Setting this object to autoNegotiate(1) will cause
auto-negotiation to be enabled on this port.
Setting this object to forceTo100TXHD will cause
auto-negotiation to be disabled on this port, and
cause the operational type of the MAU on this port
(as reported by rpMauType) to transition to
dot3MauType100BaseTXHD.
Setting this object to forceTo10THD will cause
auto-negotiation to be disabled on this port, and
cause the operational type of the MAU on this port
(as reported by rpMauType) to transition to
dot3MauType10BaseTHD.