Definition - TTY - May 30 Draft
May 30 Draft > Working Copy of Definition - TTY
- Subcommittee: Subpart A
- Section: Subpart A: Definitions
Current Draft (for reference only)
An abbreviation for teletypewriter. Machinery or equipment that employs interactive text based communications through the transmission of coded signals across the telephone network. As used in this part, the term TTY includes text-to-text communications along with voice and text intermixed communications such as voice carry over and hearing carry over. TTYs may include, for example, devices known as TDDs (telecommunication display devices or telecommunication devices for deaf persons) or computers with special modems. TTYs are also called text telephones.
Comments or suggested edits
An abbreviation for teletypewriter. Machinery or equipment that enables interactive text based communications through the transmission of frequency-shift-keying audio tones across the telephone network. As used in this part, the term TTY includes text-to-text communications along with voice and text intermixed communications such as voice carry over and hearing carry over. TTYs may include, for example, devices known as TDDs (telecommunication display devices or telecommunication devices for deaf persons) or computers with special modems. TTYs are also called text telephones.
Discussion or Rationale
1. It's TTY that first made text-based communication possible, it didn't "employ" text-based communication.
2. A mention of FSK "audio tones" is added because a major source of incompatibility with cellular technology has been that continuous audio tones are used to transmit the information, consuming any idle channel time that might otherwise be allocated to other users.
