The Token Ring module implements one of multiple possible Link
    level/Physical level modules in the OSI layered architecture model.

    The DNA IEEE 802.5/Token Ring Data Link provides either a
    4 or 16 Mbps local area network (LAN). It provides communication
    services for multiple concurrent users. The services provided are
    LLC, Mapped Ethernet and Station Management (SMT) services.

    The DNA IEEE 802.5/Token Ring module incorporates the
    functions and operations defined in the IEEE 802.5 Token Ring
    Access Method, 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.
    To this, the DNA 802.5/Token Ring Data Link adds features often
    needed by users of the data link. A typical such user is the
    Network Layer of the Digital Network Architecture (OSI).