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ETSI TS 103 311-2
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ETSI TS 103 311-2 Integrated broadband cable telecommunication networks (CABLE); Fourth Generation Transmission Systems for Interactive Cable Television Services - IP Cable Modems; Part 2: Physical Layer; DOCSIS 3.1
standard by European Telecommunications Standards Institute, 02/01/2017
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ETSI TS 103 311-2 is part of a series of specifications that defines the fourth generation of high-speeddata-over-cable systems, commonly referred to as the DOCSIS 3.1 specifications. The present document was developedfor the benefit of the cable industry, and includes contributions by operators and vendors from North and SouthAmerica, 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 efficiencyand provide better scaling for larger bandwidths (and appropriate updates to the MAC and management layers tosupport the new PHY layer). It includes backward compatibility for the existing PHY layers in order to enable aseamless migration to the new technology.
There are differences in the cable spectrum planning practices adopted for different networks in the world. For the newPHY 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 needfor different region-specific physical layer technologies. Therefore, three options for physical layer technologies areincluded in the present document, which have equal priority and are not required to be interoperable. One technologyoption 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 thirdtechnology option is based on the corresponding Chinese multi-program television distribution. All three options havethe same status, notwithstanding that the document structure does not reflect this equal priority. The first of theseoptions is defined in clauses 5 and 6, whereas the second is defined by replacing the content of those sections with thecontent 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 thepresent document requires compliance with one of these implementations, but not with all three. It is not required thatequipment 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 theoperators' 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].