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Open Systems Interconnection (OSI) model standardizes communications functions as layers within a data communications system. Amateur digital radio systems often follow the OSI model in structure. What is the base layer of the OSI model involving the interconnection of a packet radio TNC to a computer terminal?
The physical layer
The Physical Layer (Layer 1) of the OSI model deals with the electrical, mechanical, and procedural interface to the transmission medium, such as the connection between a TNC (modem) and a computer via RS-232 or USB.
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