3Com 3CBLSG48 User Manual page 208

Table 12 Troubleshooting Solutions
Problems
Switch does not run;
power lED is off.
Cannot connect to
management using
Console connection
Cannot connect to switch
management using HTTP
SnMP, etc.
no response from the
terminal emulation
software
Response from the
terminal emulation
software is not readable
Self-test exceeds 15
seconds
no connection is lED
established and the port
is on
Possible Cause
Power is disconnected.
Faulty serial cable
Incorrect serial cable
Software Settings
Faulty serial cable
Software Settings
The device may not be
correctly installed.
Wrong network address in Configure the network address in the workstation.
the workstation
no network address set
Wrong or missing protocol Configure the workstation with IP protocol.
Faulty ethernet cable
Faulty port
Faulty module
Incorrect initial
configuration
Solution
Verify that the power cord is properly connected to the
switch, and to the mains supply.
Be sure the terminal emulator program is set to VT-100
compatible, 38400 baud rate, no parity, 8 data bits and
one stop bit.
Use the included cable, or be sure that the pin-out
complies with a standard null-modem cable.
Be sure the switch has a valid IP address, subnet mask,
and, the default gateway is configured.
Check that your cable is properly connected with a valid
link light, and that the port has not been disabled.
Ensure that your management station is plugged into the
appropriate VlAn to manage the device.
If you cannot connect using the web, the maximum
number of connections may already be open. Try again at
a later time.
Replace the serial cable.
Replace the serial cable for a pin-to-pin straight/flat cable.
Reconfigure the emulation software connection settings.
Replace the serial cable.
Reconfigure the emulation software connection settings.
Remove and reinstall the device. If that does not help,
consult your technical support representative.
Configure the network address in the workstation.
Replace the cable.
Replace the module.
Replace the module.
Erase the connection and reconfigure the port.
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