Cabletron Systems 520, 510 manual Symptom Probable Cause Corrective Action

		Problem Solving
	Table A-3. LED States
Symptom	Probable Cause	Corrective Action
Serial Port 1 or	There is low serial port	Ensure that serial port activity
Serial Port 2	activity or no serial port	is present. If the Serial Port
Activity LED is	activity.	Activity LED still fails to turn
off.		on, then turn the unit off by
		removing it from the power
		supply. Check that the Serial
		Port Activity LED blinks
		during the LED powerup self-
		test.
		If the Serial Port Activity LED
		blinks, then the Serial Port
		Activity LED portion of testing
		has passed. If the Serial Port
		Activity LED still fails to turn
		on, then the router is defective.
	Ensure that the cable	Replace the router.
	has activity on it. If the
	LED still fails to turn
	on, then the port is
	defective.
Console	Wrong cable.	Try connecting the console
terminal does		terminal to the router using a
not appear work.		null modem cable with the
		appropriate 8-pin MJ RS232
		connector on the router end.
	Wrong baud rate.	Send a BREAK to the console
		and then press <Return>
		several times until the console
		responds. Proper baud rates are
		300, 1200, 2400, 4800, 9600,
		19200, and 38400.
	Defective router.	Replace the router.

A-9