Telecommunications device for the deaf, a device for text communication along a telephone line
TD-CDMA is used to multiplex streams from or to multiple transceivers.
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In Europe, CEPT allocated the 2010-2020 MHz range for a variant of UMTS-TDD designed for unlicensed, self-provided use.
In Use Case Driven Object Modeling with UML, Stephens outlines an extension to the ICONIX object modeling process which he and co-author Doug Rosenberg termed Design Driven Testing (DDT), a deliberate reversal of Test Driven Development (TDD), a core tenet of XP.
Together with TD-CDMA, it is also known as UMTS-TDD or IMT 2000 Time-Division (IMT-TD).
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.
Unlike TD-CDMA (UTRA-TDD 3.84 Mcps High Chip Rate, UTRA-TDD HCR) which complements W-CDMA (UTRA-FDD), it is suitable for both micro and macro cells.
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UMTS-TDD's air interfaces that use the TD-CDMA channel access technique are standardized as UTRA-TDD HCR, which uses increments of 5 MHz of spectrum, each slice divided into 10ms frames containing fifteen time slots (1500 per second).
UTRA-TDD HCR, an acronym for UMTS Terrestrial Radio Access(UTRA)-Time Division Duplex(TDD) High Chip Rate(HCR), is a 3GPP standardized channel access method based on a combination of TDMA and CDMA (known as TD-CDMA).