The FDDI module implements one of multiple possible Link level/-
    Network level modules in the OSI layered architecture model.

    DNA Fiber Distributed Data Interface (FDDI) is the basis for
    the second generation of network interconnect architecture for
    Digital. The FDDI module implements one of the multiple possible
    Link level/Physical level modules in the OSI layered architecture
    model. The FDDI Physical level includes high speed, 125 megabaud,
    fiber optic links which may be many kilometers in length. The
    FDDI Link level provides a high bandwidth, 100 megabits per
    second local area network (LAN), and uses the ANSI standard FDDI
    Token Ring.

1  –  Subentities

    The entity hierarchy for the FDDI module is:

    Node___FDDI____Station____Link
                 |          |
                 |          |_PHY Port
                 |_Port

    The FDDI module incorporates the functions and operations
    defined in the ANSI FDDI Token Ring Media Access Control (MAC),
    the ANSI FDDI Token Ring Physical Layer Protocol (PHY), FDDI
    Physical Layer Medium Dependent (PMD), Station Management (SMT)
    specifications, parts of the ISO 8802-1 (IEEE 802.1) Addressing,
    Internetworking and Network Management, and parts of the ISO
    8802-2 (IEEE 802.2) Logical Link Control (LLC) specifications.

    The FDDI entity is the top-level entity in the hierarchy of
    entities belonging to the FDDI module.

    An FDDI STATION entity represents an access point to the service
    offered by the FDDI module. The FDDI data link can be monitored
    and controlled through DNA network management. The station-name
    refers to the station managed by this command.

    The FDDI STATION LINK entity is a subentity of the FDDI STATION
    entity. The fddi station link subentity provides the management
    view of LLC and the FDDI MAC. FDDI allows stations to be either
    single MAC or dual MAC and therefore there can be up to two link
    subentities for each station. In most cases, a station has at
    least one link entity. Concentrators may have no link entity and
    are not addressable on the FDDI, though they may be using other
    communications channels.

    An FDDI STATION PHY PORT entity provides the management view of
    the fddi station phy port and the fddi pmd. Each station has at
    least one phy port and a concentrator is a device that has at
    least one phy port of type M. A dual attached station or dual
    attached concentrator has a phy port type A and type B. A single
    attached station has a phy port of type B.

    An FDDI PORT entity represents an access point to the service
    offered by the FDDI module. A client transmits and receives data
    through a port. Ports are created and deleted by client use of
    open and close service interface procedures. The port-name refers
    to the port managed by this command.