This object reports the physical port number of an FDDI port entry, serving as the table's index (the source DESCRIPTION text is copied from the ATM LEC port object but the FDDI-specific placement of this object makes clear it identifies the FDDI port itself). An admin uses it to identify which physical FDDI port a given row's SMT index and other FDDI-specific data applies to. It ties this table's rows back to the device's standard port numbering.