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Fast EtherHub-12se User’s Guide
Hardware Reference 4-3
Statistical Display for System Performance
8WLOL]DWLRQ'LVSOD\0RGH - (8WLOL]DWLRQ) The statistical indicators show the percentage
of valid data passing through each port compared to overall network bandwidth
(updated every 0.5 seconds). There are 5 LEDs representing the percentage of
network utilization. The corresponding LEDs light up to show that the utilization
of LAN bandwidth has reached this percentage. When active, these LEDs behave
like a stereo’s equalizer display.
For example, if network utilization reaches 1%, the LED labeled 1% will light up.
However, if network utilization rises above 1% (e.g., 30%), the LED labeled 30
and all the other LEDs before it (i.e., 1, 5 and 15) will also light up in rapid
succession. These indicators monitor the share of valid network frames handled
by each port within a 100 Mbps bandwidth. They provide a quick way to monitor
the current traffic load relative to the network’s capacity.
&ROOLVLRQ'LVSOD\0RGH (&ROOLVLRQ)- The statistical indicators show the percentage
of packet collisions occurring out of the total packets transmitted by the port.
Collisions occur when two or more devices connected to a hub attempt to transmit
data simultaneously on the network. When a collision occurs, devices pause and
then re-transmit after a pseudo-random wait period. Because wait periods differ
among devices, successive collisions become increasingly improbable.
The Collision LEDs assist the network manager in monitoring the percentage of
packet collisions occurring relative to the total packets transmitted by each port.
The collision indicators are labeled by row to indicate the percentage of
collisions encountered by the corresponding port. When collisions reach a
level marked on the front panel display, the corresponding LED lights up. For
example, if packet collisions reach 1%, the LED labeled 1% will light up.
However, if collisions go beyond 1% (e.g., 15%), the LED labeled 15
+
% and all
the other LEDs before it (i.e., 1, 3, 5 and 10) also light up in rapid succession.