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Configuring Cisco uBR7246 Universal Broadband Router Features VC-133

Configuring Cisco uBR7246 Universal

Broadband Router Features

Cisco uBR7246 universal broadband features enable the Cisco uBR7246 universal broadband router

to communicate with a hybrid fiber coaxial (HFC) cable network via a Cisco MC11 cable modem

card. Cisco MC11 cable modem cards allow you to connect cable modems on the HFC network to

a Cisco uBR7246 in a Community Antenna Television (CATV) headend facility. The modem card

provides the interface between the Cisco uBR7246 protocol control information (PCI) bus and the

radio frequency (RF) signal on the HFC network. For a description of the commands used to

configure universal broadband features, refer to the “Cisco uBR7246 Universal Broadband Features

Commands” chapter in the Voice, Video, and Home Applications Command Reference.

The MC11 cable modem cards consist of the following components:

• One downstream cable F-connector port—The downstream port supports quadrature amplitude

modulation (QAM) speeds of 64-QAM, or 6 bits per symbol. A symbol is the basic unit of

modulation in CATV systems.

• One upstream cable F-connector port—The upstream port supports quadrature phase shift keying

(QPSK) modulation, or 2 bits per symbol.

• Cable Media Access Control (MAC) unit—The cable MAC frames and encrypts the downstream

signal for RF transmission and passes the signal to the downstream physical layer (PHY).

Reverses the signal framing and encryption on the upstream signal from the upstream PHY.

• Downstream PHY unit—The downstream PHY generates a modulated, intermediate frequency

(IF) output signal at a frequency of 44 MHz and passes the IF signal to an external IF to RF

upconverter installed in the downstream path.

• Upstream PHY unit—The upstream PHY receives the modulated, upstream signal at a frequency

of 5 MHz to 40 MHz and passes the signal to the cable MAC to remove the framing and

encryption formats.

• Spectrum manager—The spectrum manager continuously monitors the noise in unused upstream

channels. If the signal-to-noise ratio reaches an unacceptable level on a particular channel, the

spectrum manager will automatically assign a new upstream channel to the cable modem using

that channel. This feature is referred to as frequency agility.

You must install at least one Cisco MC11 cable modem card in the Cisco uBR7246 chassis to

establish communication between the Cisco uBR7246 and the HFC network.

Figure 38 shows the network topology for the modem card and illustrates network connections using

the Cisco uBR7246.

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Summary of Contents

Page 1 - Broadband Router Features

Configuring Cisco uBR7246 Universal Broadband Router Features VC-133Configuring Cisco uBR7246 Universal Broadband Router FeaturesCisco uBR7246 univer

Page 2

Configure the Downstream Cable InterfaceVC-142Voice, Video, and Home Applications Configuration GuideTo set the downstream modulation, use the followi

Page 3 - Benefits of Cisco uBR7246

Activate the Downstream Carrier Configuring Cisco uBR7246 Universal Broadband Router Features VC-143Troubleshooting TipsIf you are having trouble: • M

Page 4 - List of Terms

Configure the Upstream Cable InterfaceVC-144Voice, Video, and Home Applications Configuration GuideConfigure the Upstream Cable InterfaceThe next step

Page 5 - Prerequisite Tasks

Set the Upstream Input Power Level Configuring Cisco uBR7246 Universal Broadband Router Features VC-145Validation TipsTo verify the current value of t

Page 6 - Supported MIBs and RFCs

Configure the Upstream Cable InterfaceVC-146Voice, Video, and Home Applications Configuration GuideValidation TipsTo verify the current value of the u

Page 7

Activate the Upstream Scrambler Configuring Cisco uBR7246 Universal Broadband Router Features VC-147Validation TipsTo verify if FEC is activated or de

Page 8

Configure the Upstream Cable InterfaceVC-148Voice, Video, and Home Applications Configuration GuideValidation TipsTo verify if the upstream scrambler

Page 9

Configure and Activate Baseline Privacy Configuring Cisco uBR7246 Universal Broadband Router Features VC-149Validation TipsTo verify if the upstream p

Page 10 - Troubleshooting Tips

Configure and Activate Baseline PrivacyVC-150Voice, Video, and Home Applications Configuration GuideThe configuration and activation of baseline priva

Page 11

Activate Baseline Privacy Configuring Cisco uBR7246 Universal Broadband Router Features VC-151Validation TipsTo verify the tek life-time or grace-time

Page 12

VC-134Voice, Video, and Home Applications Configuration GuideFigure 38 Topology for uBR7246 Universal Broadband InternetATM, 100BT, 10BT100BTAnalog TV

Page 13

Configure and Activate Frequency AgilityVC-152Voice, Video, and Home Applications Configuration GuideNote The cable interface will not operate until y

Page 14

Configure and Activate Spectrum Groups Configuring Cisco uBR7246 Universal Broadband Router Features VC-153Configure and Activate Spectrum GroupsAfter

Page 15

Activate Host-to-Host Communication (Proxy ARP)VC-154Voice, Video, and Home Applications Configuration GuideActivate Address Resolution Protocol Reque

Page 16 - Activate the Upstream Ports

Activate Proxy ARP Requests Configuring Cisco uBR7246 Universal Broadband Router Features VC-155Activate Proxy ARP RequestsTo activate proxy ARP for h

Page 17

Set Optional IP ParametersVC-156Voice, Video, and Home Applications Configuration GuideActivate IP Multicast EchoYou can activate upstream IP multicas

Page 18 - • Activate Baseline Privacy

Manage Cable Modems on the HFC Network Configuring Cisco uBR7246 Universal Broadband Router Features VC-157Validation TipsTo verify if IP broadcast ec

Page 19 - Activate Baseline Privacy

Manage Cable Modems on the HFC NetworkVC-158Voice, Video, and Home Applications Configuration GuideTo activate cable modem authentication, use the fol

Page 20 - Create Spectrum Groups

Activate Cable Modem Insertion Interval Configuring Cisco uBR7246 Universal Broadband Router Features VC-159Validation TipsTo verify that cable modem

Page 21

Universal Broadband Features Configuration ExampleVC-160Voice, Video, and Home Applications Configuration GuideValidation TipsTo verify that a cable m

Page 22

Description of Cisco uBR7246 Cable Router Configuring Cisco uBR7246 Universal Broadband Router Features VC-135Description of Cisco uBR7246 Cable Route

Page 23 - Set Optional IP Parameters

List of TermsVC-136Voice, Video, and Home Applications Configuration Guide• Providing a universal platform for deployment of both current and future m

Page 24 - Activate IP Broadcast Echo

List of Terms Configuring Cisco uBR7246 Universal Broadband Router Features VC-137Prerequisite TasksBefore you can configure Cisco uBR7246 universal b

Page 25

Configure the Downstream Cable InterfaceVC-138Voice, Video, and Home Applications Configuration Guide• Install at least one Cisco MC11 cable modem car

Page 26

Set the Downstream Center Frequency Configuring Cisco uBR7246 Universal Broadband Router Features VC-139Note The default values for the commands used

Page 27

Configure the Downstream Cable InterfaceVC-140Voice, Video, and Home Applications Configuration GuideTroubleshooting TipsIf you are having trouble: •

Page 28

Set the Downstream MPEG Framing Format (Annex A or Annex B) Configuring Cisco uBR7246 Universal Broadband Router Features VC-141Set the Downstream MPE