Chapter 2: C4/C4c CMTS Features
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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FlexPath DOCSIS 3.0-based Channel Bonding Enhancements
Enhanced Query Modem Counts on a per Upstream Basis
DOCSIS Set-top Gateway Configuration Simplification
Source IP Configuration for CM Remote Query
DHCP Lease Query Feature Configurability
Automatic Gain Control
The 5.1 enhancements to the FlexPath channel bonding solution include the following:
3 bonded downstreams x 3 traffic-bearing unbonded upstreams
2 bonded downstreams x 2 traffic-bearing unbonded upstreams
4 bonded downstreams x 1 traffic-bearing unbonded upstream plus 3 non-traffic-bearing upstreams for return
path of DOCSIS management messages
Optional designation of upstream channels as FlexPath only
The Enhanced Query Modem Counts feature provides a CLI command--show cable modem summary brief--that offers
modem totals on a per-upstream basis. The total number of modems calculated per upstream includes registered,
unregistered, and offline modems.
DOCSIS Set-top Gateway (DSG) Configuration Simplification performs the automatic insertion of static multicast group
memberships and the automatic insertion of multicast MAC/IP bindings when configuring DSG tunnels.
Source IP Configuration for CM Remote Query allows the user to configure the IP address used for remote SNMP to get
queries to any valid C4 IP address.
DHCP Lease Query Feature Configurability adds a source IP address verification phase to the IP address learning process of
the C4 CMTS. This configurable Cable Source Verify feature is intended to eliminate host- initiated corruption of the layer 2
and layer 3 address spaces on the cable network.
Automatic Gain Control uses an improved downstream power calibration algorithm on the 2Dx12U in order to maintain
accurate downstream power levels in environments subject to fluctuating temperatures.
Note: QAM128 and Trellis Code Modulation (TCM) are not supported in Release 5.1. SCDMA is supported.