Cisco Systems UBR7225VXR specifications Power Subsystem, Cooling Subsystem

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Chapter 6 Troubleshooting

Power Subsystem

Power Subsystem

Check the following to help isolate a problem with the power subsystem:

Step 1 Toggle the power supply switch off and on.

Step 2 On the first power supply, is the Input OK LED on?

a.If yes, the power source is good, and the power supply is functional.

b.If not, make sure that the power cable is connected at both ends. Then toggle the power switch off and on.

Step 3 If the Input OK LED remains off, and the power switch is on, suspect the power source or the power cable.

a.Turn the switch off, and connect the power cable to another power source, if available.

b.Turn the switch back on.

c.If the Input OK LED comes on, the problem is the first power source.

Step 4 If the Input OK LED fails to come on after you connect the power supply to a new power source,

a.Turn the power switch off.

b.Replace the power cord.

c.Turn the switch back on.

Step 5 If the Input OK LED comes on, return the first power cable for replacement. Contact a service representative for further instructions.

Step 6 If the Input OK LED still fails to come on when the power supply is connected to a different power source with a new power cable, the power supply is probably faulty.

a.If a second power supply is available, and your Cisco uBR7225VXR router has a redundant power supply bay, install the second power supply in the second bay if there is no power supply installed in that bay.

b.Contact a service representative for further instructions.

Step 7 Is the Input OK LED on for the second (redundant) power supply?

a.If yes, proceed to the “Cooling Subsystem” section on page 6-4.

b.If not, repeat each of the above procedures for the second power supply.

Step 8 If you are unable to resolve the problem or if you determine that either a power supply or chassis connector is faulty, contact a service representative for instructions.

Cooling Subsystem

Check the following to help isolate a problem with the cooling system:

Step 1 Verify that the fans are operating when you start up the system.

Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide

6-4	OL-17309-02

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Contents Americas Headquarters Text Part Number OL-17309-02Page N T E N T S AC Power Measuring the Downstream RF Signal at the Upconverter Output Maintaining the Cisco uBR7225VXR Router Coaxial Cables C-1 Viii Document Objectives PrefaceDocument Revision History Revision Date Change SummaryChapter Title Description AudienceDocument Organization Document Conventions Appendix G, Site LogObtaining Documentation and Submitting a Service Request Cisco uBR7225VXR Overview Cisco uBR7225VXR Universal Broadband RouterOL-17309-02 Cisco uBR7225VXR Router Chassis Cable interface line card slotCisco uBR7225VXR Network Interface Overview Card Slot and Logical Interface NumberingMAC-Layer Address Cisco uBR7255VXR Chassis and Cable Interface Line CardsSupported System Configurations Overview Basic Internet Access ServicesTwo-Way HFC Cable Network Example VPN Services IP Telephony ServicesTelco Return HFCHardware Component Descriptions Network Processing EngineNPE Comparisons Cisco Cable Interface Line Cards Power Supplies Cisco uBR7225VXR AC-Input Power Supply Fan TraysCisco uBR7225VXR Fan Tray Internal Airflow-Top View Cisco uBR7225VXR Chassis Subchassis and MidplaneCompactFlash Disk Top BackCisco uBR7225VXR Overview Hardware Component Descriptions OL-17309-02 Installation Safety RecommendationsLifting the Cisco uBR7225VXR Router Safely Safety with Electricity Lifting the Chassis Cisco uBR7246 Router ShownPreventing Electrostatic Discharge Damage Site Environment AC PowerSite Requirements Specification Minimum Maximum Site Configuration Maintaining Normal OperationGeneral Precautions Before You Begin Power ConsiderationsRequired Network Information Installation Tools Rack-Mount and Cable-Management KitEquipment Required to Verify Your Plant’s RF Setup Shipping Container ContentsProvisioning the Cable Headend Two-Way Data and VoIPReceivers Headend CertificationDiplex Filters Dial-Up/Remote Access Servers DHCP, DNS, TFTP, and TD ServersVoIP Sgcp Pass-Through Authentication, Authorization, and Accounting ServersVoIP Gateways and Gatekeepers Headend Wiring Interference ConsiderationsEquipment Racks 17.32 23.875 21.875 Site Preparation Checklist Task Verified By DateComponent Checklists Task Verified By DateInstalling the Cisco uBR7225VXR Router Cisco uBR7225VXR Router Installation ChecklistCisco uBR7225VXR Router Chassis Rack-Mounting Options Typical 4-Post Equipment Rack Posts and Mounting Strips Rack-mount bracket Installing the Chassis in a Telco-Type Rack Cable-Management Bracket RequirementsRack-mount bracket Cable-management bracket Installing the Brackets on the Chassis Installing Rack-Mount Brackets on the Rear of the ChassisInstalling 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 OL-17309-02 OL-17309-02 Cabling Connecting Cable Interface Line Card Cables Console and Auxiliary Port Connection EquipmentPin Signal Direction Description Console Port SignalsAuxiliary Port Signals Connecting Power Protective GroundingConnecting to the AC-Input Power Supply Powering On the Cisco uBR7225VXR Router 14 Connecting AC-Input PowerConfiguring the Interfaces OL-17309-02 Connecting the Cisco uBR7225VXR Router to the Cable Headend Two-Way Data Headend Architecture One-Way Data Headend Architecture RF and Digital Data OverviewInstalling and Configuring the Upconverter Connecting and Configuring the DownstreamMeasuring the Downstream RF Signal Page Viewing the Downstream if Signal on a Spectrum Analyzer Measuring the Downstream RF Signal at the Upconverter Output Overloaded Spectrum Analyzer Input Page OL-17309-02 OL-17309-02 OL-17309-02 OL-17309-02 OL-17309-02 OL-17309-02 OL-17309-02 OL-17309-02 Docsis Specification Connecting and Configuring the UpstreamConnecting the Upstream to the Optical Receiver Channel Bandwidth Cisco MC11 FpgaTesting the Upstream Configuration 30 km Fiber node Milliwatt Measure +10 dBmV at this pointOptical receiver Downstream Optical +10 dBmV Receiver +13 dBmV Attenuator Measuring the Upstream RF Signal Measuring the Upstream RF Signal Using a Spectrum AnalyzerOL-17309-02 OL-17309-02 Analyzing the Upstream RF Signal 29 Analyzing the Upstream RF Signal-64-Byte Data Packets30 Analyzing the Upstream RF Signal-1500-Byte Data Packets OL-17309-02 Symbol Rate +/-1/2 Symbol Rate Bandwidth Using the Zero-Span Method with Adjacent Upstream ChannelsCenter Frequency Minimum Resolution OL-17309-02 35 Vector Signal Analyzer Plot of Upstream Data Burst OL-17309-02 OL-17309-02 OL-17309-02 39 Preamble Amplitude Before Center Frequency Adjustment 41 Original Preamble Viewed with Accelerated Sweep Time OL-17309-02 Connecting the Cisco uBR7225VXR Router to the Cable Headend OL-17309-02 Connecting the Cisco uBR7225VXR Router to the Cable Headend Configuring the Digital Signal OL-17309-02 OL-17309-02 Maintaining the Cisco uBR7225VXR Router Online Insertion and RemovalEnvironmental Monitoring and Reporting Functions Environmental MonitoringReporting Functions Parameter High Warning High Critical ShutdownRouter# show environment Temperature ranges and values are subject to change Fan Failures Providing Information TroubleshootingOverview Problem Solving with Subsystems Troubleshooting Problem Solving with SubsystemsIdentifying Startup Problems Power Subsystem Cooling SubsystemTroubleshooting the Network Processing Engine Processor SubsystemTroubleshooting Cable Interface Line Cards Verifying the Downstream Signal Other Troubleshooting Information WebsitesTroubleshooting Verifying the Downstream Signal Cisco uBR7225VXR Router Specifications Description SpecificationBroadband Routers at the following URL Bandwidth, MHz Msym/sec Mbps Rate, Mbps RF SpecificationsChannel Symbol Rate Raw Data Rate Nominal Data Channel Qpsk RawParameter Value Docsis 1.0 Transmission CharacteristicsDownstream RF Channel Transmission Characteristics Upstream RF Channel Transmission Characteristics Docsis 1.1 Transmission Characteristics EuroDOCSIS Transmission Characteristics Downstream RF Channel Transmission Characteristics Upstream RF Channel Transmission Characteristics Electrical Input and Output Parameter Value OL-17309-02 Cable Specifications Coaxial CablesConsole and Auxiliary Port Cables and Pinouts Identifying an RJ-45 Rollover CableConsole Port Cables and Pinouts RJ-45-to-DB-9Identifying an RJ-45 Crossover Cable Fast Ethernet Port Cables and PinoutsAuxiliary Port Cables and Pinouts RJ-45 Pin Description Identifying an RJ-45 Straight-Through CableRJ-45 Pin Fiber-Optic Cables and Connectors Figure C-5 Duplex SC Cable ConnectorIndustry-Standard Wiring Plans About Wiring StandardsPosition Color Optical Fiber Color CodesTIA/EIA Standards Information Telephone Wire Color Codes Pair Number Wire Number Solid Color Stripe Color Pin NumberPair Number Wire Number Solid Color Stripe Color Pin Number Pair Number Wire Number Solid Color Stripe Color White Blue Green Red Orange Black YellowOL-17309-02 Frequency Allocation Tables Http//developer.apple.com Http//atxnetworks.comStandards Comparisons B1, G D1, KNtsc Cable Television Channels and Relative Frequencies Freq MHz Carrier Visual Aural Table E-4 Freq MHz Carrier Visual Aural Table E-4 Ntsc M Cable Television Frequencies for Japan Table E-5 Japanese Channel Assignments PAL/SECAM Cable Television Channels and Relative Frequencies Bandwidth Visual Carrier Aural CarrierChannel Channel Bandwidth Visual Carrier Aural Carrier Number MHz Table E-6 OL-17309-02 Manufacturer Website or Phone Number Products/Model Manufacturers for Headend Provisioning RequirementsNorth American Channel Plans Agilent Agilent 89411A European Channel Plans Agilent Agilent 8591C Tektronix 2715 Sunrise Telecom AT2000R Site Log Initials Symbols GL-2 GL-3 GL-4 GL-5 GL-6 D E IN-2 IN-3 IN-4 IN-5 IN-6 IN-7 IN-8

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