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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TFTP Enforce for IPv6-addressed Cable Modems provides modem security for devices addressed via IPv6, identical to the
existing C4 CMTS functionality for IPv4 modems. The intent of this feature is to reduce or prevent occurrences in which an
IPv6-addressed modem has an incorrect or modified configuration file.
Fully Qualified Domain Name (FQDN) Support for IGMP Static Joins allows the IGMP join command in the C4 CLI to accept
an FQDN as the IP multicast source address, instead of requiring an IP multicast address. The DNS must then contain the
FQDN to IP address entry so that the CMTS can obtain the corresponding IP address from the FQDN parameter. Should the
source IP multicast address have to change, the MSO would change it on the DNS and the C4 CMTS will then resolve the
new address via DNS and re-initiate IGMP joins as needed.
Multicast CAC for IP Video (Phase 1) extends the existing voice-oriented Connection Admission Control function to
multicast service flows (intended for IP Video applications). Independent CAC control is provided for multicast flows, and
parameters for reserving bandwidth for multicast and for limiting the total bandwidth utilized by multicast are included.
Enhanced Processor Monitoring reports the utilization levels of the various microprocessors within the C4 CMTS modules
(the control plane). There is a new SNMP notification as part of the processor monitoring feature that will send traps when
the overload status of a card or the system changes.
Release 8.1.x Features
The following is a list of the new features in Software Release 8.1.x:
DSG 3.0
IPv6 Route Scaling Expansion – Phase 2
SCM 3
PacketCable 2.0 LAES
Syslog Support for IUA State Changes
D3.0 Load Balancing of Voice Bearer FLows Enhancement
Radius Authentication
ARP Reduction
DSG 3.0 adds support for the DOCSIS 3.0-based revisions to the DOCSIS Set-top Gateway (DSG) functionality that is
described in CM-SP-DSG-I19-111117. The C4 CMTS will tag DSG multicast tunnels with the appropriate DSID when
multicast DSID forwarding (MDF) is enabled.
IPv6 Route Scaling Expansion – Phase 2 adds additional capacity for PDRI.