scope:

The present document provides the ETSI endorsement of ANSI/SCTE standard ANSI/SCTE 262-1 [1].

ANSI/SCTE 262-1 is part of a series of standards that defines the sixth generation of high-speed data-over-cable systems and is based on a set of specifications commonly referred to as DOCSIS 4.0 specifications. This generation of the DOCSIS specifications builds upon the previous generations of DOCSIS specifications (commonly referred to as the DOCSIS 3.1 and earlier specifications), leveraging the existing Media Access Control (MAC) and Physical (PHY) layers. It includes backward compatibility for the existing PHY layers in order to enable a seamless migration to the new technology. Further, the DOCSIS 4.0 specifications introduce Full Duplex (FDX) DOCSIS PHY layer technology as an expansion of the OFDM PHY layer introduced in the DOCSIS 3.1 PHY specification to increase upstream capacity without significant loss of downstream capacity versus DOCSIS 3.1. The DOCSIS 4.0 specification also builds upon DOCSIS 3.1 OFDM and OFDMA technology with an extended Frequency Division Duplex (FDD) DOCSIS alternative. DOCSIS 4.0 FDD supports legacy high split and also provides extended splits up to 684 MHz in an operational band plan which is referred to as Ultra-High Split (UHS). DOCSIS 4.0 FDD also introduces expansion of usable downstream spectrum up to 1 794 MHz. Both the FDX and FDD DOCSIS 4.0 alternatives are based on OFDM PHY.

There are differences in the cable spectrum planning practices adopted for different networks in the world. For the OFDM PHY layer defined in the present document, there is flexibility to deploy the technology in any spectrum plan; therefore, no special accommodation for different regions of the world is required for this PHY layer.

However, due to the inclusion of the DOCSIS 3.0 PHY layers for backward compatibility purposes, there is still a need for different region-specific physical layer technologies. Therefore, three options for physical layer technologies are included in the present document, which have equal priority and are not required to be interoperable. One technology option is based on the downstream channel identification plan that is deployed in North America using 6 MHz spacing. The second technology option is based on the corresponding European multi-program television distribution. The third technology option is based on the corresponding Chinese multi-program television distribution. All three options have the same status, notwithstanding that the document structure does not reflect this equal priority. The first of these options is defined in clauses 5 and 6 of [i.1], whereas the second is defined by replacing the content of those clauses with the content of Annex C of [i.2]. The third is defined by replacing the content of those clauses with the content of Annex D of [i.2]. Correspondingly, [13] and [i.3] apply only to the first option, and [4] applies to the second and third. Compliance with the present document requires compliance with one of these implementations, but not with all three. It is not required that equipment built to one option interoperates with equipment built to the other.

Compliance with frequency planning and EMC requirements is not covered by the present document and remains the operators' responsibility. In this respect, [10] and [11] are relevant to the USA; [3] and [i.4] to Canada; [i.6], [5], [6], [7], [8] and [9] are relevant to the European Union; [12] and [i.5] are relevant to China.

ANSI/SCTE 262-1 [1] defines the interface for the physical layer, and corresponds to the CableLabs specification CM-SP-PHYv4.0-I02-200429 [i.1].