3Com 3CRDSF9PWR manual No connection and the port LED is off Lost Password

240APPENDIX D: TROUBLESHOOTING

■No connection and the port LED is off

■Lost Password.

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
	Software settings	Reconfigure the emulation software connection
		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 20	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	No network address set	Configure the network address in the workstation
	Wrong or missing	Configure the workstation with IP protocol
	protocol
	Faulty Ethernet cable	Replace the cable
	Faulty port	Consult your technical support representative
	Faulty SFP transceiver	Replace the SFP transceiver
	Incorrect initial	Erase the connection and reconfigure the port
	configuration
Device is in a reboot loop	Software fault	Download and install a working or previous software
		version from the console