Americans with Disabilities Act (ADA) of 1990 (with amendments issued through 2008)

(a) Definitions

As used in this section

(1) Common carrier or carrier

The term "common carrier" or "carrier" includes any common carrier engaged in interstate communication by wire or radio as defined in section 153 of this title and any common carrier engaged in intrastate communication by wire or radio, notwithstanding sections 152(a) and 221(a) of this title.

(2) TDD

The term "TDD" means a Telecommunications Device for the Deaf which is a machine that employs graphic communication in the transmission of coded signals through a wire or radio communication system.

(3) Telecommunications relay services

The term "telecommunications relay services" means telephone transmission relay services that provide the ability for an individual who has a hearing impairment or speech impairment to engage in communication by wire or radio with a hearing individual in a manner that is functionally equivalent to the ability of an individual who does not have a hearing impairment or speech impairment to communicate using voice communication services by wire or radio. Such term includes services that enable two-way communication between an individual who uses a TDD or other nonvoice terminal device and an individual who does not use such a device.