Cisco Systems uBR7200 Series Guia de Resolução de Problemas descarregar pdf (Página 47)

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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide

78-5897-01

Chapter 4 Troubleshooting the System

Setting Downstream Test Signals

The following example shows how to change the power adjustment method when the frequency

adjustment packet count reaches 50 percent:

router(config-if)# cable upstream 0 freq-adj averaging 50

Setting Downstream Test Signals

This feature provides configuration commands that allow you to create downstream test signals. Both

Pseudo Random Bit Stream (PRBS) and unmodulated carrier test signals are now supported.

A PRBS test signal is a random data pattern that has been modulated to look like a real data stream. An

unmodulated test signal is a continuous sine wave that looks like a carrier wave on the downstream

transmission.

See the following required tasks to create PRBS and unmodulated carrier test signals:

• Configure Unmodulated Test Signals

• Configure PRBS Test Signals

Configure Unmodulated Test Signals

Table 4-28 Cable Upstream Freq-adj Averaging Syntax Descriptions

Syntax Valid Values

n Specifies the upstream port number.

averaging Specifies that a percentage of frequency adjustment packets is

required to change the adjustment method from the regular power

adjustment method to the noise power adjustment method.

% of frequency adjustment Specifies the percentage of frequency adjustment packets required to

switch from the regular power adjustment method to the noise power

adjustment method. Valid range is from 10 through 100 percent.

Table 4-29 Instructions to Conﬁgure Unmodulated Test Signals

Step Command Purpose

# router(config-if)# cable downstream if-output

continuous-wave

Generates an unmodulated continuous-wave signal

on the downstream channel. The interface is shut

down.

Router(config-if)# no cable downstream if-output

Stops sending test signals.

Note Remember to reenable the

interface to resume normal

operations.

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