This object indicates the port's MDI/MDI-X switching status.
The normal(1) status indicates the port is configured to be
standard MDI as defined by the 10BaseT Standard for hub port
(allowing for connection to a chained hub). The crossover(2)
status indicates the port is configured to be in MDI-X mode
(allowing for connection to a 10BaseT end node). The
notSwitchable(3) status indicates the port is not switchable
between MDI and MDI-X mode.