Cisco UBR904 Troubleshooting Guide - Page 5

Troubleshooting Steps, Step 1-Understand How Basic Initialization Works

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Step 1-Understand How Basic Initialization Works Troubleshooting Steps To troubleshoot a malfunctioning cable modem, perform the following tasks: • Step 1-Understand How Basic Initialization Works • Step 2-Connect to the Cable Modem • Step 3-Display the Cable Modem's MAC Log File • Step 4-Interpret the MAC Log File and Take Action • (Optional) Step 5-Use Additional Troubleshooting Commands Step 1-Understand How Basic Initialization Works Before you troubleshoot a Cisco uBR904 cable modem, you should be familiar with the cable modem initialization process. See Figure 2 and Table 1. Understanding this flowchart and sequence of events will help you determine where and why connections fail. The sequence numbers shown in Figure 2 are explained in Table 1, which appears after the illustration. The cable modem will complete all the steps in this flowchart each time it needs to reestablish ranging and registration with the CMTS. Troubleshooting Tips for the Cisco uBR904 Cable Modem 5

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Step 1—Understand How Basic Initialization Works
Troubleshooting Tips for the Cisco uBR904 Cable Modem
5
Troubleshooting Steps
To troubleshoot a malfunctioning cable modem, perform the following tasks:
•
Step 1—Understand How Basic Initialization Works
•
Step 2—Connect to the Cable Modem
•
Step 3—Display the Cable Modem’s MAC Log File
•
Step 4—Interpret the MAC Log File and Take Action
•
(Optional) Step 5—Use Additional Troubleshooting Commands
Step 1—Understand How Basic Initialization Works
Before you troubleshoot a Cisco uBR904 cable modem, you should be familiar with the cable
modem initialization process. See Figure 2 and Table 1. Understanding this flowchart and sequence
of events will help you determine where and why connections fail.
The sequence numbers shown in
Figure 2 are explained in Table 1, which appears after the
illustration. The cable modem will complete all the steps in this flowchart each time it needs to
reestablish ranging and registration with the CMTS.