sFlow on Juniper

Dear all
I'm playing with sFlow on Juniper switches EX-4200 (JunOs 9.5r27). On
all samples I receive from the switch I see ifDirection=2 that
according to the sFlow specs means half-duplex (http://www.sflow.org/developers/diagrams/sFlowV5CounterData.pdf
), whereas I'm sure that the port is full-duplex. Is my interpretation
of IfDirection value correct ?

Thanks in advance, Luca

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If you can not measure it, you can not improve it - Lord Kelvin