A school might also provide auxiliary aids and services such as computer-aided transcription services, assistive listening devices for auditorium-based lectures, closed captioned decoders, open and closed captioning, TDDs, and videotext displays.
Paul was a pioneer in development of TTD (telecommunications device for the deaf) which is also known as TTY.
Telecommunications device for the deaf, a device for text communication along a telephone line
The original standard used by TTYs is the Baudot code implemented asynchronously at either 45.5 or 50 baud, 1 start bit, 5 data bits, and 1.5 stop bits.
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As TDD's are increasingly considered legacy devices, with the emergence of modern technologies such as email, texting and instant messaging, text from TDD are increasingly being sent over Text over IP gateways, or other real-time text protocols.
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In order to be compatible with the existing TTY network, the MCM was designed around the five-bit Baudot code established by the older TTY machines instead of the ASCII code used by computers.
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A Phone of Our Own: the Deaf Insurrection Against Ma Bell. Washington, D.C.: Gallaudet University Press.
A parallel teletype service for hearing and speech impaired customers is available on 1800 637 500.
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