SSH EN 302 878-2 V1.1.1:2011

Access, Terminals, Transmission and Multiplexing (ATTM); Third Generation Transmission Systems for Interactive Cable Television Services - IP Cable Modems; Part 2: Physical Layer; DOCSIS 3.0

Scope

The present document is part of a series that defines the third generation of high-speed data-over-cable systems. This
series was developed for the benefit of the cable industry and includes contributions by operators and vendors from
North America, Europe and other regions.
There are differences in the cable spectrum planning practices adopted for different networks in the world. Therefore,
two options for physical layer technology are included, which have equal priority and are not required to be
interoperable. One technology option is based on the downstream multi-program television distribution that is deployed
in North America using 6 MHz channelling. The other technology option is based on the corresponding European
multi-program television distribution. Both 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 4 and 6, whereas the second is defined
by replacing the content of those clauses with the content of annex B. Correspondingly, [17] and [1] apply only to the
first option and [3] only to the second. Compliance with the present document requires compliance with the one or the
other of these implementations, not with both. It is not required that equipment built to one option will interoperate with
equipment built to the other.
These optional physical-layer technologies allow operators flexibility in mandated areas of operation, including any
frequency planning, EMC (electromagnetic compatibility) and safety requirements. For example, the 6 MHz
downstream based option defined in clauses 5 and 6 might be deployable within an 8 MHz channel plan. Compliance
with frequency planning and EMC requirements is not covered by this specification and remains the operators'
responsibility. In this respect, [13] and [14] are relevant to North America and [i.1], [5], [7], [8], [6], [9], [10] and [11]
are relevant to the European Union.
Backwards compatibility with earlier versions of that technology [12] is only ensured within the same technology
options referred to above and not between the two options.