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.