C H A P T E R
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Cisco uBR905 Router Hardware Installation Guide
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Product Overview
This chapter describes the Cisco uBR905 cable access router and its interaction with the Cable Modem
Termination System (CMTS)—the cable system headend equipment that provides Internet (TCP/IP)
connectivity for subscribers over the cable broadband infrastructure. The chapter provides physical and
functional overviews of the Cisco uBR905 cable access router and its supported operating modes.
This chapter provides the following information about the Cisco uBR905 cable access router:
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Overview of the Cisco uBR905 Cable Access Router, page 1-1
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Physical Description, page 1-5
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Functional Overview, page 1-10
For information on configuring the Cisco uBR905 cable access router, see the Cisco uBR905 Cable
Access Router Software Configuration Guide, available on CCO and the Documentation CD-ROM.
Overview of the Cisco uBR905 Cable Access Router
This section provides an overview of the Cisco uBR905 cable access router, its hardware, and its basic
operation:
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Introduction
The Cisco uBR905 cable access router functions at its most basic level as a cable modem—a
modulator/demodulator that provides high-speed network access on the cable television system to
residential and small office/home office (SOHO) subscribers. The Cisco uBR905 router uses the cable
system’s existing physical plant to provide Internet and other wide area network (WAN) connectivity
over the service provider’s Hybrid/Fiber Coax (HFC) cable system.
The router is based on the Data-over-Cable Service Interface Specifications (DOCSIS), a standard
developed with service providers to ensure that any DOCSIS-certified cable modem can interoperate
with any bidirectional, DOCSIS-qualified CMTS. The DOCSIS standard also sets required levels of
performance and reliability for the cable network.
Note
Information about DOCSIS requirements and current specifications are available at the
CableLabs web site at http://www.cablelabs.com.
