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No.
Symptom
Probable causes
4
Program stops by
1) TELNET
itself during
communication cuts
automatic operation.
off by itself without
a LOGOUT or BYE
command being
issued.
2) TELNET parameter
was set to stop
operation during
logout.
3) Communication
status continues for
a fixed period and
then cuts off
automatically at
timeout.
4) No-response status
continues for a
fixed period versus
the keep-alive
packet and then cuts
off automatically at
timeout.
5) Ethernet unit is
defective.
Checkpoints
• Always use a LOGOUT or BYE
command to terminate a TELNET
communication.
• Check the TELNET
• Reset the parameter so operation
parameter to find if it was set
continues during logout.
to stop operation during
logout.
• Check the TELNET
• Set so communication time does not
parameter to find if
exceed the timeout limit. Otherwise
communication status is
increase the communication timeout
longer than the time set for
period or disable the timeout function.
timeout.
• Check if a cable is detached
• Check the network and repair/restore any
or power supply for the HUB
problem locations.
or other equipment is off.
• Check if operating problems
• Replace a device having operating errors
are occurring in devices such
with another device.
as the HUB due to noise, etc.
• Too short of a period was set
• Set the no-response timeout period to
for the no-response timeout
match the network structure and traffic
period.
conditions. Or disable the timeout
function.
• Try substituting with another
• If operation returns to normal, then the
Ethernet unit.
Ethernet unit is defective so replace it.
2-13 Troubleshooting
Action
2
33
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