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What is a TTY Teletype Terminal?
A TTY teletype terminal, commonly referred to as a TTY terminal, is a communication device used to enable text-based communication between two or more individuals. It is a precursor to modern computer terminals and was widely used in the late 19th and early 20th centuries.
The TTY terminal consists of a keyboard for input and a printer-like mechanism to produce hard-copy output or display the text on a screen. It relies on telegraph or telephone lines to transmit the information from one terminal to another. Each TTY terminal is assigned a unique phone number, allowing users to dial and establish a connection.
At its core, a TTY terminal operates on the principle of converting text into electrical signals that can be sent over long distances. When a user enters text using the keyboard, the terminal encodes it into a series of electrical pulses and transmits them to the receiving terminal. The receiving terminal then decodes these electrical pulses back into readable text, either by printing it on paper or displaying it on a screen.
Basic Concepts of Computer Communication
To understand computer communication, it is crucial to familiarize ourselves with a few fundamental concepts. Here are three key concepts that form the basis of computer communication:
1. Protocol:
A protocol is a set of rules and guidelines that govern the exchange of information between two or more computing devices. It defines how data should be transmitted, formatted, and interpreted. Different protocols exist for different types of communication, such as the Transmission Control Protocol/Internet Protocol (TCP/IP) for the internet.
2. Data Transmission:
Data transmission refers to the process of sending data from one device to another. It involves converting data into electrical signals that can be transmitted over a communication medium, such as cables, fibers, or wireless connections. The data can be sent in different forms, including text, images, audio, or video.
3. Networking:
Networking refers to the interconnection of multiple computing devices to allow communication and resource-sharing between them. Networks can be local, involving devices within a limited geographic area, or global, as in the case of the internet. Networks can be wired (using physical cables) or wireless (relying on radio waves or infrared signals).
These concepts provide a foundation for understanding the complex world of computer communication. The evolution of technology has led to significant advancements in communication, eventually rendering the TTY terminals obsolete. Nonetheless, they hold a significant place in the history of computer communication, serving as a stepping stone towards modern communication technologies.
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