Introduction.

Document Overview.

This document provides a prose description of the Data Link Layer design for the CEBus Network. The design is the standard currently adopted by the Electronics Industries Association (EIA). Although much of the material in this document is covered in two other CEBus documents, Node Medium Access Control Sublayer and Node Logical Link Control Sublayer, Description of the Node Data Link Layer serves a different purpose. The sublayer documents formally specify the design of the Medium Access Control and Logical Link Control Sublayers, but do not provide in-depth explanations and background information. Thus, the intent of this document is to be descriptive, rather than to provide a formal specification, and to complement the Node Medium Access Control Sublayer and Node Logical Link Control Sublayer specifications.

Description of the Node Data Link Layer begins with a discussion of the Data Link Layer interfaces to the Network Layer and Physical Layer. A functional description of the Data Link Layer presents the "frame", the Data Link Layer's fundamental message unit, and the scheme by which frames are exchanged in communication. The processes for assembling, transmitting, receiving, and disassembling frames are discussed in detail. In the final section, the functional division of the Data Link Layer into its sublayers, the Medium Access Control (MAC) Sublayer and the Logical Link Control (LLC) Sublayer, is described. This section is intended to be a preface to the formal MAC and LLC specification documents.

Although some of the functionality associated with the Physical Layer and the Network Layer is discussed, specification of those layers is not within the scope of this document.

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