Chapter 14: Cable-side Configuration
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 416
However, all DOCSIS 3.0 CMs are capable of using non-primary-capable downstreams for any type of data service that they
can provide.
Configure Primary Capability
To configure a downstream channel as primary capable, enter:
configure interface cable-downstream <s/p> cable primary-capable [no]
An example of the command:
configure interface cable-downstream 12/0 cable primary-capable
Service Group Determination and Display
Once channels have been assigned to both the MAC Domain and the fiber nodes, the C4/c CMTS can automatically assign
group IDs to channels based upon common HFC plant connection topology.
MAC Domain
Each MAC domain independently defines its own:
MD-CM-SGs
MD-DS-SGs
MD-US-SGs
As a result, different MAC Domains that reach the same set of fiber nodes may have channels that are split/combined in a
manner such that the channel grouping boundaries do not match up. These groupings can then be used by the C4/c CMTS
to determine the channels that are available for each fiber node (and ultimately each CM) to use.
Modem and Service Group Association
A modem is associated with a MD-CM-SG at the time of initial modem ranging. The modem stores the MD-CM-SG-ID as
well as the fiber node's name that is associated with the MD-CM-SG. The ID and name are included in the show cable
modem detail output. A modem’s MD-CM-SG-ID (which is shown as mCMsg in CLI outputs) is also the fiber node’s MD-CM-
SG-ID when the modem registers.
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