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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, 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 that require economical connection to a local communication medium with sporadic traffic at high-peak data rates. The entities that constitute the CSMA-CD module are listed below. The indentation indicates the hierarchical relationships between the entities. CSMA-CD Port Station The 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 CSMA-CD module adds features often needed by users of the Data Link. A typical such Data Link user is the Network Layer. The CSMA-CD entity is the top-level entity in the hierarchy of entities belonging to the CSMA-CD module.
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