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Chapter 6 - Network Management
LED Indicators
The hub's front panel contains indicators called light emitting diodes or LEDs.
LEDs are used to make a quick diagnostic of the network's status. They allow
users to know, at a glance, what problems the network is encountering.
Various LEDs, related to different functions, are displayed on the front panel.
There are five types of LEDs:
- PWR indicator
: (For FDH-608/FDH-616)
Color : Green
Label : Power
This indicator lights up in green whenever the hub is connected to the wall
adapter. If the green light fails to shine steadily, contact your dealer.
- 10M COL
indicator: (For FDH-608/FDH-616)
Color : Yellow
Label : Collision
- 100M COL
indicator: (For FDH-608/FDH-616)
Color : Yellow
Label : Collision
A collision occurs whenever two end nodes are sending data at the same time
on the network. Collisions are frequent in a Fast Ethernet network. When a colli-
sion occurs, the two end nodes that are attempting to transmit data simultaneously
back off and try again at different time intervals.
However, if collisions are too frequent, this may be a sign of:
- Network overload
- Device malfunction
- Cabling problems
Network Management
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