ETSI TS 103 311-2是定义第四代高速列车的一系列规范的一部分 电缆系统上的数据，通常称为DOCSIS 3.1规范。本文件是编写的 为了电缆行业的利益，包括来自北方和南方的运营商和供应商的贡献 美国、欧洲和亚洲。这一代DOCSIS规范建立在前几代DOCSIS规范的基础上 （通常称为DOCSIS 3.0和早期规范），利用现有的媒体访问控制 （MAC）和物理（PHY）层，但添加了一个新的PHY层，旨在提高频谱效率 并为更大的带宽提供更好的可扩展性（以及对MAC和管理层的适当更新，以 支持新的物理层）。它包括现有PHY层的向后兼容性，以便启用 无缝迁移到新技术。世界上不同网络采用的电缆频谱规划实践存在差异。为了新的 在本文件中定义的物理层中，可以灵活地在任何频谱计划中部署该技术；因此 这种新的物理层不需要为世界不同地区提供特殊的调节。然而，由于包含了DOCSIS 3.0物理层以实现向后兼容性，仍然需要 针对不同地区的特定物理层技术。因此，物理层技术有三种选择: 包括在本文件中，它们具有同等的优先权，不需要互操作。一项技术 该选项基于在北美部署的下游信道识别计划，使用6 MHz间隔。 第二种技术选择基于相应的欧洲多节目电视发行。第三个 技术选项基于相应的中国多节目电视发行。这三个选项都有 同样的地位，尽管文件结构没有反映这种同等的优先权。第一个 第5条和第6条对选项进行了定义，而第二条的定义是将这些章节的内容替换为 附录C的内容。第三个定义是用附录D的内容替换这些章节的内容。 相应地，[18]和[2]仅适用于第一个选项，[8]适用于第二个和第三个选项。遵守 本文档要求符合其中一种实现，但不符合所有三种实现。不要求 一个选项的设备应与另一个选项的设备互操作。 本文档不包括对频率规划和EMC要求的遵从性，这仍然是最重要的 运营商的责任。在这方面，[14]和[15]与美国有关；[1] 以及[i.5]加拿大；[7], [9], [10], [11] [12]和[13]与欧盟有关；[16] [i.4]与中国有关。本文件定义了物理层的接口，并与CableLabs规范[i.8]相对应。

ETSI TS 103 311-2 is part of a series of specifications that defines the fourth generation of high-speed data-over-cable systems, commonly referred to as the DOCSIS 3.1 specifications. The present document was developed for the benefit of the cable industry, and includes contributions by operators and vendors from North and South America, Europe and Asia.This generation of the DOCSIS specifications builds upon the previous generations of DOCSIS specifications (commonly referred to as the DOCSIS 3.0 and earlier specifications), leveraging the existing Media Access Control (MAC) and Physical (PHY) layers, but with the addition of a new PHY layer designed to improve spectral efficiency and provide better scaling for larger bandwidths (and appropriate updates to the MAC and management layers to support the new PHY layer). It includes backward compatibility for the existing PHY layers in order to enable a seamless migration to the new technology.There are differences in the cable spectrum planning practices adopted for different networks in the world. For the new 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 new 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, whereas the second is defined by replacing the content of those sections with the content of Annex C. The third is defined by replacing the content of those sections with the content of Annex D. Correspondingly, [18] and [2] apply only to the first option, and [8] apply 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 shall interoperate 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, [14] and [15] are relevant to the USA; [1] and [i.5] to Canada; [7], [9], [10], [11], [12] and [13] are relevant to the European Union; [16] and [i.4] are relevant to China.The present document defines the interface for the physical layer, and corresponds to the CableLabs specification [i.8].