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Understanding Indicators16
Hub State Indicators
♦ Power Indicator
This indicator lights green when the hub is receiving power; otherwise,
it is off.
♦ Collision Indicators (COL10M and COL100M)
These indicators indicate data collisions on the respective 10Mbps
Ethernet or 100Mbps Fast Ethernet segments of the hub. (If several
hubs are stacked or linked together, all of them should detect and indi-
cate the same collision, since collisions span the entire network
segment.) Whenever a collision is detected, the respective COL indi-
cator will briefly blink amber.
♦ Segment Utilization % (10M Utilization % and 100M Utilization
%)
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.
♦ HUB ID Indicator
The HUB ID readout shows the ID (group) number of the hub within
the hub stack. The hub’s ID is automatically set when the hub is placed
in a hub stack and powered on. In an unmanaged stack (all slave mod-
els), all IDs will read “0.” In a stack with a master (intelligent) model,
the master hub will detect the other hubs in the stack and automatically
assign ID numbers.