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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).
Real-time text is frequently used by the deaf, including IP-Relay services, TDD/TTY devices, and Text over IP.Real-time text allows the other person to read immediately, without waiting for the sender to finish composing his or her sentence/message.
A typical relay service conversation. A telecommunications relay service, also known as TRS, relay service, or IP-relay, or Web-based relay service, is an operator service that allows people who are deaf, hard of hearing, deafblind, or have a speech disorder to place calls to standard telephone users via a keyboard or assistive device.
True 3G systems such as EV-DO, W-CDMA (including HSPA and HSPA+) provide combined circuit switched and packet switched data and voice services from the outset, usually at far better data rates than 2G networks with their extensions. All of these services can be used to provide combined mobile voice access and Internet access at remote locations.
Interworking between TDDs and ToIP has been implemented using gateways by T-Meeting, Omnitor, Trace R& D, RNID, Center, Voiceriver, and AnnieS. RFC 5194 "Framework for real-time text over IP using the Session Initiation Protocol (SIP)" provides an overview of interworking issues. Work is being proposed in the IETF SIPPING work group on more ...
A packet-switched network transmits data that is divided into units called packets.A packet comprises a header (which describes the packet) and a payload (the data). The Internet is a packet-switched network, and most of the protocols in this list are designed for its protocol stack, the IP protocol suite.
The phrase TDD is not considered politically correct in the United States. This is because users with cognitive language impariments, among others, use the TTY devices as well. The article should be modified to use the phrases "TTY/TDD" and "Text Telephone" as a replacement for "TDD" and "Telecommunications device for the deaf" respectively.
Synchronous Data Link Control (SDLC) is a computer serial communications protocol first introduced by IBM as part of its Systems Network Architecture (SNA). SDLC is used as layer 2, the data link layer , in the SNA protocol stack .