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:
|Frequency band||1880 MHz to 1900 MHz|
|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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