Configuring The Upstream Cable Modem Interface - Cisco 7246VXR - uBR Router Software Configuration Manual

Chapter 3 Configuring Cable Modem Interface Features
Building configuration...
Current configuration:
!
interface cable5/0
ip address 10.254.254.254 255.0.0.0
no ip directed-broadcast
cable helper-address 192.168.1.1
no keepalive
cable downstream annex B
cable downstream modulation 64qam
Perform these steps if you are having difficulty with verification:
Ensure that the cable connections are not loose or disconnected.
Step 1
Step 2 Ensure that the cable interface line card is firmly seated in its chassis slot.
Ensure that the captive installation screws are tight.
Step 3
Step 4 Verify that you have entered the correct slot and port numbers.
Verify that you selected the default if you are not certain about the modulation rate needed.
Step 5
Step 6 Verify that the downstream carrier is active using the cable downstream if-output command.

Configuring the Upstream Cable Modem Interface

These configurations are required. Upstream cable interface commands configure the frequency and input
power level of the upstream signal, in addition to error detection and correction of the upstream signal. The
configuration of the upstream cable interface depends on the characteristics of your cable plant.
Perform the following tasks in this section to configure the upstream cable interface.
For some of these tasks, default values are adequate to configure the device.
Note
Task
"Activating Upstream Admission
Control" section on page 3-12
"Activating Upstream Differential
Encoding" section on page 3-13
"Activating Upstream Forward Error
Correction" section on page 3-14
"Activating the Upstream Ports"
section on page 3-15
OL-2239-03
Description
Provides information about the upstream admission control
feature, and provides instructions to set the upstream admission
control as a percentage of the upstream channel capacity.
Provides brief explanation and instructions to activate
differential encoding on the upstream, which is a digital
encoding technique whereby a binary value is denoted by a
signal change rather than a particular signal level.
Provides instructions to activate forward error correction
(FEC). The Cisco uBR7200 series CMTS uses FEC to attempt
to correct any upstream data that might have been corrupted.
Provides instructions to activate upstream ports. Each upstream
port must be activated to enable upstream data transmission
from the CMs on the HFC network to the Cisco uBR7200 series
CMTS.
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
Configuring the Upstream Cable Modem Interface
3-11