Troubleshooting Solutions 225

Problems

Possible Cause

Solution

 

 

 

 

 

 

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

RS-232 serial connection

 

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

 

Be sure the switch has a valid IP address, subnet mask

switch management

 

and default gateway configured

using HTTP, 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 Telnet or the web, the

 

 

maximum number of connections may already be

 

 

open. Please try again at a later time.

 

 

 

No response from the

Faulty serial cable

Replace the serial cable

terminal emulation

Incorrect serial cable

Replace serial cable for a pin-to-pin straight/flat cable

software

 

Reconfigure the emulation software connection

 

 

 

Software settings

settings.

 

 

 

 

 

Response from the

Faulty serial cable

Replace the serial cable

terminal emulations

Software settings

Reconfigure the emulation software connection

software is not readable

 

settings.

 

 

 

 

 

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

Wrong network address

Configure the network address in the workstation

established and the port

in the workstation

 

LED is on

 

Configure the network address in the workstation

 

No network address set

 

Configure the workstation with IP protocol

 

 

 

Wrong or missing

Replace the cable

 

Replace the module

 

protocol

 

Replace the module

 

Faulty ethernet cable

 

Erase the connection and reconfigure the port

 

Faulty port

 

 

 

Faulty module

 

 

Incorrect initial

 

 

configuration

 

 

 

 

Device is in a reboot loop

Software fault

Download and install a working or previous software

 

 

version from the console

 

 

 

Page 225
Image 225
3Com 2924-PWR manual Problems Possible Cause Solution