3Com 3CRDSF9PWR-US - OfficeConnect Managed Fast Ethernet PoE Switch User Manual page 115

Duplex — Displays the port duplex mode. This field is configurable
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only when the port speed is set to 10M or 100M or 1000M per
second. The possible field values are:
Full — The interface supports transmission between the device and
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its link partner in both directions simultaneously.
Half — The interface supports transmission between the device
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and the client in only one direction at a time.
Auto — Indicates that port duplex mode is set to an optimal value
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based on advertised capabilities.
PVID — VLAN ID assigned to untagged frames received on this port.
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