C H A P T E R 1
Cisco uBR7225VXR Overview
This chapter describes the Cisco uBR7225VXR universal broadband router and contains the following sections:
•Cisco uBR7225VXR Universal Broadband Router, page 1-1
•Cisco uBR7225VXR Network Interface Overview, page 1-4
•Supported System Configurations Overview, page 1-6
•Hardware Component Descriptions, page 1-10
Cisco uBR7225VXR Universal Broadband Router
The Cisco uBR7200 series universal broadband routers, part of the Cisco Cable Modem Termination System (CMTS) solution, allows high-speed data services to be packaged similar to basic cable television service or video fare.
The router is based on Data-over-Cable Service Interface Specifications (DOCSIS) and supports data and packetized voice connectivity over a bidirectional cable television and IP backbone network. The Cisco uBR7200 series universal broadband routers typically concentrates traffic from DOCSIS- or EuroDOCSIS-based cable interfaces and cable modems (or set-top boxes with integrated DOCSIS or EuroDOCSIS cable modems) on the cable television network and presents that traffic to local and remote IP hosts. For cable plants not fully upgraded to support two-way cable transmission, the router works in conjunction with dial-up access products to support upstream traffic from DOCSIS-based cable interfaces connected to the Public Switched Telephone Network (PSTN). The router supports both 6-MHz North American channel plans using ITU-T J.83 Annex B operation and 8-MHz Phase Alternating Line (PAL) and SEquential Couleur Avec Memoire (SECAM) channel plans using ITU-T J.83 Annex A operation.
The Cisco uBR7200 series universal broadband routers contains some or all of the following:
•Cable interface line cards that interface to the cable television network. The Cisco uBR7225VXR card set includes varying upstream-to-downstream interface ratios with differing bandwidth and modulation schemes supported, as well as the capability to dynamically perform complex spectrum management and operate in a 6-MHz or 8-MHz channel width environment.
•One network processing engine (NPE) that performs system management functions for the chassis. See the “Network Processing Engine” section on page 1-10.
•The Cisco uBR7225VXR router supports an optional redundant power supply. See the “Power Supplies” section on page 1-13.
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
