Definitions[]
A TTY (also called a text telephone or teletypewriter) is
| “ | a text device that employs graphic communication in the transmission of coded signals through a wire or radio communication system.[1] | ” |
| “ | [m]achinery or equipment that employs interactive text based communications through the transmission of coded signals across the telephone network. TTYs may include, for example, devices known as TDDs (telecommunication display devices or telecommunication devices for deaf persons) or computers with special modems.[2] | ” |
| “ | [o]riginally an electromagnetic device consisting of a combined keyboard and printer used to communicate over telephone lines or other wired serial connections. The abbreviation TTY is now used to describe any serial teletypewriter-like connection.[3] | ” |