Cabletron Systems SmartSTACK STS16-20RM Installation And User Manual page 230

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Procedure D
Use this procedure if one device connected to the switch is having a communication
problem. The ERR LED and the DIAG LEDs are off, and other attached devices
can communicate through the switch:
1. Check the port LEDs.
— If the port INSRT LED is on, the problem is probably external to the
switch. Go to Step 2.
— If the port INSRT LED is off, the port is probably disabled. Check that the
port configuration matches the attached device, and then go to Step 3.
2. If the INSRT LED on the failing port is on, and the attached device still cannot
communicate:
— If the attached device is directly connected, it might be set up incorrectly.
Go to step 4.
— In a shared environment, check the segment cabling and the media access
unit.
— If problem persists, try another identically configured port on the switch.
If the new port works there is a problem with the failed port. Obtain
service. Contact your place of purchase.
3. Do the following:
— Using the console of the SNMP manager, check to see whether the failing
port is disabled. If it is, enable it. A port will disable itself when the Cfg
Loss Threshold parameter is exceeded (see "Cfg Loss Threshold" on
page 105). This can be caused by poor cables, a faulty station connected
to the switch, or a bad port on the switch.
— If the port is not disabled, disconnect the port cable. Try moving the cable
to another port until service can be arranged. If the switch can be
temporarily removed from service, connect a console and reset the switch
with diagnostics to see whether the port passes diagnostics and initializes.
If it does not, the problem is in the switch. In this case, contact technical
support as described in Chapter 11, "Getting in Touch with Technical
Support".
4. Restart communications program on the failed connected device.
— If the communication program appears to start without errors, observe the
INSRT LED on the switch port. If it is on, the problem may have gone
away. Check the Cfg Loss Threshold parameter in the Port
Configuration screen (page 104) for possible causes of the failure.
SmartStack STS16-20RM/STS16-20FRM Token Ring Switches, P/N: 9032957-01 Troubleshooting