Digital Enhanced Cordless Telecommunications

communications, standard (DECT, formerly ".. European ..") A

standard developed by the European TelecommunicationStandard Institute from 1988, governing pan-European digitalmobile telephony. DECT covers wireless PBXs, telepoint,

residential cordless telephones, wireless access to the

public switched telephone network, Closed User Groups

(CUGs), Local Area Networks, and wireless local loop.

DECT defines only the radio connection between two points and

can be used for remote access to public and private networks.

Other mobility standards, such as GSM, TACS, and DCS1800 add the necessary switching, signaling, and management

functions that are not specified by DECT.

The DECT Common Interface radio standard is a multicarrier

time division multiple access, time division duplex

(MC-TDMA-TDD) radio transmission technique using ten radiofrequency channels from 1880 to 1930 MHz, each divided into

24 time slots of 10ms, and twelve full-duplex accesses per

carrier, for a total of 120 possible combinations.

A DECT base station (an RFP, Radio Fixed Part) can transmit

all 12 possible accesses (time slots) simultaneously by using

different frequencies or using only one frequency. All

signaling information is transmitted from the RFP within a

multiframe (16 frames). Voice signals are digitally encoded

into a 32 kbit/s signal using Adaptive Differential PulseCode Modulation.

The handover process is requested autonomously by the

portable terminal and the Radio Fixed Parts, according to the

carrier signal levels. A "Generic Access Profile" defines a

minimum set of requirements for the support of speech

telephony.

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(1999-04-13)