Cisco Systems UBR7225VXR specifications Two-Way Data Headend Architecture

Page 72

Chapter 4 Connecting the Cisco uBR7225VXR Router to the Cable Headend

Two-Way Data Headend Architecture

Two-Way Data Headend Architecture

Figure 4-1shows a typical headend configuration configured for two-way data, including digitized voice and fax.

Figure 4-1

Typical Cable Headend Configuration for Two-Way Data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Laser

 

 

 

 

 

 

Main

 

 

 

 

transmitter

 

 

 

 

 

 

 

 

 

 

 

 

 

Node 1

 

Cisco

 

headend feed

 

Broadcast

+17 dBmV

 

 

 

 

 

 

Optical

 

 

 

 

 

 

video carrier

 

 

uBR7225VXR

 

 

 

 

 

 

splitter

 

 

 

 

 

 

 

 

 

(typical)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8-way

Narrowcast

 

 

Node 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tap

+7 dBmV

 

 

 

 

 

 

0 to 20 dB

 

 

Downstream

 

 

 

 

 

3-way

 

 

 

 

 

attenuator

 

 

data carrier

forward

 

 

 

 

 

 

splitter

 

(typical)

 

 

 

Downstream

 

(as required)

 

 

test point

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Upstream

 

 

 

 

 

 

 

 

 

 

 

 

0 dBmV

 

 

Optical

 

Reverse optical

 

 

 

 

 

 

+10 dBmV

 

receiver

Fiber-optic transmitter

 

 

 

+31 dBmV

 

 

6 dB

X

3 dB

+13 dBmV

 

cable

 

+17 dBmV

Distribution

+48 dBmV

 

 

attenuator

attenuator

 

 

 

 

 

 

network

 

 

 

 

 

 

 

 

 

 

 

2-way

 

Diplex filter

 

 

 

 

 

 

Modem

 

 

splitter

 

 

 

 

 

 

 

Cable

 

 

 

 

 

 

 

 

transmit

 

40 dB

 

 

 

 

 

 

 

 

 

 

 

 

L H

Downstream

 

 

 

 

 

 

levels modems

 

attenuator

 

 

 

 

 

 

 

 

 

(0 to +5 dBmV)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

Cable

 

 

 

 

 

 

 

 

 

 

 

 

modem

 

 

 

 

 

 

 

 

 

 

 

 

 

Optical

 

Reverse optical

 

 

 

 

 

 

+10 dBmV

 

receiver

Fiber-optic transmitter

 

 

 

+58 dBmV

 

 

6 dB

X

8 dB

+18 dBmV

 

cable

 

+17 dBmV

Distribution

+42 dBmV

 

 

attenuator

attenuator

 

 

 

 

 

 

network

 

 

 

 

 

 

 

 

 

 

 

2-way

 

Diplex filter

 

 

 

 

 

 

Modem

 

 

splitter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

transmit

 

 

40 dB

 

 

Downstream

 

 

 

 

 

 

 

 

 

L H

 

 

 

 

 

 

levels

 

 

attenuator

 

 

 

 

 

 

 

 

 

 

(0 to +5 dBmV)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

Cable

 

 

 

 

 

 

 

 

 

 

 

 

modem

 

 

 

 

 

 

 

 

 

 

 

 

 

Optical

 

Reverse optical

 

 

+50 dBmV

 

 

 

+10 dBmV

 

receiver

Fiber-optic

transmitter

 

 

 

 

 

 

 

 

+31 dBmV

 

+17 dBmV

 

+42 dBmV

 

 

6 dB

X

21 dB

 

cable

 

Distribution

 

 

attenuator

attenuator

 

 

 

 

 

network

 

 

 

 

 

 

 

 

 

 

 

 

2-way

 

Diplex filter

 

 

 

 

 

 

+49 dBmV

 

 

splitter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Modem

 

 

40 dB

 

 

Downstream

 

 

 

 

 

 

 

 

 

L H

 

 

 

 

 

 

transmit

 

 

attenuator

 

 

 

 

 

 

 

 

 

 

(0 to +5 dBmV)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

levels

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cable modem

271671

Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide

4-2

OL-17309-02

 

 

Page 71 Page 73
Image 72
Page 71 Page 73
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 Preface Document Revision HistoryDocument Objectives Revision Date Change SummaryAudience Document OrganizationChapter Title Description 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 AC Power Site RequirementsSite Environment Site Configuration Maintaining Normal Operation General PrecautionsSpecification Minimum Maximum Power Considerations Required Network InformationBefore You Begin 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 VoIPHeadend Certification Diplex FiltersReceivers Dial-Up/Remote Access Servers DHCP, DNS, TFTP, and TD ServersAuthentication, Authorization, and Accounting Servers VoIP Gateways and GatekeepersVoIP Sgcp Pass-Through 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 EquipmentConsole Port Signals Auxiliary Port SignalsPin Signal Direction Description 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 OverviewConnecting and Configuring the Downstream Measuring the Downstream RF SignalInstalling and Configuring the Upconverter 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 Connecting and Configuring the Upstream Connecting the Upstream to the Optical ReceiverDocsis Specification 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 Using the Zero-Span Method with Adjacent Upstream Channels Center Frequency Minimum ResolutionSymbol Rate +/-1/2 Symbol Rate Bandwidth 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 Troubleshooting OverviewProviding Information 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 RF Specifications Channel Symbol Rate Raw Data Rate Nominal DataBandwidth, MHz Msym/sec Mbps Rate, Mbps Channel Qpsk RawDocsis 1.0 Transmission Characteristics Downstream RF Channel Transmission CharacteristicsParameter Value 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-9Fast Ethernet Port Cables and Pinouts Auxiliary Port Cables and PinoutsIdentifying an RJ-45 Crossover Cable Identifying an RJ-45 Straight-Through Cable RJ-45 PinRJ-45 Pin Description Fiber-Optic Cables and Connectors Figure C-5 Duplex SC Cable ConnectorIndustry-Standard Wiring Plans About Wiring StandardsOptical Fiber Color Codes TIA/EIA Standards InformationPosition Color 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 Manufacturers for Headend Provisioning Requirements North American Channel PlansManufacturer Website or Phone Number Products/Model 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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