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Dual-Speed Stackable Hubs User’s Guide
Understanding Indicators 13
This indicator lights green when the hub is receiving power; otherwise,
it is off.
♦ Collision Indicators (Col 10M/ Col 100M)
These indicators indicate data collisions on the respective 10Mbps
Ethernet or 100Mbps Fast Ethernet segments connected to the hub. (If
several hubs are stacked or linked together, all of them should detect
and indicate the same collision, since collisions span the entire network
segment.) Whenever a collision is detected, the respective COL indi-
cator will briefly blink amber.
♦ 10Mbps and 100Mbps Utilization Indicators
The utilization bar graphs provide a quick reference on the current traf-
fic load relative to the total available 10Mbps or 100Mbps network
bandwidth. The graphs display a measure of the percentage of band-
width in use on the respective network segment. All data packets are
counted, whether valid or not.
Port State Indicators
There is one port state indicator for each of the twisted-pair ports on the
hub. Each port’s LED status indicator reports the port’s link and activity
status, and shows whether or not the port has been partitioned.
The following describes each indicator and the meaning of each condition:
♦ Link (steady green)
The indicator of a port lights green when the port is connected to a pow-
ered Ethernet or Fast Ethernet station. If the station to which the hub is
connected is powered off, or if there is a problem with the link, the LED
will remain off.