Troubleshooting guide

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Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 1 Solution Overview
Solution Components
Cisco uBR7246VXR CMTS
In the BLISS for Cable solution the CMTS is a Cisco Universal Broadband Router, uBR7246VXR,
which integrates a CMTS with a Cisco7200 series router allowing it to terminate IP packets on its
network interface. This enables the Cisco uBR7246VXR to connect cable modems on the Hybrid
Fiber Coaxial (HFC) Cable network using Cisco MCxx cable modem cards. The modem cards
provide the interface between the Cisco uBR7246VXR protocol control information (PCI) bus and
the radio frequency (RF) signal on the DOCSIS HFC network.
The Cisco7200 router portion of the Cisco uBR7246VXR is based on the NPE-400 Network
Processing Engine (NPE) which provides over 100 Kpps (kilo packets per second) of fast switching
capability, or the newly available NPE-1G NPE. The chassis is fully radio frequency (RF) hardened
to ensure noise-free transmission, and all major components are hot swappable to guarantee
maximum reliability. The Cisco uBR7246VXR supports a broad set of residential and commercial
multiservice offerings, including IP telephony, multicast, streaming media, and Virtual Private
Network (VPN) applications.
The Cisco uBR7246VXR supports 1+1 and N+1 redundancy of the complete line of DOCSIS™
1.0-qualified and DOCSIS™ 1.1-based modem cards, including both cable and wireless cards. A
range of network interfaces is available, including Fast Ethernet, SONET, and the Cisco Dynamic
Packet Transport (DPT) port adapters, which provide direct, high-speed optical connectivity
combined with add-drop multiplexer capability.
Cisco uBR10012 CMTS
The Cisco uBR10012 Universal Broadband Router delivers the industry's highest-capacity CMTS
and integrated router. The Cisco uBR10012 resides on the edge of the network in a balanced system
that employs a mix of distributed, centralized, and parallel processing. Parallel eXpress Forwarding
(PXF) provides consistently high performance and sophisticated IP decision-making capabilities,
while protecting investment and providing a software re-programmable architecture.
The Cisco uBR10012 enables cable service providers to deliver feature-rich, high-speed data, voice,
and video services to very high subscriber penetrations, typically 10,000 to 25,000 subscribers per
chassis. Using Cisco IOS® Software, the product delivers a comprehensive suite of DOCSIS™ and
high-speed IP services that includes DOCSIS™ 1.1 quality of service (QoS), access control lists,
and Multiprotocol Label Switching (MPLS). The Cisco uBR10012 enables service providers to
deploy a wide variety of value-added services.
For more information on the Cisco uBR7246VXR or the Cisco uBR10012, see Chapter 7,
“Troubleshooting the CMTS.”
• Fiber-Optic Laser Transmitters and Receivers—If the downstream channels of your cable plant
originate at the headend over fiber-optic lines, ensure you have a fiber-optic laser transmitter
allocated for each downstream channel in your network. If the upstream channels of your cable plant
terminate at the headend over fiber-optic lines, ensure that you have a fiber-optic laser receiver
allocated for each upstream channel in your network.
Note Laser transmitters and receivers need to be properly tuned so that the frequency of their output
signal matches the transmit or receive frequency of the downstream or upstream channel on the
Cisco uBR7246VXR router with which they have been paired.