# Invariant Theory Old and New by Jean A. Dieudonne, J.B. Carrell

By Jean A. Dieudonne, J.B. Carrell

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Additional resources for Invariant Theory Old and New

Sample text

The CX media standard requires the installation of a pair of coaxial cables (equivalent to RG-6), branched from a central location to each room or area in the home. The standard classifies the media into two groups: wired and nonwired media. The wired media are PL, TP, and CX. The nonwired media are RF and IR. The different medium networks connect by devices called Routers and Brouters. A Router is a two-way CEBus device that connects any two wired media (PL to TP, PL to CX, or CX to TP). Messages that originate on one medium are routed to the other connected medium.

The CAL specification defines the message structure, syntax, and data structure necessary to model and control any consumer product operation. The description of CAL is divided into two separate parts. Part 1 defines the message structure, syntax, and capabilities of the language. Part 2 defines the major data structures, called Contexts, that define specific functions of consumer products. The most general Contexts are supplied as part of EIA-600. The remaining industry-specific Contexts (HVAC, security, lighting, and so on) are published as separate documents available from the CEBus Industry Council.

The CAL interpreter translates changes in the context data structure to an appropriate message to another node. Received messages are interpreted and the context data structure is updated accordingly. Formally, the CAL interpreter and its associated Context data structures are part of the protocol stack—the Application layer—but considering the interpreter as the protocol application is convenient because its function is unique to CEBus. The CEBus standard and this book treat the CEBus protocol as the Physical layer through the Message Transport sublayer.