10BASE-T Stackable Hubs
The hub's front panel display features the following indicators:
♦ Port Status Indicators
Each of the ports has an LED status indicator for reporting its link and
activity status, and showing whether or not it has been partitioned.
The port status indicators always come on when the hub is powered on.
After the POST (Power-On Self Test) is completed, they normally go off.
The following describes each indicator and the meaning of each
The indicator of a port lights green when the port is connected to a
powered Ethernet station. If the station to which the hub is connected
is powered off, or if there is a problem with the link, the indicator is
The indicator of a port blinks green when the port is currently
receiving packets on the connected segment. Upon reception, each
data packet will be transmitted through all other connected ports on
the hub (or in the hub stack).
The indicator of a port blinks amber when the port is automatically
partitioned due to an abnormal network condition.
A port is temporarily partitioned when too many line errors or too
many collisions are detected on the port. While the segment is
automatically partitioned, the port continues to receive data. However,
data is not transmitted out of the segment (from the port). When the
problem is corrected or a valid data packet is received from the port,
the port is automatically reconnected.
External Features and Indicators