3Com 3CDSG10PWR User Guide - Page 225
Problems, Possible Cause, Solution, Troubleshooting Solutions - console settings
UPC - 662705520902
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Troubleshooting Solutions 225 Problems Cannot connect to management using RS-232 serial connection Possible Cause Cannot connect to switch management using HTTP, SNMP, etc. No response from the terminal emulation software Faulty serial cable Incorrect serial cable Response from the terminal emulations software is not readable Self-test exceeds 15 seconds No connection is established and the port LED is on Software settings Faulty serial cable Software settings The device may not be correctly installed. Wrong network address in the workstation No network address set Device is in a reboot loop Wrong or missing protocol Faulty ethernet cable Faulty port Faulty module Incorrect initial configuration Software fault Solution 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 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 Telnet or the web, the maximum number of connections may already be open. Please try again at a later time. Replace the serial cable Replace 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 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 Download and install a working or previous software version from the console