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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02
Chapter 1 Cisco uBR7225VXR Overview
Supported System Configurations Overview
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Telco return cable interfaces transmit over the PSTN. Dial-up servers and other equipment
handle the upstream traffic and pass appropriate data to the Cisco uBR7225VXR routers. For
telco return specifics, refer to the “Telco Return” section on page 1-9.
Figure 1-4 shows the architecture of a typical two-way hybrid fiber-coaxial (HFC) network, equipped to
support two-way data communication.
Figure 1-4 Two-Way HFC Cable Network Example
Cisco provides a configuration tool—Cisco Network Registrar (CNR)—which is optimized for high
performance automatic dynamic IP address allocation to cable interfaces, PCs, and other devices on the
broadband network. Cisco also provides an integrated suite of configuration tools, including CNR, for
relatively large cable networks called Cisco Subscriber Registration Center (CSRC). CSRC allows
large-scale configuration and management of broadband modems. Leveraging the extensibility of CNR,
CSRC enables and administers subscriber self-registration. The directory-enabled architecture of CSRC
allows it to integrate with Lightweight Directory Access Protocol (LDAP) version 3 directory servers.
For more information on CSRC and CNR involvement in the cable network, refer to the CSRC and CNR
documentation.
Cisco Network Registrar Install and Upgrade Guide at the following URL:
http://www.cisco.com/en/US/products/sw/netmgtsw/ps1982/prod_installation_guides_list.html
Cisco Subscriber Registration Centre Installation Guide at the following URL:
http://www.cisco.com/en/US/products/sw/netmgtsw/ps2181/products_installation_guide_chapter09186
a0080086f1a.html
Also refer to the Cisco uBR7200 Series Software Configuration Guide at the following URL:
http://www.cisco.com/en/US/docs/cable/cmts/ubr7200/configuration/guide/cr72scg.html
Over the air
channels
Satellite
channels
Internet
Headend / Hub
Receivers
Descramblers
Scramblers
RF combiner
Subscriber
cable modem
Optical node
Optical node
Optical node
AM & digital
modulators
Optical transmitter
Optical transmitter
Optical transmitter
Optical receiver
RF amplifiers
271650
Cisco
uBR7225VXR
RF
RF RF
RF
RF
RF
Tap
Upstream
RF
Downstream
RF
10Base-T