Digital Enhanced Cordless Telecommunications


Digital Enhanced Cordless Telecommunications

(communications, standard)(DECT, formerly ".. European ..") Astandard developed by the European Telecommunication Standard Institute from 1988, governing pan-European digital mobile telephony. DECT covers wireless PBXs, telepoint,residential cordless telephones, wireless access to thepublic switched telephone network, Closed User Groups(CUGs), Local Area Networks, and wireless local loop.

DECT defines only the radio connection between two points andcan be used for remote access to public and private networks.Other mobility standards, such as GSM, TACS, and DCS 1800 add the necessary switching, signaling, and managementfunctions that are not specified by DECT.

The DECT Common Interface radio standard is a multicarriertime division multiple access, time division duplex(MC-TDMA-TDD) radio transmission technique using ten radio frequency channels from 1880 to 1930 MHz, each divided into24 time slots of 10ms, and twelve full-duplex accesses percarrier, for a total of 120 possible combinations.

A DECT base station (an RFP, Radio Fixed Part) can transmitall 12 possible accesses (time slots) simultaneously by usingdifferent frequencies or using only one frequency. Allsignaling information is transmitted from the RFP within amultiframe (16 frames). Voice signals are digitally encodedinto a 32 kbit/s signal using Adaptive Differential Pulse Code Modulation.

The handover process is requested autonomously by theportable terminal and the Radio Fixed Parts, according to thecarrier signal levels. A "Generic Access Profile" defines aminimum set of requirements for the support of speechtelephony.

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