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SwitcHub-2s User’s Guide
Hardware Description 2-5
For example, if network utilization reaches 1%, the LED labeled 1% will light up.
However, if network utilization rises above 1% (e.g., 35%), the LED labeled 35
and all the other LEDs before it (i.e., 1, 5, 10 and 20) will also light up in rapid
succession. These indicators monitor the share of valid network frames handled
by each port within a 10Mbps or 100Mbps bandwidth, depending on the Ethernet
type currently selected on the back panel. They provide a quick way to monitor
the current traffic load relative to the network’s capacity.
Forward Display Mode (Forward%) - The statistical indicators show the percentage of
packets that must be forwarded by bridging hardware to the other port on the
switching hub (i.e., another LAN segment or connected workstation). When
viewing the
Forward% indications, remember that under normal conditions, the
SwitcHub forwards 100% of all Ethernet packets that must be transferred among
the connected LAN segments at line speed.
Filter Display Mode (Filter%)- The statistical indicators show the percentage of
packets that must be filtered from the switching hub by bridging hardware
because the destination address is on the same segment connected to the
receiving port. When viewing the
Filter% indications, remember that under
normal conditions, the SwitcHub filters 100% of all Ethernet packets that
belong to the local LAN segments at line speed.
Collision Display Mode (Coll%)- 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