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Dect technical information
DECT (Digital Enhanced Cordless Telecommunications) is a flexible digital radio access technology for cordless communications in residential, business and public environments. Designed for short-range use as an access mechanism to the main networks, DECT offers cordless voice, fax, high speed data and multimedia communications, wireless local area networks and wireless PBX. It thus has applications in the factory, office, home and public areas. For network operators DECT is also a cost-effective and flexible alternative to conventional cable/fibre connections into customers' premises, by providing "Wireless Local Loop".
Frequency bands have been made available for DECT in more than 100 countries worldwide. DECT services are compatible with GSM and ISDN and dual-mode DECT/GSM handsets are available. In a large number of countries DECT operates in a protected band, i.e. no interference from other technologies. ETSI DECT is one of the technologies the IMT-2000 specification.
The ETSI Project DECT is responsible for the development and maintenance of standards on this technology.
All DECT systems are based on a main standard that is the Common Interface (CI), which is often used in association with the Generic Access Profile (GAP). Built upon these base standards are a large number of Type Approval, Testing, Interworking and Data Services specifications produced up to now.
Achieved work
The DECT Project also finalized a number of interworking documents, DECT/ISDN, DECT/GSM, and recently DECT/UMTS interworking allowing the establishment of DECT as a cordless component for UMTS.
A recent important step for the development of DECT data application was the achievement of DECT Packet Radio Service (DPRS) introducing the flexibility and resources optimisation of packet technology, opening the field to further developments in terms of speed and profiles. The Project responds to the growing demand for the support of data services and the continuous desire to increase available data rates by adding high bit rate modes to DECT, current support of data applications up to more than 2 Mbit/s. Work on the third version of DPRS is ongoing. This supports the transmission of broadband data up to more than 10 Mbit/s.
In addition to this basic DPRS standards, a group of standards called Application Specific Access Profiles (ASAPs) has been also created. These are industry-driven standards intended to enhance interoperability. Each of them identifies a specific application scenario and selects a specific subset of DPRS services plus a voice service for particular applications.
DMAP (DECT Multimedia Access Profile), developed for residential/SOHO applications, allows design of low-cost domestic devices for local data interconnection and Internet connection via PSTN/ISDN. Ethernet (Eth) Interworking and V.24 Interworking were also published. These documents define data ASAP combining a selection of Ethernet and V.24 Interworking DPRS data services.
DECT standards can be reused in a general spectrum allocation band, and provide technical requirements to be applied for DECT approval in countries outside Europe which have a different spectrum allocation for DECT. A standard was created specifically for the use of the DECT radio access technology in the 2,45 GHz ISM Band.
DECT supports also mobile internet technology, specifying the additional requirements for DECT IP applications.
Future developments
Currently two working groups are active on DECT standardizations, one dealing with general aspects (DECT A) and the other with testing aspect (DECT 4). Apart from maintenance, current work centres on enhancing the system’s specifications, especially to cover high bit rates and multimedia applications.
Also scheduled for coming months is publication of the work on mobile Internet technology Specify the additional requirements for DECT IP applications including networking aspects, voice over IP, IPv6, mobility and quality of service properties
It is also scheduled for coming months a document on mobile Internet technology, (DTS/DECT-A0181) specifying the additional requirements for DECT IP applications including networking aspects, voice over IP, IPv6, mobility and quality of service properties.
Finally, discussions have been initiated with the 3GPP Project which has responsibility for UMTS, with a view to establishing DECT as a cordless component for UMTS. A multipart document TS 101 863 is currently under development, the first 3 part were published recently.
Further details can be found in TR 101 178 , an high level description and overview of the DECT standardization that does not require a detailed knowledge of DECT technology. the same overview for data services is in TR 102 185. This document also describes possible user scenarios in wireless mobile computing.
from: citaat
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