Port denotes the physcial interface which can provide
Ethernet services. This object indicates the mode of the
port and its operational behaviour in the MEN.
'uni'
User Network Interface
The port resides on the interface between the end user
and the network. Additional information related
to the UNI is included in cevcUniTable.
'nni'
Network to Network Interface. The port resides on the
interface between two networks.