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9.Network check items (Ethernet Port)
| Check items | Countermeasure | |||
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Transmission | 1. | Is the twisted pair cable connected | 1. | Verify the twisted pair cable connections between the | |
medium |
| between the Ethernet Port and HUB? |
| Ethernet Port and HUB. | |
installation |
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2. | How long (in meters) are the twisted pair | 2. | The maximum segment length for | ||
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| cable (i.e. segment lengths)? |
| 100 meters. | |
Network cable | 1. | Do all ports on the network respond to ping | 1. | Inspect the twisted pair cables for missing termination | |
check |
| correctly? |
| resistors and damage. | |
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| 2. | Is the collision frequently happen? | 2. | Since network loading is heavy: | |
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| Can you confirm the table indicating the | • | Transmission efficiency can be degraded (TCP), and | |
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| collision? | |||
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| • | There is an increased possibility of packet loss (UDP). | ||
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| Therefore, the circuit usage conditions should be reviewed. | ||
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| 3. | Are the error counters read out from the | 3. | Check whether there are any defective (or substandard) | |
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| RAS information increasing as time |
| connections on the cables and HUB. | |
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| passes? |
| Check for the presence of noise sources in the vicinity of | |
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| Error counters: Alignment error, Short |
| the network cables. | |
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| packet, CRC error |
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