Cisco Systems uBR7200 manual Headend Overview, MC-520

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Configuring Headend Broadband Access Router Features

Headend Overview

Headend Overview

a WAN backbone and a hybrid fiber-coaxial (HFC) cable network. Installed at a Community Antenna Television (CATV) head-end facility or distribution hub, the Cisco uBR7200 series is often located with the following Internet service provider (ISP)-related components:

Ethernet switch

Proxy servers

WAN router

Gatekeeper/gateway equipment for Voice over IP (VoIP) applications The Ethernet switch is used to reduce traffic on the WAN backbone.

The proxy server usually functions as a Web cache for host computers and as the Dynamic Host Control Protocol/Trivial File Transfer Protocol (DHCP/TFTP) server for cable modems. DHCP for host computers in the HFC plant is often handled over the WAN. The WAN router provides a gateway to the data network.

For more information on these components and their requirements, refer to the “Supported System Configurations” section of the “Cisco uBR7200 Series Overview” chapter of the Cisco uBR7200 Series Hardware Installation Guide.

Note At the time of publication of this document, the Cisco uBR7200 series universal broadband routers use 6 MHz radio frequency (RF) channel plans only. However, Cisco IOS Release 12.1 T will support 8 MHz channel plans with the Cisco MC16E cable modem card.

On the RF side, the downstream port on the Cisco uBR7200 series router is assigned a 6 MHz channel slot at a standard broadcast CATV frequency. An upconverter device is used to convert the 44 MHz intermediate frequency (IF) output to the assigned slot. In North America, carrier frequencies in the forward plant are assigned from 54 MHz to 860 MHz. After upconversion, the signal is combined with other analog TV or digital TV signals and sent to the transmit input of a fiber transceiver.

The receive input of the fiber transceiver is connected to an upstream port of the Cisco uBR7200 series router. The upstream port is assigned a 0.2 MHz to 3.2 MHz frequency band in the reverse plant. In North America, carrier frequencies in the reverse plant are between 5 MHz and 42 MHz.

The fiber transceiver is connected to up to 80 kilometers of optical fiber. Signals are carried in analog form to a neighborhood, where they terminate in a fiber node. The fiber node, located on a telephone pole or in an underground box, converts the optical signal back to an electrical signal, which is then passed on to a two-way distribution amplifier system. The distribution amplifier system passes through the neighborhood, where it is tapped off to individual CATV subscribers.

A coaxial cable delivers the signal from the tap to a drop box located on the subscriber premises. From the drop box, the signal is split and cabled to consumer CATV appliances. One cable goes to the television or set-top box; the other cable goes to a cable modem appliance such as a Cisco uBR900 series cable access router, providing data and IP telephony services.

Figure 106 illustrates the topology of a typical HFC network supporting basic data services.

