Troubleshooting guide

7-3
Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 7 Troubleshooting the CMTS
Physical Interfaces
HFC interfaces are provided by up to 4 plug-in modem cards. A variety of modem cards are supported,
including UBR-MC11C, UBR-MC12C, UBR-MC14C, UBR-MC16C, and UBR-MC16S. All the cable
modem cards have one downstream cable port. The number of upstream cable ports vary with the type
of card. For example MC16C has 6 upstream ports.
The MC16S has spectrum managemnent support. The spectrum manager continuously monitors the
noise in unused upstream channels. If the signal-to-noise ratio reaches an unacceptable level on a
particular channel, the spectrum manager will automatically assign a new upstream channel to the cable
modem using that channel (frequency agility).
The Cisco uBR 7246VXR comes equipped with one 100 Base-T Ethernet interface built into the I/O
board. Another RJ-45 100 Base-T Ethernet card can be installed via a plug-in port adapter.
• Gigabit Ethernet
• Multi-port Ethernet/Fast Ethernet
• Packet Over Sonet (POS) interfaces (long reach, intermediate reach, multimode)
• 2 port OC-12 DPT ports (long reach, intermediate reach, multimode)
• High-speed backplane (622 Mbps)
Features
The operating system for the Cisco uBR7246VXR is the Cisco IOS software that resides in Flash
memory. The unit includes the following features:
Management Features
The Cisco uBR7246VXR enables easy setup and service using the following:
• HTML based management tool
• Web browser can be used to navigate through CLI commands
• Simple Network Management Protocol (SNMP) v3
• Works with configuration tools, such as Cisco Network Registrar (CNR), and Cisco Subscriber
Registration Center (CSRC)
• MIB support—RF interface MIB, DOCSIS extensions MIB
• Redundancy provided by n+m configuration
Routing, Security, and QoS Features
The Cisco uBR7246VXR provides support for the following:
• HSRP
• Network Address Translation (NAT), Access Control Lists (ACLs), and Committed Access Rate
(CAR)
• Traffic shaping
• VPNs, GRE tunnels
• TAG switching support on cable interfaces (VPN)