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Troubleshooting Procedures Section 8-4
8-4-6 Network Connection Problems
Is the LNK indicator
lit?
Did all nodes
fail to respond to ping
command?
Is the twisted-pair
cable secured?
END
Firmly secure the cable.
Power may not be being supplied to the hub.
Y
N
Y
N
N
Did a particular
node fail to respond to
ping command?
The remote node may not support ICMP.
Y
N
Is the remote
node functioning as an
FTP client?
Y
N
Y
Only SD indicator
is flashing.
Connect by FTP.
Is the twisted-pair
cable between the Ethernet Unit
and the hub straight
cable?
Use straight cable.
N
Y
Network connection problem occurred.
Go through the procedure in
Startup Problems before
starting this procedure.
Execute the ping
command for all nodes
connected to the network.
Replace first the twisted-pair cable, then the hub,
and then the Ethernet Unit, in order.
The twisted-pair cable for that node may be
disconnected.
Execute FINS PROTOCOL
STATUS READ.
If the following parameters are counted, the corresponding
communications services may not be possible with the remote
node.
[IP status] (2) (3) (5) (6) (All communications services)
[ICMP status] (5) (6) (7) (8) (ping)
[TCP status] (3) reception status (4) (5) (6) (FTP, TCP sockets)
[UDP status] (1) (2) (3) (FINS communications, UDP socket)
If the following parameters are counted, the load at the Ethernet
Unit may be too high. Adjust the user applications.
[IP status] (4) (8) (9)