The HDLC Port entity represents one end of an HDLC connection. The entity
   maintains information about that link. Ports are created and deleted
   automatically when a client of HDLC uses the link.

1  –  status

     CLIENT

         Name of the client using the port.

     LOGICAL STATION

         hdlc link logical station entity that the port is operating over.

     PROTOCOL ID

         Protocol ID that the port is using. For sequenced ports, this value
         is decided during negotiation. For unsequenced ports, the value is
         sent in every UI-frame.

     STATE

         State of the port.

         OPEN -          The port is assigned to a client. If the
                         communications line is unswitched, data transfer
                         can begin. For switched lines, an association must
                         be made with the line before data transfer can begin.

         OPEN DISABLED - The port is associated with a client, but the link
                         or logical station associated with it is disabled.

     TYPE

         Type of port.

         SEQUENCED -   The port can send and receive sequenced and
                       unsequenced data.

         UNSEQUENCED - The port can send and receive unsequenced data only.