Additional status information for the port. The
value is a sum. It initially takes the value zero,
then for each state that is true, 2 raised to a
power is added to the sum. The powers are
according to the following table:
State Power
Transmit 0
Receive 1
Collision 2
Transmit state indicates that at least one packet
was transmitted by the port in the last polling
period. Receive state indicates that at least one
packet was received by the port in the last
polling period. Collision state indicates that
at least one collision was detected on the port
in the last polling period.
Note that if a state is not applicable to a
particular port or additional status is not
supported on a particular port, its value is
always false for that port.