| DECT Specification Summary |
DECT Specification Summary
- 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). 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) |
DECT Summary
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.
|
