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Тelecommunication system integration device buy in Hefei
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Тelecommunication system integration device

Тelecommunication system integration device

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A telecommunications device for the deaf (TDD) is a teleprinter, an electronic device for text communication over a telephone line, that is designed for use by persons with hearing or speech difficulties. Other names for the device include teletypewriter, TTY, textphone (common in Europe), and minicom (United Kingdom).

The typical TTD is a device about the size of a typewriter or laptop computer with a QWERTYkeyboard and small screen that uses LEDs or an LCD screen to display typed text electronically. In addition, TTDs commonly have a small spool of paper on which text is also printed — old versions of the device had only a printer and no screen. The text is transmitted live, via a telephone line, to a compatible device, i.e. one that uses a similar communication protocol.

Special telephone services have been developed to carry the TTD functionality even further. In certain countries there are systems in place so that a deaf person can communicate with a hearing person on an ordinary voice phone using a human relay operator. There are also "carry-over" services, enabling people who can hear but cannot speak ("hearing carry-over," a.k.a. "HCO"), or people who cannot hear but are able to speak ("voice carry-over," a.k.a. "VCO") to use the telephone.

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Тelecommunication system integration device
Тelecommunication system integration device
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