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- PAR indicator (For FDH-608/FDH-616)
Color : Green
Label : Activity
The hub possesses one such LED on its front panel. This indicator shines in a
steady green when the two nodes are transmitting data at the same time. When a
collision occurs, the two end nodes that are attempting to transmit data simultane-
ously back off and try again at different time intervals.
Troubleshooting
The different LEDs displayed on the hub's front panel help users manage their
network. It can happen, though, that some of them may not function properly or
alert users to certain types of problems. A list of common problems is included
here to help users diagnose whether their network difficulties are related to the hub
or to external factors.
The link LED of a connected port does not shine: If a front panel's link LED
does not shine when a device is connected, users should check the following to
make sure the connection has been established properly:
- Check that the connected device is turned on. Also, the adapter used to
power the end node device should be checked to see if it is defective.
- Length limits. Remember that the length limit for a connection between an
end node and a hub cannot exceed 100 meters.
- Cable being used for the connection. Straight-through cables are used to
interconnect a hub to another hub (via an uplink port), a station or a server.
- Quality of the cable being used. The cable begin used for the connection
should be checked for defects.
- The plug at both ends of the cable should be checked. A loose plug can
result in a faulty connection.
If none of these conditions are occurring, the malfunction may be related to the
hub itself. In this case, the hub should be brought back to the retailer for a com-
plete hardware diagnostic.
The power indicator does not shine when the hub is turned on. In this
case, it is recommended that both the cable and the power outlet should be tested
with another functioning device to make sure that the problem does not come from
the hub itself.
If either the connection cable or the power outlet is defective, they should be
replaced. The hub's location should be changed if the power outlet cannot be
replaced.
If, however, the problem comes from the hub itself, it should be brought back to
the retailer for a professional diagnosis.
Network Management
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