The configured duplex setting for this ethernet interface. The
operational value is reported in this table entry's corresponding
usdEthernetIfOperDuplexMode object.
NOTE, configuration dependency:
Setting this object to values other than 'autoDuplex' takes effect only
when the corresponding usdEthernetIfSpeed object is simultaneously set to
other than 'autoNegotiate'.
Otherwise (i.e. this object is set to 'autoDuplex', AND/OR corresponding
usdEthernetIfSpeed object is set to 'autoNegotiate'), duplex mode is
negotiated.