Cisco uBR7200 Series - Manual

Cisco uBR7200 Series

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Table of Contents:

  • Page 2 – Managing Cable Modems on the HFC Network; Configure Sync Message Interval; Command
  • Page 3 – Verify Sync Message Interval; Activate Cable Modem Authentication; Verify Cable Modem Authentication; Activate Cable Modem Upstream Address Verification
  • Page 4 – Verify Cable Modem Upstream Address Verification
  • Page 5 – Configure the Dynamic Map Advance Algorithm
  • Page 6 – Configure Per Modem Filters
  • Page 8 – Configure the Maximum Number of Hosts Attached to a Cable Modem
  • Page 9 – Verify Clear Cable Modem Reset; Clear Cable Modem Counters
  • Page 10 – Verify Clear Cable Modem Counters; Configure Traffic Shaping; Configure Downstream Rate Limiting and Shaping; Configure Upstream Rate Limiting and Shaping
  • Page 11 – Blind Strategies and Time Scheduled Combined
  • Page 12 – Guided Frequency Hop
  • Page 13 – Field
  • Page 14 – Spectrum Management Debug and Test Commands; Show Cable Hop Command
  • Page 16 – Debug and Test Commands; Polling Cable Modems
  • Page 17 – Enable SNMP
  • Page 18 – Monitoring and Maintaining Remote Querying; Understanding Show Command Responses; General Show Commands; show cable modem
  • Page 19 – Show Cable Modem
  • Page 23 – Show Cable Modem Maintenance
  • Page 24 – Show Interface Cable
  • Page 30 – Enhanced Show Interface Upstream Output
  • Page 31 – Show Interface Cable SID
  • Page 34 – Show Cable QoS Profile; Troubleshooting Using Cable Flap Lists
  • Page 35 – cable flap-list insertion-time—180 seconds
  • Page 37 – Following is a sample response to the show cable flap command:; Display the Flap List
  • Page 38 – Statistic
  • Page 40 – Troubleshoot with the Flap List
  • Page 41 – Set Cable Flap List Aging; Verify Cable Flap List Aging; Set Cable Flap List Insertion Time; Verify Cable Flap List Insertion Time
  • Page 42 – Set Cable Flap List Power Adjustment Threshold; Verify Cable Flap List Power Adjustment Threshold; Set Cable Flap List Miss Threshold
  • Page 43 – Verify Cable Flap List Miss Threshold; Set Cable Flap List Size; Verify Cable Flap List Size; Clear Cable Flap List
  • Page 44 – Customize Other Flap List Values and Related Commands; show int cable slot/port sid
  • Page 45 – Performing Amplitude Averaging; Output of the show cable modem command appears below:; cable upstream power-adjust noise; Enable or Disable Power Adjustment; no cable upstream power-adjust
  • Page 46 – Set Frequency Threshold to Affect Power Adjustment; no cable upstream freq-adj averaging; Syntax
  • Page 47 – Setting Downstream Test Signals; Configure Unmodulated Test Signals; Step
  • Page 48 – Configure PRBS Test Signals; Pinging Unresponsive Cable Modems; Ping a Cable Modem
  • Page 49 – Verify the Ping; Using Cable Interface Debug Commands; Debug Cable ARP Requests
  • Page 50 – Debug Environmental Monitor Messages; Debug Cable MAC Messages
  • Page 51 – Debug Cable Maps; Debug Cable Modems
  • Page 52 – Debug Cable Modem Ranging Messages
  • Page 53 – Debug Spectrum Management
  • Page 54 – Debug Upstream Channel Description (UCD) Messages; Managing the Cisco uBR7246 VXR Clock Card; Clear Clock Counters
  • Page 55 – Force Alternate Clock; Set Midplane TDM Clock as Primary Reference; Display Clock Values
  • Page 56 – Show Clock Hardware Information and Register Values; Show Clock Diagnostic Information
  • Page 58 – Show Clock Frames; Show General Information
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C H A P T E R

4-1

Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide

78-5897-01

4

Troubleshooting the System

This chapter contains troubleshooting information. The chapter includes the following sections:

•

Using a Cable Modem at the Headend to Verify Downstream Signals

•

Managing Cable Modems on the HFC Network

•

Polling Cable Modems

•

Understanding Show Command Responses

•

Troubleshooting Using Cable Flap Lists

•

Performing Amplitude Averaging

•

Setting Downstream Test Signals

•

Pinging Unresponsive Cable Modems

•

Using Cable Interface Debug Commands

•

Managing the Cisco uBR7246 VXR Clock Card

Using a Cable Modem at the Headend to Verify
Downstream Signals

You can use a Cisco uBR924 cable access router to verify the downstream signal originating from a
Cisco uBR7200 series universal broadband router. Be sure you configure the Cisco uBR924 according
to DOCSIS cable modem practises. To verify the downstream signal from a
Cisco uBR7200 series universal router using a Cisco uBR924, follow the procedure below:

Step 1

After the Cisco uBR924 is operational and you have an input signal between 0 and +5 dBmV, enter the
show controller c0 tuner command.

Step 2

Scan the output for the value corresponding to the signal to noise (SNR) estimate variable. If this value
is at least 35 dB, then you have an optimized signal. If the value is less than 34 dB, adjust the
upconverter at the cable headend.

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Summary

Page 2 - Managing Cable Modems on the HFC Network; Configure Sync Message Interval; Command

4-2 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Tips The SNR estimate for a cable modem installed at a headend should be between 35 dB and39 dB. Although the exact value displaye...

Page 3 - Verify Sync Message Interval; Activate Cable Modem Authentication; Verify Cable Modem Authentication; Activate Cable Modem Upstream Address Verification

4-3 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Verify Sync Message Interval To verify whether or not a sync message interval is configured, enter the show running-configcommand ...

Page 4 - Verify Cable Modem Upstream Address Verification

4-4 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network To activate cable modem upstream address verification, use the following cable interface configurationcommand. Verify Cable Modem ...

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