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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SCDMA
IGMPv3-Controlled DOCSIS 3.0 IP Video
Release 8.0.x Features
The following is a list of the new features in Software Release 8.0.x:
24U CAM
IS-IS Multi-topology (MT) support
TFTP Enforce for IPv6-addressed Cable Modems
FQDN Support for IGMP Static Joins
Control of CM Resets due to CPE NAKs
Multicast CAC support for IP Video
Logical Channel Reduction
Enhanced Utilization Monitoring
The 24U CAM represents a new design using the latest DOCSIS 3.0 PHY and MAC silicon and enhanced ARRIS FPGAs for
high performance. The Upstream PICs have not changed from those used with the 12U CAM, so customers can deploy the
24U CAM with a minimum of cabling interruptions and allows the 24 upstream receivers to be shared across the eight
available F-connectors. The 2Dx12U CAM is not supported in Rel. 8.0.
Any F-connector can have between zero and 12 receivers assigned. The sum total of the receivers assigned to the even-
numbered F-connectors (0,2,4,6) cannot exceed 12, and the sum total of the receivers assigned to the odd-numbered F-
connectors (1,3,5,7) cannot exceed 12. Also, upstreams 0 to 11 must be on even-numbered connectors, and upstreams 12
to 23 must be on odd-numbered connectors.
Some other features of the 24U CAM with Release 8.0 include:
Up to 6,600 total subscriber devices per CAM
Up to 9+1 hitless RF sparing
All 24 channels support bonding (up to four channels per bonding group)
IS-IS Multi-topology (MT) provides independent topologies for IS-IS routing and is particularly useful when IS-IS is being
used both for IPv4 routing and for migration to IPv6 routing. In this software release, the C4 CMTS supports MT #0 (IPv4
unicast) and MT #2 (IPv6 unicast) as described in RFC 5120.