DECT Specification / Standard

- a tabular overview of the main features of DECT technology.

The DECT cordless phone system has gain widespread acceptance. Many millions of DECT phones are in use around the world, its use spreading well beyond the boundaries of Europe where it was originally envisaged it would be used, and it is used in well over 100 countries around the globe.

The standard for DECT or Digital Enhanced Telecommunications system was developed by members of the European Telecommunications Standards Institute (ETSI).

The fact that DECT has an agreed standard has been a major element in its success. This has enabled it to be used across a large number of manufacturers, and it enables phones from one manufacturer to operate with equipment from another.

DECT standard salient features

This standard defines specification for the system and the way in which it operates. The salient features for DECT are defined below:

Parameter Specification
Frequency band 1880 MHz to 1900 MHz
Access technique MC/TDMA/TDD
Symbol rate 1152 k Symbol/s
Carrier spacing 1728 kHz
Frame duration 10 ms
Access channels/RF carrier 12 duplex 32 k bit/s channels
Traffic channels/single radio TRX 12
Traffic Channel assignment Instant dynamic
Control carriers Not required
Modulation GFSK (BT = 0,5) and optional higher level Modulation schemes possible
LO stability 25 ppm
Portable average RF power 10 mW
Portable peak RF power 240 mW 24 dBm
Speech codec 32 kbit/s ADPCM
Base Station sensitivity at 0,1 % BER -86 dBm (for GAP)
(typically -90 dBm to -94 dBm)
Basic link budget 110 dBm
(Typ.114 dBm to 118 dBm)
Protected 64 kbit/s bearer service Yes
Base station antenna Diversity Switched. Post detection selection optional
Dual antennas in handset Optional
Tolerance to time dispersion with selection antenna diversity 200 ns
(500 ns possible with low-cost non-coherent equalizer)

The DECT cordless phone system is now a well established standard that is widely used for domestic as well as business applications. With the extensions that are now available to the standard, it has become a very flexible system, and this is much of the reason for the success of the DECT cordless phone system.

By Ian Poole

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