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VTN stands for Virtual Terminal Network, which refers to the network virtual terminal. VTN consists of two parts, namely: 1. Output device, usually a monitor, used to output remote data; 2. Input device, used for local data input.
Network Virtual Terminal (VTN), Virtual Terminal Network
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Composition:
Network virtual terminal VTN includes two parts:
Output device: output remote data, usually a monitor
Input device: local data input
Data format:
The data transmitted on the network virtual terminal VTN uses 8-bit byte data, of which
the highest bit is 0: general data
The byte with the highest bit being 1: used for VTN commands
At the beginning of communication, both communicating parties support a basic subset of VTN terminal features (can only distinguish what is data and what is a command), In order to communicate at the lowest level, on this basis, the two parties negotiate through VTN commands to determine the higher-level characteristics of VTN and realize the expansion of NVT functions.
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