Planet WH-2400M, User Manual, Page: 16 / 60

Hardware Overview
PLANET Web Hub
2-6
Collision Ratio %
The Collision % LEDs indicate the percentage of collision. Collisions occur
when two or more devices connected to a hub attempt to transmit data
simultaneously. When a collision occurs, the system aborts then transmits after a
random wait period.
Figure 2.10 Collision %.
The Collision percent can be calculated using the following formula.
Collision Ratio = (number of packets collided / number of packets transmitted) *
100.
FCS/Align Err
The FCS/Align Err LED glows, amber indicating there were corrupted packets
during transmissions. Alignment error occurs, when not all the bytes in a packet
are received.
Figure 2.11 FCS/Align LED.