Filter
Top Products
EtherHub 1500 System User’s Guide
2-8 Hardware Description
These LEDs monitor the share of valid network frames
transmitted by this hub within a 10Mbps bandwidth. They
provide a quick way to monitor the current traffic load relative
to the network’s capacity.
Collision
Label (%) Color Function
1% 3% 5% Green Indicates the percentage of packet
10% Amber (yellow) collisions occurring out of the total
15+% Red packets received by the hub.
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 received by the hub. Similar to Utilization LEDs, the
Collision LEDs have 5 numbers representing collision percentage.
When collisions reach a level marked on the LED 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) will also light up in rapid succession.
F
When more than 31 consecutive collisions occur on the cable
segment connected to a port, that port is automatically partitioned
by the hub. The hub automatically reconnects this port when a data
packet longer than 512 bits (normal) is transmitted or received by
the partitioned port without collision. This applies to all STP ports
and the ALT PORT.