3Com 2916-SFP User Guide - Page 193

Problems, Possible Cause, Solution, Troubleshooting Solutions

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Troubleshooting Solutions 193 Table 12 Troubleshooting Solutions Problems Possible Cause Solution Switch does not run; power Power is disconnected. LED is off. 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 default gateway 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. Please try again at a later time. No response from the terminal emulation software Faulty serial cable Incorrect serial cable Replace the serial cable Replace serial cable for a pin-to-pin straight/flat cable Reconfigure the emulation software connection settings. Software settings Response from the terminal Faulty serial cable emulations software is not readable Software settings 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 established and the port LED 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 Faulty port Faulty module Incorrect initial configuration Replace the cable Replace the module Replace the module Erase the connection and reconfigure the port

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Troubleshooting Solutions
193
Table 12
Troubleshooting Solutions
Problems
Possible Cause
Solution
Switch does not run; power
LED is off.
Power is disconnected.
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
default gateway 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. Please 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 serial cable for a pin-to-pin straight/flat cable
Reconfigure the emulation software connection settings.
Response from the terminal
emulations software is not
readable
Faulty serial cable
Software settings
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
established and the port
LED is on
Wrong network address in
the workstation
No network address set
Wrong or missing protocol
Faulty ethernet cable
Faulty port
Faulty module
Incorrect initial
configuration
Configure the network address in the workstation
Configure the network address in the workstation
Configure the workstation with IP protocol
Replace the cable
Replace the module
Replace the module
Erase the connection and reconfigure the port