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Troubleshooting Guide 2-7

2. What tools do you have for troubleshooting? Have you used the tools in this situation, and what were the

results? For example:

a. Using a Lanalyzer or sniffer (refer to its manual for operating instructions)

1.) Did you get a trace of the failure?

2.) Do you have a trace of normal network activity?

3.) What is the trafﬁc rate, normal and at the time(s) of the failure(s)?

b. Using SPECTRUM Element Manager for Windows or SPECTRUM management applications (refer to

the respective manuals for operating instructions), check for the following:

1.) What information does the management application provide about the problem? Does it show you

what is happening?

2.) Can you see

if the whole network is down? Or, how widespread is the problem?

c. Using some other management software or packet analyzer

d. Using a cable tester

e. Using a LAN-MD or LAN-Specialist (refer to the respective manual for operating instructions)

f. Using a layout of the network (Faxable format is probably the most frequently needed.)

3. Where do you start? The following provides suggestions on what to do:

a. Check to see if there has been any similar problems in the last 30-60 days? Go straight to the trouble

spots and do not waste any time. Check the following items:

1.) Swap out (shotgun) any suspected defective devices with known good working spare devices.

(This shotgun method can be quick and effective.)

2.) Refer to system records and service contract information about replacements and on-site spares.

Good records on what happened before and how it was solved can save hours of troubleshooting.

b. If a known trouble spot is not the problem, do the cut by half algorithm as follows:

1.) Separate the network or problem area into two halves in order to get part of it working. Use

bridges or routers of the appropriate technology as needed.

2.) Keep isolating the problem down as far as you can until you get to the troubled spot(s).

For example: There are two hubs connected together. Isolate one from the other so that both can

operate independently. See if one or both can come up and operate properly. Chances are one

should come up. If not, refer to the respective manuals for operating and troubleshooting

information.

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