DECT

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(Frequencies)
(Frequencies)
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*Carrier ID 9 - 1881.792 MHz (center frequency)
*Carrier ID 9 - 1881.792 MHz (center frequency)
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Rf-band number c number
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9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 -
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10 00001 11 00001 12 00001 13 00001 14 00001 15 00001 16 00001
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Carrier freq. MHz 1881,792 1883,520 1885,248 1886,876 1888,704 1890,432 1892,160 1893,888 1895,616 1897,344 1899,072 1900,800 1902,528 1904,256 1905,984 1907,712 1909,440
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Carrier number c 17
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Rf-band Carrier freq. number MHz
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00001 1911,168 00001 1912,896 00001 1914,624 00001 1916,352 00001 1918,080 00001 1919,808 00001 1921,536 00001 1923,264 00001 1924,992 00001 1926,720 00001 1928,448 00001 1930,176 00001 1931,904 00001 1933,632 00001 1935,360 00001 1937,088
[[Category: VHF/UHF Radio Services]]
[[Category: VHF/UHF Radio Services]]

Revision as of 20:17, 25 April 2021

Digital enhanced cordless telecommunications (Digital European cordless telecommunications),


Background

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.

Frequencies

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


European DECT channel plan:

  • Carrier ID 9 - 1881.792 MHz (center frequency)
Rf-band number c number

9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 - 10 00001 11 00001 12 00001 13 00001 14 00001 15 00001 16 00001 Carrier freq. MHz 1881,792 1883,520 1885,248 1886,876 1888,704 1890,432 1892,160 1893,888 1895,616 1897,344 1899,072 1900,800 1902,528 1904,256 1905,984 1907,712 1909,440 Carrier number c 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Rf-band Carrier freq. number MHz 00001 1911,168 00001 1912,896 00001 1914,624 00001 1916,352 00001 1918,080 00001 1919,808 00001 1921,536 00001 1923,264 00001 1924,992 00001 1926,720 00001 1928,448 00001 1930,176 00001 1931,904 00001 1933,632 00001 1935,360 00001 1937,088



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