Cabletron Systems 510 Manual De Usuario

A-9

Problem Solving

Serial Port 1 or 
Serial Port 2 
Activity LED is 
off.

There is low serial port 
activity or no serial port 
activity.

Ensure that serial port activity 
is present. If the Serial Port 
Activity LED still fails to turn 
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 
has activity on it. If the 
LED still fails to turn 
on, then the port is 
defective.

Replace the router.

Console 
terminal does 
not appear work.

Wrong cable.

Try connecting the console 
terminal to the router using a 
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.