A Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
    Local Area Network (LAN) provides high-speed communications channels
    for connecting computers and other digital devices located within a
    moderate-sized geographic area. Like other LANs, the CSMA/CD LAN
    falls between long-distance, low-speed networks that carry data
    for hundreds or thousands of kilometers, and specialized, very
    high-speed intercommunications that are generally limited to tens
    of meters. The CSMA/CD LAN is intended primarily for use in such
    areas as office automation, distributed data processing, terminal
    access, distributed systems and other situations requiring
    economical connection to a local communication medium carrying
    sporadic traffic at high-peak data rates.

    For Tru64 UNIX, the DNA CSMA/CD module incorporates the functions
    and operations defined in the Ethernet Specification V2.0 and the
    ISO 8802-3 (IEEE 802.3) CSMA/CD Access Method and Physical Layer
    specification as well as parts of the ISO 8802-1 (IEEE 802.1)
    Addressing, Internetworking, and Network Management and the ISO
    8802-2 (IEEE 802.2) Logical Link Control specifications. To this
    the DNA CSMA-CD module adds features often needed by users of the
    Data Link. A typical such Data Link user is the Network Layer of
    the DNA.

1  –  Subentities

    The subentities below the CSMA-CD module are:

    Node___CSMA-CD____Port
                    |
                    |_Station

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

    A CSMA-CD PORT entity represents an access point to the service
    offered by the CSMA-CD 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.

    A CSMA-CD STATION entity manages a CSMA/CD controller. Wherever
    Phase IV DECnet manages a line, DECnet-Plus manages a station.
    Each station corresponds to a particular logical link control
    (LLC), medium access control (MAC), and physical attachment. The
    station-name refers to the station managed by this command.