Chapter 13: Troubleshooting
[2]Problems concerning the network and appropriate countermeasures (when communications are unstable)
Symptom | Check points | Check details | Countermeasures |
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| Make sure the external conductive | Ground properly, according |
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| shields of all the coaxial cables are |
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| to section |
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| connected to ground at one point |
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| Are the shield wires of the AUI | Ground according to the |
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| cables properly connected to | manufacturer's instruction |
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| ground? | manuals |
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| Does each station respond properly | Check the power and |
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| cables of any station that |
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| to a Ping command? |
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| doesn't respond properly. |
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| Check the contacts in |
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| Is the collision lamp lit frequently? | cables and connectors. |
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| Check for abnormalities |
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| using an analyzer. |
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| Communication |
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| Are repeaters used in less than 4 |
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| route |
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| layers |
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| Is each segment within the |
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| maximum length? |
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| Are termination resistors installed at | Review the configuration |
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| both ends? | according to section |
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Unable to |
| Is the number of devices connected |
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| in each segment within the specified |
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communicate, |
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| range? |
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or unstable |
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| Are 3 or fewer segments used to |
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communication |
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| connect the equipment? |
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| Check the power supply |
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| Is power to the repeaters turned on? | and power cable, as well |
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| as the voltage. |
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| Are the IP addresses for the network | Check the IP addresses |
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| and support tools using an |
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| set properly? | analyzer. |
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| Are the station numbers of the | Check the IP addresses |
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| and support tools using an |
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| equipment set properly? |
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| analyzer. |
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| Participating | Are the equipment parameters set | Check the equipment |
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| stations | parameters using support |
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| properly? |
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| equipment | tools. |
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| settings | Are the CD (carrier detection) | Check the communication |
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| indicators lit consecutively or | cables, and the AUI power |
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| intermittently? | supply. |
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| Are the SD (send) indicators lit |
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| consecutively or intermittently? | settings. |
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| Are the LK (link) indicators lit |
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| consecutively? | parameter settings |
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