Digital enhanced cordless telecommunications (Digital European cordless telecommunications)
Originally designed as a cordless telephone standard to replace the half dozen different analog and digital cordless telephone technologies operating on various frequency bands from 1.6-1.7 MHz to 30-50 MHz (31 MHz in the UK, 43-50 MHz in the US) and UHF/SHF bands such as 890 MHz, 900 MHz band (902-928 MHz), the 2.4 GHz band 5 GHz band and 5.8 GHz bands among many others.
DECT Theory & Details Communication Typical Frequency Range is 1700-1940 MHz or 1.7 GHz to 1.94 GHz, usually simply referred to as 1.9 GHz band. General: Digital enhanced cordless telecommunications Modulation: TDMA, GMSK, GFSK Combination method. DECT uses MC (multi carrier): 10 RF channels; channel 10 at 1881.792 MHz; other channel numbers in decreasing order at 1.782 MHz intervals. DECT uses TDMA (time division multiple access) within a channel: 24 timeslots spaced 10 ms apart; 1 – 12 downlink, 13 – 24 uplink. DECT devices automatically look for the carrier that gives the best transmission quality (dynamic channel selection / allocation). DECT uses TDD (time division duplex) In full duplex mode for teleph-ony in 2 channels always separated by 5 ms and also on different frequencies. The bursts are GMSK or GFSK modulated (Gaussian minimum shift keying; Gaussian frequency shift keying). Up to 23 channels can be bundled for data transmissions. At least one channel must remain for the backward path
usually known by the acronym DECT, is a standard primarily used for creating cordless telephone systems. It originated in Europe and is now used worldwide (with frequency allocations differing from country to country...however, there are significant efforts at standardization as with LPD or Part 15 devices in the EU (CEPT), etc.
DECT bands DECT frequency bands DECT channels
Full coverage usually considered 1770 MHz to 1939 MHz with obvious gaps depending on country allocation. Usually the 1.9 GHz band.
Channel spacing is usually 1.728 MHz, with some exceptions and offsets. Power limits, duty cycle limitations and ERP/EIRP limits also vary from country to country.
- 1920 MHz - 1930 MHz - United States and Canada - DECT 6.0
- 1910 MHz - 1930 MHz - Latin America (excluding Brazil)
- 1910 MHz - 1920 MHz - Brazil
- 1893 MHz - 1906 MHz - Japan - J-DECT specification
- 1786 MHz - 1792 MHz - South Korea
- 1880 MHz - 1900 MHz - Europe, most of Asia and numerous other countries - DECT-2020
DECT channel plan:
- Carrier ID 9 - 1881.792 MHz (center frequency)
- 1883.592 MHz
- 1885.248 MHz
- 1886.876 MHz
- 1937.088 MHz
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