Definition

Telecommunications Display Device (TDD)

Contributor(s): Martha Pogue

A Telecommunications Display Device (TDD), also known as a text telephone, is a telephone equipped with a keyboard and a display for people who are hearing- or speech-impaired. A TDD allows individuals to send and receive typed messages using 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 placed to and answered from another TDD phone so that the keyboard is protected from vandalism or other damage.

This was last updated in September 2005

Continue Reading About Telecommunications Display Device (TDD)

Union Station in Seattle, WA briefly explains TDD on their Sound Transit site.

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