Cisco IOS Multiservice Applications Configuration Guide

MC-520

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Contents Configuring Headend Broadband Access Router Features MC-519Headend Overview MC-520Topology of a Typical Broadband Network Voice over IP Services Telco Return MC-523MC-524 TODMultiple Service IDs QoS FeaturesService Class Profiles MC-525MC-526 TAG/NetFlow SwitchingQoS Profile Enforcement MC-527 Tag SwitchingNetflow Switching Weighted Fair Queueing Security FeaturesWeighted Random Early Detection Committed Access Rate CARUpstream Address Verification Cable Modem and Multicast Authentication Using RadiusDocsis Baseline Privacy MC-529Dynamic Ranging Traffic Shaping FeaturesOperations and Provisioning Features MC-530Downstream Frequency Override Downstream Channel ID ConfigurationBurst Profile Configuration CPE LimitationSpectrum Management Headend Broadband Access Router Configuration Prerequisites MC-533Headend Broadband Access Router Configuration Tasks MC-534CMTS01config# interface cable 6/0 Configuring the Downstream Cable InterfaceCMTS01# configure terminal Activating the Downstream CarrierVerifying the Downstream Carrier Setting the Downstream Center FrequencyTroubleshooting Tips MC-536MC-537 CMTS01config-if#cable downstream frequencyVerifying the Downstream Center Frequency Verifying the Downstream Channel ID Setting the Downstream Channel IDSetting the Downstream Mpeg Framing Format Annex B MC-538Verifying the Downstream Modulation Setting the Downstream ModulationVerifying the Downstream Mpeg Framing Format MC-539Verifying the Downstream Interleave Depth Setting the Downstream Interleave DepthCMTS01config-if#cable downstream interleave-depth MC-540MC-541 Setting the Downstream Helper AddressVerifying the Downstream Helper Address Setting Downstream Rate Limiting MC-542MC-543 Configuring the Upstream Cable InterfaceVerifying Downstream Rate Limiting Setting the Upstream Frequency MC-544CMTS01# show controllers cable 6/0 u0 Verifying the Upstream FrequencyMC-545 MC-546 Setting the Upstream Channel WidthVerifying Upstream Channel Width Channel-width widthSetting the Upstream Input Power Level MC-547Verifying Upstream Admission Control Verifying the Upstream Input Power LevelActivating Upstream Admission Control MC-548Activating Upstream FEC MC-549Verifying Upstream FEC Router# more systemrunning-configSpecifying Upstream Minislot Size MC-550MC-551 Activating the Upstream ScramblerVerifying Upstream Minislot Size Verifying the Upstream Scrambler CMTS01config-if#cable upstream usport scramblerCMTS01# more systemrunning-config MC-552Verifying Upstream Differential Encoding Activating Upstream Differential EncodingActivating Upstream Rate Limiting MC-553MC-554 CMTS01config-if#no cable upstream usport rate-limitVerifying Upstream Rate Limiting MC-555 Activating Upstream Frequency AdjustmentFrequency-adjust averaging percentage MC-556 Activating Upstream Power AdjustmentVerifying Upstream Frequency Adjustment MC-557 Activating Upstream Timing AdjustmentVerifying Upstream Power Adjustment Continue secondsMC-558 Verifying Upstream Timing AdjustmentActivating the Upstream Ports MC-559 Setting Upstream Backoff ValuesVerifying the Upstream Ports Data-backoff start end CMTS01config-if#cable upstream usport rangeMC-560 Data-backoff automaticMC-561 Configuring and Activating Baseline PrivacyVerifying Upstream Data Backoff Automatic MC-562 Configuring KEK PrivacyCMTS01config-if#cable privacy kek grace-time Verifying TEK Privacy Configuring TEK PrivacyVerifying KEK Privacy MC-563Verifying Baseline Privacy Configuring and Activating Frequency AgilityActivating Baseline Privacy MC-564Combiner Groups MC-565Frequency Management Policy MC-566Determining the Upstream Ports Assigned to a Combiner Group MC-567Verifying Spectrum Groups Configuring and Activating Spectrum GroupsCreating Spectrum Groups MC-568Command Purpose MC-569MC-570 MC-571 Verifying Spectrum Group ConfigurationVerifying Frequency Hopping Configuring Spectrum Group Characteristics MC-572MC-573 Verifying Spectrum Group CharacteristicsCMTS01config# cable spectrum-group groupnum hop Threshold percentActivating Cable ARP Requests Activating IP Address Resolution ProtocolAssigning the Spectrum Group and the Upstream Ports Verifying Spectrum Group and Upstream Port AssignmentsMC-575 Activating Host-to-Host Communication Proxy ARPVerifying ARP Requests Activating Cable Relay Agent Configuring Dhcp OptionsActivating Cable Proxy ARP Requests Verifying Cable Proxy ARP RequestsMC-577 Activating Dhcp giaddrVerifying Dhcp giaddr Activation Configuring ToD Service Setting Service OptionsSetting Optional IP Parameters Verifying ToD ServiceVerifying IP Multicast Echo Activating IP Multicast EchoActivating IP Broadcast Echo MC-579Verifying IP Broadcast Echo Configuring Cable ProfilesConfiguring Cable Modulation Profiles MC-580Number profile MC-581MC-582 Configuring QoS ProfilesVerifying Cable Modulation Profiles Verifying QoS Profiles MC-583Verifying QoS Permission Setting QoS PermissionEnforcing a QoS Profile Assignment MC-584MC-585 Managing Cable Modems on the HFC NetworkVerifying a QoS Profile Assignment Activating Cable Modem Authentication Configuring Sync Message IntervalConfiguring Telco Return Verifying Sync Message IntervalMC-587 Verifying Cable Modem AuthenticationActivating Cable Modem Upstream Address Verification Verifying Cable Modem Upstream Address Verification CMTS01config-if#cable source-verify dhcpActivating Cable Modem Insertion Interval MC-588MC-589 CMTS01config-if#cable insertion-interval automaticVerifying Cable Modem Insertion Interval MC-590 Configuring Cable Modem Registration TimeoutVerifying the Maximum Number of Hosts MC-591 Clearing and Resetting Cable ModemsVerifying Registration Timeout MC-592 Verifying Cable Modem Clearing and ResettingClearing Cable Modem Counters Verifying Ping Docsis Using Ping DocsisVerifying that Cable Modem Counters are Cleared MC-593Spectrum Management Configuration Example MC-594Virtual Private Network Configuration Example MC-595MC-596 Ip http server Ip http authentication local No cdp run MC-597VoIP Configuration Example MC-598MC-599 Ip subnet-zero No ip domain-lookupTelco Return Configuration Example MC-600Cable telco-return enable MC-601MC-602 QoS Profile Enforcement Configuration ExampleCable Modem all reset Cable RegCMTS01config# cable flap-list aging days Troubleshooting Using Cable Flap ListsSetting Cable Flap List Aging MC-603Verifying Cable Flap List Aging Setting Cable Flap List Insertion TimeSetting Cable Flap List Power Adjustment Threshold Verifying Cable Flap List Insertion TimeCMTS01config# cable flap-list miss-threshold misses Setting Cable Flap List Miss ThresholdVerifying Cable Flap List Power Adjustment Threshold Verifying Cable Flap List Miss ThresholdVerifying Cable Flap List Size Setting Cable Flap List SizeClearing Cable Flap List MC-606
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