3Com 3CBLSG48 User Guide - Page 208

Table 12, Problems, Possible Cause, Solution, Troubleshooting Solutions - replacement

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appendix d: troubleshooting 197 Table 12 Troubleshooting Solutions Problems Possible Cause Switch does not run; Power is disconnected. power LED is off. Solution Verify that the power cord is properly connected to the switch, and to the mains supply. Cannot connect to management using Console connection 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. Cannot connect to switch management using HTTP SNMP, etc 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. No response from the terminal emulation software Faulty serial cable Incorrect serial cable Software Settings Replace the serial cable. Replace the serial cable for a pin-to-pin straight/flat cable. Reconfigure the emulation software connection settings. Response from the Faulty serial cable terminal emulation Software Settings software is not readable Replace the serial cable. Reconfigure the emulation software connection settings. Self-test exceeds 15 seconds The device may not be correctly installed. Remove and reinstall the device. If that does not help, consult your technical support representative. No connection is LED established and the port is on Wrong network address in Configure the network address in the workstation. the workstation No network address set Configure the network address in the workstation. Wrong or missing protocol Configure the workstation with IP protocol. Faulty ethernet cable Replace the cable. Faulty port Replace the module. Faulty module Replace the module. Incorrect initial configuration Erase the connection and reconfigure the port.

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A
PPENDIX
D
:
T
ROUBLESHOOTING
197
Table 12
Troubleshooting Solutions
Problems
Possible Cause
Solution
Switch does not run;
Power is disconnected.
Verify that the power cord is properly connected to the
power LED is off.
switch, and to the mains supply.
Cannot connect to
Be sure the terminal emulator program is set to VT-100
management using
compatible, 38400 baud rate, no parity, 8 data bits and
Console connection
one stop bit.
Use the included cable, or be sure that the pin-out
complies with a standard null-modem cable.
Cannot connect to switch
Be sure the switch has a valid IP address, subnet mask,
management using HTTP
and, the default gateway is configured.
SNMP, etc.
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.
No response from the
Faulty serial cable
Replace the serial cable.
terminal emulation
Incorrect serial cable
Replace the serial cable for a pin-to-pin straight/flat cable.
software
Software Settings
Reconfigure the emulation software connection settings.
Response from the
Faulty serial cable
Replace the serial cable.
terminal emulation
Software Settings
Reconfigure the emulation software connection settings.
software is not readable
Self-test exceeds 15
The device may not be
Remove and reinstall the device. If that does not help,
seconds
correctly installed.
consult your technical support representative.
No connection is LED
Wrong network address in Configure the network address in the workstation.
established and the port
the workstation
is on
No network address set
Configure the network address in the workstation.
Wrong or missing protocol Configure the workstation with IP protocol.
Faulty ethernet cable
Replace the cable.
Faulty port
Replace the module.
Faulty module
Replace the module.
Incorrect initial
Erase the connection and reconfigure the port.
configuration