Toshiba V Series User Manual page 223

Network cable
check
6F8C0904
Verification items
1) Is the coaxial cable (10BASE5 or
10BASE2) grounded to a single
point with a resistance to ground of
100 Ω or less ?
2) Do all nodes on the network
respond to PING correctly?
3) Is the collision (COL) indicator
blinking frequently?
4) Are the error counters read out from
the RAS information increasing as
time passes?
Error counters:
Alignment error, Short packet, CRC
error
8.5 Troubleshooting
Resolution
1) Coaxial cables must be grounded to
a single point with a resistance to
ground of 100 Ω or less.
2) Inspect the coaxial cables for missing
termination resistors and damage.
3) Since network loading is heavy:
• Transmission efficiency can be
degraded (TCP), and
• There is an increased possibility of
packet loss (UDP).
Therefore, the circuit usage conditions
should be reviewed.
4) Check whether there are any
defective (or substandard)
connections on the cables and at
the MAUs and T-connectors.
Check for the presence of noise
sources in the vicinity of the
network cables.
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