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Telecommunications Devices for the Deaf

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ALSO CALLED: Telecommunications Display Devices, TTY, TDD
DEFINITION: A Telecommunications Display Device (TDD), also known as a text telephone, is atelephone equipped with a keyboard and a display for people who are hearing- orspeech-impaired. A TDD allows individuals to send and receive typed messagesusing its keyboard. Both home and public telephones can be equipped with a TDD. Public TDD pay phones have a keyboard drawer that slides out only after a call has been  … 

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