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GENERALCALL SERVER : MOBILITY
Ed. 04 1/4Réf. 3EH 21000 BSAA
File
GENERAL
ETSI STANDARD
The DECT protocol is based on pico-cellular technology (cells of 30 to 150 m depending on the envi-
ronment) allowing high traffic throughput: up to 10000 E/km2.
The frequency band used is between 1880 MHz and 1900 MHz (UHF) i.e. a passband of 20 MHz.
These 20 MHz are split into 10 radio channels.
The passband of a radio channel is 1.728 MHz and radio channels are spaced 2 MHz apart to avoid
interference between adjacent channels.
The DECT system is based on the use of FDMA (frequency multiplexing) and TDMA (time multiplexing)
techniques. It thus has a maximum capacity of 120 simultaneous communication channels (10 radio
frequencies x 12 time slots).
GAP (Generic Access Profile): part of the DECT protocol required for interworking by cordless handsets
from different manufacturers.
PRINCIPLES
The DECT features integrated into the Alcatel OmniPCX Office system allow for the creation of a wire-
less PABX.
The DECT features are offered by 4070 IO/EO base stations connected to UA Reflexes interfaces (UAI
boards).
A radio base station can support up to 6 communication channels simultaneously, on 2 UA links.
The base stations have a range of:
- 150 meters over open ground
- 30 to 50 meters horizontally and 7.5 meters vertically in an enclosed space
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