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Troubleshooting Guide 2-5

4. Check to see if the network has been changed recently in any way by adding, removing, upgrading or

reconfiguring any of its elements?

Was the problem narrowed down to one of the categories in Chapters 3 through 9?

If YES, refer to the appropriate chapter for instructions on how to remedy the most common prob-

lems in that category. If NO, go to step 5.

5. Look at the release notes to see if there are any incompatibilities or known issues. Check the revisions to

get a clue of what could be happening between devices. Was the problem narrowed down to one of the

categories in Chapters 3 through 9?

If YES, refer to the appropriate chapter for instructions on how to remedy the most common prob-

lems in that category. If NO, go to Section 2.3.

2.3 Develop Theories

Use the following guidelines to help determine the location and identity of the problem.

1. Develop plans to test the problem areas of the network by systematically eliminating those areas that are

trouble free from those that are not. Use one or more of the following troubleshooting methods:

a. Isolate the problem to one part of the network. Refer to Section 2.6 for details.

b. Go to the speciﬁc modules. Refer to the associated manuals for operating and troubleshooting

information.

2. Remember the basics.

a. Check the power and cable connections. Be aware of building electrical problems, for noise, grounds,

spikes, brownouts, and outages.

b. Also, check any uninterruptible power supplies (UPS) connected to the devices. The UPS can fail too.

Is there any construction going on? Things could be happening to fragile data links.

c. Make sure the network is whithin speciﬁcations.

3. Narrow down the problems by considering only the information relevant to the problem, but don’t

completely discount the possibility of a remote problem affecting the network.

2.4 Test the Theories

To test the theories and make sure the problem has been corrected, proceed as follows:

1. Identify the course of action, specific steps, and then perform each step.

2. Try things one at a time, do not change all variables at once.

3. Record your progress by documenting what has actually been tried, the parts swapped, etc.

4. Observe the network and/or check with the users. Did your corrective action fix the problem? If not, did it

change any of the symptoms, and if so, how?

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