Chapter 14: Cable-side Configuration
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 388
Several parameters of the MAC domain.
The association of each downstream and each logical upstream to the MAC domain.
DOCSIS 3 Terminology
Terminology that is common to DOCSIS 3.0 is defined in the following table:
Table 55. DOCSIS 3.0 Terms
Cable Modem Service
Group (CM-SG)
A service group may contain channels from multiple C4/c CMTSs, and therefore the SG
may contain portions of multiple CM-SGs. The CM-SG is the portion of a service group’s
channels that is managed from a single C4/c CMTS.
The CM-SG is also an important DOCSIS 3.0 concept, but it is not directly used or
represented in the C4/c CMTS provisioning.
A Fiber Node can terminate one or more downstream carrier paths from the head-end
and originates one or more upstream reverse carrier paths to the head-end. The FN
connects the upstream and downstream signals from the fiber onto numerous coaxial
cable segments.
a
All upstream and downstream channels of an C4/c CMTS must be assigned to the C4/c
CMTS logical subcomponent called the MAC domain. A MAC domain manages both a
group of channels, and the types of service that are carried on the channels.
A service group may contain channels from multiple MAC domains to allow separate
channels for different services. For example, residential data versus business data.
A cable modem uses channels from and communicates with only one MAC domain at a
time.
MAC Domain Cable
Modem Service
Group (MD-CM-SG)
A cable modem can only operate on channels that are part of the same MAC Domain. The
subset of a CM-SG’s channels which are confined to a single MAC domain is called a MAC
domain cable modem service group (MD-CM-SG).
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