name: RR
full_form: Receive Ready (frame type)
context: Figure A.1: Relevant OSI model layers Figure A.1 shows the relevant OSI model layers and the communication paths between the primary and secondary device. The two important aspects of the OSI model are: - It defines a layered structure for the communication software; - It provides each layer with an apparent direct link to the same layer at the other device. However, in real life, the only actual message path between the two devices is through the physical connection between the two layer 1 entities. The layer 2 entities appear to communicate directly. In actual fact, a message passed from the first device to the second device takes the following path: - Layer 2 at the first device passes the message down to Layer 1; - Layer 1 transmits the message across the physical connection (for instance a wire) to layer 1 at the second device; - Layer 1 at the second device passes the message up to Layer 2 at the second device. Likewise, layer 7 entities appear to communicate directly. In actual
description: The Radio Regulations (RR) is a fundamental international regulatory text containing all decisions adopted by the World Radio Congress. It provides guidelines for various aspects of radio communication, including terminology, technical characteristics, and limits to spurious emissions.
explanation: RR is classified as a Specification because it is described as an international regulatory text that contains decisions and guidelines for radio communication. The mention of specific chapters, appendices, and articles within RR further supports its classification as a detailed specification document.
section_title: 4.3.1	ITU Radio Regulations
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