocols, as well as requirements for those in the upper layer, e.g., the Internet protocol (IP) and dynamic host configuration protocol (DHCP). Fifth generation cable modem specifications fully incorporate those of the fourth generation. [b-ITU-T J-Sup.10] records the correspondence between DOCSIS specifications and ITU-T Recommendations.