Cisco Systems UBR7225VXR

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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide

OL-17309-02

Chapter4 Connecting the Cisco uBR7225VXR Router to the Cable Headend

Measuring the Upstream RF Signal

Figure4-38 Vector Signal Analyzer Plot of Upstream Data Burst (Preamble Only)—Digital

Demodulation Mode

Note Before moving on to Step3, be sure to hook your spectrum analyzer back up to the upstream signal

source.

Step3 On your spectrum analyzer, narrow both the resolution and video bandwidth to 1MHz. You will notice

that the preamble of the signal has dropped in amplitude, yielding a spectrum analyzer display similar

to the one in Figure4-39.

Contents

Main Page CONTENTS Page Page Page Page Page Preface Document Revision History Document Objectives Audience Document Organization Document Conventions Warning Definition Obtaining Documentation and Submitting a Service Request Cisco uBR7225VXR Overview Cisco uBR7225VXR Universal Broadband Router Page Cisco uBR7225VXR Router Chassis Cisco uBR7225VXR Network Interface Overview Card Slot and Logical Interface Numbering 1 2 3 4 5 8 7 6 MAC-Layer Address Supported System Configurations Overview Basic Internet Access Services Page VPN Services IP Telephony Services Telco Return Hardware Component Descriptions Network Processing Engine NPE Comparisons Cisco Cable Interface Line Cards Power Supplies Fan Trays Page Page Cisco uBR7225VXR Chassis Subchassis and Midplane Cisco uBR7225VXR Subchassis CompactFlash Disk Page Page Preparing the Cisco uBR7225VXR Router for Installation Safety Recommendations Lifting the Cisco uBR7225VXR Router Safely Safety with Electricity Preventing Electrostatic Discharge Damage Site Requirements AC Power Site Environment Site Configuration: Maintaining Normal Operation General Precautions Power Considerations Required Network Information Before You Begin Installation Tools Rack-Mount and Cable-Management Kit Equipment Required to Verify Your Plants RF Setup Shipping Container Contents Verifying the Shipping Container Contents Provisioning the Cable Headend Two-Way Data and VoIP Headend Certification Diplex Filters Receivers DHCP, DNS, TFTP, and TD Servers Telco Return Dial-Up/Remote Access Servers RADIUS Dial Security Servers Authentication, Authorization, and Accounting Servers VoIP Gateways and Gatekeepers VoIP SGCP Pass-Through Headend Wiring Interference Considerations Distance Limitations and Interface Specifications Equipment Racks Page Site Preparation Checklist Component Checklists Installing the Cisco uBR7225VXR Router Cisco uBR7225VXR Router Installation Checklist Cisco uBR7225VXR Router Chassis Rack-Mounting Options Page Page Cable-Management Bracket Requirements Page Installing the Brackets on the Chassis Installing Rack-Mount Brackets on the Rear of the Chassis Installing Rack-Mount Brackets on the Front of the Chassis Installing Rack-Mount Brackets in the Middle of the Chassis Installing the Chassis in the Rack Page Installing the Chassis in a Workbench or Tabletop Environment Cabling Connecting Cable Interface Line Card Cables Console and Auxiliary Port Connection Equipment Console Port Signals Auxiliary Port Signals Protective Grounding Connecting Power Connecting to the AC-Input Power Supply Powering On the Cisco uBR7225VXR Router Configuring the Interfaces Page Connecting the Cisco uBR7225VXR Router to the Cable Headend 4-2 Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide Two-Way Data Headend Architecture Figure4-1 Typical Cable Headend Configuration for Two-Way Data uBR7225VXR One-Way Data Headend Architecture RF and Digital Data Overview Connecting and Configuring the Downstream Installing and Configuring the Upconverter Measuring the Downstream RF Signal Measuring the Downstream RF Signal Using the Channel Power Option on a Spectrum Analyzer Measuring the Downstream IF Signal at the Cisco uBR7225VXR Router Page Measuring the Downstream RF Signal at the Upconverter Output Page Page Page Measuring the Downstream RF Signal Using CATV Mode on a Spectrum Analyzer Measuring the Downstream IF Signal at the Cisco uBR7225VXR Router Using CATV Mode Page Page Measuring the Downstream RF Signal at the Upconverter Output Using CATV Mode Page Page Page Connecting and Configuring the Upstream Connecting the Upstream to the Optical Receiver 4-19 Figure4-22 Connecting and Configuring the Upstream Figure4-23 The X-level Test Point Testing the Upstream Configuration 4-20 Diplex filter Figure4-24 Calibrating Multiple X-level Test Points Connected to One Upstream Port Cable modem LH C 4-21 Figure4-25 Calibrating Multiple X-level Test Points Connected to Multiple Upstream Ports Measuring the Upstream RF Signal Measuring the Upstream RF Signal Using a Spectrum Analyzer Page Page Analyzing the Upstream RF Signal Page Page Using the Zero-Span Method with Adjacent Upstream Channels Page Page Page Page Page Page Page Page Measuring the RF Signal at the Forward Test Point on a Laser Transmitter Page Page Configuring the Digital Signal Page Page Maintaining the Cisco uBR7225VXR Router Online Insertion and Removal Environmental Monitoring and Reporting Functions Environmental Monitoring Reporting Functions Page Page Fan Failures Troubleshooting Overview Providing Information 6-2 Chapter6 Troubleshooting Problem Solving with Subsystems Problem Solving with Subsystems Tip Isolating a problem to a specific subsystem simplifies the troubleshooting process. be operating whenever system power is on. Processor subsystemIncludes the network processing engine and cable interface line cards. Identifying Startup Problems Power Subsystem Cooling Subsystem Processor Subsystem Troubleshooting the Network Processing Engine Troubleshooting Cable Interface Line Cards Other Troubleshooting Information Websites Verifying the Downstream Signal Page A Cisco uBR7225VXR Router Specifications Cisco uBR7225VXR Physical and System Specifications Page B RF Specifications DOCSIS 1.0 Transmission Characteristics Page DOCSIS 1.1 Transmission Characteristics EuroDOCSIS Transmission Characteristics Page Page Electrical Input and Output Page Page C Cable Specifications Coaxial Cables Console and Auxiliary Port Cables and Pinouts Identifying an RJ-45 Rollover Cable Console Port Cables and Pinouts Auxiliary Port Cables and Pinouts Fast Ethernet Port Cables and Pinouts Identifying an RJ-45 Crossover Cable Identifying an RJ-45 Straight-Through Cable Fiber-Optic Cables and Connectors D Industry-Standard Wiring Plans About Wiring Standards TIA/EIA Standards Information Optical Fiber Color Codes Telephone Wire Color Codes Page Page Page E Frequency Allocation Tables Standards Comparisons NTSC Cable Television Channels and Relative Frequencies Page Page Page Page NTSC (M) Cable Television Frequencies for Japan Page PAL/SECAM Cable Television Channels and Relative Frequencies Page Page Page Page F Manufacturers for Headend Provisioning Requirements North American Channel Plans Page European Channel Plans Page G Site Log Page GLOSSARY Symbols A B C D E F G H I M N O P Q R T U V X INDEX A B C D E F G H I J K L M N Q R S T U V W X Z