User guide

Troubleshooting
3-4
PORT ACTIVITY
LED on any Port
is Off
This may indicate:
❑ Data cable is loose.
❑ The device at the other end of the connection has been turned
off.
❑ The port is disabled through the software.
Perform the following steps in sequence; you need not proceed to
the next step if the problem is resolved:
1. Make sure the data cables are secure.
2. Make sure the device at the end of the connection is turned on.
3. Call Allied Telesyn’s Technical Support.
PORT ACTIVITY
LED on any Port
is OFF
OFF may indicate that someone has manually disabled the port
through the software.
Perform the following steps in sequence; you need not proceed to
the next step if the problem is resolved:
1. Log on to Omega if you can and check the port status (Port
status and configuration><
port number >).
2. Refer to the “AT-S20 User’s Guide” to check that the port is
Disabled, or that someone has manually disabled the port through
the software for a specific reason. Verify that the reason no longer
exists before you enable this port (Port status and
configuration).
3. Call Allied Telesyn’s Technical Support.
POWER LED
is Off
If there is no power to the switch, it cannot function.
A POWER LED that is off may indicate:
❑ The voltage has dropped below acceptable levels.
❑ The power supply has failed, is malfunctioning, or loss of
power to the power supply.
❑ The power cord is loose.
❑ A rise in switch temperature because of fan failure.
Perform the following steps in sequence; you need not proceed to
the next step if the problem is resolved: