Cisco uBR7246 - Manual
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Table of Contents:
- Page 3 – Description of Cisco uBR7246 Cable Router
- Page 4 – List of Terms
- Page 5 – Prerequisite Tasks
- Page 6 – Supported MIBs and RFCs; Configure the Downstream Cable Interface
- Page 7 – Set the Downstream Center Frequency; Validation Tips; show controllers cable
- Page 8 – Set the Downstream Symbol Rate; Troubleshooting Tips; cable downstream if-output
- Page 9 – Set the Downstream MPEG Framing Format (Annex A or Annex B); show; Set the Downstream Modulation
- Page 10 – Set the Downstream Interleave Depth
- Page 11 – Activate the Downstream Carrier
- Page 12 – Configure the Upstream Cable Interface; Set the Upstream Frequency
- Page 13 – Set the Upstream Input Power Level
- Page 14 – Activate Upstream Forward Error Correction
- Page 15 – more; Activate the Upstream Scrambler
- Page 16 – Activate the Upstream Ports
- Page 17 – show interface cable; Configure and Activate Baseline Privacy
- Page 18 – Configure Kek Encryption Key Privacy; show cable privacy kek; Configure Traffic Encryption Key Privacy
- Page 19 – Activate Baseline Privacy; Configure and Activate Frequency Agility
- Page 20 – Create Spectrum Groups
- Page 21 – Configure and Activate Spectrum Groups; show cable; Activate IP Address Resolution Protocol
- Page 22 – Activate Address Resolution Protocol Requests
- Page 23 – Activate Proxy ARP Requests; Set Optional IP Parameters
- Page 24 – Activate IP Multicast Echo; Activate IP Broadcast Echo
- Page 25 – Manage Cable Modems on the HFC Network; Activate Cable Modem Authentication
- Page 26 – Activate Cable Modem Upstream Address Verification
- Page 27 – Activate Cable Modem Insertion Interval
- Page 28 – Universal Broadband Features Configuration Example
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
Description of Cisco uBR7246 Cable Router Configuring Cisco uBR7246 Universal Broadband Router Features VC-135 Description of Cisco uBR7246 Cable Router As shown in Figure 38, the Cisco uBR7246 serves as an interface between a WAN backbone and an HFC cable plant. Typically installed at a CATV headen...
List of Terms VC-136 Voice, Video, and Home Applications Configuration Guide • Providing a universal platform for deployment of both current and future modem technologies via modular upgrades while protecting the operator’s invested capital. • Leveraging Cisco’s industry-standard routing hardware an...
List of Terms Configuring Cisco uBR7246 Universal Broadband Router Features VC-137 Prerequisite Tasks Before you can configure Cisco uBR7246 universal broadband router features, you must first: • Make sure that your current network is designed to support broadband transmission. At the very least, yo...
