Section II: Advanced Operations 49

Chapter 3

Troubleshooting
Here are suggestions on how to troubleshoot the twisted pair port and the fiber
optic port on the AT-PC232/POE Media Converter.
Problem 1: The two ports are connected to network devices, but the Link LEDs
for the ports are off.
Solution: The first step to resolving a link problem between the ports on the
media converter and the network devices is to set the operating mode of the unit
to the Smart MissingLink mode or the Link Test mode. These modes allow you to
use the Link LEDs to identify which port is unable to establish a link to its network
device. The operating mode is set with the Mode selector button.
After setting the unit to the Smart MissingLink or Link Test mode, observe the Link
LEDs again. If the Link LED for the twisted pair port is off, go to Problem 2. If the
Link LED for the fiber optic port is off, go to Problem 3.
Problem 2: The Link LED for the fiber optic port is on or blinking, but the Link LED
for twisted pair port is off.
Solution: The twisted pair port has not established a link with its network device.
Try the following:
Verify that the network device connected to the twisted pair port is powered on
and operating properly.
Verify that the twisted pair cable is securely connected to the port on the media
converter and to the port on the remote network device.
Try connecting another network device to the twisted pair port with a different
cable. If the twisted pair port is able to establish a link, then the problem is with
the cable or the other network device.
Problem 3: The Link LED of the twisted pair port is on or blinking, but the Link
LED of the fiber optic port is off.
Solution: The fiber optic port is unable to establish a link to its network device. Try
the following:
Verify that the network device connected to the fiber optic port is operating
properly.
Verify that the fiber optic cable is securely connected to the port on the media
converter and to the port on the remote network device.